Do not playback existing commands for full deferred canvas writePixels

src/utils/SkDeferredCanvas.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDeferredCanvas.h"
 
@@ skipping 427 matching lines @@
 
     fImmediateCanvas->flush();
 }
 
 bool SkDeferredDevice::onWritePixels(const SkImageInfo& info, const void* pixels, size_t rowBytes,
                                    int x, int y) {
     SkASSERT(x >= 0 && y >= 0);
     SkASSERT(x + info.width() <= width());
     SkASSERT(y + info.height() <= height());
 
-    this->flushPendingCommands(kNormal_PlaybackMode);
-
     const SkImageInfo deviceInfo = this->imageInfo();
     if (info.width() == deviceInfo.width() && info.height() == deviceInfo.height()) {
         this->skipPendingCommands();
+    } else {
+        this->flushPendingCommands(kNormal_PlaybackMode);
     }
 
     this->prepareForImmediatePixelWrite();
     return immediateDevice()->onWritePixels(info, pixels, rowBytes, x, y);
 }
 
 const SkBitmap& SkDeferredDevice::onAccessBitmap() {
     this->flushPendingCommands(kNormal_PlaybackMode);
     return immediateDevice()->accessBitmap(false);
 }
@@ skipping 471 matching lines @@
 SkDrawFilter* SkDeferredCanvas::setDrawFilter(SkDrawFilter* filter) {
     this->drawingCanvas()->setDrawFilter(filter);
     this->INHERITED::setDrawFilter(filter);
     this->recordedDrawCommand();
     return filter;
 }
 
 SkCanvas* SkDeferredCanvas::canvasForDrawIter() {
     return this->drawingCanvas();
 }