libs/hwui/OpenGLReadback.h

/*
 * Copyright (C) 2016 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.
 */

#pragma once

#include "Readback.h"

#include <EGL/egl.h>
#include <EGL/eglext.h>

namespace android {
namespace uirenderer {

class Matrix4;
class GlLayer;

class OpenGLReadback : public Readback {
public:
    virtual CopyResult copySurfaceInto(Surface& surface, const Rect& srcRect,
                                       SkBitmap* bitmap) override;
    virtual CopyResult copyGraphicBufferInto(GraphicBuffer* graphicBuffer,
                                             SkBitmap* bitmap) override;

protected:
    explicit OpenGLReadback(renderthread::RenderThread& thread) : Readback(thread) {}
    virtual ~OpenGLReadback() {}

    virtual CopyResult copyImageInto(EGLImageKHR eglImage, const Matrix4& imgTransform,
                                     int imgWidth, int imgHeight, const Rect& srcRect,
                                     SkBitmap* bitmap) = 0;

private:
    CopyResult copyGraphicBufferInto(GraphicBuffer* graphicBuffer, Matrix4& texTransform,
                                     const Rect& srcRect, SkBitmap* bitmap);
};

class OpenGLReadbackImpl : public OpenGLReadback {
public:
    OpenGLReadbackImpl(renderthread::RenderThread& thread) : OpenGLReadback(thread) {}

    /**
     * Copies the layer's contents into the provided bitmap.
     */
    static bool copyLayerInto(renderthread::RenderThread& renderThread, GlLayer& layer,
                              SkBitmap* bitmap);

protected:
    virtual CopyResult copyImageInto(EGLImageKHR eglImage, const Matrix4& imgTransform,
                                     int imgWidth, int imgHeight, const Rect& srcRect,
                                     SkBitmap* bitmap) override;
};

}  // namespace uirenderer
}  // namespace android