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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrAlphaThresholdFragmentProcessor.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "SkRefCnt.h"
#include "glsl/GrGLSLColorSpaceXformHelper.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "../private/GrGLSL.h"
inline GrFragmentProcessor::OptimizationFlags GrAlphaThresholdFragmentProcessor::OptFlags(float outerThreshold) {
if (outerThreshold >= 1.f) {
return kPreservesOpaqueInput_OptimizationFlag |
kCompatibleWithCoverageAsAlpha_OptimizationFlag;
} else {
return kCompatibleWithCoverageAsAlpha_OptimizationFlag;
}
}
GrAlphaThresholdFragmentProcessor::GrAlphaThresholdFragmentProcessor(
GrResourceProvider* resourceProvider,
sk_sp<GrTextureProxy> proxy,
sk_sp<GrColorSpaceXform> colorSpaceXform,
sk_sp<GrTextureProxy> maskProxy,
float innerThreshold,
float outerThreshold,
const SkIRect& bounds)
: INHERITED(OptFlags(outerThreshold))
, fInnerThreshold(innerThreshold)
, fOuterThreshold(outerThreshold)
, fImageCoordTransform(resourceProvider, SkMatrix::I(), proxy.get(),
GrSamplerParams::kNone_FilterMode)
, fImageTextureSampler(resourceProvider, std::move(proxy))
, fColorSpaceXform(std::move(colorSpaceXform))
, fMaskCoordTransform(
resourceProvider,
SkMatrix::MakeTrans(SkIntToScalar(-bounds.x()), SkIntToScalar(-bounds.y())),
maskProxy.get(),
GrSamplerParams::kNone_FilterMode)
, fMaskTextureSampler(resourceProvider, maskProxy) {
this->initClassID<GrAlphaThresholdFragmentProcessor>();
this->addCoordTransform(&fImageCoordTransform);
this->addTextureSampler(&fImageTextureSampler);
this->addCoordTransform(&fMaskCoordTransform);
this->addTextureSampler(&fMaskTextureSampler);
}
bool GrAlphaThresholdFragmentProcessor::onIsEqual(const GrFragmentProcessor& sBase) const {
const GrAlphaThresholdFragmentProcessor& s = sBase.cast<GrAlphaThresholdFragmentProcessor>();
return (this->fInnerThreshold == s.fInnerThreshold &&
this->fOuterThreshold == s.fOuterThreshold);
}
///////////////////////////////////////////////////////////////////////////////
class GrGLAlphaThresholdFragmentProcessor : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs&) override;
static inline void GenKey(const GrProcessor& effect, const GrShaderCaps&,
GrProcessorKeyBuilder* b) {
const GrAlphaThresholdFragmentProcessor& atfp =
effect.cast<GrAlphaThresholdFragmentProcessor>();
b->add32(GrColorSpaceXform::XformKey(atfp.colorSpaceXform()));
}
protected:
void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override;
private:
GrGLSLProgramDataManager::UniformHandle fInnerThresholdVar;
GrGLSLProgramDataManager::UniformHandle fOuterThresholdVar;
GrGLSLColorSpaceXformHelper fColorSpaceHelper;
typedef GrGLSLFragmentProcessor INHERITED;
};
void GrGLAlphaThresholdFragmentProcessor::emitCode(EmitArgs& args) {
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fInnerThresholdVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"inner_threshold");
fOuterThresholdVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"outer_threshold");
const GrAlphaThresholdFragmentProcessor& atfp =
args.fFp.cast<GrAlphaThresholdFragmentProcessor>();
fColorSpaceHelper.emitCode(uniformHandler, atfp.colorSpaceXform());
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
SkString maskCoords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[1]);
fragBuilder->codeAppendf("vec2 coord = %s;", coords2D.c_str());
fragBuilder->codeAppendf("vec2 mask_coord = %s;", maskCoords2D.c_str());
fragBuilder->codeAppend("vec4 input_color = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord", kVec2f_GrSLType,
&fColorSpaceHelper);
fragBuilder->codeAppend(";");
fragBuilder->codeAppend("vec4 mask_color = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[1], "mask_coord");
fragBuilder->codeAppend(";");
fragBuilder->codeAppendf("float inner_thresh = %s;",
uniformHandler->getUniformCStr(fInnerThresholdVar));
fragBuilder->codeAppendf("float outer_thresh = %s;",
uniformHandler->getUniformCStr(fOuterThresholdVar));
fragBuilder->codeAppend("float mask = mask_color.a;");
fragBuilder->codeAppend("vec4 color = input_color;");
fragBuilder->codeAppend("if (mask < 0.5) {"
"if (color.a > outer_thresh) {"
"float scale = outer_thresh / color.a;"
"color.rgb *= scale;"
"color.a = outer_thresh;"
"}"
"} else if (color.a < inner_thresh) {"
"float scale = inner_thresh / max(0.001, color.a);"
"color.rgb *= scale;"
"color.a = inner_thresh;"
"}");
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor,
(GrGLSLExpr4(args.fInputColor) * GrGLSLExpr4("color")).c_str());
}
void GrGLAlphaThresholdFragmentProcessor::onSetData(const GrGLSLProgramDataManager& pdman,
const GrProcessor& proc) {
const GrAlphaThresholdFragmentProcessor& atfp = proc.cast<GrAlphaThresholdFragmentProcessor>();
pdman.set1f(fInnerThresholdVar, atfp.innerThreshold());
pdman.set1f(fOuterThresholdVar, atfp.outerThreshold());
if (SkToBool(atfp.colorSpaceXform())) {
fColorSpaceHelper.setData(pdman, atfp.colorSpaceXform());
}
}
/////////////////////////////////////////////////////////////////////
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrAlphaThresholdFragmentProcessor);
#if GR_TEST_UTILS
sk_sp<GrFragmentProcessor> GrAlphaThresholdFragmentProcessor::TestCreate(GrProcessorTestData* d) {
sk_sp<GrTextureProxy> bmpProxy = d->textureProxy(GrProcessorUnitTest::kSkiaPMTextureIdx);
sk_sp<GrTextureProxy> maskProxy = d->textureProxy(GrProcessorUnitTest::kAlphaTextureIdx);
// Make the inner and outer thresholds be in (0, 1) exclusive and be sorted correctly.
float innerThresh = d->fRandom->nextUScalar1() * .99f + 0.005f;
float outerThresh = d->fRandom->nextUScalar1() * .99f + 0.005f;
const int kMaxWidth = 1000;
const int kMaxHeight = 1000;
uint32_t width = d->fRandom->nextULessThan(kMaxWidth);
uint32_t height = d->fRandom->nextULessThan(kMaxHeight);
uint32_t x = d->fRandom->nextULessThan(kMaxWidth - width);
uint32_t y = d->fRandom->nextULessThan(kMaxHeight - height);
SkIRect bounds = SkIRect::MakeXYWH(x, y, width, height);
sk_sp<GrColorSpaceXform> colorSpaceXform = GrTest::TestColorXform(d->fRandom);
return GrAlphaThresholdFragmentProcessor::Make(d->resourceProvider(),
std::move(bmpProxy),
std::move(colorSpaceXform),
std::move(maskProxy),
innerThresh, outerThresh,
bounds);
}
#endif
///////////////////////////////////////////////////////////////////////////////
void GrAlphaThresholdFragmentProcessor::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
GrGLAlphaThresholdFragmentProcessor::GenKey(*this, caps, b);
}
GrGLSLFragmentProcessor* GrAlphaThresholdFragmentProcessor::onCreateGLSLInstance() const {
return new GrGLAlphaThresholdFragmentProcessor;
}
#endif
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