free cache in destructor, in case endContext was not called. change Resize to return bool indicatin…

src/core/SkBitmapScaler.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapScaler_DEFINED
 #define SkBitmapScaler_DEFINED
 
@@ skipping 69 matching lines @@
     };
 
     // Resizes the given source bitmap using the specified resize method, so that
     // the entire image is (dest_size) big. The dest_subset is the rectangle in
     // this destination image that should actually be returned.
     //
     // The output image will be (dest_subset.width(), dest_subset.height()). This
     // will save work if you do not need the entire bitmap.
     //
     // The destination subset must be smaller than the destination image.
-    static SkBitmap Resize(const SkBitmap& source,
-                           ResizeMethod method,
-                           int dest_width, int dest_height,
-                           const SkIRect& dest_subset,
-                           SkConvolutionProcs *convolveProcs = NULL,
-                           SkBitmap::Allocator* allocator = NULL);
+    static bool Resize(SkBitmap* result,
+                       const SkBitmap& source,
+                       ResizeMethod method,
+                       int dest_width, int dest_height,
+                       const SkIRect& dest_subset,
+                       SkConvolutionProcs *convolveProcs = NULL,
+                       SkBitmap::Allocator* allocator = NULL);
 
     // Alternate version for resizing and returning the entire bitmap rather than
     // a subset.
-    static SkBitmap Resize(const SkBitmap& source,
-                           ResizeMethod method,
-                           int dest_width, int dest_height,
-                           SkConvolutionProcs *convolveProcs = NULL,
-                           SkBitmap::Allocator* allocator = NULL);
+    static bool Resize(SkBitmap* result,
+                       const SkBitmap& source,
+                       ResizeMethod method,
+                       int dest_width, int dest_height,
+                       SkConvolutionProcs *convolveProcs = NULL,
+                       SkBitmap::Allocator* allocator = NULL);
 };
 
 #endif