blender/intern/opencolorio/ocio_capi.h

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2012 Blender Foundation.
 * All rights reserved.
 */

#ifndef __OCIO_CAPI_H__
#define __OCIO_CAPI_H__

#ifdef __cplusplus
extern "C" {
#endif

typedef struct OCIO_GPUShader OCIO_GPUShader;

#define OCIO_DECLARE_HANDLE(name) \
  typedef struct name##__ { \
    int unused; \
  } * name

#define OCIO_ROLE_DATA "data"
#define OCIO_ROLE_SCENE_LINEAR "scene_linear"
#define OCIO_ROLE_COLOR_PICKING "color_picking"
#define OCIO_ROLE_TEXTURE_PAINT "texture_paint"
#define OCIO_ROLE_DEFAULT_BYTE "default_byte"
#define OCIO_ROLE_DEFAULT_FLOAT "default_float"
#define OCIO_ROLE_DEFAULT_SEQUENCER "default_sequencer"

OCIO_DECLARE_HANDLE(OCIO_ConstConfigRcPtr);
OCIO_DECLARE_HANDLE(OCIO_ConstColorSpaceRcPtr);
OCIO_DECLARE_HANDLE(OCIO_ConstProcessorRcPtr);
OCIO_DECLARE_HANDLE(OCIO_ConstCPUProcessorRcPtr);
OCIO_DECLARE_HANDLE(OCIO_ConstContextRcPtr);
OCIO_DECLARE_HANDLE(OCIO_PackedImageDesc);
OCIO_DECLARE_HANDLE(OCIO_ConstLookRcPtr);

/* Standard XYZ to linear sRGB transform, for fallback. */
static const float OCIO_XYZ_TO_LINEAR_SRGB[3][3] = {{3.2404542f, -0.9692660f, 0.0556434f},
                                                    {-1.5371385f, 1.8760108f, -0.2040259f},
                                                    {-0.4985314f, 0.0415560f, 1.0572252f}};

/* This structure is used to pass curve mapping settings from
 * blender's DNA structure stored in view transform settings
 * to a generic OpenColorIO C-API.
 */
typedef struct OCIO_CurveMappingSettings {
  /* This is a LUT which contain values for all 4 curve mapping tables
   * (combined, R, G and B).
   *
   * Element I for table T is stored at I * 4 + T element of this LUT.
   *
   * This array is usually returned by curvemapping_table_RGBA().
   */
  float *lut;

  /* Size of single curve mapping table, 1/4 size of lut array. */
  int lut_size;

  /* Extend extrapolation flags for all the tables.
   * if use_extend_extrapolate != 0 means extrapolation for
   * curve.
   */
  int use_extend_extrapolate;

  /* Minimal X value of the curve mapping tables. */
  float mintable[4];

  /* Per curve mapping table range. */
  float range[4];

  /* Lower extension value, stored as per-component arrays. */
  float ext_in_x[4], ext_in_y[4];

  /* Higher extension value, stored as per-component arrays. */
  float ext_out_x[4], ext_out_y[4];

  /* First points of the tables, both X and Y values.
   * Needed for easier and faster access when extrapolating.
   */
  float first_x[4], first_y[4];

  /* Last points of the tables, both X and Y values.
   * Needed for easier and faster access when extrapolating.
   */
  float last_x[4], last_y[4];

  /* Premultiplication settings: black level and scale to match
   * with white level.
   */
  float black[3], bwmul[3];

  /* Cache id of the original curve mapping, used to detect when
   * upload of new settings to GPU is needed.
   */
  size_t cache_id;
} OCIO_CurveMappingSettings;

void OCIO_init(void);
void OCIO_exit(void);

OCIO_ConstConfigRcPtr *OCIO_getCurrentConfig(void);
void OCIO_setCurrentConfig(const OCIO_ConstConfigRcPtr *config);

OCIO_ConstConfigRcPtr *OCIO_configCreateFromEnv(void);
OCIO_ConstConfigRcPtr *OCIO_configCreateFromFile(const char *filename);
OCIO_ConstConfigRcPtr *OCIO_configCreateFallback(void);

void OCIO_configRelease(OCIO_ConstConfigRcPtr *config);

int OCIO_configGetNumColorSpaces(OCIO_ConstConfigRcPtr *config);
const char *OCIO_configGetColorSpaceNameByIndex(OCIO_ConstConfigRcPtr *config, int index);
OCIO_ConstColorSpaceRcPtr *OCIO_configGetColorSpace(OCIO_ConstConfigRcPtr *config,
                                                    const char *name);
int OCIO_configGetIndexForColorSpace(OCIO_ConstConfigRcPtr *config, const char *name);

int OCIO_colorSpaceIsInvertible(OCIO_ConstColorSpaceRcPtr *cs);
int OCIO_colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs);
void OCIO_colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
                              OCIO_ConstColorSpaceRcPtr *cs,
                              bool *is_scene_linear,
                              bool *is_srgb);

void OCIO_colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs);

const char *OCIO_configGetDefaultDisplay(OCIO_ConstConfigRcPtr *config);
int OCIO_configGetNumDisplays(OCIO_ConstConfigRcPtr *config);
const char *OCIO_configGetDisplay(OCIO_ConstConfigRcPtr *config, int index);
const char *OCIO_configGetDefaultView(OCIO_ConstConfigRcPtr *config, const char *display);
int OCIO_configGetNumViews(OCIO_ConstConfigRcPtr *config, const char *display);
const char *OCIO_configGetView(OCIO_ConstConfigRcPtr *config, const char *display, int index);
const char *OCIO_configGetDisplayColorSpaceName(OCIO_ConstConfigRcPtr *config,
                                                const char *display,
                                                const char *view);

void OCIO_configGetDefaultLumaCoefs(OCIO_ConstConfigRcPtr *config, float *rgb);
void OCIO_configGetXYZtoRGB(OCIO_ConstConfigRcPtr *config, float xyz_to_rgb[3][3]);

int OCIO_configGetNumLooks(OCIO_ConstConfigRcPtr *config);
const char *OCIO_configGetLookNameByIndex(OCIO_ConstConfigRcPtr *config, int index);
OCIO_ConstLookRcPtr *OCIO_configGetLook(OCIO_ConstConfigRcPtr *config, const char *name);

const char *OCIO_lookGetProcessSpace(OCIO_ConstLookRcPtr *look);
void OCIO_lookRelease(OCIO_ConstLookRcPtr *look);

OCIO_ConstProcessorRcPtr *OCIO_configGetProcessorWithNames(OCIO_ConstConfigRcPtr *config,
                                                           const char *srcName,
                                                           const char *dstName);
void OCIO_processorRelease(OCIO_ConstProcessorRcPtr *cpu_processor);

OCIO_ConstCPUProcessorRcPtr *OCIO_processorGetCPUProcessor(OCIO_ConstProcessorRcPtr *processor);
void OCIO_cpuProcessorApply(OCIO_ConstCPUProcessorRcPtr *cpu_processor, OCIO_PackedImageDesc *img);
void OCIO_cpuProcessorApply_predivide(OCIO_ConstCPUProcessorRcPtr *cpu_processor,
                                      OCIO_PackedImageDesc *img);
void OCIO_cpuProcessorApplyRGB(OCIO_ConstCPUProcessorRcPtr *cpu_processor, float *pixel);
void OCIO_cpuProcessorApplyRGBA(OCIO_ConstCPUProcessorRcPtr *cpu_processor, float *pixel);
void OCIO_cpuProcessorApplyRGBA_predivide(OCIO_ConstCPUProcessorRcPtr *cpu_processor,
                                          float *pixel);
void OCIO_cpuProcessorRelease(OCIO_ConstCPUProcessorRcPtr *processor);

const char *OCIO_colorSpaceGetName(OCIO_ConstColorSpaceRcPtr *cs);
const char *OCIO_colorSpaceGetDescription(OCIO_ConstColorSpaceRcPtr *cs);
const char *OCIO_colorSpaceGetFamily(OCIO_ConstColorSpaceRcPtr *cs);

OCIO_ConstProcessorRcPtr *OCIO_createDisplayProcessor(OCIO_ConstConfigRcPtr *config,
                                                      const char *input,
                                                      const char *view,
                                                      const char *display,
                                                      const char *look,
                                                      const float scale,
                                                      const float exponent);

OCIO_PackedImageDesc *OCIO_createOCIO_PackedImageDesc(float *data,
                                                      long width,
                                                      long height,
                                                      long numChannels,
                                                      long chanStrideBytes,
                                                      long xStrideBytes,
                                                      long yStrideBytes);

void OCIO_PackedImageDescRelease(OCIO_PackedImageDesc *p);

bool OCIO_supportGPUShader(void);
bool OCIO_gpuDisplayShaderBind(OCIO_ConstConfigRcPtr *config,
                               const char *input,
                               const char *view,
                               const char *display,
                               const char *look,
                               OCIO_CurveMappingSettings *curve_mapping_settings,
                               const float scale,
                               const float exponent,
                               const float dither,
                               const bool use_predivide,
                               const bool use_overlay);
void OCIO_gpuDisplayShaderUnbind(void);
void OCIO_gpuCacheFree(void);

const char *OCIO_getVersionString(void);
int OCIO_getVersionHex(void);

#ifdef __cplusplus
}
#endif

#endif /* OCIO_CAPI_H */