use pixmaps for dst in sprites -- NO BITMAPS

src/core/SkDraw.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #define __STDC_LIMIT_MACROS
 
 #include "SkDraw.h"
 #include "SkBlitter.h"
@@ skipping 1262 matching lines @@
         // (more or less) identity.
         //
         SkAutoPixmapUnlock unlocker;
         if (!bitmap.requestLock(&unlocker)) {
             return;
         }
         const SkPixmap& pmap = unlocker.pixmap();
         int ix = SkScalarRoundToInt(matrix.getTranslateX());
         int iy = SkScalarRoundToInt(matrix.getTranslateY());
         if (clipHandlesSprite(*fRC, ix, iy, pmap)) {
+            SkPixmap dstPM;
+            if (!fBitmap->peekPixels(&dstPM)) {
+                return;
+            }
             SkTBlitterAllocator allocator;
             // blitter will be owned by the allocator.
-            SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, pmap, ix, iy, &allocator);
+            SkBlitter* blitter = SkBlitter::ChooseSprite(dstPM, paint, pmap, ix, iy, &allocator);
             if (blitter) {
                 SkScan::FillIRect(SkIRect::MakeXYWH(ix, iy, pmap.width(), pmap.height()),
                                   *fRC, blitter);
                 return;
             }
             // if !blitter, then we fall-through to the slower case
         }
     }
 
     // now make a temp draw on the stack, and use it
@@ skipping 34 matching lines @@
     SkPaint paint(origPaint);
     paint.setStyle(SkPaint::kFill_Style);
 
     SkAutoPixmapUnlock unlocker;
     if (!bitmap.requestLock(&unlocker)) {
         return;
     }
     const SkPixmap& pmap = unlocker.pixmap();
 
     if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, pmap)) {
+        SkPixmap dstPM;
+        if (!fBitmap->peekPixels(&dstPM)) {
+            return;
+        }
         SkTBlitterAllocator allocator;
         // blitter will be owned by the allocator.
-        SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, pmap, x, y, &allocator);
+        SkBlitter* blitter = SkBlitter::ChooseSprite(dstPM, paint, pmap, x, y, &allocator);
         if (blitter) {
             SkScan::FillIRect(bounds, *fRC, blitter);
             return;
         }
     }
 
     SkMatrix        matrix;
     SkRect          r;
 
     // get a scalar version of our rect
@@ skipping 914 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }