Disable layer hoisting for non-8888 canvases

src/core/SkMultiPictureDraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // Need to include something before #if SK_SUPPORT_GPU so that the Android
 // framework build, which gets its defines from SkTypes rather than a makefile,
 // has the definition before checking it.
@@ skipping 106 matching lines @@
     // drawing the canvas that requires them.
     SkTDArray<GrHoistedLayer> atlasedNeedRendering, atlasedRecycled;
 
     GrLayerHoister::Begin(context);
 
     for (int i = 0; i < count; ++i) {
         const DrawData& data = fGPUDrawData[i];
         // we only expect 1 context for all the canvases
         SkASSERT(data.fCanvas->getGrContext() == context);
 
-        if (!data.fPaint) {
+        if (!data.fPaint && 
+            (kRGBA_8888_SkColorType == data.fCanvas->imageInfo().colorType() ||
+             kBGRA_8888_SkColorType == data.fCanvas->imageInfo().colorType())) {
             SkRect clipBounds;
             if (!data.fCanvas->getClipBounds(&clipBounds)) {
                 continue;
             }
 
             SkMatrix initialMatrix = data.fCanvas->getTotalMatrix();
             initialMatrix.preConcat(data.fMatrix);
 
             GrDrawContext* dc = data.fCanvas->internal_private_accessTopLayerDrawContext();
             SkASSERT(dc);
@@ skipping 60 matching lines @@
             canvas->flush();
         }
     }
 
 #if !defined(SK_IGNORE_GPU_LAYER_HOISTING) && SK_SUPPORT_GPU
     GrLayerHoister::UnlockLayers(context, atlasedNeedRendering);
     GrLayerHoister::UnlockLayers(context, atlasedRecycled);
     GrLayerHoister::End(context);
 #endif
 }