scene/colorspace.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
#include "util/param.h"
 
CCL_NAMESPACE_BEGIN
 
extern ustring u_colorspace_auto;
extern ustring u_colorspace_raw;
extern ustring u_colorspace_srgb;
 
class ColorSpaceProcessor;
 
class ColorSpaceManager {
 public:
  /* Convert used specified colorspace to a colorspace that we are able to
   * convert to and from. If the colorspace is u_colorspace_auto, we auto
   * detect a colospace. */
  static ustring detect_known_colorspace(ustring colorspace,
                                         const char *file_colorspace,
                                         const char *file_format,
                                         bool is_float);
 
  /* Test if colorspace is for non-color data. */
  static bool colorspace_is_data(ustring colorspace);
 
  /* Convert pixels in the specified colorspace to scene linear color for
   * rendering. Must be a colorspace returned from detect_known_colorspace. */
  template<typename T>
  static void to_scene_linear(ustring colorspace,
                              T *pixels,
                              const size_t num_pixels,
                              bool is_rgba,
                              bool compress_as_srgb,
                              bool ignore_alpha);
 
  /* Efficiently convert pixels to scene linear colorspace at render time,
   * for OSL where the image texture cache contains original pixels. The
   * handle is valid for the lifetime of the application. */
  static ColorSpaceProcessor *get_processor(ustring colorspace);
  static void to_scene_linear(ColorSpaceProcessor *processor, float *pixel, const int channels);
 
  /* Clear memory when the application exits. Invalidates all processors. */
  static void free_memory();
 
  /* Create a fallback color space configuration.
   *
   * This may be useful to allow regression test to create a configuration which is considered
   * valid without knowing the actual configuration used by the final application. */
  static void init_fallback_config();
 
 private:
  static void is_builtin_colorspace(ustring colorspace, bool &is_scene_linear, bool &is_srgb);
};
 
CCL_NAMESPACE_END