Speedup TextView fades (no more layers required.)

Also fixes a crash in the drop shadows cache and improves
drop shadows caching.

Change-Id: I9c0208a49467f9201d786ae0c129194b8d423923

2 files changed, 19 insertions, 1 deletions

diff --git a/core/java/android/text/Layout.java b/core/java/android/text/Layout.java
index 0466c69..54ac906 100644
--- a/core/java/android/text/Layout.java
+++ b/core/java/android/text/Layout.java
@@ -1729,7 +1729,7 @@ public abstract class Layout {
     private Alignment mAlignment = Alignment.ALIGN_NORMAL;
     private float mSpacingMult;
     private float mSpacingAdd;
-    private static Rect sTempRect = new Rect();
+    private static final Rect sTempRect = new Rect();
     private boolean mSpannedText;
 
     public static final int DIR_LEFT_TO_RIGHT = 1;
diff --git a/core/java/android/widget/TextView.java b/core/java/android/widget/TextView.java
index c13ed15..0510701 100644
--- a/core/java/android/widget/TextView.java
+++ b/core/java/android/widget/TextView.java
@@ -197,6 +197,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
     
     private static final int PRIORITY = 100;
 
+    private int mCurrentAlpha = 255;    
     private ColorStateList mTextColor;
     private int mCurTextColor;
     private ColorStateList mHintTextColor;
@@ -3857,6 +3858,22 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
     }
 
     @Override
+    protected boolean onSetAlpha(int alpha) {
+        if (mMovement == null && getBackground() == null) {
+            mCurrentAlpha = alpha;
+            final Drawables dr = mDrawables;
+            if (dr != null) {
+                if (dr.mDrawableLeft != null) dr.mDrawableLeft.setAlpha(alpha);
+                if (dr.mDrawableTop != null) dr.mDrawableTop.setAlpha(alpha);
+                if (dr.mDrawableRight != null) dr.mDrawableRight.setAlpha(alpha);
+                if (dr.mDrawableBottom != null) dr.mDrawableBottom.setAlpha(alpha);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    @Override
     protected void onDraw(Canvas canvas) {
         restartMarqueeIfNeeded();
 
@@ -3953,6 +3970,7 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
         }
 
         mTextPaint.setColor(color);
+        mTextPaint.setAlpha(mCurrentAlpha);
         mTextPaint.drawableState = getDrawableState();
 
         canvas.save();