编译frameworks\native\services\surfaceflinger\tests\resize
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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-pool sp<ProcessState> proc(ProcessState::self()); ProcessState::self()->startThreadPool(); // create a client to surfaceflinger sp<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 surfaceflinger sp<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))=2 sp<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 0000 android_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)
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