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Issue #2118 - Part 1: Update gfxUtils YuvColorMatrix functions to match upstream mozilla code more closely.

Browse source 
https://hg.mozilla.org/mozilla-central/file/4fba5295dc19f9d2f5d065ba502a44d8f2dc9e85/gfx/thebes/gfxUtils.cpp#l1246
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u3shit 2023-02-24 19:11:36 +01:00 • committed by roytam1
commit beef437602
6 changed files with 48 additions and 54 deletions
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82
gfx/thebes/gfxUtils.cpp
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@ -1082,61 +1082,55 @@ gfxUtils::EncodeSourceSurface(SourceSurface* aSurface,
aBinaryOrData, aFile, nullptr);
}
/* From Rec601:
[R] [1.1643835616438356, 0.0, 1.5960267857142858] [ Y - 16]
[G] = [1.1643835616438358, -0.3917622900949137, -0.8129676472377708] x [Cb - 128]
[B] [1.1643835616438356, 2.017232142857143, 8.862867620416422e-17] [Cr - 128]
// https://jdashg.github.io/misc/colors/from-coeffs.html
const float kBT601NarrowYCbCrToRGB_RowMajor[16] = {
1.16438f, 0.00000f, 1.59603f, -0.87420f, 1.16438f, -0.39176f,
-0.81297f, 0.53167f, 1.16438f, 2.01723f, 0.00000f, -1.08563f,
0.00000f, 0.00000f, 0.00000f, 1.00000f};
const float kBT709NarrowYCbCrToRGB_RowMajor[16] = {
1.16438f, 0.00000f, 1.79274f, -0.97295f, 1.16438f, -0.21325f,
-0.53291f, 0.30148f, 1.16438f, 2.11240f, 0.00000f, -1.13340f,
0.00000f, 0.00000f, 0.00000f, 1.00000f};
For [0,1] instead of [0,255], and to 5 places:
[R] [1.16438, 0.00000, 1.59603] [ Y - 0.06275]
[G] = [1.16438, -0.39176, -0.81297] x [Cb - 0.50196]
[B] [1.16438, 2.01723, 0.00000] [Cr - 0.50196]
From Rec709:
[R] [1.1643835616438356, 4.2781193979771426e-17, 1.7927410714285714] [ Y - 16]
[G] = [1.1643835616438358, -0.21324861427372963, -0.532909328559444] x [Cb - 128]
[B] [1.1643835616438356, 2.1124017857142854, 0.0] [Cr - 128]
For [0,1] instead of [0,255], and to 5 places:
[R] [1.16438, 0.00000, 1.79274] [ Y - 0.06275]
[G] = [1.16438, -0.21325, -0.53291] x [Cb - 0.50196]
[B] [1.16438, 2.11240, 0.00000] [Cr - 0.50196]
*/
/* static */ float*
/* static */ const float*
gfxUtils::Get4x3YuvColorMatrix(YUVColorSpace aYUVColorSpace)
{
static const float yuv_to_rgb_rec601[12] = { 1.16438f, 0.0f, 1.59603f, 0.0f,
1.16438f, -0.39176f, -0.81297f, 0.0f,
1.16438f, 2.01723f, 0.0f, 0.0f,
};
#define X(x) \
{ x[0], x[1], x[2], 0.0f, x[4], x[5], x[6], 0.0f, x[8], x[9], x[10], 0.0f }
static const float yuv_to_rgb_rec709[12] = { 1.16438f, 0.0f, 1.79274f, 0.0f,
1.16438f, -0.21325f, -0.53291f, 0.0f,
1.16438f, 2.11240f, 0.0f, 0.0f,
};
static const float rec601[12] = X(kBT601NarrowYCbCrToRGB_RowMajor);
static const float rec709[12] = X(kBT709NarrowYCbCrToRGB_RowMajor);
if (aYUVColorSpace == YUVColorSpace::BT709) {
return const_cast<float*>(yuv_to_rgb_rec709);
} else {
return const_cast<float*>(yuv_to_rgb_rec601);
#undef X
switch (aYUVColorSpace) {
case YUVColorSpace::BT601:
return rec601;
case YUVColorSpace::BT709:
return rec709;
default:
MOZ_CRASH("Bad YUVColorSpace");
}
}
/* static */ float*
/* static */ const float*
gfxUtils::Get3x3YuvColorMatrix(YUVColorSpace aYUVColorSpace)
{
static const float yuv_to_rgb_rec601[9] = {
1.16438f, 1.16438f, 1.16438f, 0.0f, -0.39176f, 2.01723f, 1.59603f, -0.81297f, 0.0f,
};
static const float yuv_to_rgb_rec709[9] = {
1.16438f, 1.16438f, 1.16438f, 0.0f, -0.21325f, 2.11240f, 1.79274f, -0.53291f, 0.0f,
};
#define X(x) \
{ x[0], x[4], x[8], x[1], x[5], x[9], x[2], x[6], x[10] }
if (aYUVColorSpace == YUVColorSpace::BT709) {
return const_cast<float*>(yuv_to_rgb_rec709);
} else {
return const_cast<float*>(yuv_to_rgb_rec601);
static const float rec601[9] = X(kBT601NarrowYCbCrToRGB_RowMajor);
static const float rec709[9] = X(kBT709NarrowYCbCrToRGB_RowMajor);
#undef X
switch (aYUVColorSpace) {
case YUVColorSpace::BT601:
return rec601;
case YUVColorSpace::BT709:
return rec709;
default:
MOZ_CRASH("Bad YUVColorSpace");
}
}