Don't create a giant layer for all notifications

Bug #6642475

When expanding the status bar, create one layer per notification instead of
a single giant layer for the pile of notifications. This prevents layer
creation failure when the total height of the notifications is larger
than the maximum allowed texture size in OpenGL ES 2.0.

This change only enables layers on notifications that will be visible
once the notification area is fully expanded.

Change-Id: I3c791a66cf5ac0973f3a65cfcd84b95209d580f3

Author: Romain Guy

core/java/android/view/ViewRootImpl.java

@@ -3926,10 +3926,9 @@ public void debug() {
     }
 
     public void dumpGfxInfo(int[] info) {
+        info[0] = info[1] = 0;
         if (mView != null) {
             getGfxInfo(mView, info);
-        } else {
-            info[0] = info[1] = 0;
         }
     }
 

core/java/android/view/WindowManagerImpl.java

@@ -530,13 +530,16 @@ public void dumpGfxInfo(FileDescriptor fd) {
 
                     for (int i = 0; i < count; i++) {
                         ViewRootImpl root = mRoots[i];
+                        String name = getWindowName(root);
+                        pw.printf("\n\t%s", name);
+
                         HardwareRenderer renderer = root.getView().mAttachInfo.mHardwareRenderer;
                         if (renderer != null) {
                             renderer.dumpGfxInfo(pw);
                         }
                     }
 
-                    pw.println("\nView hierarchy:");
+                    pw.println("\nView hierarchy:\n");
 
                     int viewsCount = 0;
                     int displayListsSize = 0;
@@ -546,15 +549,14 @@ public void dumpGfxInfo(FileDescriptor fd) {
                         ViewRootImpl root = mRoots[i];
                         root.dumpGfxInfo(info);
 
-                        String name = root.getClass().getName() + '@' +
-                                Integer.toHexString(hashCode());                        
-                        pw.printf("  %s: %d views, %.2f kB (display lists)",
+                        String name = getWindowName(root);
+                        pw.printf("  %s\n  %d views, %.2f kB of display lists",
                                 name, info[0], info[1] / 1024.0f);
                         HardwareRenderer renderer = root.getView().mAttachInfo.mHardwareRenderer;
                         if (renderer != null) {
                             pw.printf(", %d frames rendered", renderer.getFrameCount());
                         }
-                        pw.printf("\n");
+                        pw.printf("\n\n");
 
                         viewsCount += info[0];
                         displayListsSize += info[1];
@@ -570,6 +572,11 @@ public void dumpGfxInfo(FileDescriptor fd) {
         }        
     }
 
+    private static String getWindowName(ViewRootImpl root) {
+        return root.mWindowAttributes.getTitle() + "/" +
+                root.getClass().getName() + '@' + Integer.toHexString(root.hashCode());
+    }
+
     public void setStoppedState(IBinder token, boolean stopped) {
         synchronized (this) {
             if (mViews == null)

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -1376,12 +1376,59 @@ void stopTracking() {
         if (!mTracking)
             return;
         mTracking = false;
-        mPile.setLayerType(View.LAYER_TYPE_NONE, null);
+        setPileLayers(View.LAYER_TYPE_NONE);
         mVelocityTracker.recycle();
         mVelocityTracker = null;
         mCloseView.setPressed(false);
     }
 
+    /**
+     * Enables or disables layers on the children of the notifications pile.
+     * 
+     * When layers are enabled, this method attempts to enable layers for the minimal
+     * number of children. Only children visible when the notification area is fully
+     * expanded will receive a layer. The technique used in this method might cause
+     * more children than necessary to get a layer (at most one extra child with the
+     * current UI.)
+     * 
+     * @param layerType {@link View#LAYER_TYPE_NONE} or {@link View#LAYER_TYPE_HARDWARE}
+     */
+    private void setPileLayers(int layerType) {
+        final int count = mPile.getChildCount();
+
+        switch (layerType) {
+            case View.LAYER_TYPE_NONE:
+                for (int i = 0; i < count; i++) {
+                    mPile.getChildAt(i).setLayerType(layerType, null);
+                }
+                break;
+            case View.LAYER_TYPE_HARDWARE:
+                final int[] location = new int[2]; 
+                mNotificationPanel.getLocationInWindow(location);
+
+                final int left = location[0];
+                final int top = location[1];
+                final int right = left + mNotificationPanel.getWidth();
+                final int bottom = top + getExpandedViewMaxHeight();
+
+                final Rect childBounds = new Rect();
+
+                for (int i = 0; i < count; i++) {
+                    final View view = mPile.getChildAt(i);
+                    view.getLocationInWindow(location);
+
+                    childBounds.set(location[0], location[1],
+                            location[0] + view.getWidth(), location[1] + view.getHeight());
+
+                    if (childBounds.intersects(left, top, right, bottom)) {
+                        view.setLayerType(layerType, null);
+                    }
+                }
+
+                break;
+        }
+    }
+
     void incrementAnim(long frameTimeNanos) {
         final long deltaNanos = Math.max(frameTimeNanos - mAnimLastTimeNanos, 0);
         final float t = deltaNanos * 0.000000001f;                  // ns -> s
@@ -1421,7 +1468,7 @@ void prepareTracking(int y, boolean opening) {
         mCloseView.setPressed(true);
 
         mTracking = true;
-        mPile.setLayerType(View.LAYER_TYPE_HARDWARE, null);
+        setPileLayers(View.LAYER_TYPE_HARDWARE);
         mVelocityTracker = VelocityTracker.obtain();
         if (opening) {
             makeExpandedVisible(true);