libs/hwui/renderstate/Blend.h

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef RENDERSTATE_BLEND_H
#define RENDERSTATE_BLEND_H

#include "Vertex.h"

#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <SkXfermode.h>
#include <memory>

namespace android {
namespace uirenderer {

class Blend {
    friend class RenderState;
public:
    // dictates whether to swap src/dst
    enum class ModeOrderSwap {
        NoSwap,
        Swap,
    };

    void enable(SkXfermode::Mode mode, ModeOrderSwap modeUsage);
    void disable();
    void syncEnabled();

    static void getFactors(SkXfermode::Mode mode, ModeOrderSwap modeUsage,
            GLenum* outSrc, GLenum* outDst);
    void setFactors(GLenum src, GLenum dst);

    void dump();
private:
    Blend();
    void invalidate();
    bool mEnabled;
    GLenum mSrcMode;
    GLenum mDstMode;
};

} /* namespace uirenderer */
} /* namespace android */

#endif // RENDERSTATE_BLEND_H