Add override to force bitmap rendering

src/gpu/GrSWMaskHelper.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSWMaskHelper_DEFINED
 #define GrSWMaskHelper_DEFINED
 
@@ skipping 31 matching lines @@
 class GrSWMaskHelper : SkNoncopyable {
 public:
     GrSWMaskHelper(GrContext* context)
     : fContext(context)
     , fCompressionMode(kNone_CompressionMode) {
     }
 
     // set up the internal state in preparation for draws. Since many masks
     // may be accumulated in the helper during creation, "resultBounds"
     // allows the caller to specify the region of interest - to limit the
-    // amount of work.
-    bool init(const SkIRect& resultBounds, const SkMatrix* matrix);
+    // amount of work. allowCompression should be set to false if you plan on using
+    // your own texture to draw into, and not a scratch texture via getTexture().
+    bool init(const SkIRect& resultBounds, const SkMatrix* matrix, bool allowCompression = true);
 
     // Draw a single rect into the accumulation bitmap using the specified op
     void draw(const SkRect& rect, SkRegion::Op op,
               bool antiAlias, uint8_t alpha);
 
     // Draw a single path into the accumuation bitmap using the specified op
     void draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
               bool antiAlias, uint8_t alpha);
 
     // Helper function to get a scratch texture suitable for capturing the
@@ skipping 62 matching lines @@
                          const void *data, int rowbytes);
 
     // Compresses the bitmap stored in fBM and sends the compressed data
     // to the GPU to be stored in 'texture' using sendTextureData.
     void compressTextureData(GrTexture *texture, const GrTextureDesc& desc);
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif // GrSWMaskHelper_DEFINED