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Added colorspace conversion from SDL_COLOR_PRIMARIES_SMPTE431 and SDL_COLOR_PRIMARIES_SMPTE432 to SDL_COLOR_PRIMARIES_BT2020

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This commit is contained in:
Sam Lantinga
2024-02-22 11:01:03 -08:00
parent d3930893aa
commit f4dd0dbbde
1 changed files with 18 additions and 21 deletions
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39
src/video/SDL_pixels.c
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@@ -889,6 +889,10 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
{ {
/* Conversion matrices generated using gamescope color helpers and the primaries definitions at: /* Conversion matrices generated using gamescope color helpers and the primaries definitions at:
* https://www.itu.int/rec/T-REC-H.273-201612-S/en * https://www.itu.int/rec/T-REC-H.273-201612-S/en
*
* You can also generate these online using the RGB-XYZ matrix calculator, and then multiplying
* XYZ_to_dst * src_to_XYZ to get the combined conversion matrix:
* https://www.russellcottrell.com/photo/matrixCalculator.htm
*/ */
static const float mat601to709[] = { static const float mat601to709[] = {
0.939542f, 0.050181f, 0.010277f, 0.939542f, 0.050181f, 0.010277f,
@@ -920,31 +924,26 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
-0.124547f, 1.132895f, -0.008348f, -0.124547f, 1.132895f, -0.008348f,
-0.018154f, -0.100597f, 1.118751f -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,
0.055630f, -0.203977f, 1.056971f,
};
static const float matXYZto2020[] = {
1.716651f, -0.355671f, -0.253366f,
-0.666684f, 1.616481f, 0.015769f,
0.017640f, -0.042771f, 0.942103f,
};
static const float matSMPTE431to709[] = { static const float matSMPTE431to709[] = {
1.120713f, -0.234649f, 0.000000f, 1.120713f, -0.234649f, 0.000000f,
-0.038478f, 1.087034f, 0.000000f, -0.038478f, 1.087034f, 0.000000f,
-0.017967f, -0.082030f, 0.954576f, -0.017967f, -0.082030f, 0.954576f,
}; };
static const float matSMPTE431to2020[] = {
0.689691f, 0.207169f, 0.041346f,
0.041852f, 0.982426f, 0.010846f,
-0.001107f, 0.018362f, 0.854914f,
};
static const float matSMPTE432to709[] = { static const float matSMPTE432to709[] = {
1.224940f, -0.224940f, -0.000000f, 1.224940f, -0.224940f, -0.000000f,
-0.042057f, 1.042057f, 0.000000f, -0.042057f, 1.042057f, 0.000000f,
-0.019638f, -0.078636f, 1.098273f, -0.019638f, -0.078636f, 1.098273f,
}; };
static const float matSMPTE432to2020[] = {
0.753833f, 0.198597f, 0.047570f,
0.045744f, 0.941777f, 0.012479f,
-0.001210f, 0.017602f, 0.983609f,
};
switch (dst) { switch (dst) {
case SDL_COLOR_PRIMARIES_BT601: case SDL_COLOR_PRIMARIES_BT601:
@@ -954,8 +953,6 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
return mat709to601; return mat709to601;
case SDL_COLOR_PRIMARIES_BT2020: case SDL_COLOR_PRIMARIES_BT2020:
return mat2020to601; return mat2020to601;
case SDL_COLOR_PRIMARIES_XYZ:
return matXYZto601;
default: default:
break; break;
} }
@@ -967,8 +964,6 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
return mat601to709; return mat601to709;
case SDL_COLOR_PRIMARIES_BT2020: case SDL_COLOR_PRIMARIES_BT2020:
return mat2020to709; return mat2020to709;
case SDL_COLOR_PRIMARIES_XYZ:
return matXYZto709;
case SDL_COLOR_PRIMARIES_SMPTE431: case SDL_COLOR_PRIMARIES_SMPTE431:
return matSMPTE431to709; return matSMPTE431to709;
case SDL_COLOR_PRIMARIES_SMPTE432: case SDL_COLOR_PRIMARIES_SMPTE432:
@@ -984,8 +979,10 @@ const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_C
return mat601to2020; return mat601to2020;
case SDL_COLOR_PRIMARIES_BT709: case SDL_COLOR_PRIMARIES_BT709:
return mat709to2020; return mat709to2020;
case SDL_COLOR_PRIMARIES_XYZ: case SDL_COLOR_PRIMARIES_SMPTE431:
return matXYZto2020; return matSMPTE431to2020;
case SDL_COLOR_PRIMARIES_SMPTE432:
return matSMPTE432to2020;
default: default:
break; break;
} }