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Added BT.601/SMPTE240 to the color primaries conversion matrices

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Sam Lantinga 2024-02-06 17:00:26 -08:00
parent fb823fbe95
commit 9e194c1a1d
1 changed files with 44 additions and 0 deletions
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44
src/video/SDL_pixels.c
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@ -893,16 +893,41 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
/* Conversion matrices generated using gamescope color helpers and the primaries definitions at:
* https://www.itu.int/rec/T-REC-H.273-201612-S/en
*/
static const float mat601to709[] = {
0.939542f, 0.050181f, 0.010277f,
0.017772f, 0.965793f, 0.016435f,
-0.001622f, -0.004370f, 1.005991f,
};
static const float mat601to2020[] = {
0.595254f, 0.349314f, 0.055432f,
0.081244f, 0.891503f, 0.027253f,
0.015512f, 0.081912f, 0.902576f,
};
static const float mat709to601[] = {
1.065379f, -0.055401f, -0.009978f,
-0.019633f, 1.036363f, -0.016731f,
0.001632f, 0.004412f, 0.993956f,
};
static const float mat709to2020[] = {
0.627404f, 0.329283f, 0.043313f,
0.069097f, 0.919541f, 0.011362f,
0.016391f, 0.088013f, 0.895595f,
};
static const float mat2020to601[] = {
1.776133f, -0.687820f, -0.088313f,
-0.161376f, 1.187315f, -0.025940f,
-0.015881f, -0.095931f, 1.111812f,
};
static const float mat2020to709[] = {
1.660496f, -0.587656f, -0.072840f,
-0.124547f, 1.132895f, -0.008348f,
-0.018154f, -0.100597f, 1.118751f
};
static const float matXYZto601[] = {
3.506001f, -1.739790f, -0.544058f,
-1.069047f, 1.977779f, 0.035171f,
0.056307f, -0.196976f, 1.049952f,
};
static const float matXYZto709[] = {
3.240969f, -1.537383f, -0.498611f,
-0.969243f, 1.875967f, 0.041555f,
@ -925,8 +950,24 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
};
switch (dst) {
case SDL_COLOR_PRIMARIES_BT601:
case SDL_COLOR_PRIMARIES_SMPTE240:
switch (src) {
case SDL_COLOR_PRIMARIES_BT709:
return mat709to601;
case SDL_COLOR_PRIMARIES_BT2020:
return mat2020to601;
case SDL_COLOR_PRIMARIES_XYZ:
return matXYZto601;
default:
break;
}
break;
case SDL_COLOR_PRIMARIES_BT709:
switch (src) {
case SDL_COLOR_PRIMARIES_BT601:
case SDL_COLOR_PRIMARIES_SMPTE240:
return mat601to709;
case SDL_COLOR_PRIMARIES_BT2020:
return mat2020to709;
case SDL_COLOR_PRIMARIES_XYZ:
@ -941,6 +982,9 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
break;
case SDL_COLOR_PRIMARIES_BT2020:
switch (src) {
case SDL_COLOR_PRIMARIES_BT601:
case SDL_COLOR_PRIMARIES_SMPTE240:
return mat601to2020;
case SDL_COLOR_PRIMARIES_BT709:
return mat709to2020;
case SDL_COLOR_PRIMARIES_XYZ: