1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 #ifndef RENDERSTATE_BLEND_H
17 #define RENDERSTATE_BLEND_H
18 
19 #include "Vertex.h"
20 
21 #include <GLES2/gl2.h>
22 #include <GLES2/gl2ext.h>
23 #include <SkXfermode.h>
24 #include <memory>
25 
26 namespace android {
27 namespace uirenderer {
28 
29 class Blend {
30     friend class RenderState;
31 public:
32     // dictates whether to swap src/dst
33     enum class ModeOrderSwap {
34         NoSwap,
35         Swap,
36     };
37 
38     void enable(SkXfermode::Mode mode, ModeOrderSwap modeUsage);
39     void disable();
40     void syncEnabled();
41 
42     static void getFactors(SkXfermode::Mode mode, ModeOrderSwap modeUsage,
43             GLenum* outSrc, GLenum* outDst);
44     void setFactors(GLenum src, GLenum dst);
45 
46     void dump();
47 private:
48     Blend();
49     void invalidate();
50     bool mEnabled;
51     GLenum mSrcMode;
52     GLenum mDstMode;
53 };
54 
55 } /* namespace uirenderer */
56 } /* namespace android */
57 
58 #endif // RENDERSTATE_BLEND_H
59