mmm frameworks/native/services/surfaceflinger/tests/resize/遇到几个错误，这里面讲一下解决过程，有一部分参考网络。感谢。
1、问题：
frameworks/native/services/surfaceflinger/tests/resize/resize.cpp:50:26: error: aggregate 'ANativeWindow_Buffer outBuffer' has incomplete type and cannot be defined
解决：
在resize.cpp中，添加#include <android/native_window.h>
2、问题：
frameworks/native/services/surfaceflinger/tests/resize/resize.cpp:58:29: error: no matching function for call to 'android::Surface::lock(ANativeWindow_Buffer*)'
解决：
surface->lock(&outBuffer); ---》surface->lock(&outBuffer, NULL);
3、问题：
frameworks/native/services/surfaceflinger/tests/resize/resize.cpp:70:1: error: expected '}' at end of input 。。。
解决：
最后加一个“｝”
4、问题：
out/target/product/msm8909/obj/lib/crtbegin_dynamic.o:crtbegin.c:function _start: error: undefined reference to 'main'
collect2: error: ld returned 1 exit status
解决：
屏蔽//namespace android {
//｝
5、问题：
error: undefined reference to 'android::ProcessState::self()'
解决：
android.mk中加入：
LOCAL_SHARED_LIBRARIES := \
libcutils \
libutils \
libui \
libgui \
libbinder
最终编译通过了！真够费劲的。
附上 修改后的代码：
/** Copyright (C) 2010 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.*/#include <cutils/memory.h>#include <utils/Log.h>#include <android/native_window.h>#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>using namespace android;//namespace android {int main(int argc, char** argv)
{// set up the thread-poolsp<ProcessState> proc(ProcessState::self());ProcessState::self()->startThreadPool();// create a client to surfaceflingersp<SurfaceComposerClient> client = new SurfaceComposerClient();sp<SurfaceControl> surfaceControl = client->createSurface(String8("resize"),320, 240, PIXEL_FORMAT_RGB_565, 0);sp<Surface> surface = surfaceControl->getSurface();SurfaceComposerClient::openGlobalTransaction();surfaceControl->setLayer(100000);SurfaceComposerClient::closeGlobalTransaction();ANativeWindow_Buffer outBuffer;surface->lock(&outBuffer, NULL);ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);surface->unlockAndPost();
/*surface->lock(&outBuffer, NULL);android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);surface->unlockAndPost();
*/SurfaceComposerClient::openGlobalTransaction();surfaceControl->setSize(320, 240);SurfaceComposerClient::closeGlobalTransaction();IPCThreadState::self()->joinThreadPool();return 0;
}
//}
附解释版本，对于理解surfaceflinger很有帮助，一行一行敲的，纯属原创：
/** Copyright (C) 2010 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.*/#include <cutils/memory.h>#include <utils/Log.h>#include <android/native_window.h>#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>using namespace android;//namespace android {int main(int argc, char** argv)
{// set up the thread-pool need for binder,建立binder通讯接口，SurfaceComposerClient 和 surfaceflinger之间的通信sp<ProcessState> proc(ProcessState::self());ProcessState::self()->startThreadPool();// create a client to surfaceflingersp<SurfaceComposerClient> client = new SurfaceComposerClient();//通过SurfaceComposerClient获取一个大小为300(w)x400(h)的surface画布，这块画布数据格式为PIXEL_FORMAT_RGB_565，//每个像素字节数为(bytesPerPixel(outBuffer.format))=2sp<SurfaceControl> surfaceControl = client->createSurface(String8("resize"),300, 400, PIXEL_FORMAT_RGB_565, 0);
//surfaceControl是控制每个surface的属性，包含大小，z-order,位置,透明度等sp<Surface> surface = surfaceControl->getSurface();//在设置每个layer的属性的时候需要打开一个事务，告诉surfaceflinger监控程序，layer状态的改变，需要进行对相关layer进行重绘SurfaceComposerClient::openGlobalTransaction();//设置layer（surface）的相关属性surfaceControl->setLayer(100000);surfaceControl->setPosition(100,100);surfaceControl->setSize(100, 100);//关闭事务，代表设置完毕，这样surfaceflinger服务端就会按要求重绘，这里还没有发送到显示端，只是一个显示数据上的概念SurfaceComposerClient::closeGlobalTransaction();
//这个数据结构跟简单，包含显示窗口的大小，格式，还有数据/*typedef struct ANativeWindow_Buffer {// The number of pixels that are show horizontally.int32_t width;// The number of pixels that are shown vertically.int32_t height;// The number of *pixels* that a line in the buffer takes in// memory. This may be >= width.int32_t stride;// The format of the buffer. One of WINDOW_FORMAT_*int32_t format;// The actual bits.void* bits;// Do not touch.uint32_t reserved[6];} ANativeWindow_Buffer;*/ANativeWindow_Buffer outBuffer;//所以应用程序先调用 surface->lock锁定layer的swapstate，并获得画图的buffer然后就可以在上面进行画图了，完成以后就会调用surface->unlockAndPost()来通知SurfaceFlinger进行Flip。surface->lock(&outBuffer, NULL);ssize_t bpr = outBuffer.stride * bytesPerPixel(outBuffer.format);//下面的数据打印结果：outBuffer.stride = 128, bytesPerPixel(outBuffer.format)=2,outBuffer.height=100printf("outBuffer.stride = %d, bytesPerPixel(outBuffer.format)=%d,outBuffer.height=%d\n",outBuffer.stride, bytesPerPixel(outBuffer.format),outBuffer.height);//设置显示数据都为0x07E0，rgb565代表绿色。0000 0111 1110 0000android_memset16((uint16_t*)outBuffer.bits, 0x07E0, bpr*outBuffer.height);//调用surface->unlockAndPost()来通知SurfaceFlinger进行Flip(刷新到LCD上)surface->unlockAndPost();IPCThreadState::self()->joinThreadPool();return 0;
}
//}
Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)LOCAL_SRC_FILES:= \resize.cppLOCAL_SHARED_LIBRARIES := \libcutils \libutils \libui \libgui \libbinderLOCAL_MODULE:= test-resizeLOCAL_MODULE_TAGS := testsinclude $(BUILD_EXECUTABLE)