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 GrBlendFragmentProcessor_DEFINED |
9 | #define GrBlendFragmentProcessor_DEFINED |
10 | |
11 | #include "include/core/SkBlendMode.h" |
12 | #include "include/core/SkRefCnt.h" |
13 | |
14 | class GrFragmentProcessor; |
15 | |
16 | namespace GrBlendFragmentProcessor { |
17 | |
18 | // TODO(skbug.com/10457): Standardize on a single blend behavior |
19 | enum class BlendBehavior { |
20 | // Picks "ComposeOne" or "ComposeTwo" automatically depending on presence of src/dst FPs. |
21 | kDefault = 0, |
22 | |
23 | // half(1) is passed as the input color to child FPs. No alpha channel trickery. |
24 | kComposeOneBehavior, |
25 | |
26 | // sk_InColor.rgb1 is passed as the input color to child FPs. Alpha is manually blended. |
27 | kComposeTwoBehavior, |
28 | |
29 | // half(1) is passed to src; sk_InColor.rgba is passed to dst. No alpha channel trickery. |
30 | kSkModeBehavior, |
31 | |
32 | kLastBlendBehavior = kSkModeBehavior, |
33 | }; |
34 | |
35 | /** Blends src and dst inputs according to the blend mode. |
36 | * If either input is null, the input color (sk_InColor) is used instead. |
37 | */ |
38 | std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> src, |
39 | std::unique_ptr<GrFragmentProcessor> dst, |
40 | SkBlendMode mode, |
41 | BlendBehavior behavior = BlendBehavior::kDefault); |
42 | |
43 | } // namespace GrBlendFragmentProcessor |
44 | |
45 | #endif |
46 | |