1/*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef GrXfermodeFragmentProcessor_DEFINED
9#define GrXfermodeFragmentProcessor_DEFINED
10
11#include "SkRefCnt.h"
12#include "SkBlendMode.h"
13
14class GrFragmentProcessor;
15
16namespace GrXfermodeFragmentProcessor {
17
18/** The color input to the returned processor is treated as the src and the passed in processor is
19    the dst. */
20std::unique_ptr<GrFragmentProcessor> MakeFromDstProcessor(std::unique_ptr<GrFragmentProcessor> dst,
21                                                          SkBlendMode mode);
22
23/** The color input to the returned processor is treated as the dst and the passed in processor is
24    the src. */
25std::unique_ptr<GrFragmentProcessor> MakeFromSrcProcessor(std::unique_ptr<GrFragmentProcessor> src,
26                                                          SkBlendMode mode);
27
28/** Takes the input color, which is assumed to be unpremultiplied, passes it as an opaque color
29    to both src and dst. The outputs of a src and dst are blended using mode and the original
30    input's alpha is applied to the blended color to produce a premul output. */
31std::unique_ptr<GrFragmentProcessor> MakeFromTwoProcessors(std::unique_ptr<GrFragmentProcessor> src,
32                                                           std::unique_ptr<GrFragmentProcessor> dst,
33                                                           SkBlendMode mode);
34
35};
36
37#endif
38