| /* |
| * 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 "SkDevice.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) |
| friend void SkAlphaThresholdFilter::InitializeFlattenables(); |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override; |
| |
| bool onFilterImageDeprecated(Proxy*, const SkBitmap& src, const Context&, |
| SkBitmap* result, SkIPoint* offset) const override; |
| #if SK_SUPPORT_GPU |
| bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&, |
| const SkIRect& bounds) const override; |
| #endif |
| |
| private: |
| SkRegion fRegion; |
| SkScalar fInnerThreshold; |
| SkScalar fOuterThreshold; |
| typedef SkImageFilter INHERITED; |
| }; |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkAlphaThresholdFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkAlphaThresholdFilterImpl) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
| |
| static SkScalar pin_0_1(SkScalar x) { |
| return SkMinScalar(SkMaxScalar(x, 0), 1); |
| } |
| |
| SkImageFilter* SkAlphaThresholdFilter::Create(const SkRegion& region, |
| SkScalar innerThreshold, |
| SkScalar outerThreshold, |
| SkImageFilter* input) { |
| innerThreshold = pin_0_1(innerThreshold); |
| outerThreshold = pin_0_1(outerThreshold); |
| if (!SkScalarIsFinite(innerThreshold) || !SkScalarIsFinite(outerThreshold)) { |
| return nullptr; |
| } |
| return new 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 "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| #include "glsl/GrGLSLUniformHandler.h" |
| |
| namespace { |
| |
| SkMatrix make_div_and_translate_matrix(GrTexture* texture, int x, int y) { |
| SkMatrix matrix = GrCoordTransform::MakeDivByTextureWHMatrix(texture); |
| matrix.preTranslate(SkIntToScalar(x), SkIntToScalar(y)); |
| return matrix; |
| } |
| |
| }; |
| |
| class AlphaThresholdEffect : public GrFragmentProcessor { |
| |
| public: |
| static GrFragmentProcessor* Create(GrTexture* texture, |
| GrTexture* maskTexture, |
| float innerThreshold, |
| float outerThreshold, |
| const SkIRect& bounds) { |
| return new AlphaThresholdEffect(texture, maskTexture, innerThreshold, outerThreshold, |
| bounds); |
| } |
| |
| virtual ~AlphaThresholdEffect() {}; |
| |
| const char* name() const override { return "Alpha Threshold"; } |
| |
| float innerThreshold() const { return fInnerThreshold; } |
| float outerThreshold() const { return fOuterThreshold; } |
| |
| private: |
| AlphaThresholdEffect(GrTexture* texture, |
| GrTexture* maskTexture, |
| float innerThreshold, |
| float outerThreshold, |
| const SkIRect& bounds) |
| : fInnerThreshold(innerThreshold) |
| , fOuterThreshold(outerThreshold) |
| , fImageCoordTransform(kLocal_GrCoordSet, |
| GrCoordTransform::MakeDivByTextureWHMatrix(texture), texture, |
| GrTextureParams::kNone_FilterMode) |
| , fImageTextureAccess(texture) |
| , fMaskCoordTransform(kLocal_GrCoordSet, |
| make_div_and_translate_matrix(maskTexture, -bounds.x(), -bounds.y()), |
| maskTexture, |
| GrTextureParams::kNone_FilterMode) |
| , fMaskTextureAccess(maskTexture) { |
| this->initClassID<AlphaThresholdEffect>(); |
| this->addCoordTransform(&fImageCoordTransform); |
| this->addTextureAccess(&fImageTextureAccess); |
| this->addCoordTransform(&fMaskCoordTransform); |
| this->addTextureAccess(&fMaskTextureAccess); |
| } |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; |
| |
| 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 GrGLSLFragmentProcessor { |
| public: |
| void emitCode(EmitArgs&) override; |
| |
| protected: |
| void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; |
| |
| private: |
| GrGLSLProgramDataManager::UniformHandle fInnerThresholdVar; |
| GrGLSLProgramDataManager::UniformHandle fOuterThresholdVar; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| void GrGLAlphaThresholdEffect::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"); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0); |
| SkString maskCoords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 1); |
| |
| fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); |
| fragBuilder->codeAppendf("\t\tvec2 mask_coord = %s;\n", maskCoords2D.c_str()); |
| fragBuilder->codeAppend("\t\tvec4 input_color = "); |
| fragBuilder->appendTextureLookup(args.fSamplers[0], "coord"); |
| fragBuilder->codeAppend(";\n"); |
| fragBuilder->codeAppend("\t\tvec4 mask_color = "); |
| fragBuilder->appendTextureLookup(args.fSamplers[1], "mask_coord"); |
| fragBuilder->codeAppend(";\n"); |
| |
| fragBuilder->codeAppendf("\t\tfloat inner_thresh = %s;\n", |
| uniformHandler->getUniformCStr(fInnerThresholdVar)); |
| fragBuilder->codeAppendf("\t\tfloat outer_thresh = %s;\n", |
| uniformHandler->getUniformCStr(fOuterThresholdVar)); |
| fragBuilder->codeAppend("\t\tfloat mask = mask_color.a;\n"); |
| |
| fragBuilder->codeAppend("vec4 color = input_color;\n"); |
| fragBuilder->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"); |
| |
| fragBuilder->codeAppendf("%s = %s;\n", args.fOutputColor, |
| (GrGLSLExpr4(args.fInputColor) * GrGLSLExpr4("color")).c_str()); |
| } |
| |
| void GrGLAlphaThresholdEffect::onSetData(const GrGLSLProgramDataManager& 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); |
| |
| const GrFragmentProcessor* AlphaThresholdEffect::TestCreate(GrProcessorTestData* d) { |
| GrTexture* bmpTex = d->fTextures[GrProcessorUnitTest::kSkiaPMTextureIdx]; |
| GrTexture* maskTex = d->fTextures[GrProcessorUnitTest::kAlphaTextureIdx]; |
| float innerThresh = d->fRandom->nextUScalar1(); |
| float outerThresh = d->fRandom->nextUScalar1(); |
| 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); |
| return AlphaThresholdEffect::Create(bmpTex, maskTex, innerThresh, outerThresh, bounds); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void AlphaThresholdEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLAlphaThresholdEffect::GenKey(*this, caps, b); |
| } |
| |
| GrGLSLFragmentProcessor* AlphaThresholdEffect::onCreateGLSLInstance() const { |
| return new GrGLAlphaThresholdEffect; |
| } |
| |
| 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& inMatrix, |
| const SkIRect& bounds) 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 = bounds.width(); |
| maskDesc.fHeight = bounds.height(); |
| SkAutoTUnref<GrTexture> maskTexture( |
| context->textureProvider()->createApproxTexture(maskDesc)); |
| if (!maskTexture) { |
| return false; |
| } |
| |
| SkAutoTUnref<GrDrawContext> drawContext( |
| context->drawContext(maskTexture->asRenderTarget())); |
| if (drawContext) { |
| GrPaint grPaint; |
| grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode); |
| SkRegion::Iterator iter(fRegion); |
| drawContext->clear(nullptr, 0x0, true); |
| |
| GrClip clip(SkRect::Make(SkIRect::MakeWH(bounds.width(), bounds.height()))); |
| while (!iter.done()) { |
| SkRect rect = SkRect::Make(iter.rect()); |
| drawContext->drawRect(clip, grPaint, inMatrix, rect); |
| iter.next(); |
| } |
| } |
| |
| *fp = AlphaThresholdEffect::Create(texture, |
| maskTexture, |
| fInnerThreshold, |
| fOuterThreshold, |
| bounds); |
| } |
| return true; |
| } |
| #endif |
| |
| void SkAlphaThresholdFilterImpl::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalar(fInnerThreshold); |
| buffer.writeScalar(fOuterThreshold); |
| buffer.writeRegion(fRegion); |
| } |
| |
| bool SkAlphaThresholdFilterImpl::onFilterImageDeprecated(Proxy* proxy, const SkBitmap& src, |
| const Context& ctx, SkBitmap* dst, |
| SkIPoint* offset) const { |
| |
| 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; |
| } |
| |
| SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(src.width(), src.height())); |
| if (!device) { |
| return false; |
| } |
| *dst = device->accessBitmap(false); |
| SkAutoLockPixels alp_dst(*dst); |
| |
| 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 |
| |
