node_composite_convert_color_space.cc

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/* SPDX-FileCopyrightText: 2021 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLI_string.h"
 
#include "UI_interface.hh"
#include "UI_resources.hh"
 
#include "IMB_colormanagement.hh"
 
#include "GPU_shader.hh"
 
#include "COM_node_operation.hh"
#include "COM_ocio_color_space_conversion_shader.hh"
#include "COM_utilities.hh"
 
#include "node_composite_util.hh"
 
namespace blender::nodes::node_composite_convert_color_space_cc {
 
NODE_STORAGE_FUNCS(NodeConvertColorSpace)
 
static void CMP_NODE_CONVERT_COLOR_SPACE_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Color>("Image")
      .default_value({1.0f, 1.0f, 1.0f, 1.0f})
      .compositor_domain_priority(0);
  b.add_output<decl::Color>("Image");
}
 
static void node_composit_init_convert_colorspace(bNodeTree * /*ntree*/, bNode *node)
{
  NodeConvertColorSpace *ncs = static_cast<NodeConvertColorSpace *>(
      MEM_callocN(sizeof(NodeConvertColorSpace), "node colorspace"));
  const char *first_colorspace = IMB_colormanagement_role_colorspace_name_get(
      COLOR_ROLE_SCENE_LINEAR);
  if (first_colorspace && first_colorspace[0]) {
    STRNCPY(ncs->from_color_space, first_colorspace);
    STRNCPY(ncs->to_color_space, first_colorspace);
  }
  else {
    ncs->from_color_space[0] = 0;
    ncs->to_color_space[0] = 0;
  }
  node->storage = ncs;
}
 
static void node_composit_buts_convert_colorspace(uiLayout *layout,
                                                  bContext * /*C*/,
                                                  PointerRNA *ptr)
{
#ifndef WITH_OCIO
  uiItemL(layout, RPT_("Disabled, built without OpenColorIO"), ICON_ERROR);
#endif
 
  uiItemR(layout, ptr, "from_color_space", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
  uiItemR(layout, ptr, "to_color_space", UI_ITEM_R_SPLIT_EMPTY_NAME, nullptr, ICON_NONE);
}
 
using namespace blender::realtime_compositor;
 
class ConvertColorSpaceOperation : public NodeOperation {
 public:
  using NodeOperation::NodeOperation;
 
  void execute() override
  {
    Result &input_image = get_input("Image");
    Result &output_image = get_result("Image");
    if (is_identity()) {
      input_image.pass_through(output_image);
      return;
    }
 
    if (input_image.is_single_value()) {
      execute_single();
      return;
    }
 
    const char *source = node_storage(bnode()).from_color_space;
    const char *target = node_storage(bnode()).to_color_space;
 
    OCIOColorSpaceConversionShader &ocio_shader =
        context().cache_manager().ocio_color_space_conversion_shaders.get(
            context(), source, target);
 
    GPUShader *shader = ocio_shader.bind_shader_and_resources();
 
    /* A null shader indicates that the conversion shader is just a stub implementation since OCIO
     * is disabled at compile time, so pass the input through in that case. */
    if (!shader) {
      input_image.pass_through(output_image);
      return;
    }
 
    input_image.bind_as_texture(shader, ocio_shader.input_sampler_name());
 
    const Domain domain = compute_domain();
    output_image.allocate_texture(domain);
    output_image.bind_as_image(shader, ocio_shader.output_image_name());
 
    compute_dispatch_threads_at_least(shader, domain.size);
 
    input_image.unbind_as_texture();
    output_image.unbind_as_image();
    ocio_shader.unbind_shader_and_resources();
  }
 
  void execute_single()
  {
    const char *source = node_storage(bnode()).from_color_space;
    const char *target = node_storage(bnode()).to_color_space;
    ColormanageProcessor *color_processor = IMB_colormanagement_colorspace_processor_new(source,
                                                                                         target);
 
    Result &input_image = get_input("Image");
    float4 color = input_image.get_color_value();
 
    IMB_colormanagement_processor_apply_pixel(color_processor, color, 3);
    IMB_colormanagement_processor_free(color_processor);
 
    Result &output_image = get_result("Image");
    output_image.allocate_single_value();
    output_image.set_color_value(color);
  }
 
  bool is_identity()
  {
    const char *source = node_storage(bnode()).from_color_space;
    const char *target = node_storage(bnode()).to_color_space;
 
    if (STREQ(source, target)) {
      return true;
    }
 
    /* Data color spaces ignore any color transformation that gets applied to them. */
    if (IMB_colormanagement_space_name_is_data(source)) {
      return true;
    }
 
    return false;
  }
};
 
static NodeOperation *get_compositor_operation(Context &context, DNode node)
{
  return new ConvertColorSpaceOperation(context, node);
}
 
}  // namespace blender::nodes::node_composite_convert_color_space_cc
 
void register_node_type_cmp_convert_color_space()
{
  namespace file_ns = blender::nodes::node_composite_convert_color_space_cc;
  static blender::bke::bNodeType ntype;
 
  cmp_node_type_base(
      &ntype, CMP_NODE_CONVERT_COLOR_SPACE, "Convert Colorspace", NODE_CLASS_CONVERTER);
  ntype.declare = file_ns::CMP_NODE_CONVERT_COLOR_SPACE_declare;
  ntype.draw_buttons = file_ns::node_composit_buts_convert_colorspace;
  blender::bke::node_type_size_preset(&ntype, blender::bke::eNodeSizePreset::Middle);
  ntype.initfunc = file_ns::node_composit_init_convert_colorspace;
  blender::bke::node_type_storage(
      &ntype, "NodeConvertColorSpace", node_free_standard_storage, node_copy_standard_storage);
  ntype.get_compositor_operation = file_ns::get_compositor_operation;
 
  blender::bke::node_register_type(&ntype);
}