Some optimizations in blur outline generator

1) Using ALPHA_8 as the start and end bitmap. This removes one extra
   bitmap generation step
2) Using ByteBuffer on ALPHA_8 bitmap for clipAlpha. This allows us
   to use byteArray instead of intArray for representing pixels

Change-Id: I1b654c439fd491b6b91180ddc562bb97fad857aa

1 files changed, 2 insertions, 4 deletions

diff --git a/src/com/android/launcher3/widget/PendingItemPreviewProvider.java b/src/com/android/launcher3/widget/PendingItemPreviewProvider.java
index 8739390c4..eaa0bb3d5 100644
--- a/src/com/android/launcher3/widget/PendingItemPreviewProvider.java
+++ b/src/com/android/launcher3/widget/PendingItemPreviewProvider.java
@@ -24,7 +24,6 @@ import android.view.View;
 import com.android.launcher3.HolographicOutlineHelper;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.PendingAddItemInfo;
-import com.android.launcher3.R;
 import com.android.launcher3.Workspace;
 import com.android.launcher3.graphics.DragPreviewProvider;
 
@@ -50,7 +49,7 @@ public class PendingItemPreviewProvider extends DragPreviewProvider {
 
         int w = size[0];
         int h = size[1];
-        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
+        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ALPHA_8);
         canvas.setBitmap(b);
 
         Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
@@ -68,9 +67,8 @@ public class PendingItemPreviewProvider extends DragPreviewProvider {
         // Don't clip alpha values for the drag outline if we're using the default widget preview
         boolean clipAlpha = !(mAddInfo instanceof PendingAddWidgetInfo &&
                 (((PendingAddWidgetInfo) mAddInfo).previewImage == 0));
-        final int outlineColor = mView.getResources().getColor(R.color.outline_color);
         HolographicOutlineHelper.obtain(mView.getContext())
-                .applyExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor, clipAlpha);
+                .applyExpensiveOutlineWithBlur(b, canvas, clipAlpha);
         canvas.setBitmap(null);
 
         return b;