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/*
* 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(0,1);
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;
}
bool asACompose(SkColorFilter** outer, SkColorFilter** inner) const override {
*outer = fOuter.get();
*inner = fInner.get();
return true;
}
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
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