【surfaceflinger源码分析】RenderSurface与FramebufferSurface之间的关系

最新推荐文章于 2023-03-19 22:26:54 发布

原创

最新推荐文章于 2023-03-19 22:26:54 发布 · 1.4k 阅读

6 ·

CC 4.0 BY-SA版权

文章标签：

#surfaceflinger #合成 #RenderSurface #composeSurfaces

文章详细介绍了Android系统中SurfaceFlinger如何创建和管理FramebufferSurface与RenderSurface。通过BufferQueue，RenderSurface作为生产者获取合成的图形数据，而FramebufferSurface作为消费者负责消费这些数据，将图像送至屏幕显示。整个过程涉及EGL操作和硬件Composer(HWC)的协同工作。

刚刚想全面梳理下surfaceflinger中一个GraphicBuffer的完整旅程，发现流程实在是太长，而且涉及到EGL相关的操作比较复杂，不得不暂停前一篇博客，先启动梳理下RenderSurface与FramebufferSurface的关系以及其作用。

RenderSurface与FramebufferSurface的创建

创建FramebufferSurface

void SurfaceFlinger::processDisplayAdded(const wp<IBinder>& displayToken,
                                         const DisplayDeviceState& state) {
   
   
    .............................................;
    compositionengine::DisplayCreationArgsBuilder builder;
    if (const auto& physical = state.physical) {
   
   
        builder.setPhysical({
   
   physical->id, physical->type});
    }
    builder.setPixels(ui::Size(width, height));
    builder.setPixelFormat(pixelFormat);
    builder.setIsSecure(state.isSecure);
    builder.setLayerStackId(state.layerStack);
    builder.setPowerAdvisor(&mPowerAdvisor);
    builder.setUseHwcVirtualDisplays(mUseHwcVirtualDisplays || getHwComposer().isUsingVrComposer());
    builder.setName(state.displayName);
    //创建Display这个类， surfaceflinger\CompositionEngine\src\Display.cpp
    const auto compositionDisplay = getCompositionEngine().createDisplay(builder.build());

    sp<compositionengine::DisplaySurface> displaySurface;
    sp<IGraphicBufferProducer> producer;
    sp<IGraphicBufferProducer> bqProducer;
    sp<IGraphicBufferConsumer> bqConsumer;
    //创建一个bufferQueue,获取到bufferqueue的bqProducer和bqConsumer
    getFactory().createBufferQueue(&bqProducer, &bqConsumer, /*consumerIsSurfaceFlinger =*/false);

    std::optional<DisplayId> displayId = compositionDisplay->getId();
    if (state.isVirtual()) {
   
   
       ................'
    } else {
   
   
        ...

最低0.47元/天解锁文章