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.glrenderer.GLCanvas; 7 import com.android.gallery3d.glrenderer.RawTexture; 8 import com.android.gallery3d.ui.GLRoot.OnGLIdleListener; 9 10 public class PreparePageFadeoutTexture implements OnGLIdleListener { 11 private static final long TIMEOUT = 200; 12 public static final String KEY_FADE_TEXTURE = "fade_texture"; 13 14 private RawTexture mTexture; 15 private ConditionVariable mResultReady = new ConditionVariable(false); 16 private boolean mCancelled = false; 17 private GLView mRootPane; 18 PreparePageFadeoutTexture(GLView rootPane)19 public PreparePageFadeoutTexture(GLView rootPane) { 20 int w = rootPane.getWidth(); 21 int h = rootPane.getHeight(); 22 if (w == 0 || h == 0) { 23 mCancelled = true; 24 return; 25 } 26 mTexture = new RawTexture(w, h, true); 27 mRootPane = rootPane; 28 } 29 isCancelled()30 public boolean isCancelled() { 31 return mCancelled; 32 } 33 get()34 public synchronized RawTexture get() { 35 if (mCancelled) { 36 return null; 37 } else if (mResultReady.block(TIMEOUT)) { 38 return mTexture; 39 } else { 40 mCancelled = true; 41 return null; 42 } 43 } 44 45 @Override onGLIdle(GLCanvas canvas, boolean renderRequested)46 public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) { 47 if (!mCancelled) { 48 try { 49 canvas.beginRenderTarget(mTexture); 50 mRootPane.render(canvas); 51 canvas.endRenderTarget(); 52 } catch (RuntimeException e) { 53 mTexture = null; 54 } 55 } else { 56 mTexture = null; 57 } 58 mResultReady.open(); 59 return false; 60 } 61 prepareFadeOutTexture(AbstractGalleryActivity activity, GLView rootPane)62 public static void prepareFadeOutTexture(AbstractGalleryActivity activity, 63 GLView rootPane) { 64 PreparePageFadeoutTexture task = new PreparePageFadeoutTexture(rootPane); 65 if (task.isCancelled()) return; 66 GLRoot root = activity.getGLRoot(); 67 RawTexture texture = null; 68 root.unlockRenderThread(); 69 try { 70 root.addOnGLIdleListener(task); 71 texture = task.get(); 72 } finally { 73 root.lockRenderThread(); 74 } 75 76 if (texture == null) { 77 return; 78 } 79 activity.getTransitionStore().put(KEY_FADE_TEXTURE, texture); 80 } 81 } 82