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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 "include/core/SkCanvas.h"
- #include "include/core/SkString.h"
- #include "include/effects/SkShaderMaskFilter.h"
- #include "src/core/SkMaskFilterBase.h"
- #include "src/core/SkReadBuffer.h"
- #include "src/shaders/SkShaderBase.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; }
- protected:
- #if SK_SUPPORT_GPU
- std::unique_ptr<GrFragmentProcessor> onAsFragmentProcessor(const GrFPArgs&) const override;
- bool onHasFragmentProcessor() const override;
- #endif
- private:
- SK_FLATTENABLE_HOOKS(SkShaderMF)
- 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 "src/gpu/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;
- }
- void SkShaderMaskFilter::RegisterFlattenables() { SK_REGISTER_FLATTENABLE(SkShaderMF); }
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