android framework surface native 层渲染

status_t VideoRender::render(const void *data, size_t size,int width,int height)
{
    if(mCodecSurface==NULL){
        return BAD_VALUE ;

    }

  // 本地窗口

    sp<ANativeWindow> mNativeWindow = mSurface;
    int err;
    int mCropWidth = width;
    int mCropHeight = height;
    
    int halFormat = HAL_PIXEL_FORMAT_YCrCb_420_SP;//HAL_PIXEL_FORMAT_YV12;//颜色空间
    int bufWidth = (mCropWidth + 1) & ~1;//按2对齐
    int bufHeight = (mCropHeight + 1) & ~1;
        
    // 参数校验
    CHECK_EQ(0,
            native_window_set_usage(
            mNativeWindow.get(),
            GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN
            | GRALLOC_USAGE_HW_TEXTURE | GRALLOC_USAGE_EXTERNAL_DISP));

    CHECK_EQ(0,
            native_window_set_scaling_mode(
            mNativeWindow.get(),
            NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW));

    // Width must be multiple of 32???
    //很重要,配置宽高和和指定颜色空间yuv420
    //如果这里不配置好，下面deque_buffer只能去申请一个默认宽高的图形缓冲区
    CHECK_EQ(0, native_window_set_buffers_geometry(
                mNativeWindow.get(),
                bufWidth,
                bufHeight,
                halFormat));

    
    ANativeWindowBuffer *buf;//描述buffer
    //申请一块空闲的图形缓冲区
    if ((err = native_window_dequeue_buffer_and_wait(mNativeWindow.get(),
            &buf)) != 0) {
        ALOGW("%d----->Surface::dequeueBuffer returned error %d", mIndex, err);
        return BAD_VALUE;
    }
    
//    sp<GraphicBuffer> graphicBuffer(new GraphicBuffer(buf, false));

    GraphicBufferMapper &mapper = GraphicBufferMapper::get();

    Rect bounds(mCropWidth, mCropHeight);

    void *dst;
    CHECK_EQ(0, mapper.lock(//用来锁定一个图形缓冲区并将缓冲区映射到用户进程
                buf->handle, GRALLOC_USAGE_SW_WRITE_OFTEN, bounds, &dst));//dst就指向图形缓冲区首地址

    if (true){
        size_t dst_y_size = buf->stride * buf->height;
        size_t dst_c_stride = ALIGN(buf->stride / 2, 16);//1行v/u的大小
        size_t dst_c_size = dst_c_stride * buf->height / 2;//u/v的大小
     //   ALOGD(" %d: %d %d!",mIndex,buf->stride,buf->height);
     //   memcpy(dst, data, dst_y_size + dst_c_size*2);//将yuv数据copy到图形缓冲区
         memcpy(dst, data, dst_y_size);//将yuv数据copy到图形缓冲区

        for(size_t i =0;i<dst_c_size; i++) {
            *((char *)dst +dst_y_size +i*2 +1) = *(((char *)data +dst_y_size +i));                
            *((char *)dst +dst_y_size +i*2 ) = *(((char *)data +dst_y_size +dst_c_size +i));
        }
     }

    CHECK_EQ(0, mapper.unlock(buf->handle));

    if ((err = mNativeWindow->queueBuffer(mNativeWindow.get(), buf,
            -1)) != 0) {
        ALOGW("Surface::queueBuffer returned error %d", err);
    }
    buf = NULL;

    return NO_ERROR;
}

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