Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/gl_renderer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 740 matching lines @@
 
     if (disable_blending)
       SetBlendEnabled(true);
   }
 
   // TODO(senorblanco): Cache this value so that we don't have to do it for both
   // the surface and its replica.  Apply filters to the contents texture.
   SkBitmap filter_bitmap;
   SkScalar color_matrix[20];
   bool use_color_matrix = false;
-  if (quad->filter) {
+  // TODO(ajuma): Always use RenderSurfaceFilters::BuildImageFilter, not just
+  // when we have a reference filter.

[ajuma, 2013/09/09 17:35:36]

I'm leaving this for a separate CL in order to avoid introducing behavior
changes (the ApplyImageFilter path can produce slightly different results than
the ApplyFilters path) in this already-large CL.

+  if (quad->filters.HasReferenceFilter()) {
+    skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
+        quad->filters, contents_texture->size());
     skia::RefPtr<SkColorFilter> cf;
 
     {
       SkColorFilter* colorfilter_rawptr = NULL;
-      quad->filter->asColorFilter(&colorfilter_rawptr);
+      filter->asColorFilter(&colorfilter_rawptr);
       cf = skia::AdoptRef(colorfilter_rawptr);
     }
 
-    if (cf && cf->asColorMatrix(color_matrix) && !quad->filter->getInput(0)) {
+    if (cf && cf->asColorMatrix(color_matrix) && !filter->getInput(0)) {
       // We have a single color matrix as a filter; apply it locally
       // in the compositor.
       use_color_matrix = true;
     } else {
       filter_bitmap = ApplyImageFilter(this,
                                        frame->offscreen_context_provider,
                                        quad->rect.origin(),
-                                       quad->filter.get(),
+                                       filter.get(),
                                        contents_texture);
     }
   } else if (!quad->filters.IsEmpty()) {
     FilterOperations optimized_filters =
         RenderSurfaceFilters::Optimize(quad->filters);
 
     if ((optimized_filters.size() == 1) &&
         (optimized_filters.at(0).type() == FilterOperation::COLOR_MATRIX)) {
       memcpy(
           color_matrix, optimized_filters.at(0).matrix(), sizeof(color_matrix));
@@ skipping 2361 matching lines @@
   std::string unique_context_name = base::StringPrintf(
       "%s-Offscreen-%p",
       Settings().compositor_name.c_str(),
       context_);
   offscreen_context_provider->Context3d()->pushGroupMarkerEXT(
       unique_context_name.c_str());
 }
 
 
 }  // namespace cc