标签:square upd rri 系统 running 资源 理想 xtu print
http://blog.csdn.net/u010949962/article/details/41865777
最近要把Android 原生的View渲染到OpenGL GLSurfaceView中,起初想到的是截图的方法,也就是把View截取成bitmap后,再把Bitmap渲染到OpenGL中;但是明显这种方法是不可行的,面对一些高速动态更新的View,只有不停的对view 进行截图才能渲染出原生View的效果。
通过大量的Google终于在国外的网站找到了一个做过类似的先例(链接:http://www.felixjones.co.uk/neo%20website/Android_View/)。不过经过测试该方法只能渲染直接父类为View的view,也就是只能渲染一层View(如progressbar,没不能添加child的view),当该原生Android View包含很多子view时(也就是根View为FramLayout、或者linearLayout之类),无法实时的监听到View动态改变,OpenGL中只能不停的渲染该view,才能渲染出原生View的效果。但是这样一来不同的渲染会耗费大量的资源,降低应用程序的效率。理想中的话,是监听到了该View的内容或者其子view 的内容发生了变化(如:View中的字幕发生滚动)才进行渲染。
经过接近两周的努力我终于完美地实现了该效果,既然是站在别人的基础上得来的成果,那么该方法就应当被共享,所以产生了此文,不过只支持api 15以上的
步骤一:重写根View
1.设置该View 绘制自己:
2.监听View的变化,重写View,用ViewTreeObServer来监听,方法如下:
- private void addOnPreDrawListener() {
-
- if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
-
- final ViewTreeObserver mObserver = getViewTreeObserver();
- if (mObserver != null) {
- mObserver.addOnPreDrawListener(new OnPreDrawListener() {
-
- @Override
- public boolean onPreDraw() {
- if (isDirty()) {
- invalidate();
- }
- return true;
- }
- });
- }
- }
- }
3.重写该View的onDraw方法:
- @Override
- protected void onDraw(Canvas canvas) {
- try {
- if (mSurface != null) {
- Canvas surfaceCanvas = mSurface.lockCanvas(null);
- super.dispatchDraw(surfaceCanvas);
- mSurface.unlockCanvasAndPost(surfaceCanvas);
-
- mSurface.release();
- mSurface = null;
- mSurface = new Surface(mSurfaceTexture);
- }
- } catch (OutOfResourcesException e) {
- e.printStackTrace();
- }
- }
步骤二:GLSurfaceView.Renderer
- class CustomRenderer implements GLSurfaceView.Renderer {
- int glSurfaceTex;
- private final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
- long currentTime;
- long previousTime;
- boolean b = false;
- int frameCount = 0;
- DirectDrawer mDirectDrawer;
- ActivityManager activityManager;
- MemoryInfo _memoryInfo;
-
-
-
- private int TEXTURE_WIDTH = 360;
- private int TEXTURE_HEIGHT = 360;
-
- Context context;
-
- private LauncherAppWidgetHostView addedWidgetView;
-
- private SurfaceTexture surfaceTexture = null;
-
- private Surface surface;
-
- float fps;
-
- public CustomRenderer(Context context, LauncherAppWidgetHostView addedWidgetView, Display mDisplay){
- this.context = context;
- this.addedWidgetView = addedWidgetView;
- TEXTURE_WIDTH = mDisplay.getWidth();
- TEXTURE_HEIGHT = mDisplay.getHeight();
- _memoryInfo = new MemoryInfo();
- activityManager = (ActivityManager) context.getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
- }
-
- @Override
- public void onDrawFrame(GL10 gl) {
-
- synchronized (this) {
- surfaceTexture.updateTexImage();
- }
-
- activityManager.getMemoryInfo(_memoryInfo);
-
- GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
- GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
- GLES20.glEnable(GLES20.GL_BLEND);
- GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA);
-
- float[] mtx = new float[16];
- surfaceTexture.getTransformMatrix(mtx);
- mDirectDrawer.draw(mtx);
-
- calculateFps();
-
-
-
- }
-
- private void getAppMemorySize(){
- ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
- android.os.Debug.MemoryInfo[] memoryInfos = mActivityManager.getProcessMemoryInfo(new int[]{android.os.Process.myPid()});
- int size = memoryInfos[0].dalvikPrivateDirty;
- Log.w("getAppMemorySize", size / 1024 + " MB");
- }
-
-
- private void getRunningAppProcessInfo() {
- ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
-
-
- List<RunningAppProcessInfo> runningAppProcessesList = mActivityManager.getRunningAppProcesses();
-
- for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcessesList) {
-
- int pid = runningAppProcessInfo.pid;
-
- int uid = runningAppProcessInfo.uid;
-
- String processName = runningAppProcessInfo.processName;
-
- int[] pids = new int[] {pid};
- Debug.MemoryInfo[] memoryInfo = mActivityManager.getProcessMemoryInfo(pids);
- int memorySize = memoryInfo[0].dalvikPrivateDirty;
-
- System.out.println("processName="+processName+",currentPid: "+ "pid= " +android.os.Process.myPid()+"----------->"+pid+",uid="+uid+",memorySize="+memorySize+"kb");
- }
- }
-
- @Override
- public void onSurfaceCreated(GL10 gl, EGLConfig config) {
-
- surface = null;
- surfaceTexture = null;
-
- glSurfaceTex = Engine_CreateSurfaceTexture(TEXTURE_WIDTH, TEXTURE_HEIGHT);
- Log.d("GLES20Ext", "glSurfaceTex" + glSurfaceTex);
- if (glSurfaceTex > 0) {
- surfaceTexture = new SurfaceTexture(glSurfaceTex);
- surfaceTexture.setDefaultBufferSize(TEXTURE_WIDTH, TEXTURE_HEIGHT);
- surface = new Surface(surfaceTexture);
- addedWidgetView.setSurface(surface);
- addedWidgetView.setSurfaceTexture(surfaceTexture);
-
- mDirectDrawer = new DirectDrawer(glSurfaceTex);
- }
- }
-
- float calculateFps() {
-
- frameCount++;
- if (!b) {
- b = true;
- previousTime = System.currentTimeMillis();
- }
- long intervalTime = System.currentTimeMillis() - previousTime;
-
- if (intervalTime >= 1000) {
- b = false;
- fps = frameCount / (intervalTime / 1000f);
- frameCount = 0;
- Log.w("calculateFps", "FPS: " + fps);
- }
-
- return fps;
- }
-
- int Engine_CreateSurfaceTexture(int width, int height) {
-
-
- int[] textures = new int[1];
- GLES20.glGenTextures(1, textures, 0);
-
- glSurfaceTex = textures[0];
-
- if (glSurfaceTex > 0) {
- GLES20.glBindTexture(GL_TEXTURE_EXTERNAL_OES, glSurfaceTex);
-
-
- GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGB, width, height, 0, GLES20.GL_RGB, GLES20.GL_UNSIGNED_BYTE, null);
-
- GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
- GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
-
- GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
- GLES20.glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
- }
- return glSurfaceTex;
- }
-
- @Override
- public void onSurfaceChanged(GL10 gl, int width, int height) {
-
- }
- }
- public class DirectDrawer {
- private final String vertexShaderCode =
- "attribute vec4 vPosition;" +
- "attribute vec2 inputTextureCoordinate;" +
- "varying vec2 textureCoordinate;" +
- "void main()" +
- "{"+
- "gl_Position = vPosition;"+
- "textureCoordinate = inputTextureCoordinate;" +
- "}";
-
- private final String fragmentShaderCode =
- "#extension GL_OES_EGL_image_external : require\n"+
- "precision mediump float;" +
- "varying vec2 textureCoordinate;\n" +
- "uniform samplerExternalOES s_texture;\n" +
- "void main() {" +
- " gl_FragColor = texture2D( s_texture, textureCoordinate );\n" +
- "}";
-
- private FloatBuffer vertexBuffer, textureVerticesBuffer;
- private ShortBuffer drawListBuffer;
- private final int mProgram;
- private int mPositionHandle;
- private int mTextureCoordHandle;
-
- private short drawOrder[] = { 0, 1, 2, 0, 2, 3 };
-
-
- private static final int COORDS_PER_VERTEX = 2;
-
- private final int vertexStride = COORDS_PER_VERTEX * 4;
-
- static float squareCoords[] = {
- -1.0f, 0.0f,
- -1.0f, -2.2f,
- 1.0f, -2.2f,
- 1.0f, 0.0f,
- };
-
- static float textureVertices[] = {
- 0f, 0f,
- 0f, 1f,
- 1f, 1f,
- 1f, 0f,
- };
-
- private int texture;
-
- public DirectDrawer(int texture)
- {
- this.texture = texture;
-
- ByteBuffer bb = ByteBuffer.allocateDirect(squareCoords.length * 4);
- bb.order(ByteOrder.nativeOrder());
- vertexBuffer = bb.asFloatBuffer();
- vertexBuffer.put(squareCoords);
- vertexBuffer.position(0);
-
-
- ByteBuffer dlb = ByteBuffer.allocateDirect(drawOrder.length * 2);
- dlb.order(ByteOrder.nativeOrder());
- drawListBuffer = dlb.asShortBuffer();
- drawListBuffer.put(drawOrder);
- drawListBuffer.position(0);
-
- ByteBuffer bb2 = ByteBuffer.allocateDirect(textureVertices.length * 4);
- bb2.order(ByteOrder.nativeOrder());
- textureVerticesBuffer = bb2.asFloatBuffer();
- textureVerticesBuffer.put(textureVertices);
- textureVerticesBuffer.position(0);
-
- int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
- int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
-
- mProgram = GLES20.glCreateProgram();
- GLES20.glAttachShader(mProgram, vertexShader);
- GLES20.glAttachShader(mProgram, fragmentShader);
- GLES20.glLinkProgram(mProgram);
- }
-
- public void draw(float[] mtx)
- {
- GLES20.glUseProgram(mProgram);
-
- GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
- GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texture);
-
-
- mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
-
-
- GLES20.glEnableVertexAttribArray(mPositionHandle);
-
-
- GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX, GLES20.GL_FLOAT, false, vertexStride, vertexBuffer);
-
- mTextureCoordHandle = GLES20.glGetAttribLocation(mProgram, "inputTextureCoordinate");
- GLES20.glEnableVertexAttribArray(mTextureCoordHandle);
-
-
-
-
-
-
- GLES20.glVertexAttribPointer(mTextureCoordHandle, COORDS_PER_VERTEX, GLES20.GL_FLOAT, false, vertexStride, textureVerticesBuffer);
-
- GLES20.glDrawElements(GLES20.GL_TRIANGLES, drawOrder.length, GLES20.GL_UNSIGNED_SHORT, drawListBuffer);
-
-
- GLES20.glDisableVertexAttribArray(mPositionHandle);
- GLES20.glDisableVertexAttribArray(mTextureCoordHandle);
- }
-
- private int loadShader(int type, String shaderCode){
-
-
-
- int shader = GLES20.glCreateShader(type);
-
-
- GLES20.glShaderSource(shader, shaderCode);
- GLES20.glCompileShader(shader);
-
- return shader;
- }
- private float[] transformTextureCoordinates( float[] coords, float[] matrix)
- {
- float[] result = new float[ coords.length ];
- float[] vt = new float[4];
-
- for ( int i = 0 ; i < coords.length ; i += 2 ) {
- float[] v = { coords[i], coords[i+1], 0 , 1 };
- Matrix.multiplyMV(vt, 0, matrix, 0, v, 0);
- result[i] = vt[0];
- result[i+1] = vt[1];
- }
- return result;
- }
- }
步骤三:配置GLSurfaceView:
- GLSurfaceView glSurfaceView = new GLSurfaceView(getApplicationContext());
-
- glSurfaceView.setEGLContextClientVersion(2);
- glSurfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
- glSurfaceView.setRenderer(renderer);
-
- glSurfaceView.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
效果如图所示,上面是猎豹清理大师的widget,下面是GLSurfaceView的Texture,原生的Widget和OpenGL中渲染的一模一样。并且点击widget进行清理时也能达到实时渲染的Veiw动画清理效果,源码链接:https://github.com/MrHuangXin/RenderViewToOpenGL/tree/master
把Android原生的View渲染到OpenGL Texture
标签:square upd rri 系统 running 资源 理想 xtu print
原文地址:http://www.cnblogs.com/jukan/p/6846947.html