Wallpapers: new transitions, hiding when not visible, other cleanup.

This is work on the transitions with wallpapers.  There are now new
animations specifically for leaving the wallpaper and returning to
it, which allow us to have a consistent animation when entering home
and returning to it.  I also renamed the existing animations across
wallpapers, and cleaned up some junk in the various interpolators.

This also now hides the wallpaper surface when it is not visible,
to get rid of the wallpaper flickers people complained about albeit
in a somewhat brutal way. :)  (Though really returning us to the
previous behavior with the same previous bugs and name back to them
not being very visible, yay!)  There is are also some bug fixes
here and there about managing the wallpaper visibility that this
change revealed.

Change-Id: I913990a9a81651728122ed2e1101b75ed2c36fcb
diff --git a/services/java/com/android/server/WindowManagerService.java b/services/java/com/android/server/WindowManagerService.java
index 1ea1b31..b4f4768 100644
--- a/services/java/com/android/server/WindowManagerService.java
+++ b/services/java/com/android/server/WindowManagerService.java
@@ -1193,6 +1193,20 @@
         moveInputMethodDialogsLocked(findDesiredInputMethodWindowIndexLocked(true));
     }
 
+    final boolean isWallpaperVisible(WindowState wallpaperTarget) {
+        if (DEBUG_WALLPAPER) Log.v(TAG, "Wallpaper vis: target obscured="
+                + (wallpaperTarget != null ? Boolean.toString(wallpaperTarget.mObscured) : "??")
+                + " anim=" + ((wallpaperTarget != null && wallpaperTarget.mAppToken != null)
+                        ? wallpaperTarget.mAppToken.animation : null)
+                + " upper=" + mUpperWallpaperTarget
+                + " lower=" + mLowerWallpaperTarget);
+        return (wallpaperTarget != null
+                        && (!wallpaperTarget.mObscured || (wallpaperTarget.mAppToken != null
+                                && wallpaperTarget.mAppToken.animation != null)))
+                || mUpperWallpaperTarget != null
+                || mLowerWallpaperTarget != null;
+    }
+    
     boolean adjustWallpaperWindowsLocked() {
         boolean changed = false;
         
@@ -1352,7 +1366,7 @@
         if (visible) {
             // The window is visible to the compositor...  but is it visible
             // to the user?  That is what the wallpaper cares about.
-            visible = !foundW.mObscured;
+            visible = isWallpaperVisible(foundW);
             if (DEBUG_WALLPAPER) Log.v(TAG, "Wallpaper visibility: " + visible);
             
             // If the wallpaper target is animating, we may need to copy
@@ -1377,6 +1391,8 @@
                 foundW = wb;
                 foundI--;
             }
+        } else {
+            if (DEBUG_WALLPAPER) Log.v(TAG, "Wallpaper not visible");
         }
         
         // Okay i is the position immediately above the wallpaper.  Look at
@@ -1394,6 +1410,8 @@
         while (curTokenIndex > 0) {
             curTokenIndex--;
             WindowToken token = mWallpaperTokens.get(curTokenIndex);
+            token.hidden = !visible;
+            
             int curWallpaperIndex = token.windows.size();
             while (curWallpaperIndex > 0) {
                 curWallpaperIndex--;
@@ -1548,8 +1566,7 @@
     }
     
     void updateWallpaperVisibilityLocked() {
-        final boolean visible = mWallpaperTarget != null
-                && !mWallpaperTarget.mObscured;
+        final boolean visible = isWallpaperVisible(mWallpaperTarget);
         final int dw = mDisplay.getWidth();
         final int dh = mDisplay.getHeight();
         
@@ -1557,6 +1574,8 @@
         while (curTokenIndex > 0) {
             curTokenIndex--;
             WindowToken token = mWallpaperTokens.get(curTokenIndex);
+            token.hidden = !visible;
+            
             int curWallpaperIndex = token.windows.size();
             while (curWallpaperIndex > 0) {
                 curWallpaperIndex--;
@@ -1569,7 +1588,7 @@
                     wallpaper.mWallpaperVisible = visible;
                     try {
                         if (DEBUG_VISIBILITY || DEBUG_WALLPAPER) Log.v(TAG,
-                                "Setting visibility of wallpaper " + wallpaper
+                                "Updating visibility of wallpaper " + wallpaper
                                 + ": " + visible);
                         wallpaper.mClient.dispatchAppVisibility(visible);
                     } catch (RemoteException e) {
@@ -2408,15 +2427,25 @@
                                 ? com.android.internal.R.styleable.WindowAnimation_taskToBackEnterAnimation
                                 : com.android.internal.R.styleable.WindowAnimation_taskToBackExitAnimation;
                         break;
-                    case WindowManagerPolicy.TRANSIT_WALLPAPER_ACTIVITY_OPEN:
+                    case WindowManagerPolicy.TRANSIT_WALLPAPER_OPEN:
                         animAttr = enter
-                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperActivityOpenEnterAnimation
-                                : com.android.internal.R.styleable.WindowAnimation_wallpaperActivityOpenExitAnimation;
+                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperOpenEnterAnimation
+                                : com.android.internal.R.styleable.WindowAnimation_wallpaperOpenExitAnimation;
                         break;
-                    case WindowManagerPolicy.TRANSIT_WALLPAPER_ACTIVITY_CLOSE:
+                    case WindowManagerPolicy.TRANSIT_WALLPAPER_CLOSE:
                         animAttr = enter
-                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperActivityCloseEnterAnimation
-                                : com.android.internal.R.styleable.WindowAnimation_wallpaperActivityCloseExitAnimation;
+                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperCloseEnterAnimation
+                                : com.android.internal.R.styleable.WindowAnimation_wallpaperCloseExitAnimation;
+                        break;
+                    case WindowManagerPolicy.TRANSIT_WALLPAPER_INTRA_OPEN:
+                        animAttr = enter
+                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperIntraOpenEnterAnimation
+                                : com.android.internal.R.styleable.WindowAnimation_wallpaperIntraOpenExitAnimation;
+                        break;
+                    case WindowManagerPolicy.TRANSIT_WALLPAPER_INTRA_CLOSE:
+                        animAttr = enter
+                                ? com.android.internal.R.styleable.WindowAnimation_wallpaperIntraCloseEnterAnimation
+                                : com.android.internal.R.styleable.WindowAnimation_wallpaperIntraCloseExitAnimation;
                         break;
                 }
                 a = loadAnimation(lp, animAttr);
@@ -7346,11 +7375,15 @@
         }
 
         /**
-         * Return true if the window is opaque and fully drawn.
+         * Return true if the window is opaque and fully drawn.  This indicates
+         * it may obscure windows behind it.
          */
         boolean isOpaqueDrawn() {
-            return mAttrs.format == PixelFormat.OPAQUE && mSurface != null
-                    && mAnimation == null && !mDrawPending && !mCommitDrawPending;
+            return (mAttrs.format == PixelFormat.OPAQUE
+                            || mAttrs.type == TYPE_WALLPAPER)
+                    && mSurface != null && mAnimation == null
+                    && (mAppToken == null || mAppToken.animation == null)
+                    && !mDrawPending && !mCommitDrawPending;
         }
 
         boolean needsBackgroundFiller(int screenWidth, int screenHeight) {
@@ -8964,6 +8997,8 @@
                             mToTopApps.clear();
                         }
                         
+                        WindowState oldWallpaper = mWallpaperTarget;
+                        
                         adjustWallpaperWindowsLocked();
                         wallpaperMayChange = false;
                         
@@ -8971,54 +9006,66 @@
                                 "New wallpaper target=" + mWallpaperTarget
                                 + ", lower target=" + mLowerWallpaperTarget
                                 + ", upper target=" + mUpperWallpaperTarget);
+                        int foundWallpapers = 0;
                         if (mLowerWallpaperTarget != null) {
                             // Need to determine if both the closing and
                             // opening app token sets are wallpaper targets,
                             // in which case special animations are needed
                             // (since the wallpaper needs to stay static
                             // behind them).
-                            int found = 0;
-                            NN = mOpeningApps.size();
-                            for (i=0; i<NN; i++) {
-                                AppWindowToken wtoken = mOpeningApps.get(i);
-                                if (mLowerWallpaperTarget.mAppToken == wtoken) {
-                                    found |= 1;
-                                }
-                                if (mUpperWallpaperTarget.mAppToken == wtoken) {
-                                    found |= 1;
-                                }
-                            }
                             NN = mClosingApps.size();
                             for (i=0; i<NN; i++) {
                                 AppWindowToken wtoken = mClosingApps.get(i);
                                 if (mLowerWallpaperTarget.mAppToken == wtoken) {
-                                    found |= 2;
+                                    foundWallpapers |= 1;
                                 }
                                 if (mUpperWallpaperTarget.mAppToken == wtoken) {
-                                    found |= 2;
+                                    foundWallpapers |= 1;
                                 }
                             }
-                            
-                            if (found == 3) {
-                                if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
-                                        "Wallpaper animation!");
-                                switch (transit) {
-                                    case WindowManagerPolicy.TRANSIT_ACTIVITY_OPEN:
-                                    case WindowManagerPolicy.TRANSIT_TASK_OPEN:
-                                    case WindowManagerPolicy.TRANSIT_TASK_TO_FRONT:
-                                        transit = WindowManagerPolicy.TRANSIT_WALLPAPER_ACTIVITY_OPEN;
-                                        break;
-                                    case WindowManagerPolicy.TRANSIT_ACTIVITY_CLOSE:
-                                    case WindowManagerPolicy.TRANSIT_TASK_CLOSE:
-                                    case WindowManagerPolicy.TRANSIT_TASK_TO_BACK:
-                                        transit = WindowManagerPolicy.TRANSIT_WALLPAPER_ACTIVITY_CLOSE;
-                                        break;
+                            NN = mOpeningApps.size();
+                            for (i=0; i<NN; i++) {
+                                AppWindowToken wtoken = mOpeningApps.get(i);
+                                if (mLowerWallpaperTarget.mAppToken == wtoken) {
+                                    foundWallpapers |= 2;
                                 }
-                                if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
-                                        "New transit: " + transit);
+                                if (mUpperWallpaperTarget.mAppToken == wtoken) {
+                                    foundWallpapers |= 2;
+                                }
                             }
                         }
                         
+                        if (foundWallpapers == 3) {
+                            if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
+                                    "Wallpaper animation!");
+                            switch (transit) {
+                                case WindowManagerPolicy.TRANSIT_ACTIVITY_OPEN:
+                                case WindowManagerPolicy.TRANSIT_TASK_OPEN:
+                                case WindowManagerPolicy.TRANSIT_TASK_TO_FRONT:
+                                    transit = WindowManagerPolicy.TRANSIT_WALLPAPER_INTRA_OPEN;
+                                    break;
+                                case WindowManagerPolicy.TRANSIT_ACTIVITY_CLOSE:
+                                case WindowManagerPolicy.TRANSIT_TASK_CLOSE:
+                                case WindowManagerPolicy.TRANSIT_TASK_TO_BACK:
+                                    transit = WindowManagerPolicy.TRANSIT_WALLPAPER_INTRA_CLOSE;
+                                    break;
+                            }
+                            if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
+                                    "New transit: " + transit);
+                        } else if (oldWallpaper != null) {
+                            // We are transitioning from an activity with
+                            // a wallpaper to one without.
+                            transit = WindowManagerPolicy.TRANSIT_WALLPAPER_CLOSE;
+                            if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
+                                    "New transit away from wallpaper: " + transit);
+                        } else if (mWallpaperTarget != null) {
+                            // We are transitioning from an activity without
+                            // a wallpaper to now showing the wallpaper
+                            transit = WindowManagerPolicy.TRANSIT_WALLPAPER_OPEN;
+                            if (DEBUG_APP_TRANSITIONS) Log.v(TAG,
+                                    "New transit into wallpaper: " + transit);
+                        }
+                        
                         // We need to figure out which animation to use...
                         WindowManager.LayoutParams lp = findAnimations(mAppTokens,
                                 mOpeningApps, mClosingApps);
@@ -9381,9 +9428,8 @@
                         }
                     }
 
-                    boolean opaqueDrawn = w.isOpaqueDrawn();
-                    if ((opaqueDrawn && w.isFullscreen(dw, dh))
-                            || attrs.type == TYPE_WALLPAPER) {
+                    boolean opaqueDrawn = canBeSeen && w.isOpaqueDrawn();
+                    if (opaqueDrawn && w.isFullscreen(dw, dh)) {
                         // This window completely covers everything behind it,
                         // so we want to leave all of them as unblurred (for
                         // performance reasons).