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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrYUVtoRGBEffect.h"
#include "GrCoordTransform.h"
#include "GrInvariantOutput.h"
#include "GrProcessor.h"
#include "gl/GrGLFragmentProcessor.h"
#include "gl/builders/GrGLProgramBuilder.h"
namespace {
class YUVtoRGBEffect : public GrFragmentProcessor {
public:
static GrFragmentProcessor* Create(GrProcessorDataManager* procDataManager, GrTexture* yTexture,
GrTexture* uTexture, GrTexture* vTexture,
const SkISize sizes[3], SkYUVColorSpace colorSpace) {
SkScalar w[3], h[3];
w[0] = SkIntToScalar(sizes[0].fWidth) / SkIntToScalar(yTexture->width());
h[0] = SkIntToScalar(sizes[0].fHeight) / SkIntToScalar(yTexture->height());
w[1] = SkIntToScalar(sizes[1].fWidth) / SkIntToScalar(uTexture->width());
h[1] = SkIntToScalar(sizes[1].fHeight) / SkIntToScalar(uTexture->height());
w[2] = SkIntToScalar(sizes[2].fWidth) / SkIntToScalar(vTexture->width());
h[2] = SkIntToScalar(sizes[2].fHeight) / SkIntToScalar(vTexture->height());
SkMatrix yuvMatrix[3];
yuvMatrix[0] = GrCoordTransform::MakeDivByTextureWHMatrix(yTexture);
yuvMatrix[1] = yuvMatrix[0];
yuvMatrix[1].preScale(w[1] / w[0], h[1] / h[0]);
yuvMatrix[2] = yuvMatrix[0];
yuvMatrix[2].preScale(w[2] / w[0], h[2] / h[0]);
GrTextureParams::FilterMode uvFilterMode =
((sizes[1].fWidth != sizes[0].fWidth) ||
(sizes[1].fHeight != sizes[0].fHeight) ||
(sizes[2].fWidth != sizes[0].fWidth) ||
(sizes[2].fHeight != sizes[0].fHeight)) ?
GrTextureParams::kBilerp_FilterMode :
GrTextureParams::kNone_FilterMode;
return new YUVtoRGBEffect(procDataManager, yTexture, uTexture, vTexture, yuvMatrix,
uvFilterMode, colorSpace);
}
const char* name() const override { return "YUV to RGB"; }
SkYUVColorSpace getColorSpace() const {
return fColorSpace;
}
class GLProcessor : public GrGLFragmentProcessor {
public:
static const GrGLfloat kJPEGConversionMatrix[16];
static const GrGLfloat kRec601ConversionMatrix[16];
static const GrGLfloat kRec709ConversionMatrix[16];
// this class always generates the same code.
static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) {}
GLProcessor(const GrProcessor&) {}
virtual void emitCode(EmitArgs& args) override {
GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
const char* yuvMatrix = NULL;
fMatrixUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kMat44f_GrSLType, kDefault_GrSLPrecision,
"YUVMatrix", &yuvMatrix);
fsBuilder->codeAppendf("\t%s = vec4(\n\t\t", args.fOutputColor);
fsBuilder->appendTextureLookup(args.fSamplers[0], args.fCoords[0].c_str(),
args.fCoords[0].getType());
fsBuilder->codeAppend(".r,\n\t\t");
fsBuilder->appendTextureLookup(args.fSamplers[1], args.fCoords[1].c_str(),
args.fCoords[1].getType());
fsBuilder->codeAppend(".r,\n\t\t");
fsBuilder->appendTextureLookup(args.fSamplers[2], args.fCoords[2].c_str(),
args.fCoords[2].getType());
fsBuilder->codeAppendf(".r,\n\t\t1.0) * %s;\n", yuvMatrix);
}
protected:
virtual void onSetData(const GrGLProgramDataManager& pdman,
const GrProcessor& processor) override {
const YUVtoRGBEffect& yuvEffect = processor.cast<YUVtoRGBEffect>();
switch (yuvEffect.getColorSpace()) {
case kJPEG_SkYUVColorSpace:
pdman.setMatrix4f(fMatrixUni, kJPEGConversionMatrix);
break;
case kRec601_SkYUVColorSpace:
pdman.setMatrix4f(fMatrixUni, kRec601ConversionMatrix);
break;
case kRec709_SkYUVColorSpace:
pdman.setMatrix4f(fMatrixUni, kRec709ConversionMatrix);
break;
}
}
private:
GrGLProgramDataManager::UniformHandle fMatrixUni;
typedef GrGLFragmentProcessor INHERITED;
};
private:
YUVtoRGBEffect(GrProcessorDataManager*, GrTexture* yTexture, GrTexture* uTexture,
GrTexture* vTexture, const SkMatrix yuvMatrix[3],
GrTextureParams::FilterMode uvFilterMode, SkYUVColorSpace colorSpace)
: fYTransform(kLocal_GrCoordSet, yuvMatrix[0], yTexture, GrTextureParams::kNone_FilterMode)
, fYAccess(yTexture)
, fUTransform(kLocal_GrCoordSet, yuvMatrix[1], uTexture, uvFilterMode)
, fUAccess(uTexture, uvFilterMode)
, fVTransform(kLocal_GrCoordSet, yuvMatrix[2], vTexture, uvFilterMode)
, fVAccess(vTexture, uvFilterMode)
, fColorSpace(colorSpace) {
this->initClassID<YUVtoRGBEffect>();
this->addCoordTransform(&fYTransform);
this->addTextureAccess(&fYAccess);
this->addCoordTransform(&fUTransform);
this->addTextureAccess(&fUAccess);
this->addCoordTransform(&fVTransform);
this->addTextureAccess(&fVAccess);
}
GrGLFragmentProcessor* onCreateGLInstance() const override { return new GLProcessor(*this); }
virtual void onGetGLProcessorKey(const GrGLSLCaps& caps,
GrProcessorKeyBuilder* b) const override {
GLProcessor::GenKey(*this, caps, b);
}
bool onIsEqual(const GrFragmentProcessor& sBase) const override {
const YUVtoRGBEffect& s = sBase.cast<YUVtoRGBEffect>();
return fColorSpace == s.getColorSpace();
}
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
// YUV is opaque
inout->setToOther(kA_GrColorComponentFlag, 0xFF << GrColor_SHIFT_A,
GrInvariantOutput::kWillNot_ReadInput);
}
GrCoordTransform fYTransform;
GrTextureAccess fYAccess;
GrCoordTransform fUTransform;
GrTextureAccess fUAccess;
GrCoordTransform fVTransform;
GrTextureAccess fVAccess;
SkYUVColorSpace fColorSpace;
typedef GrFragmentProcessor INHERITED;
};
const GrGLfloat YUVtoRGBEffect::GLProcessor::kJPEGConversionMatrix[16] = {
1.0f, 0.0f, 1.402f, -0.701f,
1.0f, -0.34414f, -0.71414f, 0.529f,
1.0f, 1.772f, 0.0f, -0.886f,
0.0f, 0.0f, 0.0f, 1.0};
const GrGLfloat YUVtoRGBEffect::GLProcessor::kRec601ConversionMatrix[16] = {
1.164f, 0.0f, 1.596f, -0.87075f,
1.164f, -0.391f, -0.813f, 0.52925f,
1.164f, 2.018f, 0.0f, -1.08175f,
0.0f, 0.0f, 0.0f, 1.0};
const GrGLfloat YUVtoRGBEffect::GLProcessor::kRec709ConversionMatrix[16] = {
1.164f, 0.0f, 1.793f, -0.96925f,
1.164f, -0.213f, -0.533f, 0.30025f,
1.164f, 2.112f, 0.0f, -1.12875f,
0.0f, 0.0f, 0.0f, 1.0f};
}
//////////////////////////////////////////////////////////////////////////////
GrFragmentProcessor*
GrYUVtoRGBEffect::Create(GrProcessorDataManager* procDataManager, GrTexture* yTexture,
GrTexture* uTexture, GrTexture* vTexture, const SkISize sizes[3],
SkYUVColorSpace colorSpace) {
SkASSERT(procDataManager && yTexture && uTexture && vTexture && sizes);
return YUVtoRGBEffect::Create(procDataManager, yTexture, uTexture, vTexture, sizes, colorSpace);
}
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