1 package com.android.gallery3d.ui; 2 3 import android.os.ConditionVariable; 4 5 import com.android.gallery3d.app.AbstractGalleryActivity; 6 import com.android.gallery3d.ui.GLRoot.OnGLIdleListener; 7 8 public class PreparePageFadeoutTexture implements OnGLIdleListener { 9 private static final long TIMEOUT = 200; 10 public static final String KEY_FADE_TEXTURE = "fade_texture"; 11 12 private RawTexture mTexture; 13 private ConditionVariable mResultReady = new ConditionVariable(false); 14 private boolean mCancelled = false; 15 private GLView mRootPane; 16 17 public PreparePageFadeoutTexture(GLView rootPane) { 18 int w = rootPane.getWidth(); 19 int h = rootPane.getHeight(); 20 if (w == 0 || h == 0) { 21 mCancelled = true; 22 return; 23 } 24 mTexture = new RawTexture(w, h, true); 25 mRootPane = rootPane; 26 } 27 28 public boolean isCancelled() { 29 return mCancelled; 30 } 31 32 public synchronized RawTexture get() { 33 if (mCancelled) { 34 return null; 35 } else if (mResultReady.block(TIMEOUT)) { 36 return mTexture; 37 } else { 38 mCancelled = true; 39 return null; 40 } 41 } 42 43 @Override 44 public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) { 45 if (!mCancelled) { 46 try { 47 canvas.beginRenderTarget(mTexture); 48 mRootPane.render(canvas); 49 canvas.endRenderTarget(); 50 } catch (RuntimeException e) { 51 mTexture = null; 52 } 53 } else { 54 mTexture = null; 55 } 56 mResultReady.open(); 57 return false; 58 } 59 60 public static void prepareFadeOutTexture(AbstractGalleryActivity activity, 61 GLView rootPane) { 62 PreparePageFadeoutTexture task = new PreparePageFadeoutTexture(rootPane); 63 if (task.isCancelled()) return; 64 GLRoot root = activity.getGLRoot(); 65 RawTexture texture = null; 66 root.unlockRenderThread(); 67 try { 68 root.addOnGLIdleListener(task); 69 texture = task.get(); 70 } finally { 71 root.lockRenderThread(); 72 } 73 74 if (texture == null) { 75 return; 76 } 77 activity.getTransitionStore().put(KEY_FADE_TEXTURE, texture); 78 } 79 } 80
