Android(安卓)Surfaceflinger 的使用

最近在做一个android的新平台，涉及到了SurfaceFlinger的使用。又要在另外一个平台上实现一个抓屏的功能，被折磨的囧啊。最近终于能够闲下来整理一下这块的东西了。网上有很多讲解SurfaceFlinger的文章，但大部分都是原理分析，看的头大。下面是一个测试小例子，测试SurfaceFlinger的使用，并结合skia测试了软合成shotsceen的性能。

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/**
* =====================================================================================
* Filename: surface.cpp
* Created: 2012年03月24日 13时39分28秒
* Author: louie (),
* Company: sunniwell.net
* Description: surface test
* =====================================================================================
*/
#define LOG_TAG "SurfaceTest"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <linux/fb.h>
#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IMemory.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/MemoryHeapBase.h>
#include <binder/MemoryBase.h>
#include <binder/Binder.h>
#include <utils/Log.h>
#include <cutils/atomic.h>
#include <cutils/properties.h>
#include <utils/threads.h>
#include <utils/Atomic.h>
#include <utils/String16.h>
#include <android_runtime/AndroidRuntime.h>
#include <android_runtime/ActivityManager.h>
#include <media/AudioTrack.h>
#include <media/RobotWrapper.h>
#include <surfaceflinger/Surface.h>
#include <surfaceflinger/ISurface.h>
#include <surfaceflinger/ISurfaceComposer.h>
#include <surfaceflinger/SurfaceComposerClient.h>
#include <ui/DisplayInfo.h>
#include <SkTypeface.h>
#include <SkTemplates.h>
#include <SkRegion.h>
#include <SkDevice.h>
#include <SkRect.h>
#include <SkCanvas.h>
#include <SkBitmap.h>
#include <SkStream.h>
#include <SkImageDecoder.h>
#include <SkImageEncoder.h>
#include "hi_unf_disp.h"
using namespace android;
bool SkFileDecoder( SkBitmap* bitmap, const char srcPath[], int bits_per_pixel)
{
SkFILEStream stream(srcPath);
if (!stream.isValid()) {
LOGE("ERROR: bad filename <%s>\n", srcPath);
return false;
}
stream.rewind();
SkImageDecoder* codec = SkImageDecoder::Factory(&stream);
if (NULL == codec) {
LOGE("ERROR: no codec found for <%s>\n", srcPath);
return false;
}
SkBitmap::Config config;
switch (bits_per_pixel)
{
case 32:
config = SkBitmap::kARGB_8888_Config;
break;
case 16:
config = SkBitmap::kRGB_565_Config;
break;
default:
LOGE ("Warning: drawRect() not implemented for color depth %i\n",bits_per_pixel);
break;
}
SkAutoTDelete<SkImageDecoder> ad(codec);
stream.rewind();
if (!codec->decode(&stream, bitmap, config,
SkImageDecoder::kDecodePixels_Mode)) {
LOGE("ERROR: codec failed for <%s>\n", srcPath);
return false;
}
return true;
}
int main( )
{
sp<SurfaceComposerClient> surfaceclient;
sp<SurfaceControl> surfaceControl;
sp<Surface> surface;
SkBitmap bitmap;
Surface::SurfaceInfo info;
DisplayInfo display;
//surface 的名字以pid开头
LOGE("[%s %s %d] \n", __FUNCTION__, __FILE__, __LINE__, getpid());
surfaceclient = new SurfaceComposerClient();
surfaceclient->getDisplayInfo(0, &display);
LOGE("display < %d %d>", display.w, display.h);
surfaceControl = surfaceclient->createSurface(getpid(), 0, display.w, display.h, PIXEL_FORMAT_RGBA_8888);
//composer parameters必须在一对open/close transaction之间当close调用时，
//参数被提交给服务端参数值的改变都存放在/frameworks/base/include/private/surfaceflinger/LayerState.h:layer_state_t中，
//当调用closeTransaction时，结构体才会被传送到服务端。这样可以明显简化C/S接口、加快C/S通信速度。
surfaceclient->openTransaction();
surfaceControl->setLayer(1000);
surfaceControl->setSize(display.w, display.h);
surfaceControl->setPosition(1, 1);
surfaceControl->show( );
surfaceclient->closeTransaction();
surface = surfaceControl->getSurface();
surface->lock(&info);
bitmap.setConfig(SkBitmap::kARGB_8888_Config, fb_w, fb_h);
bitmap.setIsOpaque(true);
bitmap.setPixels(info.bits);
SkCanvas* canvas = new SkCanvas(bitmap);
surface->unlockAndPost();
int A = 150, R = 128, G = 128, B = 128 ;
while( A < 256)
{
LOGE("Surface <%d %d %d %d>\n", A, R, G, B);
surface->lock(&info);
/*bitmap 的buffer 被重置，surface 为双缓冲，前后buffer被替换因此每次都要重新设置bitmap的内存*/
bitmap.setPixels(info.bits);
bitmap.eraseARGB(A, R, G, B);
surface->unlockAndPost();
A += 20;
sleep(3);
}
SkPaint paint;
int color = 0xff00ff77;
paint.setARGB(color>>24 & 0xff, color>>16 & 0xff, color>>8 & 0xff, color & 0xff);
surface->lock(&info);
bitmap.setPixels(info.bits);
bitmap.eraseARGB(0, 0, 0, 0);
canvas->setBitmapDevice(bitmap);
canvas->drawLine(100, 100, 500, 500, paint);
surface->unlockAndPost();
sleep(3);
surface->lock(&info);
bitmap.setPixels(info.bits);
bitmap.eraseARGB(0, 0, 0, 0);
SkRect rect;
rect.fLeft = 200;
rect.fTop = 200;
rect.fRight = 400;
rect.fBottom = 400;
color = 0xffff0077;
paint.setARGB(color>>24 & 0xff, color>>16 & 0xff, color>>8 & 0xff, color & 0xff);
canvas->setBitmapDevice(bitmap);
canvas->drawRect(rect, paint);
surface->unlockAndPost();
sleep(3);
surface->lock(&info);
bitmap.setPixels(info.bits);
bitmap.eraseARGB(0, 0, 0, 0);
color = 0xff0f00ff;
paint.setARGB(color>>24 & 0xff, color>>16 & 0xff, color>>8 & 0xff, color & 0xff);
canvas->setBitmapDevice(bitmap);
canvas->drawCircle(640, 260, 100, paint);
surface->unlockAndPost();
sleep(3);
surface->lock(&info);
bitmap.setIsOpaque(false);
bitmap.setPixels(info.bits);
bitmap.eraseColor(0);
canvas->setBitmapDevice(bitmap);
/* 在这里原来使用的是bitmap，但是没有显示出来，仔细分析了一下，觉得原因在图片解码的时候，
* bitmap内存被重新分配。可以看一下skia的源码。在这里画出的2.png的位置有点问题，但是jpg的
* 图片的位置时正确的，没找到原因。
*/
SkBitmap Ibitmap;
SkFileDecoder(&Ibitmap, "/swcommon/1.png", 32);
SkRect dst{0, 0, bitmap.width(), bitmap.height()};
SkIRect src{0, 0, Ibitmap.width(), Ibitmap.height()};
canvas->drawBitmapRect(Ibitmap, &src, dst);
Ibitmap.eraseColor(0);
SkFileDecoder(&Ibitmap, "/swcommon/2.png", 32);
SkRect dst2{200, 200, 700, 500};
canvas->drawBitmapRect(Ibitmap, &src, dst2);
surface->unlockAndPost();
sleep(3);
surface->lock(&info);
bitmap.setPixels(info.bits);
bitmap.eraseColor(0);
canvas->setBitmapDevice(bitmap);
Ibitmap.eraseColor(0);
SkFileDecoder(&Ibitmap, "/swcommon/1.jpg", 32);
SkIRect srcj{0, 0, Ibitmap.width(), Ibitmap.height()};
canvas->drawBitmapRect(Ibitmap, &srcj, dst);
Ibitmap.eraseColor(0);
SkFileDecoder(&Ibitmap, "/swcommon/2.jpg", 32);
SkRect dst4{200, 200, 700, 500};
canvas->drawBitmapRect(Ibitmap, &src, dst4);
SkImageEncoder::EncodeFile("/swcommon/screenshot.jpg", bitmap, SkImageEncoder::kJPEG_Type, 100);
surface->unlockAndPost();
sleep(3);
LOGE("[%s %s %d] END !\n", __FUNCTION__, __FILE__, __LINE__);
return 0;
}

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