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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 package com.android.magicsmoke;
     19 
     20 import android.service.wallpaper.WallpaperService;
     21 import android.graphics.PixelFormat;
     22 import android.renderscript.RenderScriptGL;
     23 import android.renderscript.RenderScript;
     24 import android.util.Log;
     25 import android.view.MotionEvent;
     26 import android.view.SurfaceHolder;
     27 import android.view.Surface;
     28 
     29 public abstract class RenderScriptWallpaper<T extends RenderScriptScene> extends WallpaperService {
     30     public Engine onCreateEngine() {
     31         return new RenderScriptEngine();
     32     }
     33 
     34     protected abstract T createScene(int width, int height);
     35 
     36     private class RenderScriptEngine extends Engine {
     37         private RenderScriptGL mRs;
     38         private T mRenderer;
     39 
     40         @Override
     41         public void onCreate(SurfaceHolder surfaceHolder) {
     42             super.onCreate(surfaceHolder);
     43             setTouchEventsEnabled(true);
     44             surfaceHolder.setSizeFromLayout();
     45             surfaceHolder.setFormat(PixelFormat.RGBX_8888);
     46         }
     47 
     48         @Override
     49         public void onDestroy() {
     50             super.onDestroy();
     51             destroyRenderer();
     52         }
     53 
     54         private void destroyRenderer() {
     55             if (mRenderer != null) {
     56                 mRenderer.stop();
     57                 mRenderer = null;
     58             }
     59             if (mRs != null) {
     60                 mRs.destroy();
     61                 mRs = null;
     62             }
     63         }
     64 
     65         @Override
     66         public void onVisibilityChanged(boolean visible) {
     67             super.onVisibilityChanged(visible);
     68             if (mRenderer != null) {
     69                 if (visible) {
     70                     mRenderer.start();
     71                 } else {
     72                     mRenderer.stop();
     73                 }
     74             }
     75         }
     76 
     77         @Override
     78         public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
     79             super.onSurfaceChanged(holder, format, width, height);
     80             if (mRs != null) {
     81                 mRs.contextSetSurface(width, height, holder.getSurface());
     82             }
     83             if (mRenderer == null) {
     84                 mRenderer = createScene(width, height);
     85                 mRenderer.init(mRs, getResources(), isPreview());
     86                 mRenderer.start();
     87             } else {
     88                 mRenderer.resize(width, height);
     89             }
     90         }
     91 
     92         @Override
     93         public void onTouchEvent(MotionEvent event) {
     94             if (mRenderer != null) {
     95                 mRenderer.onTouchEvent(event);
     96             }
     97         }
     98 
     99         @Override
    100         public void onOffsetsChanged(float xOffset, float yOffset,
    101                 float xStep, float yStep, int xPixels, int yPixels) {
    102             if (mRenderer != null) {
    103                 mRenderer.setOffset(xOffset, yOffset, xStep, yStep, xPixels, yPixels);
    104             }
    105         }
    106 
    107         @Override
    108         public void onSurfaceCreated(SurfaceHolder holder) {
    109             super.onSurfaceCreated(holder);
    110 
    111             Surface surface = null;
    112             while (surface == null) {
    113                 surface = holder.getSurface();
    114             }
    115             mRs = new RenderScriptGL(false, false);
    116             mRs.contextSetPriority(RenderScript.Priority.LOW);
    117         }
    118 
    119         @Override
    120         public void onSurfaceDestroyed(SurfaceHolder holder) {
    121             super.onSurfaceDestroyed(holder);
    122             destroyRenderer();
    123         }
    124     }
    125 }
    126