f1b7a1d828
One side effect is that the SkShader's (or implicit shader's) fragment processor is responsible for the transition from an unpremul paint color to a premul color. Review URL: https://codereview.chromium.org/1348583002
35 lines
1.4 KiB
C++
35 lines
1.4 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrXfermodeFragmentProcessor_DEFINED
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#define GrXfermodeFragmentProcessor_DEFINED
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#include "SkXfermode.h"
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class GrFragmentProcessor;
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namespace GrXfermodeFragmentProcessor {
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/** The color input to the returned processor is treated as the src and the passed in processor
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is the dst. */
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const GrFragmentProcessor* CreateFromDstProcessor(const GrFragmentProcessor* dst,
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SkXfermode::Mode mode);
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/** The color input to the returned processor is treated as the dst and the passed in processor
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is the src. */
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const GrFragmentProcessor* CreateFromSrcProcessor(const GrFragmentProcessor* src,
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SkXfermode::Mode mode);
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/** Takes the input color, which is assumed to be unpremultiplied, passes it as an opaque color
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to both src and dst. The outputs of a src and dst are blended using mode and the original
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input's alpha is applied to the blended color to produce a premul output. */
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const GrFragmentProcessor* CreateFromTwoProcessors(const GrFragmentProcessor* src,
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const GrFragmentProcessor* dst,
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SkXfermode::Mode mode);
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};
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#endif
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