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skia / skia / 43ba2a70f6a648aa9d92f318f4e40fb4ec06b66a / . / src / core / SkYUVMath.cpp
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/*
* Copyright 2019 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkM44.h"
#include "src/core/SkYUVMath.h"
// in SkColorMatrix order (row-major)
// Created by running SkColorMatrix_DumpYUVMatrixTables()
const float JPEG_full_rgb_to_yuv[] = {
0.299000f, 0.587000f, 0.114000f, 0.000000f, 0.000000f,
-0.168736f, -0.331264f, 0.500000f, 0.000000f, 0.501961f,
0.500000f, -0.418688f, -0.081312f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float JPEG_full_yuv_to_rgb[] = {
1.000000f, -0.000000f, 1.402000f, 0.000000f, -0.703749f,
1.000000f, -0.344136f, -0.714136f, 0.000000f, 0.531211f,
1.000000f, 1.772000f, 0.000000f, 0.000000f, -0.889475f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec601_limited_rgb_to_yuv[] = {
0.256788f, 0.504129f, 0.097906f, 0.000000f, 0.062745f,
-0.148223f, -0.290993f, 0.439216f, 0.000000f, 0.501961f,
0.439216f, -0.367788f, -0.071427f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec601_limited_yuv_to_rgb[] = {
1.164384f, -0.000000f, 1.596027f, 0.000000f, -0.874202f,
1.164384f, -0.391762f, -0.812968f, 0.000000f, 0.531668f,
1.164384f, 2.017232f, 0.000000f, 0.000000f, -1.085631f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec709_full_rgb_to_yuv[] = {
0.212600f, 0.715200f, 0.072200f, 0.000000f, 0.000000f,
-0.114572f, -0.385428f, 0.500000f, 0.000000f, 0.501961f,
0.500000f, -0.454153f, -0.045847f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec709_full_yuv_to_rgb[] = {
1.000000f, -0.000000f, 1.574800f, 0.000000f, -0.790488f,
1.000000f, -0.187324f, -0.468124f, 0.000000f, 0.329010f,
1.000000f, 1.855600f, -0.000000f, 0.000000f, -0.931439f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec709_limited_rgb_to_yuv[] = {
0.182586f, 0.614231f, 0.062007f, 0.000000f, 0.062745f,
-0.100644f, -0.338572f, 0.439216f, 0.000000f, 0.501961f,
0.439216f, -0.398942f, -0.040274f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float Rec709_limited_yuv_to_rgb[] = {
1.164384f, -0.000000f, 1.792741f, 0.000000f, -0.972945f,
1.164384f, -0.213249f, -0.532909f, 0.000000f, 0.301483f,
1.164384f, 2.112402f, -0.000000f, 0.000000f, -1.133402f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_8bit_full_rgb_to_yuv[] = {
0.262700f, 0.678000f, 0.059300f, 0.000000f, 0.000000f,
-0.139630f, -0.360370f, 0.500000f, 0.000000f, 0.501961f,
0.500000f, -0.459786f, -0.040214f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_8bit_full_yuv_to_rgb[] = {
1.000000f, -0.000000f, 1.474600f, 0.000000f, -0.740191f,
1.000000f, -0.164553f, -0.571353f, 0.000000f, 0.369396f,
1.000000f, 1.881400f, -0.000000f, 0.000000f, -0.944389f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_8bit_limited_rgb_to_yuv[] = {
0.225613f, 0.582282f, 0.050928f, 0.000000f, 0.062745f,
-0.122655f, -0.316560f, 0.439216f, 0.000000f, 0.501961f,
0.439216f, -0.403890f, -0.035326f, 0.000000f, 0.501961f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_8bit_limited_yuv_to_rgb[] = {
1.164384f, -0.000000f, 1.678674f, 0.000000f, -0.915688f,
1.164384f, -0.187326f, -0.650424f, 0.000000f, 0.347458f,
1.164384f, 2.141772f, -0.000000f, 0.000000f, -1.148145f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_10bit_full_rgb_to_yuv[] = {
0.262700f, 0.678000f, 0.059300f, 0.000000f, 0.000000f,
-0.139630f, -0.360370f, 0.500000f, 0.000000f, 0.500489f,
0.500000f, -0.459786f, -0.040214f, 0.000000f, 0.500489f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_10bit_full_yuv_to_rgb[] = {
1.000000f, -0.000000f, 1.474600f, 0.000000f, -0.738021f,
1.000000f, -0.164553f, -0.571353f, 0.000000f, 0.368313f,
1.000000f, 1.881400f, -0.000000f, 0.000000f, -0.941620f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_10bit_limited_rgb_to_yuv[] = {
0.224951f, 0.580575f, 0.050779f, 0.000000f, 0.062561f,
-0.122296f, -0.315632f, 0.437928f, 0.000000f, 0.500489f,
0.437928f, -0.402706f, -0.035222f, 0.000000f, 0.500489f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_10bit_limited_yuv_to_rgb[] = {
1.167808f, -0.000000f, 1.683611f, 0.000000f, -0.915688f,
1.167808f, -0.187877f, -0.652337f, 0.000000f, 0.347458f,
1.167808f, 2.148072f, -0.000000f, 0.000000f, -1.148145f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_12bit_full_rgb_to_yuv[] = {
0.262700f, 0.678000f, 0.059300f, 0.000000f, 0.000000f,
-0.139630f, -0.360370f, 0.500000f, 0.000000f, 0.500122f,
0.500000f, -0.459786f, -0.040214f, 0.000000f, 0.500122f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_12bit_full_yuv_to_rgb[] = {
1.000000f, -0.000000f, 1.474600f, 0.000000f, -0.737480f,
1.000000f, -0.164553f, -0.571353f, 0.000000f, 0.368043f,
1.000000f, 1.881400f, -0.000000f, 0.000000f, -0.940930f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_12bit_limited_rgb_to_yuv[] = {
0.224787f, 0.580149f, 0.050742f, 0.000000f, 0.062515f,
-0.122206f, -0.315401f, 0.437607f, 0.000000f, 0.500122f,
0.437607f, -0.402411f, -0.035196f, 0.000000f, 0.500122f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
const float BT2020_12bit_limited_yuv_to_rgb[] = {
1.168664f, -0.000000f, 1.684846f, 0.000000f, -0.915688f,
1.168664f, -0.188015f, -0.652816f, 0.000000f, 0.347458f,
1.168664f, 2.149647f, -0.000000f, 0.000000f, -1.148145f,
0.000000f, 0.000000f, 0.000000f, 1.000000f, 0.000000f,
};
static_assert(kJPEG_Full_SkYUVColorSpace == 0, "");
static_assert(kRec601_Limited_SkYUVColorSpace == 1, "");
static_assert(kRec709_Full_SkYUVColorSpace == 2, "");
static_assert(kRec709_Limited_SkYUVColorSpace == 3, "");
static_assert(kBT2020_8bit_Full_SkYUVColorSpace == 4, "");
static_assert(kBT2020_8bit_Limited_SkYUVColorSpace == 5, "");
static_assert(kBT2020_10bit_Full_SkYUVColorSpace == 6, "");
static_assert(kBT2020_10bit_Limited_SkYUVColorSpace == 7, "");
static_assert(kBT2020_12bit_Full_SkYUVColorSpace == 8, "");
static_assert(kBT2020_12bit_Limited_SkYUVColorSpace == 9, "");
const float* yuv_to_rgb_array[] = {
JPEG_full_yuv_to_rgb,
Rec601_limited_yuv_to_rgb,
Rec709_full_yuv_to_rgb,
Rec709_limited_yuv_to_rgb,
BT2020_8bit_full_yuv_to_rgb,
BT2020_8bit_limited_yuv_to_rgb,
BT2020_10bit_full_yuv_to_rgb,
BT2020_10bit_limited_yuv_to_rgb,
BT2020_12bit_full_yuv_to_rgb,
BT2020_12bit_limited_yuv_to_rgb,
};
const float* rgb_to_yuv_array[] = {
JPEG_full_rgb_to_yuv,
Rec601_limited_rgb_to_yuv,
Rec709_full_rgb_to_yuv,
Rec709_limited_rgb_to_yuv,
BT2020_8bit_full_rgb_to_yuv,
BT2020_8bit_limited_rgb_to_yuv,
BT2020_10bit_full_rgb_to_yuv,
BT2020_10bit_limited_rgb_to_yuv,
BT2020_12bit_full_rgb_to_yuv,
BT2020_12bit_limited_rgb_to_yuv,
};
constexpr size_t kSizeOfColorMatrix = 20 * sizeof(float);
void SkColorMatrix_RGB2YUV(SkYUVColorSpace cs, float m[20]) {
if ((unsigned)cs < (unsigned)kIdentity_SkYUVColorSpace) {
memcpy(m, rgb_to_yuv_array[(unsigned)cs], kSizeOfColorMatrix);
} else {
memset(m, 0, kSizeOfColorMatrix);
m[0] = m[6] = m[12] = m[18] = 1;
}
}
void SkColorMatrix_YUV2RGB(SkYUVColorSpace cs, float m[20]) {
if ((unsigned)cs < (unsigned)kIdentity_SkYUVColorSpace) {
memcpy(m, yuv_to_rgb_array[(unsigned)cs], kSizeOfColorMatrix);
} else {
memset(m, 0, kSizeOfColorMatrix);
m[0] = m[6] = m[12] = m[18] = 1;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// we just drop the alpha rol/col from the colormatrix
// output is | tr |
// | 3x3 tg |
// | tb |
// | 0 0 0 1 |
static void colormatrix_to_matrix44(const float src[20], SkM44* dst) {
*dst = SkM44(src[ 0], src[ 1], src[ 2], src[ 4],
src[ 5], src[ 6], src[ 7], src[ 9],
src[10], src[11], src[12], src[14],
0, 0, 0, 1);
}
// input: ignore the bottom row
// output: inject identity row/column for alpha
static void matrix44_to_colormatrix(const SkM44& src, float dst[20]) {
dst[0] = src.rc(0,0);
dst[1] = src.rc(0,1);
dst[2] = src.rc(0,2);
dst[3] = 0;
dst[4] = src.rc(0,3); // tx
dst[5] = src.rc(1,0);
dst[6] = src.rc(1,1);
dst[7] = src.rc(1,2);
dst[8] = 0;
dst[9] = src.rc(1,3); // ty
dst[10] = src.rc(2,0);
dst[11] = src.rc(2,1);
dst[12] = src.rc(2,2);
dst[13] = 0;
dst[14] = src.rc(2,3); // tz
dst[15] = dst[16] = dst[17] = dst[19] = 0;
dst[18] = 1;
}
static void scale3(float m[], float s) {
for (int i = 0; i < 3; ++i) {
m[i] *= s;
}
}
namespace {
enum Range { kFull, kLimited };
struct YUVCoeff {
float Kr, Kb;
int bits;
Range range;
};
const YUVCoeff gCoeff[] = {
{ 0.2990f, 0.1140f, 8, kFull }, // kJPEG_Full_SkYUVColorSpace
{ 0.2990f, 0.1140f, 8, kLimited }, // kRec601_Limited_SkYUVColorSpace
{ 0.2126f, 0.0722f, 8, kFull }, // kRec709_Full_SkYUVColorSpace
{ 0.2126f, 0.0722f, 8, kLimited }, // kRec709_Limited_SkYUVColorSpace
{ 0.2627f, 0.0593f, 8, kFull }, // kBT2020_8bit_Full_SkYUVColorSpace
{ 0.2627f, 0.0593f, 8, kLimited }, // kBT2020_8bit_Limited_SkYUVColorSpace
{ 0.2627f, 0.0593f, 10, kFull }, // kBT2020_10bit_Full_SkYUVColorSpace
{ 0.2627f, 0.0593f, 10, kLimited }, // kBT2020_10bit_Limited_SkYUVColorSpace
{ 0.2627f, 0.0593f, 12, kFull }, // kBT2020_12bit_Full_SkYUVColorSpace
{ 0.2627f, 0.0593f, 12, kLimited }, // kBT2020_12bit_Limited_SkYUVColorSpace
};
} // namespace
static void make_rgb_to_yuv_matrix(float mx[20], const YUVCoeff& c) {
SkASSERT(c.bits >= 8);
const float Kr = c.Kr;
const float Kb = c.Kb;
const float Kg = 1.0f - Kr - Kb;
const float Cr = 0.5f / (1.0f - Kb);
const float Cb = 0.5f / (1.0f - Kr);
const int shift = c.bits - 8;
const float denom = static_cast<float>((1 << c.bits) - 1);
float scaleY = 1.0f,
addY = 0.0f,
scaleUV = 1.0f,
addUV = (128 << shift) / denom;
if (c.range == kLimited) {
scaleY = (219 << shift) / denom;
addY = ( 16 << shift) / denom;
scaleUV = (224 << shift) / denom;
}
float m[20] = {
Kr, Kg, Kb, 0, addY,
-Kr, -Kg, 1-Kb, 0, addUV,
1-Kr, -Kg, -Kb, 0, addUV,
0, 0, 0, 1, 0,
};
memcpy(mx, m, sizeof(m));
scale3(mx + 0, scaleY );
scale3(mx + 5, Cr * scaleUV);
scale3(mx + 10, Cb * scaleUV);
}
static void dump(const float m[20], SkYUVColorSpace cs, bool rgb2yuv) {
const char* names[] = {
"JPEG_full",
"Rec601_limited",
"Rec709_full",
"Rec709_limited",
"BT2020_8bit_full",
"BT2020_8bit_limited",
"BT2020_10bit_full",
"BT2020_10bit_limited",
"BT2020_12bit_full",
"BT2020_12bit_limited",
};
const char* dirnames[] = {
"yuv_to_rgb", "rgb_to_yuv",
};
SkDebugf("const float %s_%s[] = {\n", names[cs], dirnames[rgb2yuv]);
for (int i = 0; i < 4; ++i) {
SkDebugf(" ");
for (int j = 0; j < 5; ++j) {
SkDebugf(" %9.6ff,", m[i * 5 + j]);
}
SkDebugf("\n");
}
SkDebugf("};\n");
}
// Used to create the prebuilt tables for each colorspace.
// Don't remove this function, in case we want to recompute those tables in the future.
void SkColorMatrix_DumpYUVMatrixTables() {
for (int i = 0; i < kLastEnum_SkYUVColorSpace; ++i) {
SkYUVColorSpace cs = static_cast<SkYUVColorSpace>(i);
float m[20];
make_rgb_to_yuv_matrix(m, gCoeff[(unsigned)cs]);
dump(m, cs, true);
SkM44 m44, im44;
colormatrix_to_matrix44(m, &m44);
float im[20];
#ifdef SK_DEBUG
// be sure our coversion between matrix44 and colormatrix is perfect
matrix44_to_colormatrix(m44, im);
SkASSERT(memcmp(m, im, sizeof(im)) == 0);
#endif
SkAssertResult(m44.invert(&im44));
matrix44_to_colormatrix(im44, im);
dump(im, cs, false);
}
}