Always clear dest in SkBitmap::copyTo's draw path

src/core/SkBitmap.cpp

Index: src/core/SkBitmap.cpp
===================================================================
--- src/core/SkBitmap.cpp	(revision 11695)
+++ src/core/SkBitmap.cpp	(working copy)
@@ -1119,10 +1119,8 @@
             }
         }
     } else {
-        // if the src has alpha, we have to clear the dst first
-        if (!src->isOpaque()) {
-            tmpDst.eraseColor(SK_ColorTRANSPARENT);
-        }
+        // Always clear the dest in case one of the blitters accesses it
+        tmpDst.eraseColor(SK_ColorTRANSPARENT);

[reed1, 2013/10/10 15:16:38]

// TODO: switch the allocation of tmpDst to call sk_calloc_throw

[robertphillips, 2013/10/10 15:48:34]

Done.

 
         SkCanvas canvas(tmpDst);
         SkPaint  paint;