cineon_dpx.cc

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/* SPDX-FileCopyrightText: 2006 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "logImageCore.h"
#include <cmath>
#include <cstdio>
#include <cstring>
 
#include "IMB_colormanagement.hh"
#include "IMB_filetype.hh"
#include "IMB_imbuf.hh"
#include "IMB_imbuf_types.hh"
 
#include "BKE_global.hh"
 
#include "MEM_guardedalloc.h"
 
static ImBuf *imb_load_dpx_cineon(
    const uchar *mem, size_t size, int use_cineon, int flags, char colorspace[IM_MAX_SPACE])
{
  ImBuf *ibuf;
  LogImageFile *image;
  int width, height, depth;
 
  colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_FLOAT);
 
  logImageSetVerbose((G.debug & G_DEBUG) ? 1 : 0);
 
  image = logImageOpenFromMemory(mem, size);
 
  if (image == nullptr) {
    printf("DPX/Cineon: error opening image.\n");
    return nullptr;
  }
 
  logImageGetSize(image, &width, &height, &depth);
 
  ibuf = IMB_allocImBuf(width, height, 32, IB_rectfloat | flags);
  if (ibuf == nullptr) {
    logImageClose(image);
    return nullptr;
  }
 
  if (!(flags & IB_test)) {
    if (logImageGetDataRGBA(image, ibuf->float_buffer.data, 1) != 0) {
      logImageClose(image);
      IMB_freeImBuf(ibuf);
      return nullptr;
    }
    IMB_flipy(ibuf);
  }
 
  logImageClose(image);
  ibuf->ftype = use_cineon ? IMB_FTYPE_CINEON : IMB_FTYPE_DPX;
 
  if (flags & IB_alphamode_detect) {
    ibuf->flags |= IB_alphamode_premul;
  }
 
  return ibuf;
}
 
static int imb_save_dpx_cineon(ImBuf *ibuf, const char *filepath, int use_cineon, int flags)
{
  LogImageFile *logImage;
  float *fbuf;
  float *fbuf_ptr;
  const uchar *rect_ptr;
  int x, y, depth, bitspersample, rvalue;
 
  if (flags & IB_mem) {
    printf("DPX/Cineon: saving in memory is not supported.\n");
    return 0;
  }
 
  logImageSetVerbose((G.debug & G_DEBUG) ? 1 : 0);
 
  depth = (ibuf->planes + 7) >> 3;
  if (depth > 4 || depth < 3) {
    printf("DPX/Cineon: unsupported depth: %d for file: '%s'\n", depth, filepath);
    return 0;
  }
 
  if (ibuf->foptions.flag & CINEON_10BIT) {
    bitspersample = 10;
  }
  else if (ibuf->foptions.flag & CINEON_12BIT) {
    bitspersample = 12;
  }
  else if (ibuf->foptions.flag & CINEON_16BIT) {
    bitspersample = 16;
  }
  else {
    bitspersample = 8;
  }
 
  logImage = logImageCreate(filepath,
                            use_cineon,
                            ibuf->x,
                            ibuf->y,
                            bitspersample,
                            (depth == 4),
                            (ibuf->foptions.flag & CINEON_LOG),
                            -1,
                            -1,
                            -1,
                            "Blender");
 
  if (logImage == nullptr) {
    printf("DPX/Cineon: error creating file.\n");
    return 0;
  }
 
  if (ibuf->float_buffer.data != nullptr && bitspersample != 8) {
    /* Don't use the float buffer to save 8 BPP picture to prevent color banding
     * (there's no dithering algorithm behind the #logImageSetDataRGBA function). */
 
    fbuf = (float *)MEM_mallocN(sizeof(float[4]) * ibuf->x * ibuf->y,
                                "fbuf in imb_save_dpx_cineon");
 
    for (y = 0; y < ibuf->y; y++) {
      float *dst_ptr = fbuf + 4 * ((ibuf->y - y - 1) * ibuf->x);
      const float *src_ptr = ibuf->float_buffer.data + 4 * (y * ibuf->x);
 
      memcpy(dst_ptr, src_ptr, 4 * ibuf->x * sizeof(float));
    }
 
    rvalue = (logImageSetDataRGBA(logImage, fbuf, 1) == 0);
 
    MEM_freeN(fbuf);
  }
  else {
    if (ibuf->byte_buffer.data == nullptr) {
      IMB_rect_from_float(ibuf);
    }
 
    fbuf = (float *)MEM_mallocN(sizeof(float[4]) * ibuf->x * ibuf->y,
                                "fbuf in imb_save_dpx_cineon");
    if (fbuf == nullptr) {
      printf("DPX/Cineon: error allocating memory.\n");
      logImageClose(logImage);
      return 0;
    }
    for (y = 0; y < ibuf->y; y++) {
      for (x = 0; x < ibuf->x; x++) {
        fbuf_ptr = fbuf + 4 * ((ibuf->y - y - 1) * ibuf->x + x);
        rect_ptr = ibuf->byte_buffer.data + 4 * (y * ibuf->x + x);
        fbuf_ptr[0] = float(rect_ptr[0]) / 255.0f;
        fbuf_ptr[1] = float(rect_ptr[1]) / 255.0f;
        fbuf_ptr[2] = float(rect_ptr[2]) / 255.0f;
        fbuf_ptr[3] = (depth == 4) ? (float(rect_ptr[3]) / 255.0f) : 1.0f;
      }
    }
    rvalue = (logImageSetDataRGBA(logImage, fbuf, 0) == 0);
    MEM_freeN(fbuf);
  }
 
  logImageClose(logImage);
  return rvalue;
}
 
bool imb_save_cineon(ImBuf *buf, const char *filepath, int flags)
{
  return imb_save_dpx_cineon(buf, filepath, 1, flags);
}
 
bool imb_is_a_cineon(const uchar *buf, size_t size)
{
  return logImageIsCineon(buf, size);
}
 
ImBuf *imb_load_cineon(const uchar *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
{
  if (!imb_is_a_cineon(mem, size)) {
    return nullptr;
  }
  return imb_load_dpx_cineon(mem, size, 1, flags, colorspace);
}