引言：

通过一个最简单的测试程序直观Android系统的native层Surface的渲染显示过程。

主程序代码：

#include <cutils/memory.h>
#include <utils/Log.h>
#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>
#include <android/native_window.h>using namespace android;//int main(int argc, char** argv)
int main()
{// 设置线程池sp<ProcessState> proc(ProcessState::self());ProcessState::self()->startThreadPool();// 创建与Surfaceflinger通信的客户端sp<SurfaceComposerClient> client = new SurfaceComposerClient();// 创建SurfaceControl并设置名称“resize”、宽高、像素格式，红色分量使用 5 位，绿色分量使用 6 位，蓝色分量使用 5 位。sp<SurfaceControl> surfaceControl = client->createSurface(String8("resize"),400, 600, PIXEL_FORMAT_RGB_565, 0);//通过SurfaceControl获取一个Surfacesp<Surface> surface = surfaceControl->getSurface();SurfaceComposerClient::Transaction t;//设置Layer层级，数值越大层级越高t.setLayer(surfaceControl, 100000).apply();ANativeWindow_Buffer outBuffer;//从BufferQueue中获取获取一个Buffersurface->lock(&outBuffer, NULL);//计算每个像素点的字节大小ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);//使用memset16对buffer赋值（颜色值）android_memset16((uint16_t*)outBuffer.bits, 0xF800, bpr*outBuffer.height);//提交填充后的buffersurface->unlockAndPost();sleep(1);surface->lock(&outBuffer, NULL);android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);surface->unlockAndPost();sleep(1);surface->lock(&outBuffer, NULL);android_memset16((uint16_t*)outBuffer.bits, 0x001F, bpr*outBuffer.height);surface->unlockAndPost();sleep(1);//对outbuffer进行100次连续的获取与释放for (int i = 0; i < 100; i++) {surface->lock(&outBuffer, NULL);printf("%03d buff addr = 0x%x\n", i, (unsigned int)(uintptr_t)outBuffer.bits);surface->unlockAndPost();}IPCThreadState::self()->joinThreadPool();return 0;
}