interface_widgets.cc

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/* SPDX-FileCopyrightText: 2009 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include <algorithm>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <list>
 
#include "DNA_brush_types.h"
#include "DNA_node_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_userdef_types.h"
 
#include "BLI_color.hh"
#include "BLI_listbase.h"
#include "BLI_math_color.h"
#include "BLI_math_vector.h"
#include "BLI_rect.h"
#include "BLI_string.h"
#include "BLI_string_utf8.h"
#include "BLI_utildefines.h"
 
#include "BKE_context.hh"
 
#include "RNA_access.hh"
 
#include "BLF_api.hh"
 
#include "ED_node.hh"
 
#include "UI_interface_icons.hh"
#include "UI_view2d.hh"
 
#include "interface_intern.hh"
 
#include "GPU_batch.hh"
#include "GPU_batch_presets.hh"
#include "GPU_immediate.hh"
#include "GPU_immediate_util.hh"
#include "GPU_matrix.hh"
#include "GPU_state.hh"
 
#include "UI_abstract_view.hh"
 
#include "IMB_colormanagement.hh"
 
#ifdef WITH_INPUT_IME
#  include "WM_types.hh"
#endif
 
/* -------------------------------------------------------------------- */
 
/* icons are 80% of height of button (16 pixels inside 20 height) */
#define ICON_SIZE_FROM_BUTRECT(rect) (0.8f * BLI_rcti_size_y(rect))
 
/* visual types for drawing */
/* for time being separated from functional types */
enum uiWidgetTypeEnum {
  /* default */
  UI_WTYPE_REGULAR,
 
  /* standard set */
  UI_WTYPE_LABEL,
  UI_WTYPE_TOGGLE,
  UI_WTYPE_CHECKBOX,
  UI_WTYPE_RADIO,
  UI_WTYPE_NUMBER,
  UI_WTYPE_SLIDER,
  UI_WTYPE_EXEC,
  UI_WTYPE_TOOLBAR_ITEM,
  UI_WTYPE_TAB,
  UI_WTYPE_TOOLTIP,
 
  /* strings */
  UI_WTYPE_NAME,
  UI_WTYPE_NAME_LINK,
  UI_WTYPE_POINTER_LINK,
  UI_WTYPE_FILENAME,
 
  /* menus */
  UI_WTYPE_MENU_RADIO,
  UI_WTYPE_MENU_ICON_RADIO,
  UI_WTYPE_MENU_POINTER_LINK,
  UI_WTYPE_MENU_NODE_LINK,
 
  UI_WTYPE_PULLDOWN,
  UI_WTYPE_MENU_ITEM,
  /* Same as #UI_WTYPE_MENU_ITEM, but doesn't add padding to sides for text & icon inside the
   * widget. To be used when multiple menu items should be displayed close to each other
   * horizontally. */
  UI_WTYPE_MENU_ITEM_UNPADDED,
  UI_WTYPE_MENU_ITEM_PIE,
  UI_WTYPE_MENU_BACK,
 
  /* specials */
  UI_WTYPE_ICON,
  UI_WTYPE_ICON_LABEL,
  UI_WTYPE_PREVIEW_TILE,
  UI_WTYPE_SWATCH,
  UI_WTYPE_RGB_PICKER,
  UI_WTYPE_UNITVEC,
  UI_WTYPE_BOX,
  UI_WTYPE_SCROLL,
  UI_WTYPE_LISTITEM,
  UI_WTYPE_PROGRESS,
  UI_WTYPE_NODESOCKET,
  UI_WTYPE_VIEW_ITEM,
};

struct uiWidgetStateInfo {
  int but_flag;
  int but_drawflag;
  blender::ui::EmbossType emboss;

  bool has_hold_action : 1;
  bool is_text_input : 1;
};
 
static const uiWidgetStateInfo STATE_INFO_NULL = {0};

 
/* -------------------------------------------------------------------- */
 
static void color_blend_v3_v3(uchar cp[3], const uchar cpstate[3], const float fac)
{
  if (fac != 0.0f) {
    cp[0] = int((1.0f - fac) * cp[0] + fac * cpstate[0]);
    cp[1] = int((1.0f - fac) * cp[1] + fac * cpstate[1]);
    cp[2] = int((1.0f - fac) * cp[2] + fac * cpstate[2]);
  }
}
 
static void color_blend_v4_v4v4(uchar r_col[4],
                                const uchar col1[4],
                                const uchar col2[4],
                                const float fac)
{
  const int faci = unit_float_to_uchar_clamp(fac);
  const int facm = 255 - faci;
 
  r_col[0] = (faci * col1[0] + facm * col2[0]) / 256;
  r_col[1] = (faci * col1[1] + facm * col2[1]) / 256;
  r_col[2] = (faci * col1[2] + facm * col2[2]) / 256;
  r_col[3] = (faci * col1[3] + facm * col2[3]) / 256;
}
 
static void color_ensure_contrast_v3(uchar cp[3], const uchar cp_other[3], int contrast)
{
  BLI_assert(contrast > 0);
  const int item_value = srgb_to_grayscale_byte(cp);
  const int inner_value = srgb_to_grayscale_byte(cp_other);
  const int delta = item_value - inner_value;
  if (delta >= 0) {
    if (contrast > delta) {
      add_v3_uchar_clamped(cp, contrast - delta);
    }
  }
  else {
    if (contrast > -delta) {
      add_v3_uchar_clamped(cp, -contrast - delta);
    }
  }
}
 
static void color_mul_hsl_v3(uchar ch[3], float h_factor, float s_factor, float l_factor)
{
  float rgb[3], hsl[3];
  rgb_uchar_to_float(rgb, ch);
  rgb_to_hsl_v(rgb, hsl);
  hsl[0] *= h_factor;
  hsl[1] *= s_factor;
  hsl[2] *= l_factor;
  hsl_to_rgb_v(hsl, rgb);
  rgb_float_to_uchar(ch, rgb);
}

 
/* -------------------------------------------------------------------- */

 
/* fill this struct with polygon info to draw AA'ed */
/* it has outline, back, and two optional tria meshes */
 
struct uiWidgetTrias {
  uint tot;
  int type;
  float size, center[2];
 
  float vec[16][2];
  const uint (*index)[3];
};
 
/* max as used by round_box__edges */
/* Make sure to change widget_base_vert.glsl accordingly. */
#define WIDGET_CURVE_RESOLU 9
#define WIDGET_SIZE_MAX (WIDGET_CURVE_RESOLU * 4)
 
struct uiWidgetBase {
  /* TODO: remove these completely. */
  int totvert, halfwayvert;
  float outer_v[WIDGET_SIZE_MAX][2];
  float inner_v[WIDGET_SIZE_MAX][2];
  float inner_uv[WIDGET_SIZE_MAX][2];
 
  bool draw_inner, draw_outline, draw_emboss;
 
  uiWidgetTrias tria1;
  uiWidgetTrias tria2;
 
  /* Widget shader parameters, must match the shader layout. */
  uiWidgetBaseParameters uniform_params;
};

struct uiWidgetType {
 
  /* pointer to theme color definition */
  const uiWidgetColors *wcol_theme;
  uiWidgetStateColors *wcol_state;
 
  /* converted colors for state */
  uiWidgetColors wcol;
 
  void (*state)(uiWidgetType *, const uiWidgetStateInfo *state, blender::ui::EmbossType emboss)
      ATTR_NONNULL();
  void (*draw)(uiWidgetColors *,
               rcti *,
               const uiWidgetStateInfo *,
               int roundboxalign,
               const float zoom) ATTR_NONNULL();
  void (*custom)(uiBut *,
                 uiWidgetColors *,
                 rcti *,
                 const uiWidgetStateInfo *,
                 int roundboxalign,
                 const float zoom) ATTR_NONNULL();
  void (*draw_block)(
      uiWidgetColors *, const rcti *, int block_flag, int roundboxalign, const float zoom);
  void (*text)(const uiFontStyle *, const uiWidgetColors *, uiBut *, rcti *);
};

 
/* -------------------------------------------------------------------- */
 
static const float cornervec[WIDGET_CURVE_RESOLU][2] = {
    {0.0, 0.0},
    {0.195, 0.02},
    {0.383, 0.067},
    {0.55, 0.169},
    {0.707, 0.293},
    {0.831, 0.45},
    {0.924, 0.617},
    {0.98, 0.805},
    {1.0, 1.0},
};
 
const float ui_pixel_jitter[UI_PIXEL_AA_JITTER][2] = {
    {0.468813, -0.481430},
    {-0.155755, -0.352820},
    {0.219306, -0.238501},
    {-0.393286, -0.110949},
    {-0.024699, 0.013908},
    {0.343805, 0.147431},
    {-0.272855, 0.269918},
    {0.095909, 0.388710},
};
#define WIDGET_AA_JITTER UI_PIXEL_AA_JITTER
#define jit ui_pixel_jitter
 
static const float g_shape_preset_number_arrow_vert[3][2] = {
    {-0.352077, 0.532607},
    {-0.352077, -0.549313},
    {0.330000, -0.008353},
};
static const uint g_shape_preset_number_arrow_face[1][3] = {
    {0, 1, 2},
};
 
static const float g_shape_preset_scroll_circle_vert[16][2] = {
    {0.382684, 0.923879},
    {0.000001, 1.000000},
    {-0.382683, 0.923880},
    {-0.707107, 0.707107},
    {-0.923879, 0.382684},
    {-1.000000, 0.000000},
    {-0.923880, -0.382684},
    {-0.707107, -0.707107},
    {-0.382683, -0.923880},
    {0.000000, -1.000000},
    {0.382684, -0.923880},
    {0.707107, -0.707107},
    {0.923880, -0.382684},
    {1.000000, -0.000000},
    {0.923880, 0.382683},
    {0.707107, 0.707107},
};
static const uint g_shape_preset_scroll_circle_face[14][3] = {
    {0, 1, 2},
    {2, 0, 3},
    {3, 0, 15},
    {3, 15, 4},
    {4, 15, 14},
    {4, 14, 5},
    {5, 14, 13},
    {5, 13, 6},
    {6, 13, 12},
    {6, 12, 7},
    {7, 12, 11},
    {7, 11, 8},
    {8, 11, 10},
    {8, 10, 9},
};
 
static const float g_shape_preset_menu_arrow_vert[6][2] = {
    {-0.33, 0.16},
    {0.33, 0.16},
    {0, 0.82},
    {0, -0.82},
    {-0.33, -0.16},
    {0.33, -0.16},
};
static const uint g_shape_preset_menu_arrow_face[2][3] = {{2, 0, 1}, {3, 5, 4}};
 
static const float g_shape_preset_checkmark_vert[6][2] = {
    {-0.578579, 0.253369},
    {-0.392773, 0.412794},
    {-0.004241, -0.328551},
    {-0.003001, 0.034320},
    {1.055313, 0.864744},
    {0.866408, 1.026895},
};
 
static const uint g_shape_preset_checkmark_face[4][3] = {
    {3, 2, 4},
    {3, 4, 5},
    {1, 0, 3},
    {0, 2, 3},
};
 
#define OY (-0.2 / 2)
#define SC (0.35 * 2)
static const float g_shape_preset_hold_action_vert[6][2] = {
    {-0.5 + SC, 1.0 + OY},
    {0.5, 1.0 + OY},
    {0.5, 0.0 + OY + SC},
};
static const uint g_shape_preset_hold_action_face[2][3] = {{2, 0, 1}, {3, 5, 4}};
#undef OY
#undef SC

 
/* -------------------------------------------------------------------- */
 
static struct {
  blender::gpu::Batch *roundbox_widget;
  blender::gpu::Batch *roundbox_shadow;
 
  /* TODO: remove. */
  GPUVertFormat format;
  uint vflag_id;
} g_ui_batch_cache = {nullptr};
 
static const GPUVertFormat &vflag_format()
{
  if (g_ui_batch_cache.format.attr_len == 0) {
    GPUVertFormat *format = &g_ui_batch_cache.format;
    g_ui_batch_cache.vflag_id = GPU_vertformat_attr_add(
        format, "vflag", blender::gpu::VertAttrType::UINT_32);
  }
  return g_ui_batch_cache.format;
}
 
#define INNER 0
#define OUTLINE 1
#define EMBOSS 2
#define NO_AA 0
 
static void set_roundbox_vertex_data(GPUVertBufRaw *vflag_step, uint32_t d)
{
  uint32_t *data = static_cast<uint32_t *>(GPU_vertbuf_raw_step(vflag_step));
  *data = d;
}
 
static uint32_t set_roundbox_vertex(GPUVertBufRaw *vflag_step,
                                    int corner_id,
                                    int corner_v,
                                    int jit_v,
                                    bool inner,
                                    bool emboss,
                                    int color)
{
  uint32_t *data = static_cast<uint32_t *>(GPU_vertbuf_raw_step(vflag_step));
  *data = corner_id;
  *data |= corner_v << 2;
  *data |= jit_v << 6;
  *data |= color << 12;
  *data |= (inner) ? (1 << 10) : 0;  /* is inner vert */
  *data |= (emboss) ? (1 << 11) : 0; /* is emboss vert */
  return *data;
}
 
blender::gpu::Batch *ui_batch_roundbox_widget_get()
{
  if (g_ui_batch_cache.roundbox_widget == nullptr) {
    blender::gpu::VertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
 
    GPU_vertbuf_data_alloc(*vbo, 12);
 
    GPUIndexBufBuilder ibuf;
    GPU_indexbuf_init(&ibuf, GPU_PRIM_TRIS, 6, 12);
    /* Widget */
    GPU_indexbuf_add_tri_verts(&ibuf, 0, 1, 2);
    GPU_indexbuf_add_tri_verts(&ibuf, 2, 1, 3);
    /* Trias */
    GPU_indexbuf_add_tri_verts(&ibuf, 4, 5, 6);
    GPU_indexbuf_add_tri_verts(&ibuf, 6, 5, 7);
 
    GPU_indexbuf_add_tri_verts(&ibuf, 8, 9, 10);
    GPU_indexbuf_add_tri_verts(&ibuf, 10, 9, 11);
 
    g_ui_batch_cache.roundbox_widget = GPU_batch_create_ex(
        GPU_PRIM_TRIS, vbo, GPU_indexbuf_build(&ibuf), GPU_BATCH_OWNS_INDEX | GPU_BATCH_OWNS_VBO);
    gpu_batch_presets_register(g_ui_batch_cache.roundbox_widget);
  }
  return g_ui_batch_cache.roundbox_widget;
}
 
blender::gpu::Batch *ui_batch_roundbox_shadow_get()
{
  if (g_ui_batch_cache.roundbox_shadow == nullptr) {
    uint32_t last_data;
    GPUVertBufRaw vflag_step;
    blender::gpu::VertBuf *vbo = GPU_vertbuf_create_with_format(vflag_format());
    const int vcount = (WIDGET_SIZE_MAX + 1) * 2 + 2 + WIDGET_SIZE_MAX;
    GPU_vertbuf_data_alloc(*vbo, vcount);
    GPU_vertbuf_attr_get_raw_data(vbo, g_ui_batch_cache.vflag_id, &vflag_step);
 
    for (int c = 0; c < 4; c++) {
      for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
        set_roundbox_vertex(&vflag_step, c, a, NO_AA, true, false, INNER);
        set_roundbox_vertex(&vflag_step, c, a, NO_AA, false, false, INNER);
      }
    }
    /* close loop */
    last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
    last_data = set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, false, false, INNER);
    /* restart */
    set_roundbox_vertex_data(&vflag_step, last_data);
    set_roundbox_vertex(&vflag_step, 0, 0, NO_AA, true, false, INNER);
    /* filled */
    for (int c1 = 0, c2 = 3; c1 < 2; c1++, c2--) {
      for (int a1 = 0, a2 = WIDGET_CURVE_RESOLU - 1; a2 >= 0; a1++, a2--) {
        set_roundbox_vertex(&vflag_step, c1, a1, NO_AA, true, false, INNER);
        set_roundbox_vertex(&vflag_step, c2, a2, NO_AA, true, false, INNER);
      }
    }
    g_ui_batch_cache.roundbox_shadow = GPU_batch_create_ex(
        GPU_PRIM_TRI_STRIP, vbo, nullptr, GPU_BATCH_OWNS_VBO);
    gpu_batch_presets_register(g_ui_batch_cache.roundbox_shadow);
  }
  return g_ui_batch_cache.roundbox_shadow;
}
 
#undef INNER
#undef OUTLINE
#undef EMBOSS
#undef NO_AA

 
/* -------------------------------------------------------------------- */
 
static void draw_anti_tria(
    float x1, float y1, float x2, float y2, float x3, float y3, const float color[4])
{
  const float tri_arr[3][2] = {{x1, y1}, {x2, y2}, {x3, y3}};
 
  float draw_color[4];
  copy_v4_v4(draw_color, color);
  /* NOTE: This won't give back the original color. */
  draw_color[3] *= 1.0f / WIDGET_AA_JITTER;
 
  GPU_blend(GPU_BLEND_ALPHA);
 
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
  immUniformColor4fv(draw_color);
  immBegin(GPU_PRIM_TRIS, 3 * WIDGET_AA_JITTER);
 
  /* for each AA step */
  for (int j = 0; j < WIDGET_AA_JITTER; j++) {
    immVertex2f(pos, tri_arr[0][0] + jit[j][0], tri_arr[0][1] + jit[j][1]);
    immVertex2f(pos, tri_arr[1][0] + jit[j][0], tri_arr[1][1] + jit[j][1]);
    immVertex2f(pos, tri_arr[2][0] + jit[j][0], tri_arr[2][1] + jit[j][1]);
  }
 
  immEnd();
 
  immUnbindProgram();
 
  GPU_blend(GPU_BLEND_NONE);
}
 
void UI_draw_icon_tri(float x, float y, char dir, const float color[4])
{
  const float f3 = 0.05 * U.widget_unit;
  const float f5 = 0.15 * U.widget_unit;
  const float f7 = 0.25 * U.widget_unit;
 
  if (dir == 'h') {
    draw_anti_tria(x - f3, y - f5, x - f3, y + f5, x + f7, y, color);
  }
  else if (dir == 't') {
    draw_anti_tria(x - f5, y - f7, x + f5, y - f7, x, y + f3, color);
  }
  else { /* 'v' = vertical, down. */
    draw_anti_tria(x - f5, y + f3, x + f5, y + f3, x, y - f7, color);
  }
}
 
/* triangle 'icon' inside rect */
static void draw_anti_tria_rect(const rctf *rect, char dir, const float color[4])
{
  if (dir == 'h') {
    const float half = 0.5f * BLI_rctf_size_y(rect);
    draw_anti_tria(
        rect->xmin, rect->ymin, rect->xmin, rect->ymax, rect->xmax, rect->ymin + half, color);
  }
  else {
    const float half = 0.5f * BLI_rctf_size_x(rect);
    draw_anti_tria(
        rect->xmin, rect->ymax, rect->xmax, rect->ymax, rect->xmin + half, rect->ymin, color);
  }
}
 
static void widget_init(uiWidgetBase *wtb)
{
  wtb->totvert = wtb->halfwayvert = 0;
  wtb->tria1.tot = 0;
  wtb->tria2.tot = 0;
  wtb->tria1.type = ROUNDBOX_TRIA_NONE;
  wtb->tria1.size = 0;
  wtb->tria2.size = 0;
 
  wtb->draw_inner = true;
  wtb->draw_outline = true;
  wtb->draw_emboss = true;
 
  wtb->uniform_params.shade_dir = 1.0f;
  wtb->uniform_params.alpha_discard = 1.0f;
}

 
/* -------------------------------------------------------------------- */
 
/* this call has 1 extra arg to allow mask outline */
static void round_box__edges(
    uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad, float radi)
{
  float vec[WIDGET_CURVE_RESOLU][2], veci[WIDGET_CURVE_RESOLU][2];
  const float minx = rect->xmin, miny = rect->ymin, maxx = rect->xmax, maxy = rect->ymax;
  const float minxi = minx + U.pixelsize; /* Bounding-box inner. */
  const float maxxi = maxx - U.pixelsize;
  const float minyi = miny + U.pixelsize;
  const float maxyi = maxy - U.pixelsize;
  /* for uv, can divide by zero */
  const float facxi = (maxxi != minxi) ? 1.0f / (maxxi - minxi) : 0.0f;
  const float facyi = (maxyi != minyi) ? 1.0f / (maxyi - minyi) : 0.0f;
  int tot = 0;
  const int hnum = ((roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT)) ==
                        (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT) ||
                    (roundboxalign & (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) ==
                        (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT)) ?
                       1 :
                       2;
  const int vnum = ((roundboxalign & (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT)) ==
                        (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT) ||
                    (roundboxalign & (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) ==
                        (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT)) ?
                       1 :
                       2;
 
  const int minsize = min_ii(BLI_rcti_size_x(rect) * hnum, BLI_rcti_size_y(rect) * vnum);
 
  if (2.0f * rad > minsize) {
    rad = 0.5f * minsize;
  }
 
  if (2.0f * (radi + 1.0f) > minsize) {
    radi = 0.5f * minsize - U.pixelsize;
  }
 
  wt->uniform_params.rad = rad;
  wt->uniform_params.radi = radi;
  wt->uniform_params.facxi = facxi;
  wt->uniform_params.facyi = facyi;
  wt->uniform_params.round_corners[0] = (roundboxalign & UI_CNR_BOTTOM_LEFT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[1] = (roundboxalign & UI_CNR_BOTTOM_RIGHT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[2] = (roundboxalign & UI_CNR_TOP_RIGHT) ? 1.0f : 0.0f;
  wt->uniform_params.round_corners[3] = (roundboxalign & UI_CNR_TOP_LEFT) ? 1.0f : 0.0f;
  BLI_rctf_rcti_copy(&wt->uniform_params.rect, rect);
  BLI_rctf_init(&wt->uniform_params.recti, minxi, maxxi, minyi, maxyi);
 
  /* Multiply by radius. */
  for (int a = 0; a < WIDGET_CURVE_RESOLU; a++) {
    veci[a][0] = radi * cornervec[a][0];
    veci[a][1] = radi * cornervec[a][1];
    vec[a][0] = rad * cornervec[a][0];
    vec[a][1] = rad * cornervec[a][1];
  }
 
  /* corner left-bottom */
  if (roundboxalign & UI_CNR_BOTTOM_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = minxi + veci[a][1];
      wt->inner_v[tot][1] = minyi + radi - veci[a][0];
 
      wt->outer_v[tot][0] = minx + vec[a][1];
      wt->outer_v[tot][1] = miny + rad - vec[a][0];
 
      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = minxi;
    wt->inner_v[tot][1] = minyi;
 
    wt->outer_v[tot][0] = minx;
    wt->outer_v[tot][1] = miny;
 
    wt->inner_uv[tot][0] = 0.0f;
    wt->inner_uv[tot][1] = 0.0f;
 
    tot++;
  }
 
  /* corner right-bottom */
  if (roundboxalign & UI_CNR_BOTTOM_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = maxxi - radi + veci[a][0];
      wt->inner_v[tot][1] = minyi + veci[a][1];
 
      wt->outer_v[tot][0] = maxx - rad + vec[a][0];
      wt->outer_v[tot][1] = miny + vec[a][1];
 
      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = maxxi;
    wt->inner_v[tot][1] = minyi;
 
    wt->outer_v[tot][0] = maxx;
    wt->outer_v[tot][1] = miny;
 
    wt->inner_uv[tot][0] = 1.0f;
    wt->inner_uv[tot][1] = 0.0f;
 
    tot++;
  }
 
  wt->halfwayvert = tot;
 
  /* corner right-top */
  if (roundboxalign & UI_CNR_TOP_RIGHT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = maxxi - veci[a][1];
      wt->inner_v[tot][1] = maxyi - radi + veci[a][0];
 
      wt->outer_v[tot][0] = maxx - vec[a][1];
      wt->outer_v[tot][1] = maxy - rad + vec[a][0];
 
      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = maxxi;
    wt->inner_v[tot][1] = maxyi;
 
    wt->outer_v[tot][0] = maxx;
    wt->outer_v[tot][1] = maxy;
 
    wt->inner_uv[tot][0] = 1.0f;
    wt->inner_uv[tot][1] = 1.0f;
 
    tot++;
  }
 
  /* corner left-top */
  if (roundboxalign & UI_CNR_TOP_LEFT) {
    for (int a = 0; a < WIDGET_CURVE_RESOLU; a++, tot++) {
      wt->inner_v[tot][0] = minxi + radi - veci[a][0];
      wt->inner_v[tot][1] = maxyi - veci[a][1];
 
      wt->outer_v[tot][0] = minx + rad - vec[a][0];
      wt->outer_v[tot][1] = maxy - vec[a][1];
 
      wt->inner_uv[tot][0] = facxi * (wt->inner_v[tot][0] - minxi);
      wt->inner_uv[tot][1] = facyi * (wt->inner_v[tot][1] - minyi);
    }
  }
  else {
    wt->inner_v[tot][0] = minxi;
    wt->inner_v[tot][1] = maxyi;
 
    wt->outer_v[tot][0] = minx;
    wt->outer_v[tot][1] = maxy;
 
    wt->inner_uv[tot][0] = 0.0f;
    wt->inner_uv[tot][1] = 1.0f;
 
    tot++;
  }
 
  BLI_assert(tot <= WIDGET_SIZE_MAX);
 
  wt->totvert = tot;
}
 
static void round_box_edges(uiWidgetBase *wt, int roundboxalign, const rcti *rect, float rad)
{
  round_box__edges(wt, roundboxalign, rect, rad, rad - U.pixelsize);
}

 
/* -------------------------------------------------------------------- */
 
/* based on button rect, return scaled array of triangles */
static void shape_preset_init_trias_ex(uiWidgetTrias *tria,
                                       const rcti *rect,
                                       float triasize,
                                       char where,
                                       /* input data */
                                       const float verts[][2],
                                       const int verts_tot,
                                       const uint tris[][3],
                                       const int tris_tot)
{
  float sizex, sizey;
  int i1 = 0, i2 = 1;
 
  const float minsize = ELEM(where, 'r', 'l') ? BLI_rcti_size_y(rect) : BLI_rcti_size_x(rect);
 
  /* center position and size */
  float centx = float(rect->xmin) + 0.4f * minsize;
  float centy = float(rect->ymin) + 0.5f * minsize;
  tria->size = sizex = sizey = -0.5f * triasize * minsize;
 
  if (where == 'r') {
    centx = float(rect->xmax) - 0.4f * minsize;
    sizex = -sizex;
  }
  else if (where == 't') {
    centx = float(rect->xmin) + 0.5f * minsize;
    centy = float(rect->ymax) - 0.5f * minsize;
    sizey = -sizey;
    i2 = 0;
    i1 = 1;
  }
  else if (where == 'b') {
    centx = float(rect->xmin) + 0.5f * minsize;
    sizex = -sizex;
    i2 = 0;
    i1 = 1;
  }
 
  for (int a = 0; a < verts_tot; a++) {
    tria->vec[a][0] = sizex * verts[a][i1] + centx;
    tria->vec[a][1] = sizey * verts[a][i2] + centy;
  }
 
  tria->center[0] = centx;
  tria->center[1] = centy;
 
  tria->tot = tris_tot;
  tria->index = tris;
}
 
static void shape_preset_init_number_arrows(uiWidgetTrias *tria,
                                            const rcti *rect,
                                            float triasize,
                                            char where)
{
  tria->type = ROUNDBOX_TRIA_ARROWS;
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_number_arrow_vert,
                             ARRAY_SIZE(g_shape_preset_number_arrow_vert),
                             g_shape_preset_number_arrow_face,
                             ARRAY_SIZE(g_shape_preset_number_arrow_face));
}
 
static void shape_preset_init_hold_action(uiWidgetTrias *tria,
                                          const rcti *rect,
                                          float triasize,
                                          char where)
{
  tria->type = ROUNDBOX_TRIA_HOLD_ACTION_ARROW;
  /* With the current changes to use batches for widget drawing, the code
   * below is doing almost nothing effectively. 'where' doesn't work either,
   * shader is currently hardcoded to work for the button triangle pointing
   * at the lower right. The same limitation applies to other trias as well.
   * XXX Should be addressed. */
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_hold_action_vert,
                             ARRAY_SIZE(g_shape_preset_hold_action_vert),
                             g_shape_preset_hold_action_face,
                             ARRAY_SIZE(g_shape_preset_hold_action_face));
}
 
static void shape_preset_init_scroll_circle(uiWidgetTrias *tria,
                                            const rcti *rect,
                                            float triasize,
                                            char where)
{
  tria->type = ROUNDBOX_TRIA_SCROLL;
  shape_preset_init_trias_ex(tria,
                             rect,
                             triasize,
                             where,
                             g_shape_preset_scroll_circle_vert,
                             ARRAY_SIZE(g_shape_preset_scroll_circle_vert),
                             g_shape_preset_scroll_circle_face,
                             ARRAY_SIZE(g_shape_preset_scroll_circle_face));
}
 
static void widget_draw_vertex_buffer(uint pos,
                                      uint col,
                                      GPUPrimType mode,
                                      const float quads_pos[WIDGET_SIZE_MAX][2],
                                      const uchar quads_col[WIDGET_SIZE_MAX][4],
                                      uint totvert)
{
  immBegin(mode, totvert);
  for (int i = 0; i < totvert; i++) {
    if (quads_col) {
      immAttr4ubv(col, quads_col[i]);
    }
    immVertex2fv(pos, quads_pos[i]);
  }
  immEnd();
}
 
static void shape_preset_trias_from_rect_menu(uiWidgetTrias *tria, const rcti *rect)
{
  const float width = BLI_rcti_size_x(rect);
  const float height = BLI_rcti_size_y(rect);
  if ((width / height) < 0.5f) {
    /* Too narrow to fit. */
    return;
  }
  float centx, centy, size;
 
  tria->type = ROUNDBOX_TRIA_MENU;
 
  /* Center position and size. */
  tria->center[0] = centx = rect->xmin + 0.52f * BLI_rcti_size_y(rect);
  tria->center[1] = centy = rect->ymin + 0.52f * BLI_rcti_size_y(rect);
  tria->size = size = 0.4f * height;
 
  if (width > height * 1.1f) {
    /* For wider buttons align tighter to the right. */
    tria->center[0] = centx = rect->xmax - 0.32f * height;
  }
 
  for (int a = 0; a < 6; a++) {
    tria->vec[a][0] = size * g_shape_preset_menu_arrow_vert[a][0] + centx;
    tria->vec[a][1] = size * g_shape_preset_menu_arrow_vert[a][1] + centy;
  }
 
  tria->tot = 2;
  tria->index = g_shape_preset_menu_arrow_face;
}
 
static void shape_preset_trias_from_rect_checkmark(uiWidgetTrias *tria, const rcti *rect)
{
  float centx, centy, size;
 
  tria->type = ROUNDBOX_TRIA_CHECK;
 
  /* Center position and size. */
  tria->center[0] = centx = rect->xmin + 0.5f * BLI_rcti_size_y(rect);
  tria->center[1] = centy = rect->ymin + 0.5f * BLI_rcti_size_y(rect);
  tria->size = size = 0.5f * BLI_rcti_size_y(rect);
 
  for (int a = 0; a < 6; a++) {
    tria->vec[a][0] = size * g_shape_preset_checkmark_vert[a][0] + centx;
    tria->vec[a][1] = size * g_shape_preset_checkmark_vert[a][1] + centy;
  }
 
  tria->tot = 4;
  tria->index = g_shape_preset_checkmark_face;
}
 
static void shape_preset_trias_from_rect_dash(uiWidgetTrias *tria, const rcti *rect)
{
  tria->type = ROUNDBOX_TRIA_DASH;
 
  /* Center position and size. */
  tria->center[0] = rect->xmin + 0.5f * BLI_rcti_size_y(rect);
  tria->center[1] = rect->ymin + 0.5f * BLI_rcti_size_y(rect);
  tria->size = 0.5f * BLI_rcti_size_y(rect);
}

 
/* -------------------------------------------------------------------- */
 
/* prepares shade colors */
static void shadecolors4(
    const uchar *color, short shadetop, short shadedown, uchar r_coltop[4], uchar r_coldown[4])
{
  r_coltop[0] = std::clamp(color[0] + shadetop, 0, 255);
  r_coltop[1] = std::clamp(color[1] + shadetop, 0, 255);
  r_coltop[2] = std::clamp(color[2] + shadetop, 0, 255);
  r_coltop[3] = color[3];
 
  r_coldown[0] = std::clamp(color[0] + shadedown, 0, 255);
  r_coldown[1] = std::clamp(color[1] + shadedown, 0, 255);
  r_coldown[2] = std::clamp(color[2] + shadedown, 0, 255);
  r_coldown[3] = color[3];
}
 
static void widget_verts_to_triangle_strip(uiWidgetBase *wtb,
                                           const int totvert,
                                           float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2])
{
  int a;
  for (a = 0; a < totvert; a++) {
    copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[a]);
    copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[a]);
  }
  copy_v2_v2(triangle_strip[a * 2], wtb->outer_v[0]);
  copy_v2_v2(triangle_strip[a * 2 + 1], wtb->inner_v[0]);
}
 
static void widgetbase_outline(uiWidgetBase *wtb, uint pos)
{
  float triangle_strip[WIDGET_SIZE_MAX * 2 + 2][2]; /* + 2 because the last pair is wrapped */
  widget_verts_to_triangle_strip(wtb, wtb->totvert, triangle_strip);
 
  widget_draw_vertex_buffer(
      pos, 0, GPU_PRIM_TRI_STRIP, triangle_strip, nullptr, wtb->totvert * 2 + 2);
}
 
static void widgetbase_set_uniform_alpha_discard(uiWidgetBase *wtb,
                                                 const bool alpha_check,
                                                 const float discard_factor)
{
  if (alpha_check) {
    wtb->uniform_params.alpha_discard = -discard_factor;
  }
  else {
    wtb->uniform_params.alpha_discard = discard_factor;
  }
}
 
static void widgetbase_set_uniform_alpha_check(uiWidgetBase *wtb, const bool alpha_check)
{
  const float discard_factor = fabs(wtb->uniform_params.alpha_discard);
  widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}
 
static void widgetbase_set_uniform_discard_factor(uiWidgetBase *wtb, const float discard_factor)
{
  const bool alpha_check = wtb->uniform_params.alpha_discard < 0.0f;
  widgetbase_set_uniform_alpha_discard(wtb, alpha_check, discard_factor);
}
 
static void widgetbase_set_uniform_colors_ubv(uiWidgetBase *wtb,
                                              const uchar *col1,
                                              const uchar *col2,
                                              const uchar *outline,
                                              const uchar *emboss,
                                              const uchar *tria)
{
  rgba_float_args_set_ch(wtb->uniform_params.color_inner1, col1[0], col1[1], col1[2], col1[3]);
  rgba_float_args_set_ch(wtb->uniform_params.color_inner2, col2[0], col2[1], col2[2], col2[3]);
  rgba_float_args_set_ch(
      wtb->uniform_params.color_outline, outline[0], outline[1], outline[2], outline[3]);
  rgba_float_args_set_ch(
      wtb->uniform_params.color_emboss, emboss[0], emboss[1], emboss[2], emboss[3]);
  rgba_float_args_set_ch(wtb->uniform_params.color_tria, tria[0], tria[1], tria[2], tria[3]);
}

 
/* -------------------------------------------------------------------- */
 
/* keep in sync with shader */
#define MAX_WIDGET_BASE_BATCH 6
#define MAX_WIDGET_PARAMETERS 12
 
static struct {
  uiWidgetBaseParameters params[MAX_WIDGET_BASE_BATCH];
  int count;
  bool enabled;
} g_widget_base_batch = {{{{0}}}};
 
void UI_widgetbase_draw_cache_flush()
{
  const float checker_params[3] = {
      UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};
 
  if (g_widget_base_batch.count == 0) {
    return;
  }
 
  blender::gpu::Batch *batch = ui_batch_roundbox_widget_get();
  if (g_widget_base_batch.count == 1) {
    /* draw single */
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
    GPU_batch_uniform_4fv_array(batch,
                                "parameters",
                                MAX_WIDGET_PARAMETERS,
                                (const float (*)[4])g_widget_base_batch.params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw(batch);
  }
  else {
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE_INST);
    GPU_batch_uniform_4fv_array(batch,
                                "parameters",
                                MAX_WIDGET_PARAMETERS * MAX_WIDGET_BASE_BATCH,
                                (float (*)[4])g_widget_base_batch.params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw_instance_range(batch, 0, g_widget_base_batch.count);
  }
  g_widget_base_batch.count = 0;
}
 
void UI_widgetbase_draw_cache_begin()
{
  BLI_assert(g_widget_base_batch.enabled == false);
  g_widget_base_batch.enabled = true;
}
 
void UI_widgetbase_draw_cache_end()
{
  BLI_assert(g_widget_base_batch.enabled == true);
  g_widget_base_batch.enabled = false;
 
  GPU_blend(GPU_BLEND_ALPHA);
 
  UI_widgetbase_draw_cache_flush();
 
  GPU_blend(GPU_BLEND_NONE);
}
 
static void draw_widgetbase_batch(uiWidgetBase *wtb)
{
  wtb->uniform_params.tria_type = wtb->tria1.type;
  wtb->uniform_params.tria1_size = wtb->tria1.size;
  wtb->uniform_params.tria2_size = wtb->tria2.size;
  copy_v2_v2(wtb->uniform_params.tria1_center, wtb->tria1.center);
  copy_v2_v2(wtb->uniform_params.tria2_center, wtb->tria2.center);
 
  if (g_widget_base_batch.enabled) {
    g_widget_base_batch.params[g_widget_base_batch.count] = wtb->uniform_params;
    g_widget_base_batch.count++;
 
    if (g_widget_base_batch.count == MAX_WIDGET_BASE_BATCH) {
      UI_widgetbase_draw_cache_flush();
    }
  }
  else {
    const float checker_params[3] = {
        UI_ALPHA_CHECKER_DARK / 255.0f, UI_ALPHA_CHECKER_LIGHT / 255.0f, 8.0f};
    /* draw single */
    blender::gpu::Batch *batch = ui_batch_roundbox_widget_get();
    GPU_batch_program_set_builtin(batch, GPU_SHADER_2D_WIDGET_BASE);
    GPU_batch_uniform_4fv_array(
        batch, "parameters", MAX_WIDGET_PARAMETERS, (float (*)[4]) & wtb->uniform_params);
    GPU_batch_uniform_3fv(batch, "checkerColorAndSize", checker_params);
    GPU_batch_draw(batch);
  }
}
 
static void widgetbase_draw(uiWidgetBase *wtb, const uiWidgetColors *wcol)
{
  uchar inner_col1[4] = {0};
  uchar inner_col2[4] = {0};
  uchar emboss_col[4] = {0};
  uchar outline_col[4] = {0};
  uchar tria_col[4] = {0};
 
  /* backdrop non AA */
  if (wtb->draw_inner) {
    if (wcol->shaded == 0) {
      /* simple fill */
      inner_col1[0] = inner_col2[0] = wcol->inner[0];
      inner_col1[1] = inner_col2[1] = wcol->inner[1];
      inner_col1[2] = inner_col2[2] = wcol->inner[2];
      inner_col1[3] = inner_col2[3] = wcol->inner[3];
    }
    else {
      /* gradient fill */
      shadecolors4(wcol->inner, wcol->shadetop, wcol->shadedown, inner_col1, inner_col2);
    }
  }
 
  if (wtb->draw_outline) {
    outline_col[0] = wcol->outline[0];
    outline_col[1] = wcol->outline[1];
    outline_col[2] = wcol->outline[2];
    outline_col[3] = wcol->outline[3];
 
    /* Emboss shadow if enabled, and inner and outline colors are not fully transparent. */
    if ((wtb->draw_emboss) && (wcol->inner[3] != 0.0f || wcol->outline[3] != 0.0f)) {
      UI_GetThemeColor4ubv(TH_WIDGET_EMBOSS, emboss_col);
    }
  }
 
  if (wtb->tria1.type != ROUNDBOX_TRIA_NONE) {
    tria_col[0] = wcol->item[0];
    tria_col[1] = wcol->item[1];
    tria_col[2] = wcol->item[2];
    tria_col[3] = wcol->item[3];
  }
 
  /* Draw everything in one draw-call. */
  if (inner_col1[3] || inner_col2[3] || outline_col[3] || emboss_col[3] || tria_col[3]) {
    widgetbase_set_uniform_colors_ubv(
        wtb, inner_col1, inner_col2, outline_col, emboss_col, tria_col);
 
    GPU_blend(GPU_BLEND_ALPHA);
    draw_widgetbase_batch(wtb);
    GPU_blend(GPU_BLEND_NONE);
  }
}
 
/* widgetbase_draw variation for drawing colors, with full float color for wide gamut. */
static void widgetbase_draw_color(uiWidgetBase *wtb,
                                  const uiWidgetColors *wcol,
                                  float color[4],
                                  bool show_alpha_checkers)
{
  const uchar unused_col[4] = {0};
  uchar emboss_col[4] = {0};
  uchar outline_col[4] = {0};
 
  if (wtb->draw_outline) {
    outline_col[0] = wcol->outline[0];
    outline_col[1] = wcol->outline[1];
    outline_col[2] = wcol->outline[2];
    outline_col[3] = wcol->outline[3];
 
    /* Emboss shadow if enabled, and inner and outline colors are not fully transparent. */
    if ((wtb->draw_emboss) && (wcol->inner[3] != 0.0f || wcol->outline[3] != 0.0f)) {
      UI_GetThemeColor4ubv(TH_WIDGET_EMBOSS, emboss_col);
    }
  }
 
  /* Draw everything in one draw-call. */
  widgetbase_set_uniform_alpha_check(wtb, show_alpha_checkers);
  widgetbase_set_uniform_colors_ubv(
      wtb, unused_col, unused_col, outline_col, emboss_col, unused_col);
  copy_v4_v4(wtb->uniform_params.color_inner1, color);
  copy_v4_v4(wtb->uniform_params.color_inner2, color);
 
  GPU_blend(GPU_BLEND_ALPHA);
  draw_widgetbase_batch(wtb);
  GPU_blend(GPU_BLEND_NONE);
}

 
/* -------------------------------------------------------------------- */
 
#define UI_TEXT_CLIP_MARGIN (0.25f * U.widget_unit / but->block->aspect)
 
#define PREVIEW_PAD (0.15f * UI_UNIT_X)
 
static float widget_alpha_factor(const uiWidgetStateInfo *state)
{
  if (state->but_flag & (UI_BUT_INACTIVE | UI_BUT_DISABLED)) {
    if (state->but_flag & UI_SEARCH_FILTER_NO_MATCH) {
      return 0.25f;
    }
    return 0.5f;
  }
 
  if (state->but_flag & UI_SEARCH_FILTER_NO_MATCH) {
    return 0.5f;
  }
 
  return 1.0f;
}
 
static void widget_draw_icon_centered(const BIFIconID icon,
                                      const float aspect,
                                      const float alpha,
                                      const rcti *rect,
                                      const uchar mono_color[4])
{
  if (icon == ICON_NONE) {
    return;
  }
 
  const float size = ICON_DEFAULT_HEIGHT / (aspect * UI_INV_SCALE_FAC);
 
  if (size > 0) {
    const int x = BLI_rcti_cent_x(rect) - size / 2;
    const int y = BLI_rcti_cent_y(rect) - size / 2;
 
    const bTheme *btheme = UI_GetTheme();
    const float desaturate = 1.0 - btheme->tui.icon_saturation;
    uchar color[4] = {mono_color[0], mono_color[1], mono_color[2], mono_color[3]};
    const bool has_theme = UI_icon_get_theme_color(int(icon), color);
    const bool outline = btheme->tui.icon_border_intensity > 0.0f && has_theme;
 
    UI_icon_draw_ex(
        x, y, icon, aspect * UI_INV_SCALE_FAC, alpha, desaturate, color, outline, nullptr);
  }
}

static void widget_draw_preview_icon(BIFIconID icon,
                                     float alpha,
                                     float aspect,
                                     const bool add_padding,
                                     const rcti *rect,
                                     const uchar mono_color[4])
{
  if (icon == ICON_NONE) {
    return;
  }
 
  if (icon < BIFICONID_LAST_STATIC) {
    widget_draw_icon_centered(icon, aspect, alpha, rect, mono_color);
    return;
  }
 
  const int w = BLI_rcti_size_x(rect);
  const int h = BLI_rcti_size_y(rect);
  const int size = std::min(w, h) - (add_padding ? (PREVIEW_PAD * 2) : 0);
 
  if (size > 0) {
    const int x = rect->xmin + w / 2 - size / 2;
    const int y = rect->ymin + h / 2 - size / 2;
 
    UI_icon_draw_preview(x, y, icon, 1.0f, alpha, size);
  }
}
 
static int ui_but_draw_menu_icon(const uiBut *but)
{
  return (but->flag & UI_BUT_ICON_SUBMENU) && (but->emboss == blender::ui::EmbossType::Pulldown);
}
 
/* icons have been standardized... and this call draws in untransformed coordinates */
 
static void widget_draw_icon(
    const uiBut *but, BIFIconID icon, float alpha, const rcti *rect, const uchar mono_color[4])
{
  if (but->flag & UI_BUT_ICON_PREVIEW) {
    GPU_blend(GPU_BLEND_ALPHA);
    widget_draw_preview_icon(icon,
                             alpha,
                             but->block->aspect,
                             !(but->drawflag & UI_BUT_NO_PREVIEW_PADDING),
                             rect,
                             mono_color);
    GPU_blend(GPU_BLEND_NONE);
    return;
  }
 
  /* this icon doesn't need draw... */
  if (icon == ICON_BLANK1 && (but->flag & UI_BUT_ICON_SUBMENU) == 0) {
    return;
  }
 
  const float aspect = but->block->aspect * UI_INV_SCALE_FAC;
  const float height = ICON_DEFAULT_HEIGHT / aspect;
 
  /* calculate blend color */
  if (ELEM(but->type, ButType::Toggle, ButType::Row, ButType::ToggleN, ButType::ListRow)) {
    if (but->flag & UI_SELECT) {
      /* pass */
    }
    else if (but->flag & UI_HOVER) {
      /* pass */
    }
    else {
      alpha = 0.75f;
    }
  }
  else if (but->type == ButType::Label) {
    /* extra feature allows more alpha blending */
    const uiButLabel *but_label = reinterpret_cast<const uiButLabel *>(but);
    alpha *= but_label->alpha_factor;
  }
  else if (ELEM(but->type, ButType::But, ButType::Decorator)) {
    uiWidgetStateInfo state = {0};
    state.but_flag = but->flag;
    state.but_drawflag = but->drawflag;
    alpha *= widget_alpha_factor(&state);
  }
 
  /* Dim the icon as its space is reduced to zero. */
  if (height > (rect->xmax - rect->xmin)) {
    alpha *= std::max(float(rect->xmax - rect->xmin) / height, 0.0f);
  }
 
  GPU_blend(GPU_BLEND_ALPHA);
 
  if (icon && icon != ICON_BLANK1) {
    const float ofs = 1.0f / aspect;
    float xs, ys;
 
    if (but->drawflag & UI_BUT_ICON_LEFT) {
      /* special case - icon_only pie buttons */
      if (ui_block_is_pie_menu(but->block) && !ELEM(but->type, ButType::Menu, ButType::Popover) &&
          but->str.empty())
      {
        xs = rect->xmin + 2.0f * ofs;
      }
      else if (but->emboss == blender::ui::EmbossType::None || but->type == ButType::Label) {
        xs = rect->xmin + 2.0f * ofs;
      }
      else {
        xs = rect->xmin + 4.0f * ofs;
      }
    }
    else {
      xs = (rect->xmin + rect->xmax - height) / 2.0f;
    }
    ys = (rect->ymin + rect->ymax - height) / 2.0f;
 
    /* force positions to integers, for zoom levels near 1. draws icons crisp. */
    if (aspect > 0.95f && aspect < 1.05f) {
      xs = roundf(xs);
      ys = roundf(ys);
    }
 
    /* Get theme color. */
    uchar color[4] = {mono_color[0], mono_color[1], mono_color[2], mono_color[3]};
    const bTheme *btheme = UI_GetTheme();
    /* Only use theme colors if the button doesn't override the color. */
    const bool has_theme = !but->col[3] && UI_icon_get_theme_color(int(icon), color);
    const bool outline = btheme->tui.icon_border_intensity > 0.0f && has_theme;
 
    /* to indicate draggable */
    if (ui_but_drag_is_draggable(but) && (but->flag & UI_HOVER)) {
      UI_icon_draw_ex(xs, ys, icon, aspect, 1.25f, 0.0f, color, outline, &but->icon_overlay_text);
    }
    else if (but->flag & (UI_HOVER | UI_SELECT | UI_SELECT_DRAW)) {
      UI_icon_draw_ex(xs, ys, icon, aspect, alpha, 0.0f, color, outline, &but->icon_overlay_text);
    }
    else if (!((but->icon != ICON_NONE) && UI_but_is_tool(but))) {
      if (has_theme) {
        alpha *= 0.8f;
      }
      UI_icon_draw_ex(xs,
                      ys,
                      icon,
                      aspect,
                      alpha,
                      0.0f,
                      color,
                      outline,
                      &but->icon_overlay_text,
                      but->drawflag & UI_BUT_ICON_INVERT);
    }
    else {
      const float desaturate = 1.0 - btheme->tui.icon_saturation;
      UI_icon_draw_ex(
          xs, ys, icon, aspect, alpha, desaturate, color, outline, &but->icon_overlay_text);
    }
  }
 
  GPU_blend(GPU_BLEND_NONE);
}
 
static void widget_draw_submenu_tria(const uiBut *but,
                                     const rcti *rect,
                                     const uiWidgetColors *wcol)
{
  const float aspect = but->block->aspect * UI_INV_SCALE_FAC;
  const int tria_height = int(ICON_DEFAULT_HEIGHT / aspect);
  const int tria_width = int(ICON_DEFAULT_WIDTH / aspect) - 2 * U.pixelsize;
  const int xs = rect->xmax - tria_width;
  const int ys = (rect->ymin + rect->ymax - tria_height) / 2.0f;
 
  float col[4];
  rgba_uchar_to_float(col, wcol->text);
  col[3] *= 0.8f;
 
  rctf tria_rect;
  BLI_rctf_init(&tria_rect, xs, xs + tria_width, ys, ys + tria_height);
  BLI_rctf_scale(&tria_rect, 0.4f);
 
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);
  draw_anti_tria_rect(&tria_rect, 'h', col);
}
 
static void ui_text_clip_give_prev_off(uiBut *but, const char *str)
{
  const char *prev_utf8 = BLI_str_find_prev_char_utf8(str + but->ofs, str);
  const int bytes = str + but->ofs - prev_utf8;
 
  but->ofs -= bytes;
}
 
static void ui_text_clip_give_next_off(uiBut *but, const char *str, const char *str_end)
{
  const char *next_utf8 = BLI_str_find_next_char_utf8(str + but->ofs, str_end);
  const int bytes = next_utf8 - (str + but->ofs);
 
  but->ofs += bytes;
}

static void ui_text_clip_right_ex(const uiFontStyle *fstyle,
                                  char *str,
                                  const size_t max_len,
                                  const float okwidth,
                                  const char *sep,
                                  const int sep_len,
                                  const float sep_strwidth,
                                  size_t *r_final_len)
{
  BLI_assert(str[0]);
 
  /* How many BYTES (not characters) of this UTF8 string can fit, along with appended ellipsis. */
  int l_end = BLF_width_to_strlen(
      fstyle->uifont_id, str, max_len, okwidth - sep_strwidth, nullptr);
 
  if (l_end > 0) {
    /* At least one character, so clip and add the ellipsis. */
    memcpy(str + l_end, sep, sep_len + 1); /* +1 for trailing '\0'. */
    if (r_final_len) {
      *r_final_len = size_t(l_end) + sep_len;
    }
  }
  else {
    /* Otherwise fit as much as we can without adding an ellipsis. */
    l_end = BLF_width_to_strlen(fstyle->uifont_id, str, max_len, okwidth, nullptr);
    str[l_end] = '\0';
    if (r_final_len) {
      *r_final_len = size_t(l_end);
    }
  }
}
 
float UI_text_clip_middle_ex(const uiFontStyle *fstyle,
                             char *str,
                             float okwidth,
                             const float minwidth,
                             const size_t max_len,
                             const char rpart_sep,
                             const bool clip_right_if_tight)
{
  BLI_assert(str[0]);
 
  /* need to set this first */
  UI_fontstyle_set(fstyle);
 
  float strwidth = BLF_width(fstyle->uifont_id, str, max_len);
 
  if ((okwidth > 0.0f) && (strwidth > okwidth)) {
    const char sep[] = BLI_STR_UTF8_HORIZONTAL_ELLIPSIS;
    const int sep_len = sizeof(sep) - 1;
    const float sep_strwidth = BLF_width(fstyle->uifont_id, sep, sep_len + 1);
 
    char *rpart = nullptr, rpart_buf[UI_MAX_DRAW_STR];
    float rpart_width = 0.0f;
    size_t rpart_len = 0;
    size_t final_lpart_len;
 
    if (rpart_sep) {
      rpart = strrchr(str, rpart_sep);
 
      if (rpart) {
        rpart_len = strlen(rpart);
        rpart_width = BLF_width(fstyle->uifont_id, rpart, rpart_len);
        okwidth -= rpart_width;
        strwidth -= rpart_width;
 
        if (okwidth < 0.0f) {
          /* Not enough place for actual label, just display protected right part.
           * Here just for safety, should never happen in real life! */
          memmove(str, rpart, rpart_len + 1);
          rpart = nullptr;
          okwidth += rpart_width;
          strwidth = rpart_width;
        }
      }
    }
 
    const float parts_strwidth = (okwidth - sep_strwidth) / 2.0f;
 
    if (rpart) {
      STRNCPY(rpart_buf, rpart);
      *rpart = '\0';
      rpart = rpart_buf;
    }
 
    const size_t l_end = BLF_width_to_strlen(
        fstyle->uifont_id, str, max_len, parts_strwidth, nullptr);
    if (clip_right_if_tight &&
        (l_end < 10 || min_ff(parts_strwidth, strwidth - okwidth) < minwidth))
    {
      /* If we really have no place, or we would clip a very small piece of string in the middle,
       * only show start of string.
       */
      ui_text_clip_right_ex(
          fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
    }
    else {
      size_t r_offset, r_len;
 
      r_offset = BLF_width_to_rstrlen(fstyle->uifont_id, str, max_len, parts_strwidth, nullptr);
      r_len = strlen(str + r_offset) + 1; /* +1 for the trailing '\0'. */
 
      if (l_end + sep_len + r_len + rpart_len > max_len) {
        /* Corner case, the str already takes all available mem,
         * and the ellipsis chars would actually add more chars.
         * Better to just trim one or two letters to the right in this case...
         * NOTE: with a single-char ellipsis, this should never happen! But better be safe
         * here...
         */
        ui_text_clip_right_ex(
            fstyle, str, max_len, okwidth, sep, sep_len, sep_strwidth, &final_lpart_len);
      }
      else {
        memmove(str + l_end + sep_len, str + r_offset, r_len);
        memcpy(str + l_end, sep, sep_len);
        /* -1 to remove trailing '\0'! */
        final_lpart_len = size_t(l_end + sep_len + r_len - 1);
 
/* Seems like this was only needed because of an error in #BLF_width_to_rstrlen(), not because of
 * integer imprecision. See PR #135239. */
#if 0
        while (BLF_width(fstyle->uifont_id, str, max_len) > okwidth) {
          /* This will happen because a lot of string width processing is done in integer pixels,
           * which can introduce a rather high error in the end (about 2 pixels or so).
           * Only one char removal shall ever be needed in real-life situation... */
          r_len--;
          final_lpart_len--;
          char *c = str + l_end + sep_len;
          memmove(c, c + 1, r_len);
        }
#endif
      }
    }
 
    if (rpart) {
      /* Add back preserved right part to our shorten str. */
      memcpy(str + final_lpart_len, rpart, rpart_len + 1); /* +1 for trailing '\0'. */
      okwidth += rpart_width;
    }
 
    strwidth = BLF_width(fstyle->uifont_id, str, max_len);
  }
 
  /* The following assert is meant to catch code changes that break this function's result, but
   * some wriggle room is fine and needed. Just a couple pixels for large sizes and with some
   * settings like "Full" hinting which can move features both left and right a pixel. We could
   * probably reduce this to one pixel if we consolidate text output with length measuring. But
   * our text string lengths include the last character's right-side bearing anyway, so a string
   * can be longer by that amount and still fit visibly in the required space. */
  BLI_assert((strwidth <= (okwidth + 2)) || (okwidth <= 0.0f) ||
             /* TODO: proper handling of non UTF8 strings. */
             (BLI_str_utf8_invalid_byte(str, max_len) != -1));
  UNUSED_VARS_NDEBUG(okwidth);
 
  return strwidth;
}

static void ui_text_clip_middle(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  /* No margin for labels! */
  const int border = ELEM(but->type, ButType::Label, ButType::Menu, ButType::Popover) ?
                         0 :
                         int(UI_TEXT_CLIP_MARGIN + 0.5f);
  const float okwidth = float(max_ii(BLI_rcti_size_x(rect) - border, 0));
  const float minwidth = UI_ICON_SIZE / but->block->aspect * 2.0f;
 
  but->ofs = 0;
  char new_drawstr[UI_MAX_DRAW_STR];
  STRNCPY(new_drawstr, but->drawstr.c_str());
  const size_t max_len = sizeof(new_drawstr);
  but->strwidth = UI_text_clip_middle_ex(fstyle, new_drawstr, okwidth, minwidth, max_len, '\0');
  but->drawstr = new_drawstr;
}

static void ui_text_clip_middle_protect_right(const uiFontStyle *fstyle,
                                              uiBut *but,
                                              const rcti *rect,
                                              const char rsep)
{
  /* No margin for labels! */
  const int border = ELEM(but->type, ButType::Label, ButType::Menu, ButType::Popover) ?
                         0 :
                         int(UI_TEXT_CLIP_MARGIN + 0.5f);
  const float okwidth = float(max_ii(BLI_rcti_size_x(rect) - border, 0));
  const float minwidth = UI_ICON_SIZE / but->block->aspect * 2.0f;
 
  but->ofs = 0;
  char new_drawstr[UI_MAX_DRAW_STR];
  STRNCPY(new_drawstr, but->drawstr.c_str());
  const size_t max_len = sizeof(new_drawstr);
  but->strwidth = UI_text_clip_middle_ex(fstyle, new_drawstr, okwidth, minwidth, max_len, rsep);
  but->drawstr = new_drawstr;
}
 
blender::Vector<blender::StringRef> UI_text_clip_multiline_middle(
    const uiFontStyle *fstyle,
    const char *str,
    char *clipped_str_buf,
    const size_t clipped_str_buf_maxncpy,
    const float max_line_width,
    const int max_lines)
{
  using namespace blender;
  BLI_assert(max_lines > 0);
 
  const Vector<StringRef> lines = BLF_string_wrap(
      fstyle->uifont_id,
      str,
      max_line_width,
      BLFWrapMode(int(BLFWrapMode::Typographical) | int(BLFWrapMode::HardLimit)));
 
  if (lines.size() <= max_lines) {
    return lines;
  }
 
  Vector<StringRef> clipped_lines;
  clipped_lines.reserve(max_lines);
 
  if (max_lines == 1) {
    BLI_strncpy(clipped_str_buf, str, clipped_str_buf_maxncpy);
 
    UI_text_clip_middle_ex(
        fstyle, clipped_str_buf, max_line_width, UI_ICON_SIZE, clipped_str_buf_maxncpy, '\0');
    clipped_lines.append(clipped_str_buf);
    return clipped_lines;
  }
  if (max_lines == 2) {
    clipped_lines.append(lines[0]);
    BLI_strncpy(clipped_str_buf, str + lines[0].size(), clipped_str_buf_maxncpy);
    UI_text_clip_middle_ex(fstyle,
                           clipped_str_buf,
                           max_line_width,
                           UI_ICON_SIZE,
                           clipped_str_buf_maxncpy,
                           '\0',
                           false);
    clipped_lines.append(clipped_str_buf);
    return clipped_lines;
  }
 
  /* The line in the middle that will get the "..." (rounded upwards, so will use the first line of
   * the second half if the number of lines is even) */
  const int middle_index = max_lines / 2;
 
  /* Take the lines until the middle line with the "..." as is. */
  for (int i = 0; i < middle_index; i++) {
    clipped_lines.append(lines[i]);
  }
 
  /* Clip the middle of the middle line. */
  {
    BLI_strncpy(clipped_str_buf, lines[middle_index].data(), clipped_str_buf_maxncpy);
    UI_text_clip_middle_ex(fstyle,
                           clipped_str_buf,
                           max_line_width,
                           UI_ICON_SIZE,
                           clipped_str_buf_maxncpy,
                           '\0',
                           false);
    clipped_lines.append(clipped_str_buf);
  }
 
  /* All remaining lines should be completely filled, including the last one. So fill lines
   * backwards, and append them to #clipped_lines in the correct order afterwards. */
  if ((middle_index + 1) < max_lines) {
    const char *remaining = lines[middle_index + 1].data();
    size_t remaining_len = strlen(remaining);
    std::list<StringRef> last_lines;
    for (int i = 0; i < max_lines - (middle_index + 1) && remaining_len; i++) {
      size_t offset = BLF_width_to_rstrlen(
          fstyle->uifont_id, remaining, remaining_len, max_line_width, nullptr);
      size_t line_len = remaining_len - offset;
      last_lines.emplace_front(remaining + offset, int64_t(line_len));
      remaining_len = offset;
    }
 
    for (StringRef line : last_lines) {
      clipped_lines.append(line);
    }
  }
 
  return clipped_lines;
}

static void ui_text_clip_cursor(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  const int border = int(UI_TEXT_CLIP_MARGIN + 0.5f);
  const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);
 
  BLI_assert(but->editstr && but->pos >= 0);
 
  /* need to set this first */
  UI_fontstyle_set(fstyle);
 
  /* define ofs dynamically */
  but->ofs = std::min(but->ofs, but->pos);
 
  if (BLF_width(fstyle->uifont_id, but->editstr, INT_MAX) <= okwidth) {
    but->ofs = 0;
  }
 
  but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, INT_MAX);
 
  if (but->strwidth > okwidth) {
    const int editstr_len = strlen(but->editstr);
    int len = editstr_len;
 
    while (but->strwidth > okwidth) {
      float width;
 
      /* string position of cursor */
      width = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, (but->pos - but->ofs));
 
      /* if cursor is at 20 pixels of right side button we clip left */
      if (width > okwidth - 20) {
        ui_text_clip_give_next_off(but, but->editstr, but->editstr + editstr_len);
      }
      else {
        /* shift string to the left */
        if (width < 20 && but->ofs > 0) {
          ui_text_clip_give_prev_off(but, but->editstr);
        }
        len -= BLI_str_utf8_size_safe(
            BLI_str_find_prev_char_utf8(but->editstr + len, but->editstr));
      }
 
      but->strwidth = BLF_width(fstyle->uifont_id, but->editstr + but->ofs, len - but->ofs);
 
      if (but->strwidth < 10) {
        break;
      }
    }
  }
}

static void ui_text_clip_right_label(const uiFontStyle *fstyle, uiBut *but, const rcti *rect)
{
  const int border = UI_TEXT_CLIP_MARGIN + 1;
  const int okwidth = max_ii(BLI_rcti_size_x(rect) - border, 0);
 
  int drawstr_len = but->drawstr.size();
  char new_drawstr[UI_MAX_DRAW_STR];
  STRNCPY(new_drawstr, but->drawstr.c_str());
 
  const char *cpend = new_drawstr + drawstr_len;
 
  /* need to set this first */
  UI_fontstyle_set(fstyle);
 
  but->strwidth = BLF_width(fstyle->uifont_id, new_drawstr, drawstr_len);
 
  /* The string already fits, so do nothing. */
  if (but->strwidth <= okwidth) {
    return;
  }
 
  const char sep[] = BLI_STR_UTF8_HORIZONTAL_ELLIPSIS;
  const int sep_len = sizeof(sep) - 1;
  const float sep_strwidth = BLF_width(fstyle->uifont_id, sep, sep_len + 1);
 
  /* Assume the string will have an ellipsis for initial tests. */
  but->strwidth += sep_strwidth;
 
  but->ofs = 0;
 
  /* First shorten number-buttons eg,
   *   Translucency: 0.000
   * becomes
   *   Trans: 0.000
   */
 
  /* find the space after ':' separator */
  char *cpoin = strrchr(new_drawstr, ':');
 
  if (cpoin && (cpoin < cpend - 2)) {
    char *cp2 = cpoin;
 
    /* chop off the leading text, starting from the right */
    while (but->strwidth > okwidth && cp2 > new_drawstr) {
      const char *prev_utf8 = BLI_str_find_prev_char_utf8(cp2, new_drawstr);
      const int bytes = cp2 - prev_utf8;
 
      /* shift the text after and including cp2 back by 1 char,
       * +1 to include null terminator */
      memmove(cp2 - bytes, cp2, drawstr_len + 1);
      cp2 -= bytes;
 
      drawstr_len -= bytes;
 
      but->strwidth = BLF_width(fstyle->uifont_id,
                                new_drawstr + but->ofs,
                                sizeof(new_drawstr) - but->ofs) +
                      sep_strwidth;
      if (but->strwidth < sep_strwidth) {
        break;
      }
    }
 
    /* after the leading text is gone, chop off the : and following space, with ofs */
    while ((but->strwidth > okwidth) && (but->ofs < 2)) {
      ui_text_clip_give_next_off(but, new_drawstr, new_drawstr + drawstr_len);
      but->strwidth = BLF_width(
          fstyle->uifont_id, new_drawstr + but->ofs, sizeof(new_drawstr) - but->ofs);
      if (but->strwidth < 10) {
        break;
      }
    }
  }
 
  /* Now just remove trailing chars */
  /* once the label's gone, chop off the least significant digits */
  if (but->strwidth > okwidth) {
    float strwidth;
    drawstr_len = BLF_width_to_strlen(fstyle->uifont_id,
                                      new_drawstr + but->ofs,
                                      drawstr_len - but->ofs,
                                      okwidth,
                                      &strwidth) +
                  but->ofs;
    but->strwidth = strwidth;
    new_drawstr[drawstr_len] = 0;
  }
 
  cpoin = strrchr(new_drawstr, ':');
  if (cpoin && (cpoin - new_drawstr > 0) && (drawstr_len < (sizeof(new_drawstr) - sep_len))) {
    /* We shortened the string and still have a colon, so insert ellipsis. */
    memmove(cpoin + sep_len, cpoin, cpend - cpoin);
    memcpy(cpoin, sep, sep_len);
    but->strwidth = BLF_width(
        fstyle->uifont_id, new_drawstr + but->ofs, sizeof(new_drawstr) - but->ofs);
  }
 
  but->drawstr = new_drawstr;
}
 
#ifdef WITH_INPUT_IME
static void widget_draw_text_ime_underline(const uiFontStyle *fstyle,
                                           const uiWidgetColors *wcol,
                                           const uiBut *but,
                                           const rcti *rect,
                                           const wmIMEData *ime_data,
                                           const char *drawstr)
{
  int ofs_x, width;
  int rect_x = BLI_rcti_size_x(rect);
  int sel_start = ime_data->sel_start, sel_end = ime_data->sel_end;
  float fcol[4];
 
  if (drawstr[0] != 0) {
    if (but->pos >= but->ofs) {
      ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, but->pos - but->ofs);
    }
    else {
      ofs_x = 0;
    }
 
    width = BLF_width(
        fstyle->uifont_id, drawstr + but->ofs, ime_data->composite.size() + but->pos - but->ofs);
 
    rgba_uchar_to_float(fcol, wcol->text);
    UI_draw_text_underline(rect->xmin + ofs_x,
                           rect->ymin + 6 * U.pixelsize,
                           min_ii(width, rect_x - 2) - ofs_x,
                           1,
                           fcol);
 
    /* draw the thick line */
    if (sel_start != -1 && sel_end != -1) {
      sel_end -= sel_start;
      sel_start += but->pos;
 
      if (sel_start >= but->ofs) {
        ofs_x = BLF_width(fstyle->uifont_id, drawstr + but->ofs, sel_start - but->ofs);
      }
      else {
        ofs_x = 0;
      }
 
      width = BLF_width(fstyle->uifont_id, drawstr + but->ofs, sel_end + sel_start - but->ofs);
 
      UI_draw_text_underline(rect->xmin + ofs_x,
                             rect->ymin + 6 * U.pixelsize,
                             min_ii(width, rect_x - 2) - ofs_x,
                             2,
                             fcol);
    }
  }
}
#endif /* WITH_INPUT_IME */
 
static void widget_draw_text(const uiFontStyle *fstyle,
                             const uiWidgetColors *wcol,
                             uiBut *but,
                             rcti *rect)
{
  int drawstr_left_len = UI_MAX_DRAW_STR;
  const char *drawstr = but->drawstr.c_str();
  const char *drawstr_right = nullptr;
  bool use_right_only = false;
  const char *indeterminate_str = UI_VALUE_INDETERMINATE_CHAR;
 
#ifdef WITH_INPUT_IME
  const wmIMEData *ime_data;
#endif
 
  UI_fontstyle_set(fstyle);
 
  eFontStyle_Align align;
  if (but->editstr || (but->drawflag & UI_BUT_TEXT_LEFT)) {
    align = UI_STYLE_TEXT_LEFT;
  }
  else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
    align = UI_STYLE_TEXT_RIGHT;
  }
  else {
    align = UI_STYLE_TEXT_CENTER;
  }
 
  /* Special case: when we're entering text for multiple buttons,
   * don't draw the text for any of the multi-editing buttons */
  if (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI)) {
    uiBut *but_edit = ui_but_drag_multi_edit_get(but);
    if (but_edit) {
      drawstr = but_edit->editstr;
      align = UI_STYLE_TEXT_LEFT;
    }
  }
  else {
    if (but->editstr) {
      /* The maximum length isn't used in this case,
       * we rely on string being null terminated. */
      drawstr_left_len = INT_MAX;
 
#ifdef WITH_INPUT_IME
      /* FIXME: IME is modifying `const char *drawstr`! */
      ime_data = ui_but_ime_data_get(but);
 
      if (ime_data && ime_data->composite.size()) {
        /* insert composite string into cursor pos */
        char tmp_drawstr[UI_MAX_DRAW_STR];
        STRNCPY(tmp_drawstr, drawstr);
        BLI_snprintf(tmp_drawstr,
                     sizeof(tmp_drawstr),
                     "%.*s%s%s",
                     but->pos,
                     but->editstr,
                     ime_data->composite.c_str(),
                     but->editstr + but->pos);
        but->drawstr = tmp_drawstr;
        drawstr = but->drawstr.c_str();
      }
      else
#endif
      {
        drawstr = but->editstr;
      }
    }
  }
 
  /* If not editing and indeterminate, show dash. */
  if (but->drawflag & UI_BUT_INDETERMINATE && !but->editstr &&
      ELEM(but->type,
           ButType::Menu,
           ButType::Num,
           ButType::NumSlider,
           ButType::Text,
           ButType::SearchMenu))
  {
    drawstr = indeterminate_str;
    drawstr_left_len = strlen(drawstr);
    align = UI_STYLE_TEXT_CENTER;
  }
 
  /* text button selection, cursor, composite underline */
  if (but->editstr && but->pos != -1) {
    int but_pos_ofs;
 
#ifdef WITH_INPUT_IME
    bool ime_reposition_window = false;
    int ime_win_x, ime_win_y;
#endif
 
    /* text button selection */
    if ((but->selend - but->selsta) != 0 && drawstr[0] != 0) {
      /* We are drawing on top of widget bases. Flush cache. */
      GPU_blend(GPU_BLEND_ALPHA);
      UI_widgetbase_draw_cache_flush();
      uint pos = GPU_vertformat_attr_add(
          immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
      immUniformColor4ubv(wcol->item);
      const auto boxes = BLF_str_selection_boxes(
          fstyle->uifont_id,
          drawstr + but->ofs,
          strlen(drawstr + but->ofs),
          (but->selsta >= but->ofs) ? but->selsta - but->ofs : 0,
          but->selend - std::max(but->ofs, but->selsta));
      for (auto bounds : boxes) {
        immRectf(pos,
                 rect->xmin + bounds.min,
                 rect->ymin + U.pixelsize,
                 std::min(rect->xmin + bounds.max, rect->xmax - 2),
                 rect->ymax - U.pixelsize);
      }
      immUnbindProgram();
      GPU_blend(GPU_BLEND_NONE);
 
#ifdef WITH_INPUT_IME
      /* IME candidate window uses selection position. */
      if (!ime_reposition_window && boxes.size() > 0) {
        ime_reposition_window = true;
        ime_win_x = rect->xmin + boxes[0].min;
        ime_win_y = rect->ymin + U.pixelsize;
      }
#endif
    }
 
    /* Text cursor position. */
    but_pos_ofs = but->pos;
 
#ifdef WITH_INPUT_IME
    /* If is IME compositing, move the cursor. */
    if (ime_data && ime_data->composite.size() && ime_data->cursor_pos != -1) {
      but_pos_ofs += ime_data->cursor_pos;
    }
#endif
 
    /* Draw text cursor (caret). */
    if (but->pos >= but->ofs) {
 
      int t = BLF_str_offset_to_cursor(fstyle->uifont_id,
                                       drawstr + but->ofs,
                                       UI_MAX_DRAW_STR,
                                       but_pos_ofs - but->ofs,
                                       max_ii(1, int(U.pixelsize * 2)));
 
      /* We are drawing on top of widget bases. Flush cache. */
      GPU_blend(GPU_BLEND_ALPHA);
      UI_widgetbase_draw_cache_flush();
      GPU_blend(GPU_BLEND_NONE);
 
      uint pos = GPU_vertformat_attr_add(
          immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
      immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
      immUniformThemeColor(TH_WIDGET_TEXT_CURSOR);
 
      /* draw cursor */
      immRectf(pos,
               rect->xmin + t,
               rect->ymin + U.pixelsize,
               rect->xmin + t + int(2.0f * U.pixelsize),
               rect->ymax - U.pixelsize);
 
      immUnbindProgram();
 
#ifdef WITH_INPUT_IME
      /* IME candidate window uses cursor position. */
      if (!ime_reposition_window) {
        ime_reposition_window = true;
        ime_win_x = rect->xmin + t + 5;
        ime_win_y = rect->ymin + 3;
      }
#endif
    }
 
#ifdef WITH_INPUT_IME
    /* IME cursor following. */
    if (ime_reposition_window) {
      ui_but_ime_reposition(but, ime_win_x, ime_win_y, false);
    }
    if (ime_data && ime_data->composite.size()) {
      /* Composite underline. */
      widget_draw_text_ime_underline(fstyle, wcol, but, rect, ime_data, drawstr);
    }
#endif
  }
 
#if 0
  ui_rasterpos_safe(x, y, but->aspect);
  transopts = ui_translate_buttons();
#endif
 
  bool use_drawstr_right_as_hint = false;
 
  /* cut string in 2 parts - only for menu entries */
  if (but->flag & UI_BUT_HAS_SEP_CHAR && (but->editstr == nullptr)) {
    drawstr_right = strrchr(drawstr, UI_SEP_CHAR);
    if (drawstr_right) {
      use_drawstr_right_as_hint = true;
      drawstr_left_len = (drawstr_right - drawstr);
      drawstr_right++;
    }
  }
 
#ifdef USE_NUMBUTS_LR_ALIGN
  if (!drawstr_right && (but->drawflag & UI_BUT_TEXT_LEFT) &&
      ELEM(but->type, ButType::Num, ButType::NumSlider) &&
      /* if we're editing or multi-drag (fake editing), then use left alignment */
      (but->editstr == nullptr) && (drawstr == but->drawstr))
  {
    drawstr_right = strrchr(drawstr + but->ofs, ':');
    if (drawstr_right) {
      drawstr_right++;
      drawstr_left_len = (drawstr_right - drawstr - 1);
 
      while (*drawstr_right == ' ') {
        drawstr_right++;
      }
    }
    else {
      /* no prefix, even so use only cpoin */
      drawstr_right = drawstr + but->ofs;
      use_right_only = true;
    }
  }
#endif
 
  if (!use_right_only) {
    /* for underline drawing */
    int font_xofs, font_yofs;
 
    int drawlen = (drawstr_left_len == INT_MAX) ? strlen(drawstr + but->ofs) :
                                                  (drawstr_left_len - but->ofs);
 
    if (drawlen > 0) {
      uiFontStyleDraw_Params params{};
      params.align = align;
      UI_fontstyle_draw_ex(fstyle,
                           rect,
                           drawstr + but->ofs,
                           drawlen,
                           wcol->text,
                           &params,
                           &font_xofs,
                           &font_yofs,
                           nullptr);
 
      if (but->menu_key != '\0') {
        const char *drawstr_ofs = drawstr + but->ofs;
        int ul_index = -1;
 
        {
          /* Find upper case, fall back to lower case. */
          const char *drawstr_end = drawstr_ofs + drawlen;
          const char keys[] = {char(but->menu_key - 32), but->menu_key};
          for (int i = 0; i < ARRAY_SIZE(keys); i++) {
            const char *drawstr_menu = strchr(drawstr_ofs, keys[i]);
            if (drawstr_menu != nullptr && drawstr_menu < drawstr_end) {
              ul_index = int(drawstr_menu - drawstr_ofs);
              break;
            }
          }
        }
 
        if (ul_index != -1) {
          rcti bounds;
          if (BLF_str_offset_to_glyph_bounds(fstyle->uifont_id, drawstr_ofs, ul_index, &bounds) &&
              !BLI_rcti_is_empty(&bounds))
          {
            int ul_width = round_fl_to_int(BLF_width(fstyle->uifont_id, "_", 2));
            int pos_x = rect->xmin + font_xofs + bounds.xmin +
                        (bounds.xmax - bounds.xmin - ul_width) / 2;
            int pos_y = rect->ymin + font_yofs + bounds.ymin - U.pixelsize;
            /* Use text output because direct drawing doesn't always work. See #89246. */
            BLF_position(fstyle->uifont_id, float(pos_x), pos_y, 0.0f);
            BLF_color4ubv(fstyle->uifont_id, wcol->text);
            BLF_draw(fstyle->uifont_id, "_", 2);
          }
        }
      }
    }
  }
 
  /* Show placeholder text if the input is empty and not being edited. */
  if (!drawstr[0] && !but->editstr && ELEM(but->type, ButType::Text, ButType::SearchMenu)) {
    const char *placeholder = ui_but_placeholder_get(but);
    if (placeholder && placeholder[0]) {
      uiFontStyleDraw_Params params{};
      params.align = align;
      uiFontStyle style = *fstyle;
      style.shadow = 0;
      uchar col[4];
      copy_v4_v4_uchar(col, wcol->text);
      col[3] *= 0.33f;
      UI_fontstyle_draw_ex(
          &style, rect, placeholder, strlen(placeholder), col, &params, nullptr, nullptr, nullptr);
    }
  }
 
  /* part text right aligned */
  if (drawstr_right) {
    uchar col[4];
    copy_v4_v4_uchar(col, wcol->text);
    if (use_drawstr_right_as_hint) {
      col[3] *= 0.5f;
    }
 
    rect->xmax -= UI_TEXT_CLIP_MARGIN;
    uiFontStyleDraw_Params params{};
    params.align = UI_STYLE_TEXT_RIGHT;
    UI_fontstyle_draw(fstyle, rect, drawstr_right, UI_MAX_DRAW_STR, col, &params);
  }
}
 
static void widget_draw_extra_icons(const uiWidgetColors *wcol,
                                    uiBut *but,
                                    rcti *rect,
                                    float alpha)
{
  const float icon_size = ICON_SIZE_FROM_BUTRECT(rect);
 
  /* Offset of icons from the right edge. Keep in sync
   * with 'ui_but_extra_operator_icon_mouse_over_get'. */
  if (!BLI_listbase_is_empty(&but->extra_op_icons)) {
    /* Eyeballed. */
    rect->xmax -= 0.2 * icon_size;
  }
 
  /* Inverse order, from right to left. */
  LISTBASE_FOREACH_BACKWARD (uiButExtraOpIcon *, op_icon, &but->extra_op_icons) {
    rcti temp = *rect;
    float alpha_this = alpha;
 
    temp.xmin = temp.xmax - icon_size;
 
    if (op_icon->disabled) {
      alpha_this *= 0.4f;
    }
    else if (!op_icon->highlighted) {
      alpha_this *= 0.75f;
    }
 
    /* Draw the icon at the center, and restore the flags after. */
    const int old_drawflags = but->drawflag;
    UI_but_drawflag_disable(but, UI_BUT_ICON_LEFT);
    widget_draw_icon(but, op_icon->icon, alpha_this, &temp, wcol->text);
    but->drawflag = old_drawflags;
 
    rect->xmax -= icon_size;
  }
}
 
static void widget_draw_node_link_socket(const uiWidgetColors *wcol,
                                         const rcti *rect,
                                         uiBut *but,
                                         float alpha)
{
  /* Node socket pointer can be passed as custom_data, see UI_but_node_link_set(). */
  if (but->custom_data) {
    const float scale = 0.9f / but->block->aspect;
 
    float col[4];
    rgba_uchar_to_float(col, but->col);
    col[3] *= alpha;
 
    GPU_blend(GPU_BLEND_ALPHA);
    UI_widgetbase_draw_cache_flush();
    GPU_blend(GPU_BLEND_NONE);
 
    blender::ed::space_node::node_socket_draw(
        static_cast<bNodeSocket *>(but->custom_data), rect, col, scale);
  }
  else {
    widget_draw_icon(but, ICON_LAYER_USED, alpha, rect, wcol->text);
  }
}
 
/* draws text and icons for buttons */
static void widget_draw_text_icon(const uiFontStyle *fstyle,
                                  const uiWidgetColors *wcol,
                                  uiBut *but,
                                  rcti *rect)
{
  const bool show_menu_icon = ui_but_draw_menu_icon(but);
  const float alpha = float(wcol->text[3]) / 255.0f;
  char password_str[UI_MAX_DRAW_STR];
  bool no_text_padding = but->drawflag & UI_BUT_NO_TEXT_PADDING;
 
  ui_but_text_password_hide(password_str, but, false);
 
  /* check for button text label */
  if (ELEM(but->type, ButType::Menu, ButType::Popover) && (but->flag & UI_BUT_NODE_LINK)) {
    rcti temp = *rect;
    const int size = BLI_rcti_size_y(rect) + 1; /* Not the icon size! */
 
    if (but->drawflag & UI_BUT_ICON_LEFT) {
      temp.xmax = rect->xmin + size;
      rect->xmin = temp.xmax;
      /* Further padding looks off. */
      no_text_padding = true;
    }
    else {
      temp.xmin = rect->xmax - size;
      rect->xmax = temp.xmin;
    }
 
    widget_draw_node_link_socket(wcol, &temp, but, alpha);
  }
 
  const uchar *icon_color = (but->col[3] != 0) ? but->col : wcol->text;
 
  /* If there's an icon too (made with uiDefIconTextBut) then draw the icon
   * and offset the text label to accommodate it */
 
  /* Big previews with optional text label below */
  if (but->flag & UI_BUT_ICON_PREVIEW && ui_block_is_menu(but->block)) {
    const BIFIconID icon = ui_but_icon(but);
    int icon_size = BLI_rcti_size_y(rect);
    int text_size = 0;
 
    /* This is a bit brittle, but avoids adding an 'UI_BUT_HAS_LABEL' flag to but... */
    if (icon_size > BLI_rcti_size_x(rect)) {
      /* button is not square, it has extra height for label */
      text_size = UI_UNIT_Y;
      icon_size -= text_size;
    }
 
    /* draw icon in rect above the space reserved for the label */
    rect->ymin += text_size;
    GPU_blend(GPU_BLEND_ALPHA);
    widget_draw_preview_icon(icon,
                             alpha,
                             but->block->aspect,
                             !(but->drawflag & UI_BUT_NO_PREVIEW_PADDING),
                             rect,
                             icon_color);
    GPU_blend(GPU_BLEND_NONE);
 
    /* offset rect to draw label in */
    rect->ymin -= text_size;
    rect->ymax -= icon_size;
 
    /* vertically centering text */
    rect->ymin += UI_UNIT_Y / 2;
  }
  /* Icons on the left with optional text label on the right */
  else if (but->flag & UI_HAS_ICON || show_menu_icon) {
    const bool is_tool = ((but->icon != ICON_NONE) & UI_but_is_tool(but));
 
    /* XXX add way to draw icons at a different size!
     * Use small icons for popup. */
#ifdef USE_UI_TOOLBAR_HACK
    const float aspect_orig = but->block->aspect;
    if (is_tool && (but->block->flag & UI_BLOCK_POPOVER)) {
      but->block->aspect *= 2.0f;
    }
#endif
 
    const BIFIconID icon = ui_but_icon(but);
    const int icon_size_init = is_tool ? ICON_DEFAULT_HEIGHT_TOOLBAR : ICON_DEFAULT_HEIGHT;
    const float icon_size = icon_size_init / (but->block->aspect * UI_INV_SCALE_FAC);
    const float icon_padding = 2 * UI_SCALE_FAC;
 
#ifdef USE_UI_TOOLBAR_HACK
    if (is_tool) {
      /* pass (even if its a menu toolbar) */
      but->drawflag |= UI_BUT_TEXT_LEFT;
      but->drawflag |= UI_BUT_ICON_LEFT;
    }
#endif
 
    /* menu item - add some more padding so menus don't feel cramped. it must
     * be part of the button so that this area is still clickable */
    if (is_tool) {
      /* pass (even if its a menu toolbar) */
    }
    else if (ui_block_is_pie_menu(but->block)) {
      if (but->emboss == blender::ui::EmbossType::PieMenu) {
        rect->xmin += 0.3f * U.widget_unit;
      }
    }
    /* Menu items, but only if they are not icon-only (rare). */
    else if (ui_block_is_menu(but->block) && but->drawstr[0]) {
      rect->xmin += 0.2f * U.widget_unit;
    }
 
    /* By default icon is the color of text, but can optionally override with but->col. */
    widget_draw_icon(but, icon, alpha, rect, icon_color);
 
    if (show_menu_icon) {
      BLI_assert(but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT);
      widget_draw_submenu_tria(but, rect, wcol);
    }
 
#ifdef USE_UI_TOOLBAR_HACK
    but->block->aspect = aspect_orig;
#endif
 
    rect->xmin += round_fl_to_int(icon_size + icon_padding);
  }
 
  if (!no_text_padding) {
    const int text_padding = round_fl_to_int((UI_TEXT_MARGIN_X * U.widget_unit) /
                                             but->block->aspect);
    if (but->editstr) {
      rect->xmin += text_padding;
    }
    else if (but->flag & UI_BUT_DRAG_MULTI) {
      const bool text_is_edited = ui_but_drag_multi_edit_get(but) != nullptr;
      if (text_is_edited || (but->drawflag & UI_BUT_TEXT_LEFT)) {
        rect->xmin += text_padding;
      }
    }
    else if (but->drawflag & UI_BUT_TEXT_LEFT) {
      rect->xmin += text_padding;
    }
    else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
      rect->xmax -= text_padding;
    }
  }
  else {
    /* In case a separate text label and some other button are placed under each other,
     * and the outline of the button does not contrast with the background.
     * Add an offset (thickness of the outline) so that the text does not stick out visually. */
    if (but->drawflag & UI_BUT_TEXT_LEFT) {
      rect->xmin += U.pixelsize;
    }
    else if (but->drawflag & UI_BUT_TEXT_RIGHT) {
      rect->xmax -= U.pixelsize;
    }
  }
 
  /* Menu contains sub-menu items with triangle icon on their right. Shortcut
   * strings should be drawn with some padding to the right then. */
  if (ui_block_is_menu(but->block) && (but->block->content_hints & UI_BLOCK_CONTAINS_SUBMENU_BUT))
  {
    rect->xmax -= UI_MENU_SUBMENU_PADDING;
  }
 
  /* extra icons, e.g. 'x' icon to clear text or icon for eyedropper */
  widget_draw_extra_icons(wcol, but, rect, alpha);
 
  /* clip but->drawstr to fit in available space */
  if (but->editstr && but->pos >= 0) {
    ui_text_clip_cursor(fstyle, but, rect);
  }
  else if (but->drawstr[0] == '\0') {
    /* bypass text clipping on icon buttons */
    but->ofs = 0;
    but->strwidth = 0;
  }
  else if (ELEM(but->type, ButType::Num, ButType::NumSlider)) {
    ui_text_clip_right_label(fstyle, but, rect);
  }
  else if (but->flag & UI_BUT_HAS_SEP_CHAR) {
    /* Clip middle, but protect in all case right part containing the shortcut, if any. */
    ui_text_clip_middle_protect_right(fstyle, but, rect, UI_SEP_CHAR);
  }
  else {
    ui_text_clip_middle(fstyle, but, rect);
  }
 
  /* Always draw text for text-button cursor. */
  widget_draw_text(fstyle, wcol, but, rect);
 
  ui_but_text_password_hide(password_str, but, true);
 
  /* if a widget uses font shadow it has to be deactivated now */
  BLF_disable(fstyle->uifont_id, BLF_SHADOW);
}
 
#undef UI_TEXT_CLIP_MARGIN

 
/* -------------------------------------------------------------------- */
 
/* put all widget colors on half alpha, use local storage */
static void ui_widget_color_disabled(uiWidgetType *wt, const uiWidgetStateInfo *state)
{
  static uiWidgetColors wcol_theme_s;
 
  wcol_theme_s = *wt->wcol_theme;
 
  const float factor = widget_alpha_factor(state);
 
  wcol_theme_s.outline[3] *= factor;
  wcol_theme_s.outline_sel[3] *= factor;
  wcol_theme_s.inner[3] *= factor;
  wcol_theme_s.inner_sel[3] *= factor;
  wcol_theme_s.item[3] *= factor;
  wcol_theme_s.text[3] *= factor;
  wcol_theme_s.text_sel[3] *= factor;
 
  wt->wcol_theme = &wcol_theme_s;
}
 
static void widget_active_color(uiWidgetColors *wcol)
{
  const bool dark = (srgb_to_grayscale_byte(wcol->text) > srgb_to_grayscale_byte(wcol->inner));
  color_mul_hsl_v3(wcol->inner, 1.0f, 1.15f, dark ? 1.2f : 1.1f);
  color_blend_v4_v4v4(wcol->outline, wcol->outline, wcol->outline_sel, 0.5f);
  color_mul_hsl_v3(wcol->outline_sel, 1.0f, 1.15f, 1.15f);
  color_mul_hsl_v3(wcol->text, 1.0f, 1.15f, dark ? 1.25f : 0.8f);
}
 
static const uchar *widget_color_blend_from_flags(const uiWidgetStateColors *wcol_state,
                                                  const uiWidgetStateInfo *state,
                                                  const blender::ui::EmbossType emboss)
{
  /* Explicitly require #blender::ui::EmbossType::NoneOrStatus for color blending with no emboss.
   */
  if (emboss == blender::ui::EmbossType::None) {
    return nullptr;
  }
 
  if (state->but_drawflag & UI_BUT_ANIMATED_CHANGED) {
    return wcol_state->inner_changed_sel;
  }
  if (state->but_flag & UI_BUT_ANIMATED_KEY) {
    return wcol_state->inner_key_sel;
  }
  if (state->but_flag & UI_BUT_ANIMATED) {
    return wcol_state->inner_anim_sel;
  }
  if (state->but_flag & UI_BUT_DRIVEN) {
    return wcol_state->inner_driven_sel;
  }
  if (state->but_flag & UI_BUT_OVERRIDDEN) {
    return wcol_state->inner_overridden_sel;
  }
  return nullptr;
}
 
/* copy colors from theme, and set changes in it based on state */
static void widget_state(uiWidgetType *wt,
                         const uiWidgetStateInfo *state,
                         blender::ui::EmbossType emboss)
{
  uiWidgetStateColors *wcol_state = wt->wcol_state;
 
  if (state->but_flag & UI_BUT_LIST_ITEM) {
    /* Override default widget's colors. */
    bTheme *btheme = UI_GetTheme();
    wt->wcol_theme = &btheme->tui.wcol_list_item;
 
    if (state->but_flag & (UI_BUT_DISABLED | UI_BUT_INACTIVE | UI_SEARCH_FILTER_NO_MATCH)) {
      ui_widget_color_disabled(wt, state);
    }
  }
 
  wt->wcol = *(wt->wcol_theme);
 
  const uchar *color_blend = widget_color_blend_from_flags(wcol_state, state, emboss);
 
  if (state->but_flag & UI_SELECT) {
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    if (color_blend != nullptr) {
      color_blend_v3_v3(wt->wcol.inner, color_blend, wcol_state->blend);
    }
 
    copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
 
    std::swap(wt->wcol.shadetop, wt->wcol.shadedown);
  }
  else {
    if (state->but_flag & UI_BUT_ACTIVE_DEFAULT) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
      copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
      copy_v4_v4_uchar(wt->wcol.text, wt->wcol.text_sel);
    }
    if (color_blend != nullptr) {
      color_blend_v3_v3(wt->wcol.inner, color_blend, wcol_state->blend);
    }
 
    /* Add "hover" highlight. Ideally this could apply in all cases,
     * even if UI_SELECT. But currently this causes some flickering
     * as buttons can be created and updated without respect to mouse
     * position and so can draw without UI_HOVER set.  See D6503. */
    if (state->but_flag & UI_HOVER) {
      widget_active_color(&wt->wcol);
    }
  }
 
  if (state->but_flag & UI_BUT_REDALERT) {
    if (wt->draw && emboss != blender::ui::EmbossType::None) {
      UI_GetThemeColor3ubv(TH_REDALERT, wt->wcol.inner);
    }
    else {
      uchar red[4];
      UI_GetThemeColor3ubv(TH_REDALERT, red);
      color_mul_hsl_v3(red, 1.0f, 1.5f, 1.5f);
      color_blend_v3_v3(wt->wcol.text, red, 0.5f);
    }
  }
 
  if (state->but_flag & UI_BUT_DRAG_MULTI) {
    /* the button isn't SELECT but we're editing this so draw with sel color */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    std::swap(wt->wcol.shadetop, wt->wcol.shadedown);
    color_blend_v3_v3(wt->wcol.text, wt->wcol.text_sel, 0.85f);
  }
 
  if (state->but_flag & UI_BUT_NODE_ACTIVE) {
    const uchar blue[4] = {86, 128, 194};
    color_blend_v3_v3(wt->wcol.inner, blue, 0.3f);
  }
}

 
/* -------------------------------------------------------------------- */
 
static float widget_radius_from_zoom(const float zoom, const uiWidgetColors *wcol)
{
  return wcol->roundness * U.widget_unit * zoom;
}
 
static float widget_radius_from_rcti(const rcti *rect, const uiWidgetColors *wcol)
{
  return wcol->roundness * BLI_rcti_size_y(rect);
}

 
/* -------------------------------------------------------------------- */
 
static bool draw_emboss(const uiBut *but)
{
  if (but->drawflag & UI_BUT_ALIGN_DOWN) {
    return false;
  }
  uiBut *but_next = but->block->next_but(but);
  if (but->type == ButType::Tab &&
      (BLI_rctf_size_y(&but->block->rect) > BLI_rctf_size_x(&but->block->rect)) &&
      !(but_next == nullptr || but_next->type == ButType::Sepr))
  {
    /* Vertical tabs, emboss at end and before separators. */
    return false;
  }
 
  return true;
}

 
/* -------------------------------------------------------------------- */
 
/* sliders use special hack which sets 'item' as inner when drawing filling */
static void widget_state_numslider(uiWidgetType *wt,
                                   const uiWidgetStateInfo *state,
                                   blender::ui::EmbossType emboss)
{
  uiWidgetStateColors *wcol_state = wt->wcol_state;
 
  /* call this for option button */
  widget_state(wt, state, emboss);
 
  const uchar *color_blend = widget_color_blend_from_flags(wcol_state, state, emboss);
  if (color_blend != nullptr) {
    /* Set the slider 'item' so that it reflects state settings too.
     * De-saturate so the color of the slider doesn't conflict with the blend color,
     * which can make the color hard to see when the slider is set to full (see #66102). */
    wt->wcol.item[0] = wt->wcol.item[1] = wt->wcol.item[2] = srgb_to_grayscale_byte(wt->wcol.item);
    color_blend_v3_v3(wt->wcol.item, color_blend, wcol_state->blend);
    color_ensure_contrast_v3(wt->wcol.item, wt->wcol.inner, 30);
  }
 
  if (state->but_flag & UI_SELECT) {
    std::swap(wt->wcol.shadetop, wt->wcol.shadedown);
  }
}
 
/* labels use theme colors for text */
static void widget_state_option_menu(uiWidgetType *wt,
                                     const uiWidgetStateInfo *state,
                                     blender::ui::EmbossType emboss)
{
  const bTheme *btheme = UI_GetTheme();
 
  const uiWidgetColors *old_wcol = wt->wcol_theme;
  uiWidgetColors wcol_menu_option = *wt->wcol_theme;
 
  /* Override the checkbox theme colors to use the menu-back text colors. */
  copy_v3_v3_uchar(wcol_menu_option.text, btheme->tui.wcol_menu_back.text);
  copy_v3_v3_uchar(wcol_menu_option.text_sel, btheme->tui.wcol_menu_back.text_sel);
  wt->wcol_theme = &wcol_menu_option;
 
  widget_state(wt, state, emboss);
 
  wt->wcol_theme = old_wcol;
}
 
static void widget_state_nothing(uiWidgetType *wt,
                                 const uiWidgetStateInfo * /*state*/,
                                 blender::ui::EmbossType /*emboss*/)
{
  wt->wcol = *(wt->wcol_theme);
}
 
/* special case, button that calls pulldown */
static void widget_state_pulldown(uiWidgetType *wt,
                                  const uiWidgetStateInfo * /*state*/,
                                  blender::ui::EmbossType /*emboss*/)
{
  wt->wcol = *(wt->wcol_theme);
}
 
/* special case, pie menu items */
static void widget_state_pie_menu_item(uiWidgetType *wt,
                                       const uiWidgetStateInfo *state,
                                       blender::ui::EmbossType /*emboss*/)
{
  wt->wcol = *(wt->wcol_theme);
 
  if ((state->but_flag & UI_BUT_DISABLED) && (state->but_flag & UI_HOVER)) {
    color_blend_v3_v3(wt->wcol.text, wt->wcol.text_sel, 0.5f);
    color_blend_v3_v3(wt->wcol.outline, wt->wcol.outline_sel, 0.5f);
    /* draw the backdrop at low alpha, helps navigating with keys
     * when disabled items are active */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.item);
    wt->wcol.inner[3] = 64;
  }
  else {
    /* regular active */
    if (state->but_flag & (UI_SELECT | UI_HOVER)) {
      copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
      copy_v3_v3_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    }
    else if (state->but_flag & (UI_BUT_DISABLED | UI_BUT_INACTIVE)) {
      /* regular disabled */
      color_blend_v3_v3(wt->wcol.text, wt->wcol.inner, 0.5f);
    }
 
    if (state->but_flag & UI_SELECT) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
      copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    }
    else if (state->but_flag & UI_HOVER) {
      copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.item);
      color_blend_v3_v3(wt->wcol.outline, wt->wcol.outline_sel, 0.5f);
    }
  }
}
 
/* special case, menu items */
static void widget_state_menu_item(uiWidgetType *wt,
                                   const uiWidgetStateInfo *state,
                                   blender::ui::EmbossType /*emboss*/)
{
  wt->wcol = *(wt->wcol_theme);
 
  if ((state->but_flag & UI_BUT_DISABLED) && (state->but_flag & UI_HOVER)) {
    /* Hovering over disabled item. */
    wt->wcol.text[3] = 128;
    color_blend_v3_v3(wt->wcol.inner, wt->wcol.text, 0.5f);
    wt->wcol.inner[3] = 64;
  }
  else if (state->but_flag & UI_BUT_DISABLED) {
    /* Regular disabled. */
    wt->wcol.text[3] = 128;
  }
  else if (state->but_flag & UI_BUT_INACTIVE) {
    /* Inactive. */
    if (state->but_flag & UI_HOVER) {
      color_blend_v3_v3(wt->wcol.inner, wt->wcol.text, 0.2f);
      copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
      wt->wcol.inner[3] = 255;
    }
    color_blend_v3_v3(wt->wcol.text, wt->wcol.inner, 0.5f);
  }
  else if (state->but_flag & (UI_BUT_ACTIVE_DEFAULT | UI_SELECT_DRAW)) {
    /* Currently-selected item. */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    copy_v4_v4_uchar(wt->wcol.text, wt->wcol.text_sel);
  }
  else if ((state->but_flag & (UI_SELECT | UI_BUT_ICON_PREVIEW)) ==
           (UI_SELECT | UI_BUT_ICON_PREVIEW))
  {
    /* Currently-selected list or menu item that is large icon preview. */
    copy_v4_v4_uchar(wt->wcol.inner, wt->wcol.inner_sel);
    copy_v4_v4_uchar(wt->wcol.outline, wt->wcol.outline_sel);
    copy_v4_v4_uchar(wt->wcol.text, wt->wcol.text_sel);
  }
  else if (state->but_flag & UI_HOVER) {
    /* Regular hover. */
    color_blend_v3_v3(wt->wcol.inner, wt->wcol.text, 0.2f);
    color_blend_v3_v3(wt->wcol.outline, wt->wcol.outline_sel, 0.5f);
    copy_v3_v3_uchar(wt->wcol.text, wt->wcol.text_sel);
    wt->wcol.inner[3] = 255;
    wt->wcol.text[3] = 255;
  }
  /* Subtle background for larger preview buttons, so text and icons feel connected (esp. for while
   * previews are loading still and a loading icon is displayed). */
  else if (state->but_flag & UI_BUT_ICON_PREVIEW) {
    copy_v3_v3_uchar(wt->wcol.inner, wt->wcol.text);
    wt->wcol.inner[3] = 11;
  }
}

 
/* -------------------------------------------------------------------- */
 
/* outside of rect, rad to left/bottom/right */
static void widget_softshadow(const rcti *rect, int roundboxalign, const float radin)
{
  const float outline = U.pixelsize;
 
  rctf shadow_rect;
  BLI_rctf_rcti_copy(&shadow_rect, rect);
  BLI_rctf_pad(&shadow_rect, -outline, -outline);
 
  UI_draw_roundbox_corner_set(roundboxalign);
 
  const float shadow_alpha = UI_GetTheme()->tui.menu_shadow_fac;
  const float shadow_width = UI_ThemeMenuShadowWidth();
 
  ui_draw_dropshadow(&shadow_rect, radin, shadow_width, 1.0f, shadow_alpha);
}
 
static void widget_menu_back(uiWidgetColors *wcol,
                             const rcti *rect,
                             const int block_flag,
                             const int direction,
                             const float zoom)
{
  uiWidgetBase wtb;
  int roundboxalign = UI_CNR_ALL;
 
  widget_init(&wtb);
 
  /* menu is 2nd level or deeper */
  if (block_flag & UI_BLOCK_POPUP) {
    // rect->ymin -= 4.0;
    // rect->ymax += 4.0;
  }
  else if (direction & (UI_DIR_DOWN | UI_DIR_UP)) {
    if (direction & UI_DIR_DOWN) {
      roundboxalign = (UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
    }
    else {
      roundboxalign = (UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT);
    }
    /* Corner rounding based on secondary direction. */
    if (direction & UI_DIR_LEFT) {
      roundboxalign |= (UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
    }
    if (direction & UI_DIR_RIGHT) {
      roundboxalign |= (UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
    }
  }
 
  GPU_blend(GPU_BLEND_ALPHA);
  const float radius = widget_radius_from_zoom(zoom, wcol);
  widget_softshadow(rect, roundboxalign, radius);
 
  round_box_edges(&wtb, roundboxalign, rect, radius);
  wtb.draw_emboss = false;
  widgetbase_draw(&wtb, wcol);
 
  GPU_blend(GPU_BLEND_NONE);
}
 
static void ui_hsv_cursor(const float x,
                          const float y,
                          const float zoom,
                          const float rgb[3],
                          const float hsv[3],
                          const bool is_active)
{
  /* Draw the circle larger while the mouse button is pressed down. */
  const float radius = zoom * (((is_active ? 20.0f : 12.0f) * UI_SCALE_FAC) + U.pixelsize);
 
  GPU_blend(GPU_BLEND_ALPHA);
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  GPU_program_point_size(true);
  immBindBuiltinProgram(GPU_SHADER_2D_POINT_UNIFORM_SIZE_UNIFORM_COLOR_OUTLINE_AA);
  immUniformColor3fv(rgb);
  immUniform1f("outlineWidth", U.pixelsize);
 
  /* Alpha of outline colors just strong enough to give good contrast. */
  const float fg = std::min(1.0f - hsv[2] + 0.2f, 0.8f);
  const float bg = hsv[2] / 2.0f;
 
  immUniform4f("outlineColor", 0.0f, 0.0f, 0.0f, bg);
  immUniform1f("size", radius);
  immBegin(GPU_PRIM_POINTS, 1);
  immVertex2f(pos, x, y);
  immEnd();
 
  immUniform4f("outlineColor", 1.0f, 1.0f, 1.0f, fg);
  immUniform1f("size", radius - 1.0f);
  immBegin(GPU_PRIM_POINTS, 1);
  immVertex2f(pos, x, y);
  immEnd();
 
  immUnbindProgram();
  GPU_program_point_size(false);
  GPU_blend(GPU_BLEND_NONE);
}
 
void ui_hsvcircle_vals_from_pos(
    const rcti *rect, const float mx, const float my, float *r_val_rad, float *r_val_dist)
{
  /* duplication of code... well, simple is better now */
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = float(min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect))) / 2.0f;
  const float m_delta[2] = {mx - centx, my - centy};
  const float dist_sq = len_squared_v2(m_delta);
 
  *r_val_dist = (dist_sq < (radius * radius)) ? sqrtf(dist_sq) / radius : 1.0f;
  *r_val_rad = atan2f(m_delta[0], m_delta[1]) / (2.0f * float(M_PI)) + 0.5f;
}
 
void ui_hsvcircle_pos_from_vals(
    const ColorPicker *cpicker, const rcti *rect, const float *hsv, float *r_xpos, float *r_ypos)
{
  /* duplication of code... well, simple is better now */
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = float(min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect))) / 2.0f;
 
  const float ang = 2.0f * float(M_PI) * hsv[0] + float(M_PI_2);
 
  float radius_t;
  if (cpicker->use_color_cubic && (U.color_picker_type == USER_CP_CIRCLE_HSV)) {
    radius_t = (1.0f - pow3f(1.0f - hsv[1]));
  }
  else {
    radius_t = hsv[1];
  }
 
  const float rad = clamp_f(radius_t, 0.0f, 1.0f) * radius;
  *r_xpos = centx + cosf(-ang) * rad;
  *r_ypos = centy + sinf(-ang) * rad;
}
 
static void ui_draw_but_HSVCIRCLE(uiBut *but, const uiWidgetColors *wcol, const rcti *rect)
{
  /* TODO(merwin): reimplement as shader for pixel-perfect colors */
 
  const int tot = 64;
  const float radstep = 2.0f * float(M_PI) / float(tot);
  const float centx = BLI_rcti_cent_x_fl(rect);
  const float centy = BLI_rcti_cent_y_fl(rect);
  const float radius = float(min_ii(BLI_rcti_size_x(rect), BLI_rcti_size_y(rect))) / 2.0f;
 
  ColorPicker *cpicker = static_cast<ColorPicker *>(but->custom_data);
  float rgb[3], hsv[3], rgb_center[3], rgb_perceptual[3];
  const bool is_color_gamma = ui_but_is_color_gamma(but);
 
  /* Initialize for compatibility. */
  copy_v3_v3(hsv, cpicker->hsv_perceptual);
 
  /* Compute current hue. */
  ui_but_v3_get(but, rgb);
  copy_v3_v3(rgb_perceptual, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb_perceptual);
  ui_color_picker_rgb_to_hsv_compat(rgb_perceptual, hsv);
 
  if (!is_color_gamma) {
    ui_block_cm_to_display_space_v3(but->block, rgb);
  }
 
  CLAMP(hsv[2], 0.0f, 1.0f); /* for display only */
 
  /* exception: if 'lock' is set
   * lock the value of the color wheel to 1.
   * Useful for color correction tools where you're only interested in hue. */
  if (cpicker->use_color_lock) {
    if (U.color_picker_type == USER_CP_CIRCLE_HSV) {
      hsv[2] = 1.0f;
    }
    else {
      hsv[2] = 0.5f;
    }
  }
 
  const float hsv_center[3] = {0.0f, 0.0f, hsv[2]};
  ui_color_picker_hsv_to_rgb(hsv_center, rgb_center);
  ui_perceptual_to_scene_linear_space(but, rgb_center);
 
  if (!is_color_gamma) {
    ui_block_cm_to_display_space_v3(but->block, rgb_center);
  }
 
  GPUVertFormat *format = immVertexFormat();
  uint pos = GPU_vertformat_attr_add(format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  const uint color = GPU_vertformat_attr_add(
      format, "color", blender::gpu::VertAttrType::SFLOAT_32_32_32);
 
  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
  immBegin(GPU_PRIM_TRI_FAN, tot + 2);
  immAttr3fv(color, rgb_center);
  immVertex2f(pos, centx, centy);
 
  float ang = 0.0f;
  for (int a = 0; a <= tot; a++, ang += radstep) {
    const float si = sinf(ang);
    const float co = cosf(ang);
    float hsv_ang[3];
    float rgb_ang[3];
 
    ui_hsvcircle_vals_from_pos(
        rect, centx + co * radius, centy + si * radius, hsv_ang, hsv_ang + 1);
    hsv_ang[2] = hsv[2];
 
    ui_color_picker_hsv_to_rgb(hsv_ang, rgb_ang);
    ui_perceptual_to_scene_linear_space(but, rgb_ang);
 
    if (!is_color_gamma) {
      ui_block_cm_to_display_space_v3(but->block, rgb_ang);
    }
 
    immAttr3fv(color, rgb_ang);
    immVertex2f(pos, centx + co * radius, centy + si * radius);
  }
  immEnd();
  immUnbindProgram();
 
  /* fully rounded outline */
  format = immVertexFormat();
  pos = GPU_vertformat_attr_add(format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
 
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
  GPU_blend(GPU_BLEND_ALPHA);
  GPU_line_smooth(true);
 
  immUniformColor3ubv(wcol->outline);
  imm_draw_circle_wire_2d(pos, centx, centy, radius, tot);
 
  immUnbindProgram();
 
  GPU_blend(GPU_BLEND_NONE);
  GPU_line_smooth(false);
 
  /* cursor */
  copy_v3_v3(hsv, cpicker->hsv_perceptual);
  ui_color_picker_rgb_to_hsv_compat(rgb_perceptual, hsv);
 
  float xpos, ypos;
  ui_hsvcircle_pos_from_vals(cpicker, rect, hsv, &xpos, &ypos);
  const float zoom = 1.0f / but->block->aspect;
  ui_hsv_cursor(xpos, ypos, zoom, rgb, hsv, but->flag & UI_SELECT);
}

 
/* -------------------------------------------------------------------- */
 
static void ui_draw_gradient_hsv_to_rgb(
    const ColorManagedDisplay *display, float h, float s, float v, float rgb[3])
{
  hsv_to_rgb(h, s, v, rgb, rgb + 1, rgb + 2);
 
  if (display) {
    IMB_colormanagement_color_picking_to_scene_linear_v3(rgb, rgb);
    IMB_colormanagement_scene_linear_to_display_v3(rgb, display);
  }
}
 
void ui_draw_gradient(const rcti *rect,
                      const float hsv[3],
                      const eButGradientType type,
                      const float alpha,
                      const ColorManagedDisplay *display)
{
  /* allows for 4 steps (red->yellow) */
  const int steps = 48;
  const float color_step = 1.0f / steps;
  int a;
  const float h = hsv[0], s = hsv[1], v = hsv[2];
  float dx, dy, sx1, sx2, sy;
  float col0[4][3]; /* left half, rect bottom to top */
  float col1[4][3]; /* right half, rect bottom to top */
 
  /* draw series of gouraud rects */
 
  switch (type) {
    case UI_GRAD_SV:
      ui_draw_gradient_hsv_to_rgb(display, h, 0.0, 0.0, col1[0]);
      ui_draw_gradient_hsv_to_rgb(display, h, 0.0, 0.333, col1[1]);
      ui_draw_gradient_hsv_to_rgb(display, h, 0.0, 0.666, col1[2]);
      ui_draw_gradient_hsv_to_rgb(display, h, 0.0, 1.0, col1[3]);
      break;
    case UI_GRAD_HV:
      ui_draw_gradient_hsv_to_rgb(display, 0.0, s, 0.0, col1[0]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, s, 0.333, col1[1]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, s, 0.666, col1[2]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, s, 1.0, col1[3]);
      break;
    case UI_GRAD_HS:
      ui_draw_gradient_hsv_to_rgb(display, 0.0, 0.0, v, col1[0]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, 0.333, v, col1[1]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, 0.666, v, col1[2]);
      ui_draw_gradient_hsv_to_rgb(display, 0.0, 1.0, v, col1[3]);
      break;
    case UI_GRAD_H:
      ui_draw_gradient_hsv_to_rgb(display, 0.0, 1.0, 1.0, col1[0]);
      copy_v3_v3(col1[1], col1[0]);
      copy_v3_v3(col1[2], col1[0]);
      copy_v3_v3(col1[3], col1[0]);
      break;
    case UI_GRAD_S:
      ui_draw_gradient_hsv_to_rgb(display, 1.0, 0.0, 1.0, col1[1]);
      copy_v3_v3(col1[0], col1[1]);
      copy_v3_v3(col1[2], col1[1]);
      copy_v3_v3(col1[3], col1[1]);
      break;
    case UI_GRAD_V:
      ui_draw_gradient_hsv_to_rgb(display, 1.0, 1.0, 0.0, col1[2]);
      copy_v3_v3(col1[0], col1[2]);
      copy_v3_v3(col1[1], col1[2]);
      copy_v3_v3(col1[3], col1[2]);
      break;
    default:
      BLI_assert_msg(0, "invalid 'type' argument");
      ui_draw_gradient_hsv_to_rgb(display, 1.0, 1.0, 1.0, col1[2]);
      copy_v3_v3(col1[0], col1[2]);
      copy_v3_v3(col1[1], col1[2]);
      copy_v3_v3(col1[3], col1[2]);
      break;
  }
 
  /* old below */
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(
      format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  const uint col = GPU_vertformat_attr_add(
      format, "color", blender::gpu::VertAttrType::SFLOAT_32_32_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
 
  immBegin(GPU_PRIM_TRIS, steps * 3 * 6);
 
  /* 0.999 = prevent float inaccuracy for steps */
  for (dx = 0.0f; dx < 0.999f; dx += color_step) {
    const float dx_next = dx + color_step;
 
    /* previous color */
    copy_v3_v3(col0[0], col1[0]);
    copy_v3_v3(col0[1], col1[1]);
    copy_v3_v3(col0[2], col1[2]);
    copy_v3_v3(col0[3], col1[3]);
 
    /* new color */
    switch (type) {
      case UI_GRAD_SV:
        ui_draw_gradient_hsv_to_rgb(display, h, dx, 0.0, col1[0]);
        ui_draw_gradient_hsv_to_rgb(display, h, dx, 0.333, col1[1]);
        ui_draw_gradient_hsv_to_rgb(display, h, dx, 0.666, col1[2]);
        ui_draw_gradient_hsv_to_rgb(display, h, dx, 1.0, col1[3]);
        break;
      case UI_GRAD_HV:
        ui_draw_gradient_hsv_to_rgb(display, dx_next, s, 0.0, col1[0]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, s, 0.333, col1[1]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, s, 0.666, col1[2]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, s, 1.0, col1[3]);
        break;
      case UI_GRAD_HS:
        ui_draw_gradient_hsv_to_rgb(display, dx_next, 0.0, v, col1[0]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, 0.333, v, col1[1]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, 0.666, v, col1[2]);
        ui_draw_gradient_hsv_to_rgb(display, dx_next, 1.0, v, col1[3]);
        break;
      case UI_GRAD_H:
        /* annoying but without this the color shifts - could be solved some other way
         * - campbell */
        ui_draw_gradient_hsv_to_rgb(display, dx_next, 1.0, 1.0, col1[0]);
        copy_v3_v3(col1[1], col1[0]);
        copy_v3_v3(col1[2], col1[0]);
        copy_v3_v3(col1[3], col1[0]);
        break;
      case UI_GRAD_S:
        ui_draw_gradient_hsv_to_rgb(display, h, dx, 1.0, col1[1]);
        copy_v3_v3(col1[0], col1[1]);
        copy_v3_v3(col1[2], col1[1]);
        copy_v3_v3(col1[3], col1[1]);
        break;
      case UI_GRAD_V:
        ui_draw_gradient_hsv_to_rgb(display, h, 1.0, dx, col1[2]);
        copy_v3_v3(col1[0], col1[2]);
        copy_v3_v3(col1[1], col1[2]);
        copy_v3_v3(col1[3], col1[2]);
        break;
      default:
        break;
    }
 
    /* rect */
    sx1 = rect->xmin + dx * BLI_rcti_size_x(rect);
    sx2 = rect->xmin + dx_next * BLI_rcti_size_x(rect);
    sy = rect->ymin;
    dy = float(BLI_rcti_size_y(rect)) / 3.0f;
 
    for (a = 0; a < 3; a++, sy += dy) {
      immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
      immVertex2f(pos, sx1, sy);
 
      immAttr4f(col, col1[a][0], col1[a][1], col1[a][2], alpha);
      immVertex2f(pos, sx2, sy);
 
      immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
      immVertex2f(pos, sx2, sy + dy);
 
      immAttr4f(col, col0[a][0], col0[a][1], col0[a][2], alpha);
      immVertex2f(pos, sx1, sy);
 
      immAttr4f(col, col1[a + 1][0], col1[a + 1][1], col1[a + 1][2], alpha);
      immVertex2f(pos, sx2, sy + dy);
 
      immAttr4f(col, col0[a + 1][0], col0[a + 1][1], col0[a + 1][2], alpha);
      immVertex2f(pos, sx1, sy + dy);
    }
  }
  immEnd();
 
  immUnbindProgram();
}
 
void ui_hsvcube_pos_from_vals(
    const uiButHSVCube *hsv_but, const rcti *rect, const float *hsv, float *r_xp, float *r_yp)
{
  float x = 0.0f, y = 0.0f;
 
  switch (hsv_but->gradient_type) {
    case UI_GRAD_SV:
      x = hsv[1];
      y = hsv[2];
      break;
    case UI_GRAD_HV:
      x = hsv[0];
      y = hsv[2];
      break;
    case UI_GRAD_HS:
      x = hsv[0];
      y = hsv[1];
      break;
    case UI_GRAD_H:
      x = hsv[0];
      y = 0.5;
      break;
    case UI_GRAD_S:
      x = hsv[1];
      y = 0.5;
      break;
    case UI_GRAD_V:
      x = hsv[2];
      y = 0.5;
      break;
    case UI_GRAD_L_ALT:
      x = 0.5f;
      /* exception only for value strip - use the range set in but->min/max */
      y = hsv[2];
      break;
    case UI_GRAD_V_ALT:
      x = 0.5f;
      /* exception only for value strip - use the range set in but->min/max */
      y = (hsv[2] - hsv_but->softmin) / (hsv_but->softmax - hsv_but->softmin);
      break;
    case UI_GRAD_NONE:
      BLI_assert_unreachable();
  }
 
  /* cursor */
  *r_xp = rect->xmin + x * BLI_rcti_size_x(rect);
  *r_yp = rect->ymin + y * BLI_rcti_size_y(rect);
}
 
static void ui_draw_but_HSVCUBE(uiBut *but, const rcti *rect)
{
  const uiButHSVCube *hsv_but = (uiButHSVCube *)but;
  float rgb[3], rgb_perceptual[3];
  float x = 0.0f, y = 0.0f;
  const ColorManagedDisplay *display = ui_block_cm_display_get(but->block);
  ColorPicker *cpicker = static_cast<ColorPicker *>(but->custom_data);
  float *hsv = cpicker->hsv_perceptual;
  float hsv_n[3];
 
  /* Is this the larger color canvas or narrow color slider? */
  bool is_canvas = ELEM(hsv_but->gradient_type, UI_GRAD_SV, UI_GRAD_HV, UI_GRAD_HS);
 
  /* Initialize for compatibility. */
  copy_v3_v3(hsv_n, hsv);
 
  ui_but_v3_get(but, rgb);
  copy_v3_v3(rgb_perceptual, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb_perceptual);
  rgb_to_hsv_compat_v(rgb_perceptual, hsv_n);
 
  if (!ui_but_is_color_gamma(but)) {
    ui_block_cm_to_display_space_v3(but->block, rgb);
  }
 
  ui_draw_gradient(rect, hsv_n, hsv_but->gradient_type, 1.0f, display);
 
  ui_hsvcube_pos_from_vals(hsv_but, rect, hsv_n, &x, &y);
 
  const float zoom = 1.0f / but->block->aspect;
 
  /* outline */
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
  immUniformColor3ub(0, 0, 0);
  imm_draw_box_wire_2d(pos, (rect->xmin), (rect->ymin), (rect->xmax), (rect->ymax));
  immUnbindProgram();
 
  if (is_canvas) {
    /* Round cursor in the large square area. */
    float margin = (4.0f * UI_SCALE_FAC);
    CLAMP(x, rect->xmin + margin, rect->xmax - margin);
    CLAMP(y, rect->ymin + margin, rect->ymax - margin);
    ui_hsv_cursor(x, y, zoom, rgb, hsv, but->flag & UI_SELECT);
  }
  else {
    /* Square indicator in the narrow area. */
    rctf rectf;
    BLI_rctf_rcti_copy(&rectf, rect);
    const float margin = (2.0f * UI_SCALE_FAC);
    CLAMP(x, rect->xmin + margin, rect->xmax - margin);
    CLAMP(y, rect->ymin + margin, rect->ymax - margin);
    rectf.ymax += 1;
    const float cursor_width = std::max(BLI_rctf_size_y(&rectf) * 0.35f, 1.0f);
    rectf.xmin = x - cursor_width;
    rectf.xmax = x + cursor_width;
 
    if (but->flag & UI_SELECT) {
      /* Make the indicator larger while the mouse button is pressed. */
      rectf.xmin -= U.pixelsize;
      rectf.xmax += U.pixelsize;
      rectf.ymin -= U.pixelsize;
      rectf.ymax += U.pixelsize;
    }
 
    const float col[4] = {0.0f, 0.0f, 0.0f, 1.0f};
    UI_draw_roundbox_4fv(&rectf, false, 0, col);
 
    rectf.xmin += 1.0f;
    rectf.xmax -= 1.0f;
    const float inner[4] = {1.0f, 1.0f, 1.0f, 1.0f};
    const float col2[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    UI_draw_roundbox_4fv_ex(&rectf, col2, nullptr, 0.0f, inner, U.pixelsize, 0.0f);
  }
}
 
/* vertical 'value' slider, using new widget code */
static void ui_draw_but_HSV_v(uiBut *but, const rcti *rect)
{
  const uiButHSVCube *hsv_but = (uiButHSVCube *)but;
  float rgb[3], hsv[3], v;
 
  ui_but_v3_get(but, rgb);
  ui_scene_linear_to_perceptual_space(but, rgb);
 
  if (hsv_but->gradient_type == UI_GRAD_L_ALT) {
    rgb_to_hsl_v(rgb, hsv);
  }
  else {
    rgb_to_hsv_v(rgb, hsv);
  }
  v = hsv[2];
 
  /* map v from property range to [0,1] */
  if (hsv_but->gradient_type == UI_GRAD_V_ALT) {
    const float min = but->softmin, max = but->softmax;
    v = (v - min) / (max - min);
  }
 
  rctf rectf;
  BLI_rctf_rcti_copy(&rectf, rect);
 
  const float inner1[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  const float inner2[4] = {0.0f, 0.0f, 0.0f, 1.0f};
  const float outline[4] = {0.0f, 0.0f, 0.0f, 1.0f};
 
  const float outline_width = (BLI_rctf_size_x(&rectf) < 4.0f) ? 0.0f : 1.0f;
  UI_draw_roundbox_4fv_ex(&rectf, inner1, inner2, U.pixelsize, outline, outline_width, 0.0f);
 
  /* cursor */
  float y = rect->ymin + v * BLI_rcti_size_y(rect);
  CLAMP(y, float(rect->ymin) + (2.0f * UI_SCALE_FAC), float(rect->ymax) - (2.0f * UI_SCALE_FAC));
  const float cursor_height = std::max(BLI_rctf_size_x(&rectf) * 0.35f, 1.0f);
  rectf.ymin = y - cursor_height;
  rectf.ymax = y + cursor_height;
  float col[4] = {0.0f, 0.0f, 0.0f, 1.0f};
 
  if (but->flag & UI_SELECT) {
    /* Enlarge the indicator while the mouse button is pressed down. */
    rectf.xmin -= U.pixelsize;
    rectf.xmax += U.pixelsize;
    rectf.ymin -= U.pixelsize;
    rectf.ymax += U.pixelsize;
  }
 
  UI_draw_roundbox_4fv(&rectf, false, 0.0f, col);
 
  rectf.ymin += 1.0f;
  rectf.ymax -= 1.0f;
  const float col2[4] = {v, v, v, 1.0f};
  UI_draw_roundbox_4fv_ex(&rectf, col2, nullptr, 0.0f, inner1, U.pixelsize, 0.0f);
}

static void ui_draw_separator(const uiWidgetColors *wcol, uiBut *but, const rcti *rect)
{
  const uiButSeparatorLine *but_line = static_cast<uiButSeparatorLine *>(but);
  const bool vertical = but_line->is_vertical;
  const int mid = vertical ? BLI_rcti_cent_x(rect) : BLI_rcti_cent_y(rect);
  const uchar col[4] = {
      wcol->text[0],
      wcol->text[1],
      wcol->text[2],
      30,
  };
 
  const uint pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
  GPU_blend(GPU_BLEND_ALPHA);
  immUniformColor4ubv(col);
  GPU_line_width(1.0f);
 
  immBegin(GPU_PRIM_LINES, 2);
 
  if (vertical) {
    immVertex2f(pos, mid, rect->ymin);
    immVertex2f(pos, mid, rect->ymax);
  }
  else {
    immVertex2f(pos, rect->xmin, mid);
    immVertex2f(pos, rect->xmax, mid);
  }
 
  immEnd();
 
  GPU_blend(GPU_BLEND_NONE);
 
  immUnbindProgram();
}

 
/* -------------------------------------------------------------------- */
 
#define NUM_BUT_PADDING_FACTOR 0.425f
 
static void widget_numbut_draw(const uiBut *but,
                               uiWidgetColors *wcol,
                               rcti *rect,
                               const float zoom,
                               const uiWidgetStateInfo *state,
                               int roundboxalign,
                               bool emboss)
{
  const float rad = widget_radius_from_zoom(zoom, wcol);
  const int handle_width = min_ii(BLI_rcti_size_x(rect) / 3, BLI_rcti_size_y(rect) * 0.7f);
 
  if (state->but_flag & UI_SELECT) {
    std::swap(wcol->shadetop, wcol->shadedown);
  }
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  if (!emboss) {
    round_box_edges(&wtb, roundboxalign, rect, rad);
  }
  else {
    wtb.draw_inner = false;
    wtb.draw_outline = false;
  }
 
  /* decoration */
  if (((state->but_flag & UI_HOVER) || (U.uiflag2 & USER_ALWAYS_SHOW_NUMBER_ARROWS)) &&
      !state->is_text_input)
  {
    uiWidgetColors wcol_zone;
    uiWidgetBase wtb_zone;
    rcti rect_zone;
    int roundboxalign_zone;
 
    /* left arrow zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;
 
    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if (!(state->but_flag & UI_HOVER)) {
      wcol_zone.item[3] = 180;
    }
    if (state->but_drawflag & UI_BUT_HOVER_LEFT) {
      widget_active_color(&wcol_zone);
    }
 
    rect_zone = *rect;
    rect_zone.xmax = rect->xmin + handle_width + U.pixelsize;
    roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
    round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);
 
    shape_preset_init_number_arrows(&wtb_zone.tria1, &rect_zone, 0.6f, 'l');
    widgetbase_draw(&wtb_zone, &wcol_zone);
 
    /* right arrow zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;
    wtb_zone.tria1.type = ROUNDBOX_TRIA_ARROWS;
 
    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if (!(state->but_flag & UI_HOVER)) {
      wcol_zone.item[3] = 180;
    }
    if (state->but_drawflag & UI_BUT_HOVER_RIGHT) {
      widget_active_color(&wcol_zone);
    }
 
    rect_zone = *rect;
    rect_zone.xmin = rect->xmax - handle_width - U.pixelsize;
    roundboxalign_zone = roundboxalign & ~(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
    round_box_edges(&wtb_zone, roundboxalign_zone, &rect_zone, rad);
 
    shape_preset_init_number_arrows(&wtb_zone.tria2, &rect_zone, 0.6f, 'r');
    widgetbase_draw(&wtb_zone, &wcol_zone);
 
    /* middle highlight zone */
    widget_init(&wtb_zone);
    wtb_zone.draw_outline = false;
    wtb_zone.draw_emboss = false;
 
    wcol_zone = *wcol;
    copy_v3_v3_uchar(wcol_zone.item, wcol->text);
    if ((state->but_flag & UI_HOVER) &&
        !(state->but_drawflag & (UI_BUT_HOVER_LEFT | UI_BUT_HOVER_RIGHT)))
    {
      widget_active_color(&wcol_zone);
    }
 
    rect_zone = *rect;
    rect_zone.xmin = rect->xmin + handle_width - U.pixelsize;
    rect_zone.xmax = rect->xmax - handle_width + U.pixelsize;
    round_box_edges(&wtb_zone, 0, &rect_zone, 0);
    widgetbase_draw(&wtb_zone, &wcol_zone);
 
    /* outline */
    wtb.draw_inner = false;
    wtb.draw_emboss = draw_emboss(but);
    widgetbase_draw(&wtb, wcol);
  }
  else {
    /* inner and outline */
    wtb.draw_emboss = draw_emboss(but);
    widgetbase_draw(&wtb, wcol);
  }
 
  if (!state->is_text_input) {
    const float text_padding = NUM_BUT_PADDING_FACTOR * BLI_rcti_size_y(rect);
 
    rect->xmin += text_padding;
    rect->xmax -= text_padding;
  }
}
 
static void widget_numbut(uiBut *but,
                          uiWidgetColors *wcol,
                          rcti *rect,
                          const uiWidgetStateInfo *state,
                          int roundboxalign,
                          const float zoom)
{
  widget_numbut_draw(but, wcol, rect, zoom, state, roundboxalign, false);
}
 
static void widget_menubut(uiWidgetColors *wcol,
                           rcti *rect,
                           const uiWidgetStateInfo *state,
                           int roundboxalign,
                           const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  /* decoration */
  shape_preset_trias_from_rect_menu(&wtb.tria1, rect);
  /* copy size and center to 2nd tria */
  wtb.tria2 = wtb.tria1;
 
  if (ELEM(state->emboss, blender::ui::EmbossType::NoneOrStatus, blender::ui::EmbossType::None)) {
    wtb.draw_inner = false;
    wtb.draw_outline = false;
    wtb.draw_emboss = false;
  }
 
  widgetbase_draw(&wtb, wcol);
 
  /* text space, arrows are about 0.6 height of button */
  rect->xmax -= (6 * BLI_rcti_size_y(rect)) / 10;
}

static void widget_menubut_embossn(const uiBut * /*but*/,
                                   uiWidgetColors *wcol,
                                   rcti *rect,
                                   const uiWidgetStateInfo * /*state*/,
                                   int /*roundboxalign*/)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
  wtb.draw_inner = false;
  wtb.draw_outline = false;
 
  /* decoration */
  shape_preset_trias_from_rect_menu(&wtb.tria1, rect);
  /* copy size and center to 2nd tria */
  wtb.tria2 = wtb.tria1;
 
  widgetbase_draw(&wtb, wcol);
}

static void widget_numbut_embossn(const uiBut *but,
                                  uiWidgetColors *wcol,
                                  rcti *rect,
                                  const uiWidgetStateInfo *state,
                                  int roundboxalign,
                                  const float zoom)
{
  widget_numbut_draw(but, wcol, rect, zoom, state, roundboxalign, true);
}
 
void UI_draw_widget_scroll(uiWidgetColors *wcol, const rcti *rect, const rcti *slider, int state)
{
  uiWidgetBase wtb;
 
  widget_init(&wtb);
 
  /* determine horizontal/vertical */
  const bool horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));
 
  const float rad = (horizontal) ? wcol->roundness * BLI_rcti_size_y(rect) :
                                   wcol->roundness * BLI_rcti_size_x(rect);
 
  wtb.uniform_params.shade_dir = (horizontal) ? 1.0f : 0.0;
 
  /* draw back part, colors swapped and shading inverted */
  if (horizontal) {
    std::swap(wcol->shadetop, wcol->shadedown);
  }
 
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
  widgetbase_draw(&wtb, wcol);
 
  /* slider */
  if ((BLI_rcti_size_x(slider) < 2) || (BLI_rcti_size_y(slider) < 2)) {
    /* pass */
  }
  else {
    std::swap(wcol->shadetop, wcol->shadedown);
 
    copy_v4_v4_uchar(wcol->inner, wcol->item);
 
    if (wcol->shadetop > wcol->shadedown) {
      wcol->shadetop += 20; /* XXX violates themes... */
    }
    else {
      wcol->shadedown += 20;
    }
 
    if (state & UI_SCROLL_PRESSED) {
      wcol->inner[0] = wcol->inner[0] >= 250 ? 255 : wcol->inner[0] + 5;
      wcol->inner[1] = wcol->inner[1] >= 250 ? 255 : wcol->inner[1] + 5;
      wcol->inner[2] = wcol->inner[2] >= 250 ? 255 : wcol->inner[2] + 5;
    }
 
    /* draw */
    wtb.draw_emboss = false; /* only emboss once */
 
    round_box_edges(&wtb, UI_CNR_ALL, slider, rad);
 
    if (state & UI_SCROLL_ARROWS) {
      const uchar lightness = srgb_to_grayscale_byte(wcol->item);
      if (lightness > 70) {
        wcol->item[0] = 0;
        wcol->item[1] = 0;
        wcol->item[2] = 0;
        wcol->item[3] = 128;
      }
      else {
        wcol->item[0] = 255;
        wcol->item[1] = 255;
        wcol->item[2] = 255;
        wcol->item[3] = 128;
      }
 
      if (horizontal) {
        rcti slider_inset = *slider;
        slider_inset.xmin += 0.05 * U.widget_unit;
        slider_inset.xmax -= 0.05 * U.widget_unit;
        shape_preset_init_scroll_circle(&wtb.tria1, &slider_inset, 0.6f, 'l');
        shape_preset_init_scroll_circle(&wtb.tria2, &slider_inset, 0.6f, 'r');
      }
      else {
        shape_preset_init_scroll_circle(&wtb.tria1, slider, 0.6f, 'b');
        shape_preset_init_scroll_circle(&wtb.tria2, slider, 0.6f, 't');
      }
    }
    widgetbase_draw(&wtb, wcol);
  }
}
 
static void widget_scroll(uiBut *but,
                          uiWidgetColors *wcol,
                          rcti *rect,
                          const uiWidgetStateInfo *state,
                          int /*roundboxalign*/,
                          const float /*zoom*/)
{
  const uiButScrollBar *but_scroll = reinterpret_cast<const uiButScrollBar *>(but);
  const float height = but_scroll->visual_height;
 
  /* calculate slider part */
  const float value = float(ui_but_value_get(but));
 
  const float size = max_ff((but->softmax + height - but->softmin), 2.0f);
 
  /* position */
  rcti rect1 = *rect;
 
  /* determine horizontal/vertical */
  const bool horizontal = (BLI_rcti_size_x(rect) > BLI_rcti_size_y(rect));
 
  if (horizontal) {
    const float fac = BLI_rcti_size_x(rect) / size;
    rect1.xmin = rect1.xmin + ceilf(fac * (value - but->softmin));
    rect1.xmax = rect1.xmin + ceilf(fac * (height - but->softmin));
 
    /* Ensure minimum size. */
    const float min = BLI_rcti_size_y(rect);
 
    if (BLI_rcti_size_x(&rect1) < min) {
      rect1.xmax = rect1.xmin + min;
 
      if (rect1.xmax > rect->xmax) {
        rect1.xmax = rect->xmax;
        rect1.xmin = max_ii(rect1.xmax - min, rect->xmin);
      }
    }
  }
  else {
    const float fac = BLI_rcti_size_y(rect) / size;
    rect1.ymax = rect1.ymax - ceilf(fac * (value - but->softmin));
    rect1.ymin = rect1.ymax - ceilf(fac * (height - but->softmin));
 
    /* Ensure minimum size. */
    const float min = BLI_rcti_size_x(rect);
 
    if (BLI_rcti_size_y(&rect1) < min) {
      rect1.ymax = rect1.ymin + min;
 
      if (rect1.ymax > rect->ymax) {
        rect1.ymax = rect->ymax;
        rect1.ymin = max_ii(rect1.ymax - min, rect->ymin);
      }
    }
  }
 
  UI_draw_widget_scroll(wcol, rect, &rect1, (state->but_flag & UI_SELECT) ? UI_SCROLL_PRESSED : 0);
}
 
static void widget_progress_type_bar(uiButProgress *but_progress,
                                     uiWidgetColors *wcol,
                                     rcti *rect,
                                     int roundboxalign,
                                     const float zoom)
{
  rcti rect_prog = *rect, rect_bar = *rect;
 
  uiWidgetBase wtb, wtb_bar;
  widget_init(&wtb);
  widget_init(&wtb_bar);
 
  /* round corners */
  const float factor = but_progress->progress_factor;
  const float ofs = widget_radius_from_zoom(zoom, wcol);
  float w = factor * BLI_rcti_size_x(&rect_prog);
 
  /* Ensure minimum size. */
  w = std::max(w, ofs);
 
  rect_bar.xmax = rect_bar.xmin + w;
 
  round_box_edges(&wtb, roundboxalign, &rect_prog, ofs);
  round_box_edges(&wtb_bar, roundboxalign, &rect_bar, ofs);
 
  wtb.draw_outline = true;
  widgetbase_draw(&wtb, wcol);
 
  /* "slider" bar color */
  copy_v3_v3_uchar(wcol->inner, wcol->item);
  widgetbase_draw(&wtb_bar, wcol);
}

static void widget_progress_type_ring(uiButProgress *but_progress,
                                      uiWidgetColors *wcol,
                                      rcti *rect)
{
  const float ring_width = 0.6; /* 0.0 would be a pie. */
  const float outer_rad = (rect->ymax - rect->ymin) / 2.0f;
  const float inner_rad = outer_rad * ring_width;
  const float x = rect->xmin + outer_rad;
  const float y = rect->ymin + outer_rad;
  const float start = 0.0f;
  const float end = but_progress->progress_factor * 360.0f;
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(
      format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
  immUniformColor3ubvAlpha(wcol->item, 255 / UI_PIXEL_AA_JITTER * 2);
  GPU_blend(GPU_BLEND_ALPHA);
 
  for (int i = 0; i < UI_PIXEL_AA_JITTER; i++) {
    imm_draw_disk_partial_fill_2d(pos,
                                  x + ui_pixel_jitter[i][0],
                                  y + ui_pixel_jitter[i][1],
                                  inner_rad,
                                  outer_rad,
                                  48,
                                  start,
                                  end);
  }
  immUnbindProgram();
 
  if (but_progress->drawstr[0]) {
    rect->xmin += UI_UNIT_X;
  }
}
 
static void widget_progress_indicator(uiBut *but,
                                      uiWidgetColors *wcol,
                                      rcti *rect,
                                      const uiWidgetStateInfo * /*state*/,
                                      int roundboxalign,
                                      const float zoom)
{
  uiButProgress *but_progress = static_cast<uiButProgress *>(but);
  switch (but_progress->progress_type) {
    case blender::ui::ButProgressType::Bar: {
      widget_progress_type_bar(but_progress, wcol, rect, roundboxalign, zoom);
      break;
    }
    case blender::ui::ButProgressType::Ring: {
      widget_progress_type_ring(but_progress, wcol, rect);
      break;
    }
  }
}
 
static void widget_nodesocket(uiBut *but,
                              uiWidgetColors * /*wcol*/,
                              rcti *rect,
                              const uiWidgetStateInfo * /*state*/,
                              int /*roundboxalign*/,
                              const float zoom)
{
  blender::ColorTheme4f socket_color;
  rgba_uchar_to_float(socket_color, but->col);
 
  blender::ColorTheme4f outline_color;
  UI_GetThemeColorType4fv(TH_WIRE, SPACE_NODE, outline_color);
  outline_color.a = 1.0f;
 
  const int cent_x = BLI_rcti_cent_x(rect);
  const int cent_y = BLI_rcti_cent_y(rect);
  const int socket_radius = 0.25f * BLI_rcti_size_y(rect);
 
  rctf socket_rect;
  socket_rect.xmin = cent_x - socket_radius;
  socket_rect.xmax = cent_x + socket_radius;
  socket_rect.ymin = cent_y - socket_radius;
  socket_rect.ymax = cent_y + socket_radius;
 
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);
 
  blender::ed::space_node::node_draw_nodesocket(&socket_rect,
                                                socket_color,
                                                outline_color,
                                                U.pixelsize,
                                                SOCK_DISPLAY_SHAPE_CIRCLE,
                                                1.0f / zoom);
}
 
static void widget_numslider(uiBut *but,
                             uiWidgetColors *wcol,
                             rcti *rect,
                             const uiWidgetStateInfo *state,
                             int roundboxalign,
                             const float zoom)
{
  uiWidgetBase wtb, wtb1;
  widget_init(&wtb);
  widget_init(&wtb1);
 
  /* Backdrop first. */
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  wtb.draw_outline = false;
  widgetbase_draw(&wtb, wcol);
 
  /* Draw slider part only when not in text editing. */
  if (!state->is_text_input && !(but->drawflag & UI_BUT_INDETERMINATE)) {
    int roundboxalign_slider = roundboxalign;
 
    uchar outline[3];
    copy_v3_v3_uchar(outline, wcol->outline);
    copy_v3_v3_uchar(wcol->outline, wcol->item);
    copy_v3_v3_uchar(wcol->inner, wcol->item);
 
    if (!(state->but_flag & UI_SELECT)) {
      std::swap(wcol->shadetop, wcol->shadedown);
    }
 
    rcti rect1 = *rect;
    float factor, factor_ui;
    float factor_discard = 1.0f; /* No discard. */
    const float value = float(ui_but_value_get(but));
    const float softmin = but->softmin;
    const float softmax = but->softmax;
    const float softrange = softmax - softmin;
    const PropertyScaleType scale_type = ui_but_scale_type(but);
 
    switch (scale_type) {
      case PROP_SCALE_LINEAR: {
        if (but->rnaprop && (RNA_property_subtype(but->rnaprop) == PROP_PERCENTAGE)) {
          factor = value / softmax;
        }
        else {
          factor = (value - softmin) / softrange;
        }
        break;
      }
      case PROP_SCALE_LOG: {
        const float logmin = fmaxf(softmin, 0.5e-8f);
        const float base = softmax / logmin;
        factor = logf(value / logmin) / logf(base);
        break;
      }
      case PROP_SCALE_CUBIC: {
        const float cubicmin = cube_f(softmin);
        const float cubicmax = cube_f(softmax);
        const float cubicrange = cubicmax - cubicmin;
        const float f = (value - softmin) * cubicrange / softrange + cubicmin;
        factor = (cbrtf(f) - softmin) / softrange;
        break;
      }
    }
 
    const float width = float(BLI_rcti_size_x(rect));
    factor_ui = factor * width;
    /* The rectangle width needs to be at least twice the corner radius for the round corners
     * to be drawn properly. */
    const float min_width = 2.0f * rad;
 
    if (factor_ui > width - rad) {
      /* Left part + middle part + right part. */
      factor_discard = factor;
    }
    else if (factor_ui > min_width) {
      /* Left part + middle part. */
      roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
      rect1.xmax = rect1.xmin + factor_ui;
    }
    else {
      /* Left part */
      roundboxalign_slider &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
      rect1.xmax = rect1.xmin + min_width;
      factor_discard = factor_ui / min_width;
    }
 
    round_box_edges(&wtb1, roundboxalign_slider, &rect1, rad);
    wtb1.draw_outline = false;
    widgetbase_set_uniform_discard_factor(&wtb1, factor_discard);
    widgetbase_draw(&wtb1, wcol);
 
    copy_v3_v3_uchar(wcol->outline, outline);
 
    if (!(state->but_flag & UI_SELECT)) {
      std::swap(wcol->shadetop, wcol->shadedown);
    }
  }
 
  /* Outline. */
  wtb.draw_outline = true;
  wtb.draw_inner = false;
  widgetbase_draw(&wtb, wcol);
 
  /* Add space at either side of the button so text aligns with number-buttons
   * (which have arrow icons). */
  if (!state->is_text_input) {
    const float text_padding = NUM_BUT_PADDING_FACTOR * BLI_rcti_size_y(rect);
    rect->xmax -= text_padding;
    rect->xmin += text_padding;
  }
}
 
/* I think 3 is sufficient border to indicate keyed status */
#define SWATCH_KEYED_BORDER 3
 
static void widget_swatch(uiBut *but,
                          uiWidgetColors *wcol,
                          rcti *rect,
                          const uiWidgetStateInfo *state,
                          int roundboxalign,
                          const float zoom)
{
  BLI_assert(but->type == ButType::Color);
  uiButColor *color_but = (uiButColor *)but;
  float col[4];
 
  col[3] = 1.0f;
 
  if (but->rnaprop) {
    BLI_assert(but->rnaindex == -1);
 
    if (RNA_property_array_length(&but->rnapoin, but->rnaprop) >= 4) {
      col[3] = RNA_property_float_get_index(&but->rnapoin, but->rnaprop, 3);
    }
  }
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  ui_but_v3_get(but, col);
 
  if (but->drawflag & UI_BUT_INDETERMINATE) {
    col[0] = col[1] = col[2] = col[3] = 0.5f;
  }
 
  if ((state->but_flag & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN |
                          UI_BUT_OVERRIDDEN | UI_BUT_REDALERT)) ||
      (state->but_drawflag & UI_BUT_ANIMATED_CHANGED))
  {
    /* draw based on state - color for keyed etc */
    widgetbase_draw(&wtb, wcol);
 
    /* inset to draw swatch color */
    rect->xmin += SWATCH_KEYED_BORDER;
    rect->xmax -= SWATCH_KEYED_BORDER;
    rect->ymin += SWATCH_KEYED_BORDER;
    rect->ymax -= SWATCH_KEYED_BORDER;
 
    round_box_edges(&wtb, roundboxalign, rect, rad);
  }
 
  if (!ui_but_is_color_gamma(but)) {
    ui_block_cm_to_display_space_v3(but->block, col);
  }
 
  const bool show_alpha_checkers = col[3] < 1.0f;
 
  /* Now we reduce alpha of the inner color (i.e. the color shown)
   * so that this setting can look grayed out, while retaining
   * the checkerboard (for transparent values). This is needed
   * here as the effects of ui_widget_color_disabled() are overwritten. */
  col[3] *= widget_alpha_factor(state);
 
  widgetbase_draw_color(&wtb, wcol, col, show_alpha_checkers);
  if (color_but->is_pallete_color &&
      ((Palette *)but->rnapoin.owner_id)->active_color == color_but->palette_color_index)
  {
    const float width = rect->xmax - rect->xmin;
    const float height = rect->ymax - rect->ymin;
    /* find color luminance and change it slightly */
    float bw = srgb_to_grayscale(col);
 
    bw += (bw < 0.5f) ? 0.5f : -0.5f;
 
    /* We are drawing on top of widget bases. Flush cache. */
    GPU_blend(GPU_BLEND_ALPHA);
    UI_widgetbase_draw_cache_flush();
    GPU_blend(GPU_BLEND_NONE);
 
    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
    immUniformColor3f(bw, bw, bw);
    immBegin(GPU_PRIM_TRIS, 3);
    immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.9f * height);
    immVertex2f(pos, rect->xmin + 0.1f * width, rect->ymin + 0.5f * height);
    immVertex2f(pos, rect->xmin + 0.5f * width, rect->ymin + 0.9f * height);
    immEnd();
 
    immUnbindProgram();
  }
}
 
static void widget_unitvec(uiBut *but,
                           uiWidgetColors *wcol,
                           rcti *rect,
                           const uiWidgetStateInfo * /*state*/,
                           int /*roundboxalign*/,
                           const float zoom)
{
  const float rad = widget_radius_from_zoom(zoom, wcol);
  ui_draw_but_UNITVEC(but, wcol, rect, rad);
}
 
static void widget_icon_has_anim(uiBut *but,
                                 uiWidgetColors *wcol,
                                 rcti *rect,
                                 const uiWidgetStateInfo *state,
                                 int roundboxalign,
                                 const float zoom)
{
  if (state->but_flag & (UI_BUT_ANIMATED | UI_BUT_ANIMATED_KEY | UI_BUT_DRIVEN |
                         UI_BUT_OVERRIDDEN | UI_BUT_REDALERT) &&
      but->emboss != blender::ui::EmbossType::None)
  {
    uiWidgetBase wtb;
    widget_init(&wtb);
    wtb.draw_outline = false;
 
    const float rad = widget_radius_from_zoom(zoom, wcol);
    round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
    widgetbase_draw(&wtb, wcol);
  }
  else if (but->type == ButType::Num) {
    /* Draw number buttons still with left/right
     * triangles when field is not embossed */
    widget_numbut_embossn(but, wcol, rect, state, roundboxalign, zoom);
  }
  else if (but->type == ButType::Menu) {
    /* Draw menu buttons still with down arrow. */
    widget_menubut_embossn(but, wcol, rect, state, roundboxalign);
  }
}
 
static void widget_textbut(uiWidgetColors *wcol,
                           rcti *rect,
                           const uiWidgetStateInfo *state,
                           int roundboxalign,
                           const float zoom)
{
  if (state->but_flag & UI_SELECT) {
    std::swap(wcol->shadetop, wcol->shadedown);
  }
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_menuiconbut(uiWidgetColors *wcol,
                               rcti *rect,
                               const uiWidgetStateInfo * /*state*/,
                               int roundboxalign,
                               const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  /* decoration */
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_pulldownbut(uiWidgetColors *wcol,
                               rcti *rect,
                               const uiWidgetStateInfo *state,
                               int roundboxalign,
                               const float zoom)
{
  float back[4];
  UI_GetThemeColor4fv(TH_BACK, back);
 
  if ((state->but_flag & UI_HOVER) || (back[3] < 1.0f)) {
    uiWidgetBase wtb;
    const float rad = widget_radius_from_zoom(zoom, wcol);
 
    if (state->but_flag & UI_HOVER) {
      copy_v4_v4_uchar(wcol->inner, wcol->inner_sel);
      copy_v3_v3_uchar(wcol->text, wcol->text_sel);
    }
    else {
      wcol->inner[3] *= 1.0f - back[3];
      wcol->outline[3] = 0.0f;
    }
 
    widget_init(&wtb);
 
    /* half rounded */
    round_box_edges(&wtb, roundboxalign, rect, rad);
 
    widgetbase_draw(&wtb, wcol);
  }
}
 
static void widget_menu_itembut(uiWidgetColors *wcol,
                                rcti *rect,
                                const uiWidgetStateInfo * /*state*/,
                                int /*roundboxalign*/,
                                const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  /* Padding on the sides. */
  const float padding = zoom * 0.125f * U.widget_unit;
  rect->xmin += padding;
  rect->xmax -= padding;
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
 
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_menu_itembut_unpadded(uiWidgetColors *wcol,
                                         rcti *rect,
                                         const uiWidgetStateInfo * /*state*/,
                                         int /*roundboxalign*/,
                                         const float zoom)
{
  /* This function is used for menu items placed close to each other horizontally, e.g. the matcap
   * preview popup or the row of collection color icons in the Outliner context menu. Don't use
   * padding on the sides like the normal menu item. */
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  /* No outline. */
  wtb.draw_outline = false;
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_menu_pie_itembut(uiBut *but,
                                    uiWidgetColors *wcol,
                                    rcti *rect,
                                    const uiWidgetStateInfo * /*state*/,
                                    int /*roundboxalign*/,
                                    const float zoom)
{
  const float fac = but->block->pie_data.alphafac;
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  wtb.draw_emboss = false;
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
 
  wcol->inner[3] *= fac;
  wcol->inner_sel[3] *= fac;
  wcol->item[3] *= fac;
  wcol->text[3] *= fac;
  wcol->text_sel[3] *= fac;
  wcol->outline[3] *= fac;
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_list_itembut(uiBut *but,
                                uiWidgetColors *wcol,
                                rcti *rect,
                                const uiWidgetStateInfo *state,
                                int /*roundboxalign*/,
                                const float zoom)
{
  rcti draw_rect = *rect;
  bool is_selected = state->but_flag & UI_SELECT;
 
  if (but->type == ButType::ViewItem) {
    uiButViewItem *item_but = static_cast<uiButViewItem *>(but);
    blender::ui::AbstractViewItem &view_item = *item_but->view_item;
 
    if (!view_item.is_active() && view_item.is_selected()) {
      copy_v4_v4_uchar(wcol->inner, wcol->inner_sel);
      color_blend_v3_v3(wcol->inner, wcol->outline, 0.5);
      is_selected = true;
    }
    if (item_but->draw_width > 0) {
      BLI_rcti_resize_x(&draw_rect, zoom * item_but->draw_width);
    }
    if (item_but->draw_height > 0) {
      BLI_rcti_resize_y(&draw_rect, zoom * item_but->draw_height);
    }
  }
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, UI_CNR_ALL, &draw_rect, rad);
 
  if (state->but_flag & UI_HOVER) {
    color_blend_v3_v3(wcol->inner, wcol->text, 0.2);
    wcol->inner[3] = is_selected ? 255 : 20;
  }
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_preview_tile(uiBut *but,
                                uiWidgetColors *wcol,
                                rcti *rect,
                                const uiWidgetStateInfo *state,
                                int roundboxalign,
                                const float zoom)
{
  if (!ELEM(but->emboss, blender::ui::EmbossType::None, blender::ui::EmbossType::NoneOrStatus)) {
    widget_list_itembut(but, wcol, rect, state, roundboxalign, zoom);
  }
 
  const BIFIconID icon = ui_but_icon(but);
  ui_draw_preview_item_stateless(&UI_style_get()->widget,
                                 rect,
                                 but->drawstr,
                                 icon,
                                 wcol->text,
                                 UI_STYLE_TEXT_CENTER,
                                 !(but->drawflag & UI_BUT_NO_PREVIEW_PADDING));
}
 
static void widget_optionbut(uiWidgetColors *wcol,
                             rcti *rect,
                             const uiWidgetStateInfo *state,
                             int /*roundboxalign*/,
                             const float /*zoom*/)
{
  /* For a right aligned layout (signified by #UI_BUT_TEXT_RIGHT), draw the text on the left of the
   * checkbox. */
  const bool text_before_widget = (state->but_drawflag & UI_BUT_TEXT_RIGHT);
  rcti recttemp = *rect;
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  /* square */
  if (text_before_widget) {
    recttemp.xmin = recttemp.xmax - BLI_rcti_size_y(&recttemp);
  }
  else {
    recttemp.xmax = recttemp.xmin + BLI_rcti_size_y(&recttemp);
  }
 
  /* smaller */
  const int delta = (BLI_rcti_size_y(&recttemp) - 2 * U.pixelsize) / 6;
  BLI_rcti_resize(
      &recttemp, BLI_rcti_size_x(&recttemp) - delta * 2, BLI_rcti_size_y(&recttemp) - delta * 2);
  /* Keep one edge in place. */
  BLI_rcti_translate(&recttemp, text_before_widget ? delta : -delta, 0);
 
  if (state->but_drawflag & UI_BUT_INDETERMINATE) {
    /* The same muted background color regardless of state. */
    color_blend_v4_v4v4(wcol->inner, wcol->inner, wcol->inner_sel, 0.75f);
  }
 
  const float rad = widget_radius_from_rcti(&recttemp, wcol);
  round_box_edges(&wtb, UI_CNR_ALL, &recttemp, rad);
 
  /* decoration */
  if (state->but_drawflag & UI_BUT_INDETERMINATE) {
    shape_preset_trias_from_rect_dash(&wtb.tria1, &recttemp);
  }
  else if (state->but_flag & UI_SELECT) {
    shape_preset_trias_from_rect_checkmark(&wtb.tria1, &recttemp);
  }
 
  widgetbase_draw(&wtb, wcol);
 
  /* Text space - factor is really just eyeballed. */
  const float offset = delta * 0.9;
  if (text_before_widget) {
    rect->xmax = recttemp.xmin - offset;
  }
  else {
    rect->xmin = recttemp.xmax + offset;
  }
}
 
/* labels use Editor theme colors for text */
static void widget_state_label(uiWidgetType *wt,
                               const uiWidgetStateInfo *state,
                               blender::ui::EmbossType emboss)
{
  if (state->but_flag & UI_BUT_LIST_ITEM) {
    /* Override default label theme's colors. */
    bTheme *btheme = UI_GetTheme();
    wt->wcol_theme = &btheme->tui.wcol_list_item;
    /* call this for option button */
    widget_state(wt, state, emboss);
  }
  else {
    /* call this for option button */
    widget_state(wt, state, emboss);
    if (state->but_flag & UI_SELECT) {
      UI_GetThemeColor3ubv(TH_TEXT_HI, wt->wcol.text);
    }
    else {
      UI_GetThemeColor3ubv(TH_TEXT, wt->wcol.text);
    }
  }
 
  if (state->but_flag & UI_BUT_REDALERT) {
    uchar red[4];
    UI_GetThemeColor3ubv(TH_REDALERT, red);
    color_mul_hsl_v3(red, 1.0f, 1.5f, 1.5f);
    color_blend_v3_v3(wt->wcol.text, red, 0.5f);
  }
}
 
static void widget_radiobut(uiWidgetColors *wcol,
                            rcti *rect,
                            const uiWidgetStateInfo * /*state*/,
                            int roundboxalign,
                            const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_box(uiBut *but,
                       uiWidgetColors *wcol,
                       rcti *rect,
                       const uiWidgetStateInfo * /*state*/,
                       int roundboxalign,
                       const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  uchar old_col[3];
  copy_v3_v3_uchar(old_col, wcol->inner);
 
  /* abuse but->hsv - if it's non-zero, use this color as the box's background */
  if (but != nullptr && but->col[3]) {
    wcol->inner[0] = but->col[0];
    wcol->inner[1] = but->col[1];
    wcol->inner[2] = but->col[2];
    wcol->inner[3] = but->col[3];
  }
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
  wtb.draw_emboss = draw_emboss(but);
  widgetbase_draw(&wtb, wcol);
 
  copy_v3_v3_uchar(wcol->inner, old_col);
 
  /* Flush the cache so that we don't draw over contents. #125035 */
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);
}
 
static void widget_but(uiWidgetColors *wcol,
                       rcti *rect,
                       const uiWidgetStateInfo * /*state*/,
                       int roundboxalign,
                       const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
 
#if 0
static void widget_roundbut(uiWidgetColors *wcol, rcti *rect, int /*state*/ int roundboxalign)
{
  uiWidgetBase wtb;
  const float rad = wcol->roundness * U.widget_unit;
 
  widget_init(&wtb);
 
  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  widgetbase_draw(&wtb, wcol);
}
#endif
 
static void widget_roundbut_exec(uiBut *but,
                                 uiWidgetColors *wcol,
                                 rcti *rect,
                                 const uiWidgetStateInfo *state,
                                 int roundboxalign,
                                 const float zoom)
{
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  if (state->has_hold_action) {
    /* Show that keeping pressed performs another action (typically a menu). */
    shape_preset_init_hold_action(&wtb.tria1, rect, 0.75f, 'r');
  }
 
  const float rad = widget_radius_from_zoom(zoom, wcol);
 
  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);
  wtb.draw_emboss = draw_emboss(but);
  widgetbase_draw(&wtb, wcol);
}
 
static void widget_tab(uiBut *but,
                       uiWidgetColors *wcol,
                       rcti *rect,
                       const uiWidgetStateInfo *state,
                       int roundboxalign,
                       const float zoom)
{
  const float rad = widget_radius_from_zoom(zoom, wcol);
  const bool is_active = (state->but_flag & UI_SELECT);
 
  /* Draw shaded outline - Disabled for now,
   * seems incorrect and also looks nicer without it IMHO ;). */
  // #define USE_TAB_SHADED_HIGHLIGHT
 
  uchar theme_col_tab_highlight[3];
 
#ifdef USE_TAB_SHADED_HIGHLIGHT
  /* create outline highlight colors */
  if (is_active) {
    interp_v3_v3v3_uchar(theme_col_tab_highlight, wcol->inner_sel, wcol->outline, 0.2f);
  }
  else {
    interp_v3_v3v3_uchar(theme_col_tab_highlight, wcol->inner, wcol->outline, 0.12f);
  }
#endif
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  /* half rounded */
  round_box_edges(&wtb, roundboxalign, rect, rad);
 
  /* draw inner */
#ifdef USE_TAB_SHADED_HIGHLIGHT
  wtb.draw_outline = 0;
#endif
  wtb.draw_emboss = draw_emboss(but);
  widgetbase_draw(&wtb, wcol);
 
  /* We are drawing on top of widget bases. Flush cache. */
  GPU_blend(GPU_BLEND_ALPHA);
  UI_widgetbase_draw_cache_flush();
  GPU_blend(GPU_BLEND_NONE);
 
#ifdef USE_TAB_SHADED_HIGHLIGHT
  /* draw outline (3d look) */
  ui_draw_but_TAB_outline(rect, rad, theme_col_tab_highlight, wcol->inner);
#endif
 
#ifndef USE_TAB_SHADED_HIGHLIGHT
  UNUSED_VARS(is_active, theme_col_tab_highlight);
#endif
}
 
static void widget_draw_extra_mask(const bContext *C, uiBut *but, uiWidgetType *wt, rcti *rect)
{
  bTheme *btheme = UI_GetTheme();
  uiWidgetColors *wcol = &btheme->tui.wcol_radio;
  const float rad = wcol->roundness * U.widget_unit;
 
  /* state copy! */
  wt->wcol = *(wt->wcol_theme);
 
  uiWidgetBase wtb;
  widget_init(&wtb);
 
  if (but->block->drawextra) {
    /* NOTE: drawextra can change rect +1 or -1, to match round errors of existing previews. */
    but->block->drawextra(C, rect);
 
    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
    /* make mask to draw over image */
    uchar col[4];
    UI_GetThemeColor3ubv(TH_BACK, col);
    immUniformColor3ubv(col);
 
    round_box__edges(&wtb, UI_CNR_ALL, rect, 0.0f, rad);
    widgetbase_outline(&wtb, pos);
 
    immUnbindProgram();
  }
 
  /* outline */
  round_box_edges(&wtb, UI_CNR_ALL, rect, rad);
  wtb.draw_outline = true;
  wtb.draw_inner = false;
  widgetbase_draw(&wtb, &wt->wcol);
}
 
static uiWidgetType *widget_type(uiWidgetTypeEnum type)
{
  bTheme *btheme = UI_GetTheme();
 
  /* defaults */
  static uiWidgetType wt;
  wt.wcol_theme = &btheme->tui.wcol_regular;
  wt.wcol_state = &btheme->tui.wcol_state;
  wt.state = widget_state;
  wt.draw = widget_but;
  wt.custom = nullptr;
  wt.text = widget_draw_text_icon;
 
  switch (type) {
    case UI_WTYPE_REGULAR:
      break;
 
    case UI_WTYPE_LABEL:
      wt.draw = nullptr;
      wt.state = widget_state_label;
      break;
 
    case UI_WTYPE_TOGGLE:
      wt.wcol_theme = &btheme->tui.wcol_toggle;
      break;
 
    case UI_WTYPE_CHECKBOX:
      wt.wcol_theme = &btheme->tui.wcol_option;
      wt.draw = widget_optionbut;
      break;
 
    case UI_WTYPE_RADIO:
      wt.wcol_theme = &btheme->tui.wcol_radio;
      wt.draw = widget_radiobut;
      break;
 
    case UI_WTYPE_NUMBER:
      wt.wcol_theme = &btheme->tui.wcol_num;
      wt.custom = widget_numbut;
      break;
 
    case UI_WTYPE_SLIDER:
      wt.wcol_theme = &btheme->tui.wcol_numslider;
      wt.custom = widget_numslider;
      wt.state = widget_state_numslider;
      break;
 
    case UI_WTYPE_EXEC:
      wt.wcol_theme = &btheme->tui.wcol_tool;
      wt.custom = widget_roundbut_exec;
      break;
 
    case UI_WTYPE_TOOLBAR_ITEM:
      wt.wcol_theme = &btheme->tui.wcol_toolbar_item;
      wt.custom = widget_roundbut_exec;
      break;
 
    case UI_WTYPE_TAB:
      wt.wcol_theme = &btheme->tui.wcol_tab;
      wt.custom = widget_tab;
      break;
 
    case UI_WTYPE_TOOLTIP:
      wt.wcol_theme = &btheme->tui.wcol_tooltip;
      wt.draw_block = widget_menu_back;
      break;
 
    /* strings */
    case UI_WTYPE_NAME:
      wt.wcol_theme = &btheme->tui.wcol_text;
      wt.draw = widget_textbut;
      break;
 
    case UI_WTYPE_NAME_LINK:
      break;
 
    case UI_WTYPE_POINTER_LINK:
      break;
 
    case UI_WTYPE_FILENAME:
      break;
 
    /* start menus */
    case UI_WTYPE_MENU_RADIO:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menubut;
      break;
 
    case UI_WTYPE_MENU_ICON_RADIO:
    case UI_WTYPE_MENU_NODE_LINK:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menuiconbut;
      break;
 
    case UI_WTYPE_MENU_POINTER_LINK:
      wt.wcol_theme = &btheme->tui.wcol_menu;
      wt.draw = widget_menubut;
      break;
 
    case UI_WTYPE_PULLDOWN:
      wt.wcol_theme = &btheme->tui.wcol_pulldown;
      wt.draw = widget_pulldownbut;
      wt.state = widget_state_pulldown;
      break;
 
    /* in menus */
    case UI_WTYPE_MENU_ITEM:
      wt.wcol_theme = &btheme->tui.wcol_menu_item;
      wt.draw = widget_menu_itembut;
      wt.state = widget_state_menu_item;
      break;
 
    case UI_WTYPE_MENU_ITEM_UNPADDED:
      wt.wcol_theme = &btheme->tui.wcol_menu_item;
      wt.draw = widget_menu_itembut_unpadded;
      wt.state = widget_state_menu_item;
      break;
 
    case UI_WTYPE_MENU_BACK:
      wt.wcol_theme = &btheme->tui.wcol_menu_back;
      wt.draw_block = widget_menu_back;
      break;
 
    /* specials */
    case UI_WTYPE_ICON:
      wt.custom = widget_icon_has_anim;
      break;
 
    case UI_WTYPE_ICON_LABEL:
      /* behave like regular labels (this is simply a label with an icon) */
      wt.state = widget_state_label;
      wt.custom = widget_icon_has_anim;
      break;
 
    case UI_WTYPE_PREVIEW_TILE:
      wt.draw = nullptr;
      /* Drawn via the `custom` callback. */
      wt.text = nullptr;
      /* Drawing indicates state well enough. No need to change colors further. */
      wt.state = widget_state_nothing;
      wt.custom = widget_preview_tile;
      wt.wcol_theme = &btheme->tui.wcol_list_item;
      break;
 
    case UI_WTYPE_SWATCH:
      wt.custom = widget_swatch;
      break;
 
    case UI_WTYPE_BOX:
      wt.custom = widget_box;
      wt.wcol_theme = &btheme->tui.wcol_box;
      break;
 
    case UI_WTYPE_RGB_PICKER:
      break;
 
    case UI_WTYPE_UNITVEC:
      wt.custom = widget_unitvec;
      break;
 
    case UI_WTYPE_SCROLL:
      wt.wcol_theme = &btheme->tui.wcol_scroll;
      wt.state = widget_state_nothing;
      wt.custom = widget_scroll;
      break;
 
    case UI_WTYPE_LISTITEM:
    case UI_WTYPE_VIEW_ITEM:
      wt.wcol_theme = &btheme->tui.wcol_list_item;
      wt.custom = widget_list_itembut;
      break;
 
    case UI_WTYPE_PROGRESS:
      wt.wcol_theme = &btheme->tui.wcol_progress;
      wt.custom = widget_progress_indicator;
      break;
 
    case UI_WTYPE_NODESOCKET:
      wt.custom = widget_nodesocket;
      break;
 
    case UI_WTYPE_MENU_ITEM_PIE:
      wt.wcol_theme = &btheme->tui.wcol_pie_menu;
      wt.custom = widget_menu_pie_itembut;
      wt.state = widget_state_pie_menu_item;
      break;
  }
 
  return &wt;
}
 
static int widget_roundbox_set(uiBut *but, rcti *rect)
{
  int roundbox = UI_CNR_ALL;
 
  /* alignment */
  if ((but->drawflag & UI_BUT_ALIGN) && but->type != ButType::Pulldown) {
 
    /* ui_popup_block_position has this correction too, keep in sync */
    if (but->drawflag & (UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_STITCH_TOP)) {
      rect->ymax += U.pixelsize;
    }
    if (but->drawflag & (UI_BUT_ALIGN_LEFT | UI_BUT_ALIGN_STITCH_LEFT)) {
      rect->xmin -= U.pixelsize;
    }
 
    switch (but->drawflag & UI_BUT_ALIGN) {
      case UI_BUT_ALIGN_TOP:
        roundbox = UI_CNR_BOTTOM_LEFT | UI_CNR_BOTTOM_RIGHT;
        break;
      case UI_BUT_ALIGN_DOWN:
        roundbox = UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT;
        break;
      case UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT;
        break;
      case UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT;
        break;
      case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_TOP_LEFT;
        break;
      case UI_BUT_ALIGN_DOWN | UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_TOP_RIGHT;
        break;
      case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_RIGHT:
        roundbox = UI_CNR_BOTTOM_LEFT;
        break;
      case UI_BUT_ALIGN_TOP | UI_BUT_ALIGN_LEFT:
        roundbox = UI_CNR_BOTTOM_RIGHT;
        break;
      default:
        roundbox = 0;
        break;
    }
  }
 
  /* align with open menu */
  if (but->active && (but->type != ButType::Popover) && !ui_but_menu_draw_as_popover(but)) {
    const int direction = ui_but_menu_direction(but);
 
    /* Pull-down menus that open above or below a button can have more than one direction. */
    if (direction & UI_DIR_UP) {
      roundbox &= ~(UI_CNR_TOP_RIGHT | UI_CNR_TOP_LEFT);
    }
    else if (direction & UI_DIR_DOWN) {
      roundbox &= ~(UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
    }
    else if (direction == UI_DIR_LEFT) {
      roundbox &= ~(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
    }
    else if (direction == UI_DIR_RIGHT) {
      roundbox &= ~(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
    }
  }
 
  return roundbox;
}
 
static uiWidgetType *popover_widget_type(uiBut *but, rcti *rect)
{
  /* We could use a flag for this, but for now just check size,
   * add up/down arrows if there is room. */
  if ((but->str.empty() && but->icon && (BLI_rcti_size_x(rect) < BLI_rcti_size_y(rect) + 2)) ||
      /* disable for brushes also */
      (but->flag & UI_BUT_ICON_PREVIEW))
  {
    /* No arrows. */
    return widget_type(UI_WTYPE_MENU_ICON_RADIO);
  }
 
  /* With menu arrows. */
  return widget_type(UI_WTYPE_MENU_RADIO);
}

 
/* -------------------------------------------------------------------- */
 
void ui_draw_but(const bContext *C, ARegion *region, uiStyle *style, uiBut *but, rcti *rect)
{
  bTheme *btheme = UI_GetTheme();
  const ThemeUI *tui = &btheme->tui;
  const uiFontStyle *fstyle = &style->widget;
  uiWidgetType *wt = nullptr;
 
  /* handle menus separately */
  if (but->emboss == blender::ui::EmbossType::Pulldown) {
    switch (but->type) {
      case ButType::Label:
        widget_draw_text_icon(&style->widget, &tui->wcol_menu_back, but, rect);
        break;
      case ButType::Sepr:
        break;
      case ButType::SeprLine:
        /* Add horizontal padding between the line and menu sides. */
        BLI_rcti_pad(rect, int(-7.0f * UI_SCALE_FAC), 0);
        ui_draw_separator(&tui->wcol_menu_item, but, rect);
        break;
      default: {
        const bool use_unpadded = (but->flag & UI_BUT_ICON_PREVIEW) ||
                                  ((but->flag & UI_HAS_ICON) && !but->drawstr[0]);
        wt = widget_type(use_unpadded ? UI_WTYPE_MENU_ITEM_UNPADDED : UI_WTYPE_MENU_ITEM);
        break;
      }
    }
  }
  else if (ELEM(but->emboss, blender::ui::EmbossType::None, blender::ui::EmbossType::NoneOrStatus))
  {
    /* Use the same widget types for both no emboss types. Later on,
     * #blender::ui::EmbossType::NoneOrStatus will blend state colors if they apply. */
    switch (but->type) {
      case ButType::Label:
      case ButType::Text:
        wt = widget_type(UI_WTYPE_ICON_LABEL);
        if (!(but->flag & UI_HAS_ICON)) {
          but->drawflag |= UI_BUT_NO_TEXT_PADDING;
        }
        break;
      case ButType::PreviewTile:
        wt = widget_type(UI_WTYPE_PREVIEW_TILE);
        break;
      case ButType::Popover:
        if (but->icon == 0) {
          wt = popover_widget_type(but, rect);
        }
        else { /* Currently used for presets. */
          wt = widget_type(UI_WTYPE_ICON);
        }
        break;
      case ButType::NodeSocket:
        wt = widget_type(UI_WTYPE_NODESOCKET);
        break;
      default:
        wt = widget_type(UI_WTYPE_ICON);
        break;
    }
  }
  else if (but->emboss == blender::ui::EmbossType::PieMenu) {
    wt = widget_type(UI_WTYPE_MENU_ITEM_PIE);
  }
  else {
    BLI_assert(but->emboss == blender::ui::EmbossType::Emboss);
 
    switch (but->type) {
      case ButType::Label:
        wt = widget_type(UI_WTYPE_LABEL);
        if (but->drawflag & UI_BUT_BOX_ITEM) {
          wt->wcol_theme = &tui->wcol_box;
          wt->state = widget_state;
        }
        else if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
          wt->wcol_theme = &tui->wcol_menu_back;
          wt->state = widget_state;
        }
        if (!(but->flag & UI_HAS_ICON)) {
          but->drawflag |= UI_BUT_NO_TEXT_PADDING;
        }
        break;
 
      case ButType::Sepr:
      case ButType::SeprSpacer:
        break;
      case ButType::SeprLine:
        ui_draw_separator(&tui->wcol_menu_item, but, rect);
        break;
 
      case ButType::But:
      case ButType::Decorator:
#ifdef USE_UI_TOOLBAR_HACK
        if ((but->icon != ICON_NONE) && UI_but_is_tool(but)) {
          wt = widget_type(UI_WTYPE_TOOLBAR_ITEM);
        }
        else {
          wt = widget_type(UI_WTYPE_EXEC);
        }
#else
        wt = widget_type(UI_WTYPE_EXEC);
#endif
        break;
 
      case ButType::Num:
        wt = widget_type(UI_WTYPE_NUMBER);
        break;
 
      case ButType::NumSlider:
        wt = widget_type(UI_WTYPE_SLIDER);
        break;
 
      case ButType::Row:
        wt = widget_type(UI_WTYPE_RADIO);
        break;
 
      case ButType::ListRow:
        wt = widget_type(UI_WTYPE_LISTITEM);
        break;
 
      case ButType::Text:
        wt = widget_type(UI_WTYPE_NAME);
        break;
 
      case ButType::SearchMenu:
        wt = widget_type(UI_WTYPE_NAME);
        break;
 
      case ButType::Tab:
        wt = widget_type(UI_WTYPE_TAB);
        break;
 
      case ButType::ButToggle:
      case ButType::Toggle:
      case ButType::ToggleN:
        wt = widget_type(UI_WTYPE_TOGGLE);
        break;
 
      case ButType::Checkbox:
      case ButType::CheckboxN:
        if (!(but->flag & UI_HAS_ICON)) {
          wt = widget_type(UI_WTYPE_CHECKBOX);
 
          if ((but->drawflag & (UI_BUT_TEXT_LEFT | UI_BUT_TEXT_RIGHT)) == 0) {
            but->drawflag |= UI_BUT_TEXT_LEFT;
          }
          /* #widget_optionbut() carefully sets the text rectangle for fine tuned paddings. If the
           * text drawing were to add its own padding, DPI and zoom factor would be applied twice
           * in the final padding, so it's difficult to control it. */
          but->drawflag |= UI_BUT_NO_TEXT_PADDING;
        }
        else {
          wt = widget_type(UI_WTYPE_TOGGLE);
        }
 
        /* option buttons have strings outside, on menus use different colors */
        if (but->block->theme_style == UI_BLOCK_THEME_STYLE_POPUP) {
          wt->state = widget_state_option_menu;
        }
        break;
 
      case ButType::Menu:
      case ButType::Block:
      case ButType::Popover:
        if (but->flag & UI_BUT_NODE_LINK) {
          /* new node-link button, not active yet XXX */
          wt = widget_type(UI_WTYPE_MENU_NODE_LINK);
        }
        else {
          /* Popover button. */
          wt = popover_widget_type(but, rect);
        }
        break;
 
      case ButType::Pulldown:
        wt = widget_type(UI_WTYPE_PULLDOWN);
        break;
 
      case ButType::ButMenu:
        wt = widget_type(UI_WTYPE_MENU_ITEM);
        break;
 
      case ButType::Color:
        wt = widget_type(UI_WTYPE_SWATCH);
        break;
 
      case ButType::Roundbox:
      case ButType::ListBox:
        wt = widget_type(UI_WTYPE_BOX);
        break;
 
      case ButType::PreviewTile:
        wt = widget_type(UI_WTYPE_PREVIEW_TILE);
        break;
 
      case ButType::Extra:
        widget_draw_extra_mask(C, but, widget_type(UI_WTYPE_BOX), rect);
        break;
 
      case ButType::HsvCube: {
        const uiButHSVCube *hsv_but = (uiButHSVCube *)but;
 
        if (ELEM(hsv_but->gradient_type, UI_GRAD_V_ALT, UI_GRAD_L_ALT)) {
          /* vertical V slider, uses new widget draw now */
          ui_draw_but_HSV_v(but, rect);
        }
        else { /* other HSV pickers... */
          ui_draw_but_HSVCUBE(but, rect);
        }
        break;
      }
 
      case ButType::HsvCircle:
        ui_draw_but_HSVCIRCLE(but, &tui->wcol_regular, rect);
        break;
 
      case ButType::ColorBand: {
        /* Horizontal padding to make room for handles at edges. */
        const int padding = BLI_rcti_size_y(rect) / 6;
        rect->xmin += padding;
        rect->xmax -= padding;
        ui_draw_but_COLORBAND(but, &tui->wcol_regular, rect);
        break;
      }
 
      case ButType::Unitvec:
        wt = widget_type(UI_WTYPE_UNITVEC);
        break;
 
      case ButType::Image:
        ui_draw_but_IMAGE(region, but, &tui->wcol_regular, rect);
        break;
 
      case ButType::Histogram:
        ui_draw_but_HISTOGRAM(region, but, &tui->wcol_regular, rect);
        break;
 
      case ButType::Waveform:
        ui_draw_but_WAVEFORM(region, but, &tui->wcol_regular, rect);
        break;
 
      case ButType::Vectorscope:
        ui_draw_but_VECTORSCOPE(region, but, &tui->wcol_regular, rect);
        break;
 
      case ButType::Curve:
        ui_draw_but_CURVE(region, but, &tui->wcol_curve, rect);
        break;
 
      case ButType::CurveProfile:
        ui_draw_but_CURVEPROFILE(region, but, &tui->wcol_curve, rect);
        break;
 
      case ButType::Progress:
        wt = widget_type(UI_WTYPE_PROGRESS);
        break;
 
      case ButType::ViewItem:
        wt = widget_type(UI_WTYPE_VIEW_ITEM);
        break;
 
      case ButType::Scroll:
        wt = widget_type(UI_WTYPE_SCROLL);
        break;
 
      case ButType::Grip:
        wt = widget_type(UI_WTYPE_ICON);
        break;
 
      case ButType::TrackPreview:
        ui_draw_but_TRACKPREVIEW(region, but, &tui->wcol_regular, rect);
        break;
 
      case ButType::NodeSocket:
        wt = widget_type(UI_WTYPE_NODESOCKET);
        break;
 
      default:
        wt = widget_type(UI_WTYPE_REGULAR);
        break;
    }
  }
 
  if (wt == nullptr) {
    return;
  }
 
  // rcti disablerect = *rect; /* rect gets clipped smaller for text */
 
  const int roundboxalign = widget_roundbox_set(but, rect);
 
  uiWidgetStateInfo state = {0};
  state.but_flag = but->flag;
  state.but_drawflag = but->drawflag;
  state.emboss = but->emboss;
 
  /* Override selected flag for drawing. */
  if (but->flag & UI_SELECT_DRAW) {
    state.but_flag |= UI_SELECT;
  }
 
  if ((but->editstr) ||
      (UNLIKELY(but->flag & UI_BUT_DRAG_MULTI) && ui_but_drag_multi_edit_get(but)))
  {
    state.is_text_input = true;
  }
 
  if (but->hold_func) {
    state.has_hold_action = true;
  }
 
  bool use_alpha_blend = false;
  if (but->emboss != blender::ui::EmbossType::Pulldown) {
    if (but->flag & (UI_BUT_DISABLED | UI_BUT_INACTIVE | UI_SEARCH_FILTER_NO_MATCH)) {
      use_alpha_blend = true;
      ui_widget_color_disabled(wt, &state);
    }
  }
 
#ifdef USE_UI_POPOVER_ONCE
  if (but->block->flag & UI_BLOCK_POPOVER_ONCE) {
    if ((but->flag & UI_HOVER) && ui_but_is_popover_once_compat(but)) {
      state.but_flag |= UI_BUT_ACTIVE_DEFAULT;
    }
  }
#endif
  if (but->block->flag & UI_BLOCK_NO_DRAW_OVERRIDDEN_STATE) {
    state.but_flag &= ~UI_BUT_OVERRIDDEN;
  }
 
  if (state.but_drawflag & UI_BUT_INDETERMINATE) {
    state.but_flag &= ~UI_SELECT;
  }
 
  const float zoom = 1.0f / but->block->aspect;
  wt->state(wt, &state, but->emboss);
  if (wt->custom) {
    wt->custom(but, &wt->wcol, rect, &state, roundboxalign, zoom);
  }
  else if (wt->draw) {
    wt->draw(&wt->wcol, rect, &state, roundboxalign, zoom);
  }
 
  if (wt->text) {
    if (use_alpha_blend) {
      GPU_blend(GPU_BLEND_ALPHA);
    }
 
    if (but->type == ButType::Label && !(but->flag & UI_HAS_ICON) && but->col[3] != 0) {
      /* Optionally use button color for text color if label without icon.
       * For example, ensuring that the Splash version text is always white. */
      copy_v4_v4_uchar(wt->wcol.text, but->col);
    }
 
    wt->text(fstyle, &wt->wcol, but, rect);
    if (use_alpha_blend) {
      GPU_blend(GPU_BLEND_NONE);
    }
  }
}
 
static void ui_draw_clip_tri(uiBlock *block, const rcti *rect, uiWidgetType *wt)
{
  if (block) {
    float draw_color[4];
    const uchar *color = wt->wcol.text;
 
    draw_color[0] = float(color[0]) / 255.0f;
    draw_color[1] = float(color[1]) / 255.0f;
    draw_color[2] = float(color[2]) / 255.0f;
    draw_color[3] = 1.0f;
 
    if (block->flag & UI_BLOCK_CLIPTOP) {
      /* XXX no scaling for UI here yet */
      UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymax - 6 * UI_SCALE_FAC, 't', draw_color);
    }
    if (block->flag & UI_BLOCK_CLIPBOTTOM) {
      /* XXX no scaling for UI here yet */
      UI_draw_icon_tri(BLI_rcti_cent_x(rect), rect->ymin + 10 * UI_SCALE_FAC, 'v', draw_color);
    }
  }
}
 
static void ui_draw_dialog_alert(uiBlock *block, const rcti *rect)
{
  if (block->alert_level != uiBlockAlertLevel::Error) {
    return;
  }
 
  float color[4];
  switch (block->alert_level) {
    case uiBlockAlertLevel::Error:
      UI_GetThemeColor4fv(TH_ERROR, color);
      break;
    case uiBlockAlertLevel::Warning:
      UI_GetThemeColor4fv(TH_WARNING, color);
      break;
    case uiBlockAlertLevel::Success:
      UI_GetThemeColor4fv(TH_SUCCESS, color);
      break;
    default:
      UI_GetThemeColor4fv(TH_INFO, color);
  }
 
  bTheme *btheme = UI_GetTheme();
  const float bg_radius = btheme->tui.wcol_menu_back.roundness * U.widget_unit;
  const float line_width = 3.0f * UI_SCALE_FAC;
  const float radius = (bg_radius > (line_width * 2.0f)) ? 0.0f : bg_radius;
  const float padding = (bg_radius > (line_width * 2.0f)) ? bg_radius : 0.0f;
  rctf line_rect;
  BLI_rctf_rcti_copy(&line_rect, rect);
  line_rect.ymin = line_rect.ymax - line_width;
  BLI_rctf_pad(&line_rect, -padding, 0.0f);
  UI_draw_roundbox_corner_set(UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT);
  UI_draw_roundbox_4fv(&line_rect, true, radius, color);
}
 
void ui_draw_menu_back(uiStyle * /*style*/, uiBlock *block, const rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);
 
  wt->state(wt, &STATE_INFO_NULL, blender::ui::EmbossType::Undefined);
  if (block) {
    const float zoom = 1.0f / block->aspect;
    wt->draw_block(&wt->wcol,
                   rect,
                   block->flag,
                   block->alert_level == uiBlockAlertLevel::None ? block->direction :
                                                                   char(UI_DIR_DOWN),
                   zoom);
    if (block->alert_level != uiBlockAlertLevel::None) {
      ui_draw_dialog_alert(block, rect);
    }
  }
  else {
    wt->draw_block(&wt->wcol, rect, 0, 0, 1.0f);
  }
 
  ui_draw_clip_tri(block, rect, wt);
}

static void ui_draw_popover_back_impl(const uiWidgetColors *wcol,
                                      const rcti *rect,
                                      int direction,
                                      const float unit_size,
                                      const float mval_origin[2])
{
  /* Alas, this isn't nice. */
  const float unit_half = unit_size / 2;
  const float cent_x = mval_origin ? std::clamp(mval_origin[0],
                                                rect->xmin + unit_size,
                                                rect->xmax - unit_size) :
                                     BLI_rcti_cent_x(rect);
 
  GPU_blend(GPU_BLEND_ALPHA);
 
  /* Extracted from 'widget_menu_back', keep separate to avoid menu changes breaking popovers */
  {
    uiWidgetBase wtb;
    widget_init(&wtb);
 
    const int roundboxalign = UI_CNR_ALL;
    widget_softshadow(rect, roundboxalign, wcol->roundness * U.widget_unit);
 
    round_box_edges(&wtb, roundboxalign, rect, wcol->roundness * U.widget_unit);
    wtb.draw_emboss = false;
    widgetbase_draw(&wtb, wcol);
  }
 
  /* Draw popover arrow (top/bottom) */
  if (ELEM(direction, UI_DIR_UP, UI_DIR_DOWN)) {
    const uint pos = GPU_vertformat_attr_add(
        immVertexFormat(), "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
 
    const bool is_down = (direction == UI_DIR_DOWN);
    const int sign = is_down ? 1 : -1;
    float y = is_down ? rect->ymax : rect->ymin;
 
    GPU_blend(GPU_BLEND_ALPHA);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ubv(wcol->outline);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();
 
    y = y - sign * round(U.pixelsize * 1.41);
 
    GPU_blend(GPU_BLEND_NONE);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ub(0, 0, 0, 0);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();
 
    GPU_blend(GPU_BLEND_ALPHA);
    immBegin(GPU_PRIM_TRIS, 3);
    immUniformColor4ubv(wcol->inner);
    immVertex2f(pos, cent_x - unit_half, y);
    immVertex2f(pos, cent_x + unit_half, y);
    immVertex2f(pos, cent_x, y + sign * unit_half);
    immEnd();
 
    immUnbindProgram();
  }
 
  GPU_blend(GPU_BLEND_NONE);
}
 
void ui_draw_popover_back(ARegion *region, uiStyle * /*style*/, uiBlock *block, const rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_BACK);
 
  float mval_origin[2] = {float(block->bounds_offset[0]), float(block->bounds_offset[1])};
  ui_window_to_block_fl(region, block, &mval_origin[0], &mval_origin[1]);
  ui_draw_popover_back_impl(
      wt->wcol_theme, rect, block->direction, U.widget_unit / block->aspect, mval_origin);
 
  ui_draw_clip_tri(block, rect, wt);
}
 
static void draw_disk_shaded(float start,
                             float angle,
                             float radius_int,
                             float radius_ext,
                             int subd,
                             const uchar col1[4],
                             const uchar col2[4],
                             bool shaded)
{
  const float radius_ext_scale = (0.5f / radius_ext); /* 1 / (2 * radius_ext) */
 
  uint col;
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(
      format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  if (shaded) {
    col = GPU_vertformat_attr_add(format, "color", blender::gpu::VertAttrType::SFLOAT_32_32_32_32);
    immBindBuiltinProgram(GPU_SHADER_3D_SMOOTH_COLOR);
  }
  else {
    immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
    immUniformColor4ubv(col1);
  }
 
  immBegin(GPU_PRIM_TRI_STRIP, subd * 2);
  for (int i = 0; i < subd; i++) {
    const float a = start + ((i) / float(subd - 1)) * angle;
    const float s = sinf(a);
    const float c = cosf(a);
    const float y1 = s * radius_int;
    const float y2 = s * radius_ext;
 
    if (shaded) {
      uchar r_col[4];
      const float fac = (y1 + radius_ext) * radius_ext_scale;
      color_blend_v4_v4v4(r_col, col1, col2, fac);
      float f_col[4];
      rgba_uchar_to_float(f_col, r_col);
      immAttr4fv(col, f_col);
    }
    immVertex2f(pos, c * radius_int, s * radius_int);
 
    if (shaded) {
      uchar r_col[4];
      const float fac = (y2 + radius_ext) * radius_ext_scale;
      color_blend_v4_v4v4(r_col, col1, col2, fac);
      float f_col[4];
      rgba_uchar_to_float(f_col, r_col);
      immAttr4fv(col, f_col);
    }
    immVertex2f(pos, c * radius_ext, s * radius_ext);
  }
  immEnd();
 
  immUnbindProgram();
}
 
void ui_draw_pie_center(uiBlock *block)
{
  bTheme *btheme = UI_GetTheme();
  const float cx = block->pie_data.pie_center_spawned[0];
  const float cy = block->pie_data.pie_center_spawned[1];
 
  const float *pie_dir = block->pie_data.pie_dir;
 
  const float pie_radius_internal = UI_SCALE_FAC * U.pie_menu_threshold;
  const float pie_radius_external = UI_SCALE_FAC * (U.pie_menu_threshold + 7.0f);
 
  const int subd = 40;
 
  const float angle = atan2f(pie_dir[1], pie_dir[0]);
  /* Use a smaller range if there are both axis aligned & diagonal buttons. */
  const bool has_aligned = (block->pie_data.pie_dir_mask & UI_RADIAL_MASK_ALL_AXIS_ALIGNED) != 0;
  const bool has_diagonal = (block->pie_data.pie_dir_mask & UI_RADIAL_MASK_ALL_DIAGONAL) != 0;
  const float range = (has_aligned && has_diagonal) ? M_PI_4 : M_PI_2;
 
  GPU_matrix_push();
  GPU_matrix_translate_2f(cx, cy);
 
  GPU_blend(GPU_BLEND_ALPHA);
  if (btheme->tui.wcol_pie_menu.shaded) {
    uchar col1[4], col2[4];
    shadecolors4(btheme->tui.wcol_pie_menu.inner,
                 btheme->tui.wcol_pie_menu.shadetop,
                 btheme->tui.wcol_pie_menu.shadedown,
                 col1,
                 col2);
    draw_disk_shaded(
        0.0f, float(M_PI * 2.0), pie_radius_internal, pie_radius_external, subd, col1, col2, true);
  }
  else {
    draw_disk_shaded(0.0f,
                     float(M_PI * 2.0),
                     pie_radius_internal,
                     pie_radius_external,
                     subd,
                     btheme->tui.wcol_pie_menu.inner,
                     nullptr,
                     false);
  }
 
  if (!(block->pie_data.flags & UI_PIE_INVALID_DIR)) {
    if (btheme->tui.wcol_pie_menu.shaded) {
      uchar col1[4], col2[4];
      shadecolors4(btheme->tui.wcol_pie_menu.inner_sel,
                   btheme->tui.wcol_pie_menu.shadetop,
                   btheme->tui.wcol_pie_menu.shadedown,
                   col1,
                   col2);
      draw_disk_shaded(angle - range / 2.0f,
                       range,
                       pie_radius_internal,
                       pie_radius_external,
                       subd,
                       col1,
                       col2,
                       true);
    }
    else {
      draw_disk_shaded(angle - range / 2.0f,
                       range,
                       pie_radius_internal,
                       pie_radius_external,
                       subd,
                       btheme->tui.wcol_pie_menu.inner_sel,
                       nullptr,
                       false);
    }
  }
 
  GPUVertFormat *format = immVertexFormat();
  const uint pos = GPU_vertformat_attr_add(
      format, "pos", blender::gpu::VertAttrType::SFLOAT_32_32);
  immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
  immUniformColor4ubv(btheme->tui.wcol_pie_menu.outline);
 
  imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_internal, subd);
  imm_draw_circle_wire_2d(pos, 0.0f, 0.0f, pie_radius_external, subd);
 
  immUnbindProgram();
 
  if (U.pie_menu_confirm > 0 &&
      !(block->pie_data.flags & (UI_PIE_INVALID_DIR | UI_PIE_CLICK_STYLE)))
  {
    const float pie_confirm_radius = UI_SCALE_FAC * (pie_radius_internal + U.pie_menu_confirm);
    const float pie_confirm_external = UI_SCALE_FAC *
                                       (pie_radius_internal + U.pie_menu_confirm + 7.0f);
 
    const uchar col[4] = {UNPACK3(btheme->tui.wcol_pie_menu.text_sel), 64};
    draw_disk_shaded(angle - range / 2.0f,
                     range,
                     pie_confirm_radius,
                     pie_confirm_external,
                     subd,
                     col,
                     nullptr,
                     false);
  }
 
  GPU_blend(GPU_BLEND_NONE);
  GPU_matrix_pop();
}
 
const uiWidgetColors *ui_tooltip_get_theme()
{
  uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
  return wt->wcol_theme;
}

static void ui_draw_widget_back_color(uiWidgetTypeEnum type,
                                      bool use_shadow,
                                      const rcti *rect,
                                      const float color[4])
{
  uiWidgetType *wt = widget_type(type);
 
  if (use_shadow) {
    widget_softshadow(rect, UI_CNR_ALL, 0.25f * U.widget_unit);
  }
 
  wt->state(wt, &STATE_INFO_NULL, blender::ui::EmbossType::Undefined);
  if (color) {
    rgba_float_to_uchar(wt->wcol.inner, color);
  }
 
  if (wt->draw_block) {
    wt->draw_block(&wt->wcol, rect, 0, UI_CNR_ALL, 1.0f);
  }
  else if (wt->draw) {
    rcti rect_copy = *rect;
    wt->draw(&wt->wcol, &rect_copy, &STATE_INFO_NULL, UI_CNR_ALL, 1.0f);
  }
  else {
    BLI_assert_unreachable();
  }
}
void ui_draw_widget_menu_back_color(const rcti *rect, bool use_shadow, const float color[4])
{
  ui_draw_widget_back_color(UI_WTYPE_MENU_BACK, use_shadow, rect, color);
}
 
void ui_draw_widget_menu_back(const rcti *rect, bool use_shadow)
{
  ui_draw_widget_back_color(UI_WTYPE_MENU_BACK, use_shadow, rect, nullptr);
}
 
void ui_draw_tooltip_background(const uiStyle * /*style*/, uiBlock * /*block*/, const rcti *rect)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_TOOLTIP);
  wt->state(wt, &STATE_INFO_NULL, blender::ui::EmbossType::Undefined);
  /* wt->draw_block ends up using same function to draw the tooltip as menu_back */
  wt->draw_block(&wt->wcol, rect, 0, 0, 1.0f);
}
 
void ui_draw_menu_item(const uiFontStyle *fstyle,
                       rcti *rect,
                       rcti *back_rect,
                       const float zoom,
                       const bool use_unpadded,
                       const char *name,
                       int iconid,
                       int but_flag,
                       uiMenuItemSeparatorType separator_type,
                       int *r_xmax)
{
  uiWidgetType *wt = widget_type(use_unpadded ? UI_WTYPE_MENU_ITEM_UNPADDED : UI_WTYPE_MENU_ITEM);
  const rcti _rect = *rect;
  const int row_height = BLI_rcti_size_y(rect);
  int max_hint_width = INT_MAX;
  int padding = 0.25f * row_height;
  char *cpoin = nullptr;
 
  uiWidgetStateInfo state = {0};
  state.but_flag = but_flag;
 
  wt->state(wt, &state, blender::ui::EmbossType::Undefined);
 
  if (back_rect) {
    wt->draw(&wt->wcol, back_rect, &STATE_INFO_NULL, 0, zoom);
  }
 
  UI_fontstyle_set(fstyle);
 
  /* text location offset */
  rect->xmin += padding;
  if (iconid) {
    rect->xmin += row_height; /* Use square area for icon. */
  }
 
  /* cut string in 2 parts? */
  if (separator_type != UI_MENU_ITEM_SEPARATOR_NONE) {
    cpoin = const_cast<char *>(strrchr(name, UI_SEP_CHAR));
    if (cpoin) {
      *cpoin = 0;
 
      /* need to set this first */
      UI_fontstyle_set(fstyle);
 
      if (separator_type == UI_MENU_ITEM_SEPARATOR_SHORTCUT) {
        /* Shrink rect to exclude the shortcut string. */
        rect->xmax -= BLF_width(fstyle->uifont_id, cpoin + 1, INT_MAX) + UI_ICON_SIZE;
      }
      else if (separator_type == UI_MENU_ITEM_SEPARATOR_HINT) {
        /* Determine max-width for the hint string to leave the name string un-clipped (if there's
         * enough space to display it). */
 
        const int available_width = BLI_rcti_size_x(rect) - padding;
        const int name_width = BLF_width(fstyle->uifont_id, name, INT_MAX);
        const int hint_width = BLF_width(fstyle->uifont_id, cpoin + 1, INT_MAX) + padding;
 
        if ((name_width + hint_width) > available_width) {
          /* Clipping width for hint string. */
          max_hint_width = available_width * 0.40f;
          /* Clipping xmax for clipping of item name. */
          rect->xmax = (hint_width < max_hint_width) ?
                           (rect->xmax - hint_width) :
                           (rect->xmin + (available_width - max_hint_width));
        }
      }
      else {
        BLI_assert_msg(0, "Unknown menu item separator type");
      }
    }
  }
 
  {
    char drawstr[UI_MAX_DRAW_STR];
    const float okwidth = float(BLI_rcti_size_x(rect));
    const size_t max_len = sizeof(drawstr);
    const float minwidth = UI_ICON_SIZE;
 
    STRNCPY_UTF8(drawstr, name);
    if (drawstr[0]) {
      UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');
    }
 
    int xofs = 0, yofs = 0;
    ResultBLF info;
    uiFontStyleDraw_Params params{};
    params.align = UI_STYLE_TEXT_LEFT;
    UI_fontstyle_draw_ex(
        fstyle, rect, drawstr, sizeof(drawstr), wt->wcol.text, &params, &xofs, &yofs, &info);
    if (r_xmax != nullptr) {
      *r_xmax = xofs + info.width;
    }
  }
 
  /* restore rect, was messed with */
  *rect = _rect;
 
  if (iconid) {
    const int xs = rect->xmin + 0.2f * UI_UNIT_X * zoom;
    const int ys = rect->ymin + 0.5f * (BLI_rcti_size_y(rect) - UI_ICON_SIZE * zoom);
 
    const float aspect = U.inv_scale_factor / zoom;
 
    GPU_blend(GPU_BLEND_ALPHA);
    UI_icon_draw_ex(
        xs, ys, iconid, aspect, 1.0f, 0.0f, wt->wcol.text, false, UI_NO_ICON_OVERLAY_TEXT);
    GPU_blend(GPU_BLEND_NONE);
  }
 
  /* part text right aligned */
  if (separator_type != UI_MENU_ITEM_SEPARATOR_NONE) {
    if (cpoin) {
      /* State info for the hint drawing. */
      uiWidgetStateInfo hint_state = state;
      /* Set inactive state for grayed out text. */
      hint_state.but_flag |= UI_BUT_INACTIVE;
 
      wt->state(wt, &hint_state, blender::ui::EmbossType::Undefined);
 
      char hint_drawstr[UI_MAX_DRAW_STR];
      {
        const size_t max_len = sizeof(hint_drawstr);
        const float minwidth = UI_ICON_SIZE;
 
        STRNCPY_UTF8(hint_drawstr, cpoin + 1);
        if (hint_drawstr[0] && (max_hint_width < INT_MAX)) {
          UI_text_clip_middle_ex(fstyle, hint_drawstr, max_hint_width, minwidth, max_len, '\0');
        }
      }
 
      rect->xmax = _rect.xmax - padding;
      uiFontStyleDraw_Params params{};
      params.align = UI_STYLE_TEXT_RIGHT;
      UI_fontstyle_draw(fstyle, rect, hint_drawstr, sizeof(hint_drawstr), wt->wcol.text, &params);
      *cpoin = UI_SEP_CHAR;
    }
  }
}
 
void ui_draw_preview_item_stateless(const uiFontStyle *fstyle,
                                    rcti *rect,
                                    const blender::StringRef name,
                                    int iconid,
                                    const uchar text_col[4],
                                    eFontStyle_Align text_align,
                                    const bool add_padding)
{
  rcti trect = *rect;
  const float text_size = UI_UNIT_Y;
  const bool has_text = !name.is_empty();
 
  float alpha = 1.0f;
 
  if (has_text) {
    /* draw icon in rect above the space reserved for the label */
    rect->ymin += text_size;
  }
  GPU_blend(GPU_BLEND_ALPHA);
  widget_draw_preview_icon(iconid, alpha, 1.0f, add_padding, rect, text_col);
  GPU_blend(GPU_BLEND_NONE);
 
  if (!has_text) {
    return;
  }
 
  /* text rect */
  trect.ymax = trect.ymin + text_size;
  if (add_padding) {
    trect.ymin += PREVIEW_PAD;
    trect.xmin += PREVIEW_PAD;
    trect.xmax -= PREVIEW_PAD;
  }
 
  {
    char drawstr[UI_MAX_DRAW_STR];
    const float okwidth = float(BLI_rcti_size_x(&trect));
    const size_t max_len = sizeof(drawstr);
    const float minwidth = UI_ICON_SIZE;
 
    memcpy(drawstr, name.data(), name.size());
    drawstr[name.size()] = '\0';
    UI_text_clip_middle_ex(fstyle, drawstr, okwidth, minwidth, max_len, '\0');
 
    uiFontStyleDraw_Params params{};
    params.align = text_align;
    UI_fontstyle_draw(fstyle, &trect, drawstr, sizeof(drawstr), text_col, &params);
  }
}
 
void ui_draw_preview_item(const uiFontStyle *fstyle,
                          rcti *rect,
                          const float zoom,
                          const char *name,
                          int iconid,
                          int but_flag,
                          eFontStyle_Align text_align)
{
  uiWidgetType *wt = widget_type(UI_WTYPE_MENU_ITEM_UNPADDED);
 
  uiWidgetStateInfo state = {0};
  state.but_flag = but_flag;
 
  /* drawing button background */
  wt->state(wt, &state, blender::ui::EmbossType::Undefined);
  wt->draw(&wt->wcol, rect, &STATE_INFO_NULL, 0, zoom);
 
  ui_draw_preview_item_stateless(fstyle, rect, name, iconid, wt->wcol.text, text_align, true);
}