| /* |
| * 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" |
| |
| 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 SK_OVERRIDE; |
| |
| virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&, |
| SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE; |
| #if SK_SUPPORT_GPU |
| virtual bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&, |
| const SkIRect& bounds) const SK_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 SK_OVERRIDE { return "Alpha Threshold"; } |
| |
| float innerThreshold() const { return fInnerThreshold; } |
| float outerThreshold() const { return fOuterThreshold; } |
| |
| void getGLProcessorKey(const GrGLCaps&, GrProcessorKeyBuilder*) const SK_OVERRIDE; |
| |
| GrGLFragmentProcessor* createGLInstance() const SK_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 SK_OVERRIDE; |
| |
| void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_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&) SK_OVERRIDE; |
| |
| void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_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"); |
| |
| GrGLFPFragmentBuilder* 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 GrDrawTargetCaps&, |
| 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 GrGLCaps& 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->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { |
| maskDesc.fConfig = kAlpha_8_GrPixelConfig; |
| } else { |
| maskDesc.fConfig = kRGBA_8888_GrPixelConfig; |
| } |
| maskDesc.fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_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->refScratchTexture(maskDesc, GrContext::kApprox_ScratchTexMatch)); |
| if (!maskTexture) { |
| return false; |
| } |
| |
| { |
| GrContext::AutoRenderTarget art(context, maskTexture->asRenderTarget()); |
| GrPaint grPaint; |
| grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode); |
| SkRegion::Iterator iter(fRegion); |
| context->clear(NULL, 0x0, true, maskTexture->asRenderTarget()); |
| |
| while (!iter.done()) { |
| SkRect rect = SkRect::Make(iter.rect()); |
| context->drawRect(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 |
| |
