| /* | |
| * Copyright 2013 Google Inc. | |
| * | |
| * Use of this source code is governed by a BSD-style license that can be | |
| * found in the LICENSE file. | |
| */ | |
| #include "SkAlphaThresholdFilter.h" | |
| #include "SkBitmap.h" | |
| #include "SkReadBuffer.h" | |
| #include "SkWriteBuffer.h" | |
| #include "SkRegion.h" | |
| #if SK_SUPPORT_GPU | |
| #include "GrDrawContext.h" | |
| #endif | |
| class SK_API SkAlphaThresholdFilterImpl : public SkImageFilter { | |
| public: | |
| SkAlphaThresholdFilterImpl(const SkRegion& region, SkScalar innerThreshold, | |
| SkScalar outerThreshold, SkImageFilter* input); | |
| SK_TO_STRING_OVERRIDE() | |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAlphaThresholdFilterImpl) | |
| protected: | |
| void flatten(SkWriteBuffer&) const override; | |
| virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&, | |
| SkBitmap* result, SkIPoint* offset) const override; | |
| #if SK_SUPPORT_GPU | |
| virtual bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&, | |
| const SkIRect& bounds) const override; | |
| #endif | |
| private: | |
| SkRegion fRegion; | |
| SkScalar fInnerThreshold; | |
| SkScalar fOuterThreshold; | |
| typedef SkImageFilter INHERITED; | |
| }; | |
| SkImageFilter* SkAlphaThresholdFilter::Create(const SkRegion& region, | |
| SkScalar innerThreshold, | |
| SkScalar outerThreshold, | |
| SkImageFilter* input) { | |
| return SkNEW_ARGS(SkAlphaThresholdFilterImpl, (region, innerThreshold, outerThreshold, input)); | |
| } | |
| #if SK_SUPPORT_GPU | |
| #include "GrContext.h" | |
| #include "GrCoordTransform.h" | |
| #include "GrFragmentProcessor.h" | |
| #include "GrInvariantOutput.h" | |
| #include "GrTextureAccess.h" | |
| #include "effects/GrPorterDuffXferProcessor.h" | |
| #include "SkGr.h" | |
| #include "gl/GrGLProcessor.h" | |
| #include "gl/builders/GrGLProgramBuilder.h" | |
| class AlphaThresholdEffect : public GrFragmentProcessor { | |
| public: | |
| static GrFragmentProcessor* Create(GrTexture* texture, | |
| GrTexture* maskTexture, | |
| float innerThreshold, | |
| float outerThreshold) { | |
| return SkNEW_ARGS(AlphaThresholdEffect, (texture, | |
| maskTexture, | |
| innerThreshold, | |
| outerThreshold)); | |
| } | |
| virtual ~AlphaThresholdEffect() {}; | |
| const char* name() const override { return "Alpha Threshold"; } | |
| float innerThreshold() const { return fInnerThreshold; } | |
| float outerThreshold() const { return fOuterThreshold; } | |
| void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; | |
| GrGLFragmentProcessor* createGLInstance() const override; | |
| private: | |
| AlphaThresholdEffect(GrTexture* texture, | |
| GrTexture* maskTexture, | |
| float innerThreshold, | |
| float outerThreshold) | |
| : fInnerThreshold(innerThreshold) | |
| , fOuterThreshold(outerThreshold) | |
| , fImageCoordTransform(kLocal_GrCoordSet, | |
| GrCoordTransform::MakeDivByTextureWHMatrix(texture), texture, | |
| GrTextureParams::kNone_FilterMode) | |
| , fImageTextureAccess(texture) | |
| , fMaskCoordTransform(kLocal_GrCoordSet, | |
| GrCoordTransform::MakeDivByTextureWHMatrix(maskTexture), maskTexture, | |
| GrTextureParams::kNone_FilterMode) | |
| , fMaskTextureAccess(maskTexture) { | |
| this->initClassID<AlphaThresholdEffect>(); | |
| this->addCoordTransform(&fImageCoordTransform); | |
| this->addTextureAccess(&fImageTextureAccess); | |
| this->addCoordTransform(&fMaskCoordTransform); | |
| this->addTextureAccess(&fMaskTextureAccess); | |
| } | |
| bool onIsEqual(const GrFragmentProcessor&) const override; | |
| void onComputeInvariantOutput(GrInvariantOutput* inout) const override; | |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST; | |
| float fInnerThreshold; | |
| float fOuterThreshold; | |
| GrCoordTransform fImageCoordTransform; | |
| GrTextureAccess fImageTextureAccess; | |
| GrCoordTransform fMaskCoordTransform; | |
| GrTextureAccess fMaskTextureAccess; | |
| typedef GrFragmentProcessor INHERITED; | |
| }; | |
| class GrGLAlphaThresholdEffect : public GrGLFragmentProcessor { | |
| public: | |
| GrGLAlphaThresholdEffect(const GrFragmentProcessor&) {} | |
| virtual void emitCode(GrGLFPBuilder*, | |
| const GrFragmentProcessor&, | |
| const char* outputColor, | |
| const char* inputColor, | |
| const TransformedCoordsArray&, | |
| const TextureSamplerArray&) override; | |
| void setData(const GrGLProgramDataManager&, const GrProcessor&) override; | |
| private: | |
| GrGLProgramDataManager::UniformHandle fInnerThresholdVar; | |
| GrGLProgramDataManager::UniformHandle fOuterThresholdVar; | |
| typedef GrGLFragmentProcessor INHERITED; | |
| }; | |
| void GrGLAlphaThresholdEffect::emitCode(GrGLFPBuilder* builder, | |
| const GrFragmentProcessor&, | |
| const char* outputColor, | |
| const char* inputColor, | |
| const TransformedCoordsArray& coords, | |
| const TextureSamplerArray& samplers) { | |
| fInnerThresholdVar = builder->addUniform( | |
| GrGLProgramBuilder::kFragment_Visibility, | |
| kFloat_GrSLType, kDefault_GrSLPrecision, | |
| "inner_threshold"); | |
| fOuterThresholdVar = builder->addUniform( | |
| GrGLProgramBuilder::kFragment_Visibility, | |
| kFloat_GrSLType, kDefault_GrSLPrecision, | |
| "outer_threshold"); | |
| GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); | |
| SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0); | |
| SkString maskCoords2D = fsBuilder->ensureFSCoords2D(coords, 1); | |
| fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); | |
| fsBuilder->codeAppendf("\t\tvec2 mask_coord = %s;\n", maskCoords2D.c_str()); | |
| fsBuilder->codeAppend("\t\tvec4 input_color = "); | |
| fsBuilder->appendTextureLookup(samplers[0], "coord"); | |
| fsBuilder->codeAppend(";\n"); | |
| fsBuilder->codeAppend("\t\tvec4 mask_color = "); | |
| fsBuilder->appendTextureLookup(samplers[1], "mask_coord"); | |
| fsBuilder->codeAppend(";\n"); | |
| fsBuilder->codeAppendf("\t\tfloat inner_thresh = %s;\n", | |
| builder->getUniformCStr(fInnerThresholdVar)); | |
| fsBuilder->codeAppendf("\t\tfloat outer_thresh = %s;\n", | |
| builder->getUniformCStr(fOuterThresholdVar)); | |
| fsBuilder->codeAppend("\t\tfloat mask = mask_color.a;\n"); | |
| fsBuilder->codeAppend("vec4 color = input_color;\n"); | |
| fsBuilder->codeAppend("\t\tif (mask < 0.5) {\n" | |
| "\t\t\tif (color.a > outer_thresh) {\n" | |
| "\t\t\t\tfloat scale = outer_thresh / color.a;\n" | |
| "\t\t\t\tcolor.rgb *= scale;\n" | |
| "\t\t\t\tcolor.a = outer_thresh;\n" | |
| "\t\t\t}\n" | |
| "\t\t} else if (color.a < inner_thresh) {\n" | |
| "\t\t\tfloat scale = inner_thresh / max(0.001, color.a);\n" | |
| "\t\t\tcolor.rgb *= scale;\n" | |
| "\t\t\tcolor.a = inner_thresh;\n" | |
| "\t\t}\n"); | |
| fsBuilder->codeAppendf("%s = %s;\n", outputColor, | |
| (GrGLSLExpr4(inputColor) * GrGLSLExpr4("color")).c_str()); | |
| } | |
| void GrGLAlphaThresholdEffect::setData(const GrGLProgramDataManager& pdman, | |
| const GrProcessor& proc) { | |
| const AlphaThresholdEffect& alpha_threshold = proc.cast<AlphaThresholdEffect>(); | |
| pdman.set1f(fInnerThresholdVar, alpha_threshold.innerThreshold()); | |
| pdman.set1f(fOuterThresholdVar, alpha_threshold.outerThreshold()); | |
| } | |
| ///////////////////////////////////////////////////////////////////// | |
| GR_DEFINE_FRAGMENT_PROCESSOR_TEST(AlphaThresholdEffect); | |
| GrFragmentProcessor* AlphaThresholdEffect::TestCreate(SkRandom* random, | |
| GrContext* context, | |
| const GrCaps&, | |
| GrTexture** textures) { | |
| GrTexture* bmpTex = textures[GrProcessorUnitTest::kSkiaPMTextureIdx]; | |
| GrTexture* maskTex = textures[GrProcessorUnitTest::kAlphaTextureIdx]; | |
| float inner_thresh = random->nextUScalar1(); | |
| float outer_thresh = random->nextUScalar1(); | |
| return AlphaThresholdEffect::Create(bmpTex, maskTex, inner_thresh, outer_thresh); | |
| } | |
| /////////////////////////////////////////////////////////////////////////////// | |
| void AlphaThresholdEffect::getGLProcessorKey(const GrGLSLCaps& caps, | |
| GrProcessorKeyBuilder* b) const { | |
| GrGLAlphaThresholdEffect::GenKey(*this, caps, b); | |
| } | |
| GrGLFragmentProcessor* AlphaThresholdEffect::createGLInstance() const { | |
| return SkNEW_ARGS(GrGLAlphaThresholdEffect, (*this)); | |
| } | |
| bool AlphaThresholdEffect::onIsEqual(const GrFragmentProcessor& sBase) const { | |
| const AlphaThresholdEffect& s = sBase.cast<AlphaThresholdEffect>(); | |
| return (this->fInnerThreshold == s.fInnerThreshold && | |
| this->fOuterThreshold == s.fOuterThreshold); | |
| } | |
| void AlphaThresholdEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { | |
| if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) { | |
| inout->mulByUnknownSingleComponent(); | |
| } else if (GrPixelConfigIsOpaque(this->texture(0)->config()) && fOuterThreshold >= 1.f) { | |
| inout->mulByUnknownOpaqueFourComponents(); | |
| } else { | |
| inout->mulByUnknownFourComponents(); | |
| } | |
| } | |
| #endif | |
| SkFlattenable* SkAlphaThresholdFilterImpl::CreateProc(SkReadBuffer& buffer) { | |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); | |
| SkScalar inner = buffer.readScalar(); | |
| SkScalar outer = buffer.readScalar(); | |
| SkRegion rgn; | |
| buffer.readRegion(&rgn); | |
| return SkAlphaThresholdFilter::Create(rgn, inner, outer, common.getInput(0)); | |
| } | |
| SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(const SkRegion& region, | |
| SkScalar innerThreshold, | |
| SkScalar outerThreshold, | |
| SkImageFilter* input) | |
| : INHERITED(1, &input) | |
| , fRegion(region) | |
| , fInnerThreshold(innerThreshold) | |
| , fOuterThreshold(outerThreshold) { | |
| } | |
| #if SK_SUPPORT_GPU | |
| bool SkAlphaThresholdFilterImpl::asFragmentProcessor(GrFragmentProcessor** fp, | |
| GrTexture* texture, | |
| const SkMatrix& in_matrix, | |
| const SkIRect&) const { | |
| if (fp) { | |
| GrContext* context = texture->getContext(); | |
| GrSurfaceDesc maskDesc; | |
| if (context->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { | |
| maskDesc.fConfig = kAlpha_8_GrPixelConfig; | |
| } else { | |
| maskDesc.fConfig = kRGBA_8888_GrPixelConfig; | |
| } | |
| maskDesc.fFlags = kRenderTarget_GrSurfaceFlag; | |
| // Add one pixel of border to ensure that clamp mode will be all zeros | |
| // the outside. | |
| maskDesc.fWidth = texture->width(); | |
| maskDesc.fHeight = texture->height(); | |
| SkAutoTUnref<GrTexture> maskTexture(context->textureProvider()->refScratchTexture( | |
| maskDesc, GrTextureProvider::kApprox_ScratchTexMatch)); | |
| if (!maskTexture) { | |
| return false; | |
| } | |
| GrDrawContext* drawContext = context->drawContext(); | |
| if (drawContext) { | |
| GrPaint grPaint; | |
| grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode); | |
| SkRegion::Iterator iter(fRegion); | |
| drawContext->clear(maskTexture->asRenderTarget(), NULL, 0x0, true); | |
| while (!iter.done()) { | |
| SkRect rect = SkRect::Make(iter.rect()); | |
| drawContext->drawRect(maskTexture->asRenderTarget(), GrClip::WideOpen(), grPaint, | |
| in_matrix, rect); | |
| iter.next(); | |
| } | |
| } | |
| *fp = AlphaThresholdEffect::Create(texture, | |
| maskTexture, | |
| fInnerThreshold, | |
| fOuterThreshold); | |
| } | |
| return true; | |
| } | |
| #endif | |
| void SkAlphaThresholdFilterImpl::flatten(SkWriteBuffer& buffer) const { | |
| this->INHERITED::flatten(buffer); | |
| buffer.writeScalar(fInnerThreshold); | |
| buffer.writeScalar(fOuterThreshold); | |
| buffer.writeRegion(fRegion); | |
| } | |
| bool SkAlphaThresholdFilterImpl::onFilterImage(Proxy*, const SkBitmap& src, | |
| const Context& ctx, SkBitmap* dst, | |
| SkIPoint* offset) const { | |
| SkASSERT(src.colorType() == kN32_SkColorType); | |
| if (src.colorType() != kN32_SkColorType) { | |
| return false; | |
| } | |
| SkMatrix localInverse; | |
| if (!ctx.ctm().invert(&localInverse)) { | |
| return false; | |
| } | |
| SkAutoLockPixels alp(src); | |
| SkASSERT(src.getPixels()); | |
| if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { | |
| return false; | |
| } | |
| if (!dst->tryAllocPixels(src.info())) { | |
| return false; | |
| } | |
| U8CPU innerThreshold = (U8CPU)(fInnerThreshold * 0xFF); | |
| U8CPU outerThreshold = (U8CPU)(fOuterThreshold * 0xFF); | |
| SkColor* sptr = src.getAddr32(0, 0); | |
| SkColor* dptr = dst->getAddr32(0, 0); | |
| int width = src.width(), height = src.height(); | |
| for (int y = 0; y < height; ++y) { | |
| for (int x = 0; x < width; ++x) { | |
| const SkColor& source = sptr[y * width + x]; | |
| SkColor output_color(source); | |
| SkPoint position; | |
| localInverse.mapXY((SkScalar)x, (SkScalar)y, &position); | |
| if (fRegion.contains((int32_t)position.x(), (int32_t)position.y())) { | |
| if (SkColorGetA(source) < innerThreshold) { | |
| U8CPU alpha = SkColorGetA(source); | |
| if (alpha == 0) | |
| alpha = 1; | |
| float scale = (float)innerThreshold / alpha; | |
| output_color = SkColorSetARGB(innerThreshold, | |
| (U8CPU)(SkColorGetR(source) * scale), | |
| (U8CPU)(SkColorGetG(source) * scale), | |
| (U8CPU)(SkColorGetB(source) * scale)); | |
| } | |
| } else { | |
| if (SkColorGetA(source) > outerThreshold) { | |
| float scale = (float)outerThreshold / SkColorGetA(source); | |
| output_color = SkColorSetARGB(outerThreshold, | |
| (U8CPU)(SkColorGetR(source) * scale), | |
| (U8CPU)(SkColorGetG(source) * scale), | |
| (U8CPU)(SkColorGetB(source) * scale)); | |
| } | |
| } | |
| dptr[y * dst->width() + x] = output_color; | |
| } | |
| } | |
| return true; | |
| } | |
| #ifndef SK_IGNORE_TO_STRING | |
| void SkAlphaThresholdFilterImpl::toString(SkString* str) const { | |
| str->appendf("SkAlphaThresholdImageFilter: ("); | |
| str->appendf("inner: %f outer: %f", fInnerThreshold, fOuterThreshold); | |
| str->append(")"); | |
| } | |
| #endif | |