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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 "SkColorFilter.h"
#include "SkReadBuffer.h"
#include "SkString.h"
#include "SkWriteBuffer.h"
bool SkColorFilter::asColorMode(SkColor* color, SkXfermode::Mode* mode) const {
return false;
}
bool SkColorFilter::asColorMatrix(SkScalar matrix[20]) const {
return false;
}
bool SkColorFilter::asComponentTable(SkBitmap*) const {
return false;
}
SkColor SkColorFilter::filterColor(SkColor c) const {
SkPMColor dst, src = SkPreMultiplyColor(c);
this->filterSpan(&src, 1, &dst);
return SkUnPreMultiply::PMColorToColor(dst);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
/*
* 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 SK_OVERRIDE {
// Can only claim alphaunchanged and 16bit support if both our proxys do.
return fOuter->getFlags() & fInner->getFlags();
}
void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const SK_OVERRIDE {
fInner->filterSpan(shader, count, result);
fOuter->filterSpan(result, count, result);
}
#ifndef SK_IGNORE_TO_STRING
void toString(SkString* str) const SK_OVERRIDE {
SkString outerS, innerS;
fOuter->toString(&outerS);
fInner->toString(&innerS);
str->appendf("SkComposeColorFilter: outer(%s) inner(%s)", outerS.c_str(), innerS.c_str());
}
#endif
#if SK_SUPPORT_GPU
bool asFragmentProcessors(GrContext* context,
SkTDArray<GrFragmentProcessor*>* array) const SK_OVERRIDE {
bool hasFrags = fInner->asFragmentProcessors(context, array);
hasFrags |= fOuter->asFragmentProcessors(context, array);
return hasFrags;
}
#endif
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeColorFilter)
protected:
void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
buffer.writeFlattenable(fOuter);
buffer.writeFlattenable(fInner);
}
private:
SkComposeColorFilter(SkColorFilter* outer, SkColorFilter* inner, int composedFilterCount)
: fOuter(SkRef(outer))
, fInner(SkRef(inner))
, fComposedFilterCount(composedFilterCount)
{
SkASSERT(composedFilterCount >= 2);
SkASSERT(composedFilterCount <= SK_MAX_COMPOSE_COLORFILTER_COUNT);
}
int privateComposedFilterCount() const SK_OVERRIDE {
return fComposedFilterCount;
}
SkAutoTUnref<SkColorFilter> fOuter;
SkAutoTUnref<SkColorFilter> fInner;
const int fComposedFilterCount;
friend class SkColorFilter;
typedef SkColorFilter INHERITED;
};
SkFlattenable* SkComposeColorFilter::CreateProc(SkReadBuffer& buffer) {
SkAutoTUnref<SkColorFilter> outer(buffer.readColorFilter());
SkAutoTUnref<SkColorFilter> inner(buffer.readColorFilter());
return CreateComposeFilter(outer, inner);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
SkColorFilter* SkColorFilter::CreateComposeFilter(SkColorFilter* outer, SkColorFilter* inner) {
if (!outer) {
return SkSafeRef(inner);
}
if (!inner) {
return SkSafeRef(outer);
}
// Give the subclass a shot at a more optimal composition...
SkColorFilter* composition = outer->newComposed(inner);
if (composition) {
return composition;
}
int count = inner->privateComposedFilterCount() + outer->privateComposedFilterCount();
if (count > SK_MAX_COMPOSE_COLORFILTER_COUNT) {
return NULL;
}
return SkNEW_ARGS(SkComposeColorFilter, (outer, inner, count));
}
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkColorFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeColorFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
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