| /* |
| * 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( |
| GrTexture* texture, |
| sk_sp<GrColorSpaceXform> colorSpaceXform, |
| GrTexture* maskTexture, |
| float innerThreshold, |
| float outerThreshold, |
| const SkIRect& bounds) |
| : INHERITED(OptFlags(outerThreshold)) |
| , fInnerThreshold(innerThreshold) |
| , fOuterThreshold(outerThreshold) |
| , fImageCoordTransform(SkMatrix::I(), texture, GrSamplerParams::kNone_FilterMode) |
| , fImageTextureSampler(texture) |
| , fColorSpaceXform(std::move(colorSpaceXform)) |
| , fMaskCoordTransform( |
| SkMatrix::MakeTrans(SkIntToScalar(-bounds.x()), SkIntToScalar(-bounds.y())), |
| maskTexture, |
| GrSamplerParams::kNone_FilterMode) |
| , fMaskTextureSampler(maskTexture) { |
| this->initClassID<GrAlphaThresholdFragmentProcessor>(); |
| this->addCoordTransform(&fImageCoordTransform); |
| this->addTextureSampler(&fImageTextureSampler); |
| this->addCoordTransform(&fMaskCoordTransform); |
| this->addTextureSampler(&fMaskTextureSampler); |
| } |
| |
| GrAlphaThresholdFragmentProcessor::GrAlphaThresholdFragmentProcessor( |
| GrContext* context, |
| 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(context, SkMatrix::I(), proxy.get(), |
| GrSamplerParams::kNone_FilterMode) |
| , fImageTextureSampler(context->textureProvider(), std::move(proxy)) |
| , fColorSpaceXform(std::move(colorSpaceXform)) |
| , fMaskCoordTransform( |
| context, |
| SkMatrix::MakeTrans(SkIntToScalar(-bounds.x()), SkIntToScalar(-bounds.y())), |
| maskProxy.get(), |
| GrSamplerParams::kNone_FilterMode) |
| , fMaskTextureSampler(context->textureProvider(), 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; |
| GrGLSLProgramDataManager::UniformHandle fColorSpaceXformVar; |
| 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>(); |
| GrGLSLColorSpaceXformHelper colorSpaceHelper(uniformHandler, atfp.colorSpaceXform(), |
| &fColorSpaceXformVar); |
| |
| 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, |
| &colorSpaceHelper); |
| 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())) { |
| pdman.setSkMatrix44(fColorSpaceXformVar, atfp.colorSpaceXform()->srcToDst()); |
| } |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| 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->context(), |
| 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 |