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      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     void syncEnabled();
     38 
     39     static void getFactors(SkXfermode::Mode mode, ModeOrderSwap modeUsage,
     40             GLenum* outSrc, GLenum* outDst);
     41     void setFactors(GLenum src, GLenum dst);
     42 
     43     void dump();
     44 private:
     45     Blend();
     46     void invalidate();
     47     bool mEnabled;
     48     GLenum mSrcMode;
     49     GLenum mDstMode;
     50 };
     51 
     52 } /* namespace uirenderer */
     53 } /* namespace android */
     54 
     55 #endif // RENDERSTATE_BLEND_H
     56