| /* |
| * 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 |
| sk_sp<GrFragmentProcessor> SkColorFilter::asFragmentProcessor(GrContext*, SkColorSpace*) 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 { |
| SkPMColor dst, src = SkPreMultiplyColor(c); |
| this->filterSpan(&src, 1, &dst); |
| return SkUnPreMultiply::PMColorToColor(dst); |
| } |
| |
| #include "SkRasterPipeline.h" |
| SkColor4f SkColorFilter::filterColor4f(const SkColor4f& c) const { |
| SkPM4f dst, src = c.premul(); |
| |
| SkSTArenaAlloc<128> alloc; |
| SkRasterPipeline pipeline(&alloc); |
| |
| pipeline.append(SkRasterPipeline::constant_color, &src); |
| this->onAppendStages(&pipeline, nullptr, &alloc, c.fA == 1); |
| SkPM4f* dstPtr = &dst; |
| pipeline.append(SkRasterPipeline::store_f32, &dstPtr); |
| pipeline.run(0,0, 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 and SkPM4f support if both our proxys do. |
| return fOuter->getFlags() & fInner->getFlags(); |
| } |
| |
| void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const override { |
| fInner->filterSpan(shader, count, result); |
| fOuter->filterSpan(result, count, result); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void toString(SkString* str) const override { |
| SkString outerS, innerS; |
| fOuter->toString(&outerS); |
| fInner->toString(&innerS); |
| // These strings can be long. SkString::appendf has limitations. |
| str->append(SkStringPrintf("SkComposeColorFilter: outer(%s) inner(%s)", outerS.c_str(), |
| innerS.c_str())); |
| } |
| #endif |
| |
| 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 |
| sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext* context, |
| SkColorSpace* dstColorSpace) const override { |
| sk_sp<GrFragmentProcessor> innerFP(fInner->asFragmentProcessor(context, dstColorSpace)); |
| sk_sp<GrFragmentProcessor> outerFP(fOuter->asFragmentProcessor(context, dstColorSpace)); |
| if (!innerFP || !outerFP) { |
| return nullptr; |
| } |
| sk_sp<GrFragmentProcessor> series[] = { std::move(innerFP), std::move(outerFP) }; |
| return GrFragmentProcessor::RunInSeries(series, 2); |
| } |
| #endif |
| |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeColorFilter) |
| |
| protected: |
| void flatten(SkWriteBuffer& buffer) const override { |
| buffer.writeFlattenable(fOuter.get()); |
| buffer.writeFlattenable(fInner.get()); |
| } |
| |
| private: |
| 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 { |
| return SkColorFilter::MakeComposeFilter(xformer->apply(fOuter.get()), |
| xformer->apply(fInner.get())); |
| } |
| |
| 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 MakeComposeFilter(std::move(outer), std::move(inner)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkColorFilter> SkColorFilter::MakeComposeFilter(sk_sp<SkColorFilter> outer, |
| sk_sp<SkColorFilter> inner) { |
| if (!outer) { |
| return inner; |
| } |
| if (!inner) { |
| return outer; |
| } |
| |
| // Give the subclass a shot at a more optimal composition... |
| auto composition = outer->makeComposed(inner); |
| if (composition) { |
| return composition; |
| } |
| |
| int count = inner->privateComposedFilterCount() + outer->privateComposedFilterCount(); |
| if (count > SK_MAX_COMPOSE_COLORFILTER_COUNT) { |
| return nullptr; |
| } |
| return sk_sp<SkColorFilter>(new SkComposeColorFilter(std::move(outer), std::move(inner),count)); |
| } |
| |
| #include "SkModeColorFilter.h" |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkModeColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |