Implement intra-frame cacheing in image filters.

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrBicubicEffect.h"
@@ skipping 1518 matching lines @@
 
     SkImageFilter* filter = paint.getImageFilter();
     // This bitmap will own the filtered result as a texture.
     SkBitmap filteredBitmap;
 
     if (NULL != filter) {
         SkIPoint offset = SkIPoint::Make(0, 0);
         SkMatrix matrix(*draw.fMatrix);
         matrix.postTranslate(SkIntToScalar(-left), SkIntToScalar(-top));
         SkIRect clipBounds = SkIRect::MakeWH(bitmap.width(), bitmap.height());
-        SkImageFilter::Context ctx(matrix, clipBounds);
+        SkImageFilter::Cache* cache = SkImageFilter::Cache::Create();
+        SkAutoUnref aur(cache);
+        SkImageFilter::Context ctx(matrix, clipBounds, cache);
         if (filter_texture(this, fContext, texture, filter, w, h, ctx, &filteredBitmap,
                            &offset)) {
             texture = (GrTexture*) filteredBitmap.getTexture();
             w = filteredBitmap.width();
             h = filteredBitmap.height();
             left += offset.x();
             top += offset.y();
         } else {
             return;
         }
@@ skipping 87 matching lines @@
 
     SkImageFilter* filter = paint.getImageFilter();
     // This bitmap will own the filtered result as a texture.
     SkBitmap filteredBitmap;
 
     if (NULL != filter) {
         SkIPoint offset = SkIPoint::Make(0, 0);
         SkMatrix matrix(*draw.fMatrix);
         matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
         SkIRect clipBounds = SkIRect::MakeWH(devTex->width(), devTex->height());
-        SkImageFilter::Context ctx(matrix, clipBounds);
+        SkImageFilter::Cache* cache = SkImageFilter::Cache::Create();
+        SkAutoUnref aur(cache);
+        SkImageFilter::Context ctx(matrix, clipBounds, cache);
         if (filter_texture(this, fContext, devTex, filter, w, h, ctx, &filteredBitmap,
                            &offset)) {
             devTex = filteredBitmap.getTexture();
             w = filteredBitmap.width();
             h = filteredBitmap.height();
             x += offset.fX;
             y += offset.fY;
         } else {
             return;
         }
@@ skipping 333 matching lines @@
             const GrAtlasedLayer* layer = fContext->getLayerCache()->findLayerOrCreate(picture, i);
 
             SkDebugf("%d (%d), ", i, layer->layerID());
         }
     }
     SkDebugf("\n");
 #endif
 
     return false;
 }