| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkArenaAlloc.h" |
| #include "SkColorFilter.h" |
| #include "SkColorSpaceXformer.h" |
| #include "SkNx.h" |
| #include "SkPM4f.h" |
| #include "SkRasterPipeline.h" |
| #include "SkReadBuffer.h" |
| #include "SkRefCnt.h" |
| #include "SkString.h" |
| #include "SkTDArray.h" |
| #include "SkUnPreMultiply.h" |
| #include "SkWriteBuffer.h" |
| #include "../jumper/SkJumper.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "GrFragmentProcessor.h" |
| #endif |
| |
| bool SkColorFilter::asColorMode(SkColor*, SkBlendMode*) const { |
| return false; |
| } |
| |
| bool SkColorFilter::asColorMatrix(SkScalar matrix[20]) const { |
| return false; |
| } |
| |
| bool SkColorFilter::asComponentTable(SkBitmap*) const { |
| return false; |
| } |
| |
| #if SK_SUPPORT_GPU |
| std::unique_ptr<GrFragmentProcessor> SkColorFilter::asFragmentProcessor( |
| GrContext*, const GrColorSpaceInfo&) const { |
| return nullptr; |
| } |
| #endif |
| |
| void SkColorFilter::appendStages(SkRasterPipeline* p, |
| SkColorSpace* dstCS, |
| SkArenaAlloc* alloc, |
| bool shaderIsOpaque) const { |
| this->onAppendStages(p, dstCS, alloc, shaderIsOpaque); |
| } |
| |
| SkColor SkColorFilter::filterColor(SkColor c) const { |
| const float inv255 = 1.0f / 255; |
| SkColor4f c4 = this->filterColor4f({ |
| SkColorGetR(c) * inv255, |
| SkColorGetG(c) * inv255, |
| SkColorGetB(c) * inv255, |
| SkColorGetA(c) * inv255, |
| }, nullptr); |
| return SkColorSetARGB(sk_float_round2int(c4.fA*255), |
| sk_float_round2int(c4.fR*255), |
| sk_float_round2int(c4.fG*255), |
| sk_float_round2int(c4.fB*255)); |
| } |
| |
| #include "SkRasterPipeline.h" |
| SkColor4f SkColorFilter::filterColor4f(const SkColor4f& c, SkColorSpace* colorSpace) const { |
| SkPMColor4f dst, src = c.premul(); |
| |
| SkSTArenaAlloc<128> alloc; |
| SkRasterPipeline pipeline(&alloc); |
| |
| pipeline.append_constant_color(&alloc, src.vec()); |
| this->onAppendStages(&pipeline, colorSpace, &alloc, c.fA == 1); |
| SkJumper_MemoryCtx dstPtr = { &dst, 0 }; |
| pipeline.append(SkRasterPipeline::store_f32, &dstPtr); |
| pipeline.run(0,0, 1,1); |
| |
| return dst.unpremul(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| /* |
| * Since colorfilters may be used on the GPU backend, and in that case we may string together |
| * many GrFragmentProcessors, we might exceed some internal instruction/resource limit. |
| * |
| * Since we don't yet know *what* those limits might be when we construct the final shader, |
| * we just set an arbitrary limit during construction. If later we find smarter ways to know what |
| * the limnits are, we can change this constant (or remove it). |
| */ |
| #define SK_MAX_COMPOSE_COLORFILTER_COUNT 4 |
| |
| class SkComposeColorFilter : public SkColorFilter { |
| public: |
| uint32_t getFlags() const override { |
| // Can only claim alphaunchanged support if both our proxys do. |
| return fOuter->getFlags() & fInner->getFlags(); |
| } |
| |
| void onAppendStages(SkRasterPipeline* p, SkColorSpace* dst, SkArenaAlloc* scratch, |
| bool shaderIsOpaque) const override { |
| bool innerIsOpaque = shaderIsOpaque; |
| if (!(fInner->getFlags() & kAlphaUnchanged_Flag)) { |
| innerIsOpaque = false; |
| } |
| fInner->appendStages(p, dst, scratch, shaderIsOpaque); |
| fOuter->appendStages(p, dst, scratch, innerIsOpaque); |
| } |
| |
| #if SK_SUPPORT_GPU |
| std::unique_ptr<GrFragmentProcessor> asFragmentProcessor( |
| GrContext* context, const GrColorSpaceInfo& dstColorSpaceInfo) const override { |
| auto innerFP = fInner->asFragmentProcessor(context, dstColorSpaceInfo); |
| auto outerFP = fOuter->asFragmentProcessor(context, dstColorSpaceInfo); |
| if (!innerFP || !outerFP) { |
| return nullptr; |
| } |
| std::unique_ptr<GrFragmentProcessor> series[] = { std::move(innerFP), std::move(outerFP) }; |
| return GrFragmentProcessor::RunInSeries(series, 2); |
| } |
| #endif |
| |
| protected: |
| void flatten(SkWriteBuffer& buffer) const override { |
| buffer.writeFlattenable(fOuter.get()); |
| buffer.writeFlattenable(fInner.get()); |
| } |
| |
| private: |
| SK_FLATTENABLE_HOOKS(SkComposeColorFilter) |
| |
| SkComposeColorFilter(sk_sp<SkColorFilter> outer, sk_sp<SkColorFilter> inner, |
| int composedFilterCount) |
| : fOuter(std::move(outer)) |
| , fInner(std::move(inner)) |
| , fComposedFilterCount(composedFilterCount) |
| { |
| SkASSERT(composedFilterCount >= 2); |
| SkASSERT(composedFilterCount <= SK_MAX_COMPOSE_COLORFILTER_COUNT); |
| } |
| |
| int privateComposedFilterCount() const override { |
| return fComposedFilterCount; |
| } |
| |
| sk_sp<SkColorFilter> onMakeColorSpace(SkColorSpaceXformer* xformer) const override { |
| auto outer = xformer->apply(fOuter.get()); |
| auto inner = xformer->apply(fInner.get()); |
| if (outer != fOuter || inner != fInner) { |
| return outer->makeComposed(inner); |
| } |
| return this->INHERITED::onMakeColorSpace(xformer); |
| } |
| |
| sk_sp<SkColorFilter> fOuter; |
| sk_sp<SkColorFilter> fInner; |
| const int fComposedFilterCount; |
| |
| friend class SkColorFilter; |
| |
| typedef SkColorFilter INHERITED; |
| }; |
| |
| sk_sp<SkFlattenable> SkComposeColorFilter::CreateProc(SkReadBuffer& buffer) { |
| sk_sp<SkColorFilter> outer(buffer.readColorFilter()); |
| sk_sp<SkColorFilter> inner(buffer.readColorFilter()); |
| return outer ? outer->makeComposed(std::move(inner)) : inner; |
| } |
| |
| |
| sk_sp<SkColorFilter> SkColorFilter::makeComposed(sk_sp<SkColorFilter> inner) const { |
| if (!inner) { |
| return sk_ref_sp(this); |
| } |
| |
| // Give the subclass a shot at a more optimal composition... |
| auto composition = this->onMakeComposed(inner); |
| if (composition) { |
| return composition; |
| } |
| |
| int count = inner->privateComposedFilterCount() + this->privateComposedFilterCount(); |
| if (count > SK_MAX_COMPOSE_COLORFILTER_COUNT) { |
| return nullptr; |
| } |
| return sk_sp<SkColorFilter>(new SkComposeColorFilter(sk_ref_sp(this), std::move(inner), count)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| #include "../gpu/effects/GrSRGBEffect.h" |
| #endif |
| |
| class SkSRGBGammaColorFilter : public SkColorFilter { |
| public: |
| enum class Direction { |
| kLinearToSRGB, |
| kSRGBToLinear, |
| }; |
| SkSRGBGammaColorFilter(Direction dir) : fDir(dir) {} |
| |
| #if SK_SUPPORT_GPU |
| std::unique_ptr<GrFragmentProcessor> asFragmentProcessor( |
| GrContext*, const GrColorSpaceInfo&) const override { |
| // wish our caller would let us know if our input was opaque... |
| GrSRGBEffect::Alpha alpha = GrSRGBEffect::Alpha::kPremul; |
| switch (fDir) { |
| case Direction::kLinearToSRGB: |
| return GrSRGBEffect::Make(GrSRGBEffect::Mode::kLinearToSRGB, alpha); |
| case Direction::kSRGBToLinear: |
| return GrSRGBEffect::Make(GrSRGBEffect::Mode::kSRGBToLinear, alpha); |
| } |
| return nullptr; |
| } |
| #endif |
| |
| void onAppendStages(SkRasterPipeline* p, SkColorSpace*, SkArenaAlloc* alloc, |
| bool shaderIsOpaque) const override { |
| if (!shaderIsOpaque) { |
| p->append(SkRasterPipeline::unpremul); |
| } |
| switch (fDir) { |
| case Direction::kLinearToSRGB: |
| p->append(SkRasterPipeline::to_srgb); |
| break; |
| case Direction::kSRGBToLinear: |
| p->append(SkRasterPipeline::from_srgb); |
| break; |
| } |
| if (!shaderIsOpaque) { |
| p->append(SkRasterPipeline::premul); |
| } |
| } |
| |
| protected: |
| void flatten(SkWriteBuffer& buffer) const override { |
| buffer.write32(static_cast<uint32_t>(fDir)); |
| } |
| |
| private: |
| SK_FLATTENABLE_HOOKS(SkSRGBGammaColorFilter) |
| |
| const Direction fDir; |
| |
| friend class SkColorFilter; |
| typedef SkColorFilter INHERITED; |
| }; |
| |
| sk_sp<SkFlattenable> SkSRGBGammaColorFilter::CreateProc(SkReadBuffer& buffer) { |
| uint32_t dir = buffer.read32(); |
| if (!buffer.validate(dir <= 1)) { |
| return nullptr; |
| } |
| return sk_sp<SkFlattenable>(new SkSRGBGammaColorFilter(static_cast<Direction>(dir))); |
| } |
| |
| template <SkSRGBGammaColorFilter::Direction dir> |
| sk_sp<SkColorFilter> MakeSRGBGammaCF() { |
| static SkColorFilter* gSingleton = new SkSRGBGammaColorFilter(dir); |
| return sk_ref_sp(gSingleton); |
| } |
| |
| sk_sp<SkColorFilter> SkColorFilter::MakeLinearToSRGBGamma() { |
| return MakeSRGBGammaCF<SkSRGBGammaColorFilter::Direction::kLinearToSRGB>(); |
| } |
| |
| sk_sp<SkColorFilter> SkColorFilter::MakeSRGBToLinearGamma() { |
| return MakeSRGBGammaCF<SkSRGBGammaColorFilter::Direction::kSRGBToLinear>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkModeColorFilter.h" |
| |
| void SkColorFilter::InitializeFlattenables() { |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkModeColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSRGBGammaColorFilter) |
| } |