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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkMaskFilterBase.h"
#include "SkReadBuffer.h"
#include "SkShaderMaskFilter.h"
#include "SkShaderBase.h"
#include "SkString.h"
class SkShaderMF : public SkMaskFilterBase {
public:
SkShaderMF(sk_sp<SkShader> shader) : fShader(std::move(shader)) {}
SkMask::Format getFormat() const override { return SkMask::kA8_Format; }
bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix&,
SkIPoint* margin) const override;
void computeFastBounds(const SkRect& src, SkRect* dst) const override {
*dst = src;
}
bool asABlur(BlurRec*) const override { return false; }
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkShaderMF)
protected:
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> onAsFragmentProcessor(const GrFPArgs&) const override;
bool onHasFragmentProcessor() const override;
#endif
private:
sk_sp<SkShader> fShader;
SkShaderMF(SkReadBuffer&);
void flatten(SkWriteBuffer&) const override;
friend class SkShaderMaskFilter;
typedef SkMaskFilter INHERITED;
};
sk_sp<SkFlattenable> SkShaderMF::CreateProc(SkReadBuffer& buffer) {
return SkShaderMaskFilter::Make(buffer.readShader());
}
void SkShaderMF::flatten(SkWriteBuffer& buffer) const {
buffer.writeFlattenable(fShader.get());
}
static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB,
size_t copyBytes, int rows) {
for (int i = 0; i < rows; ++i) {
memcpy(dst, src, copyBytes);
dst = (char*)dst + dstRB;
src = (const char*)src + srcRB;
}
}
bool SkShaderMF::filterMask(SkMask* dst, const SkMask& src, const SkMatrix& ctm,
SkIPoint* margin) const {
if (src.fFormat != SkMask::kA8_Format) {
return false;
}
if (margin) {
margin->set(0, 0);
}
dst->fBounds = src.fBounds;
dst->fRowBytes = src.fBounds.width(); // need alignment?
dst->fFormat = SkMask::kA8_Format;
if (src.fImage == nullptr) {
dst->fImage = nullptr;
return true;
}
size_t size = dst->computeImageSize();
if (0 == size) {
return false; // too big to allocate, abort
}
// Allocate and initialize dst image with a copy of the src image
dst->fImage = SkMask::AllocImage(size);
rect_memcpy(dst->fImage, dst->fRowBytes, src.fImage, src.fRowBytes,
src.fBounds.width() * sizeof(uint8_t), src.fBounds.height());
// Now we have a dst-mask, just need to setup a canvas and draw into it
SkBitmap bitmap;
if (!bitmap.installMaskPixels(*dst)) {
return false;
}
SkPaint paint;
paint.setShader(fShader);
paint.setFilterQuality(SkFilterQuality::kLow_SkFilterQuality);
// this blendmode is the trick: we only draw the shader where the mask is
paint.setBlendMode(SkBlendMode::kSrcIn);
SkCanvas canvas(bitmap);
canvas.translate(-SkIntToScalar(dst->fBounds.fLeft), -SkIntToScalar(dst->fBounds.fTop));
canvas.concat(ctm);
canvas.drawPaint(paint);
return true;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "GrFragmentProcessor.h"
std::unique_ptr<GrFragmentProcessor> SkShaderMF::onAsFragmentProcessor(const GrFPArgs& args) const {
return GrFragmentProcessor::MulInputByChildAlpha(as_SB(fShader)->asFragmentProcessor(args));
}
bool SkShaderMF::onHasFragmentProcessor() const {
return true;
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
sk_sp<SkMaskFilter> SkShaderMaskFilter::Make(sk_sp<SkShader> shader) {
return shader ? sk_sp<SkMaskFilter>(new SkShaderMF(std::move(shader))) : nullptr;
}
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShaderMaskFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkShaderMF)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
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