Add GrLayerCache::writeLayersToDisk

src/gpu/GrLayerCache.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.
  */
 
 #include "GrAtlas.h"
 #include "GrGpu.h"
 #include "GrLayerCache.h"
+#include "GrSurfacePriv.h"
 
 DECLARE_SKMESSAGEBUS_MESSAGE(GrPictureDeletedMessage);
 
 #ifdef SK_DEBUG
 void GrCachedLayer::validate(const GrTexture* backingTexture) const {
     SkASSERT(SK_InvalidGenID != fKey.pictureID());
     SkASSERT(fKey.start() >= 0);
 
     if (fTexture) {
         // If the layer is in some texture then it must occupy some rectangle
@@ skipping 406 matching lines @@
 
 void GrLayerCache::processDeletedPictures() {
     SkTDArray<GrPictureDeletedMessage> deletedPictures;
     fPictDeletionInbox.poll(&deletedPictures);
 
     for (int i = 0; i < deletedPictures.count(); i++) {
         this->purge(deletedPictures[i].pictureID);
     }
 }
 
+#ifdef SK_DEVELOPER
+void GrLayerCache::writeLayersToDisk(const SkString& dirName) {
+
+    GrTexture* atlasTexture = fAtlas->getTexture();
+    if (NULL != atlasTexture) {
+        SkString fileName(dirName);
+        fileName.append("\\atlas.png");
+
+        atlasTexture->surfacePriv().savePixels(fileName.c_str());
+    }
+
+    SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
+    for (; !iter.done(); ++iter) {
+        GrCachedLayer* layer = &(*iter);
+
+        if (layer->isAtlased() || !layer->texture()) {
+            continue;
+        }
+
+        SkString fileName(dirName);
+        fileName.append("\\");
+        fileName.appendU32(layer->fKey.pictureID());
+        fileName.append("-");
+        fileName.appendU32(layer->fKey.start());
+        fileName.append(".png");
+
+        layer->texture()->surfacePriv().savePixels(fileName.c_str());
+    }
+}
+#endif