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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrConfigConversionEffect.h"
#include "../private/GrGLSL.h"
#include "GrClip.h"
#include "GrContext.h"
#include "GrRenderTargetContext.h"
#include "SkMatrix.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
class GrGLConfigConversionEffect : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs& args) override {
const GrConfigConversionEffect& cce = args.fFp.cast<GrConfigConversionEffect>();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// Use highp throughout the shader to avoid some precision issues on specific GPUs.
fragBuilder->elevateDefaultPrecision(kHigh_GrSLPrecision);
if (nullptr == args.fInputColor) {
// could optimize this case, but we aren't for now.
args.fInputColor = "vec4(1)";
}
// Aggressively round to the nearest exact (N / 255) floating point value. This lets us
// find a round-trip preserving pair on some GPUs that do odd byte to float conversion.
fragBuilder->codeAppendf("vec4 color = floor(%s * 255.0 + 0.5) / 255.0;", args.fInputColor);
switch (cce.pmConversion()) {
case GrConfigConversionEffect::kToPremul_PMConversion:
fragBuilder->codeAppend(
"color.rgb = floor(color.rgb * color.a * 255.0 + 0.5) / 255.0;");
break;
case GrConfigConversionEffect::kToUnpremul_PMConversion:
fragBuilder->codeAppend(
"color.rgb = color.a <= 0.0 ? vec3(0,0,0) : floor(color.rgb / color.a * 255.0 + 0.5) / 255.0;");
break;
default:
SkFAIL("Unknown conversion op.");
break;
}
fragBuilder->codeAppendf("%s = color;", args.fOutputColor);
}
static inline void GenKey(const GrProcessor& processor, const GrShaderCaps&,
GrProcessorKeyBuilder* b) {
const GrConfigConversionEffect& cce = processor.cast<GrConfigConversionEffect>();
uint32_t key = cce.pmConversion();
b->add32(key);
}
private:
typedef GrGLSLFragmentProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
GrConfigConversionEffect::GrConfigConversionEffect(PMConversion pmConversion)
: INHERITED(kNone_OptimizationFlags)
, fPMConversion(pmConversion) {
this->initClassID<GrConfigConversionEffect>();
}
bool GrConfigConversionEffect::onIsEqual(const GrFragmentProcessor& s) const {
const GrConfigConversionEffect& other = s.cast<GrConfigConversionEffect>();
return other.fPMConversion == fPMConversion;
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrConfigConversionEffect);
#if GR_TEST_UTILS
sk_sp<GrFragmentProcessor> GrConfigConversionEffect::TestCreate(GrProcessorTestData* d) {
PMConversion pmConv = static_cast<PMConversion>(d->fRandom->nextULessThan(kPMConversionCnt));
return sk_sp<GrFragmentProcessor>(new GrConfigConversionEffect(pmConv));
}
#endif
///////////////////////////////////////////////////////////////////////////////
void GrConfigConversionEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLConfigConversionEffect::GenKey(*this, caps, b);
}
GrGLSLFragmentProcessor* GrConfigConversionEffect::onCreateGLSLInstance() const {
return new GrGLConfigConversionEffect();
}
bool GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context) {
static constexpr int kSize = 256;
static constexpr GrPixelConfig kConfig = kRGBA_8888_GrPixelConfig;
SkAutoTMalloc<uint32_t> data(kSize * kSize * 3);
uint32_t* srcData = data.get();
uint32_t* firstRead = data.get() + kSize * kSize;
uint32_t* secondRead = data.get() + 2 * kSize * kSize;
// Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
// values in row y. We set r,g, and b to the same value since they are handled identically.
for (int y = 0; y < kSize; ++y) {
for (int x = 0; x < kSize; ++x) {
uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[kSize*y + x]);
color[3] = y;
color[2] = SkTMin(x, y);
color[1] = SkTMin(x, y);
color[0] = SkTMin(x, y);
}
}
const SkImageInfo ii = SkImageInfo::Make(kSize, kSize,
kRGBA_8888_SkColorType, kPremul_SkAlphaType);
sk_sp<GrRenderTargetContext> readRTC(context->makeDeferredRenderTargetContext(
SkBackingFit::kExact,
kSize, kSize,
kConfig, nullptr));
sk_sp<GrRenderTargetContext> tempRTC(context->makeDeferredRenderTargetContext(
SkBackingFit::kExact,
kSize, kSize,
kConfig, nullptr));
if (!readRTC || !readRTC->asTextureProxy() || !tempRTC) {
return false;
}
GrSurfaceDesc desc;
desc.fWidth = kSize;
desc.fHeight = kSize;
desc.fConfig = kConfig;
sk_sp<GrTextureProxy> dataProxy = GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
desc,
SkBudgeted::kYes, data, 0);
if (!dataProxy) {
return false;
}
static const SkRect kRect = SkRect::MakeIWH(kSize, kSize);
// We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
// from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
// We then verify that two reads produced the same values.
GrPaint paint1;
GrPaint paint2;
GrPaint paint3;
sk_sp<GrFragmentProcessor> pmToUPM(new GrConfigConversionEffect(kToUnpremul_PMConversion));
sk_sp<GrFragmentProcessor> upmToPM(new GrConfigConversionEffect(kToPremul_PMConversion));
paint1.addColorTextureProcessor(dataProxy, nullptr, SkMatrix::I());
paint1.addColorFragmentProcessor(pmToUPM);
paint1.setPorterDuffXPFactory(SkBlendMode::kSrc);
readRTC->fillRectToRect(GrNoClip(), std::move(paint1), GrAA::kNo, SkMatrix::I(), kRect, kRect);
if (!readRTC->readPixels(ii, firstRead, 0, 0, 0)) {
return false;
}
paint2.addColorTextureProcessor(readRTC->asTextureProxyRef(), nullptr,
SkMatrix::I());
paint2.addColorFragmentProcessor(std::move(upmToPM));
paint2.setPorterDuffXPFactory(SkBlendMode::kSrc);
tempRTC->fillRectToRect(GrNoClip(), std::move(paint2), GrAA::kNo, SkMatrix::I(), kRect, kRect);
paint3.addColorTextureProcessor(tempRTC->asTextureProxyRef(), nullptr,
SkMatrix::I());
paint3.addColorFragmentProcessor(std::move(pmToUPM));
paint3.setPorterDuffXPFactory(SkBlendMode::kSrc);
readRTC->fillRectToRect(GrNoClip(), std::move(paint3), GrAA::kNo, SkMatrix::I(), kRect, kRect);
if (!readRTC->readPixels(ii, secondRead, 0, 0, 0)) {
return false;
}
for (int y = 0; y < kSize; ++y) {
for (int x = 0; x <= y; ++x) {
if (firstRead[kSize * y + x] != secondRead[kSize * y + x]) {
return false;
}
}
}
return true;
}
sk_sp<GrFragmentProcessor> GrConfigConversionEffect::Make(sk_sp<GrFragmentProcessor> fp,
PMConversion pmConversion) {
if (!fp) {
return nullptr;
}
sk_sp<GrFragmentProcessor> ccFP(new GrConfigConversionEffect(pmConversion));
sk_sp<GrFragmentProcessor> fpPipeline[] = { fp, ccFP };
return GrFragmentProcessor::RunInSeries(fpPipeline, 2);
}
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