Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/filter_operations.cc

 // Copyright 2013 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 <cmath>
 
 #include "cc/output/filter_operations.h"
 
 #include "base/values.h"
 #include "cc/output/filter_operation.h"
@@ skipping 62 matching lines @@
         *right += spread + op.drop_shadow_offset().x();
         *bottom += spread + op.drop_shadow_offset().y();
         *left += spread - op.drop_shadow_offset().x();
       }
     }
   }
 }
 
 bool FilterOperations::HasFilterThatMovesPixels() const {
   for (size_t i = 0; i < operations_.size(); ++i) {
     const FilterOperation op = operations_[i];

[danakj, 2013/09/09 22:04:50]

hmm, I think we meant const& here btw..

[ajuma, 2013/09/10 21:17:58]

Done.

     switch (op.type()) {
       case FilterOperation::BLUR:
       case FilterOperation::DROP_SHADOW:
       case FilterOperation::ZOOM:
+      case FilterOperation::REFERENCE:

[danakj, 2013/09/09 22:04:50]

Should we DCHECK() that this is not called with REFERENCE since the outsets will
be invalid?

[ajuma, 2013/09/10 21:17:58]

Done. Also added a DCHECK to GetOutsets for the same reason.

         return true;
       case FilterOperation::OPACITY:
       case FilterOperation::COLOR_MATRIX:
       case FilterOperation::GRAYSCALE:
       case FilterOperation::SEPIA:
       case FilterOperation::SATURATE:
       case FilterOperation::HUE_ROTATE:
       case FilterOperation::INVERT:
       case FilterOperation::BRIGHTNESS:
       case FilterOperation::CONTRAST:
       case FilterOperation::SATURATING_BRIGHTNESS:
         break;
     }
   }
   return false;
 }
 
 bool FilterOperations::HasFilterThatAffectsOpacity() const {
   for (size_t i = 0; i < operations_.size(); ++i) {
     const FilterOperation op = operations_[i];

[danakj, 2013/09/09 22:04:50]

hmm, I think we meant const& here btw..

[ajuma, 2013/09/10 21:17:58]

Done.

     switch (op.type()) {
       case FilterOperation::OPACITY:
       case FilterOperation::BLUR:
       case FilterOperation::DROP_SHADOW:
       case FilterOperation::ZOOM:
+      case FilterOperation::REFERENCE:
         return true;
       case FilterOperation::COLOR_MATRIX: {
         const SkScalar* matrix = op.matrix();
         if (matrix[15] ||
             matrix[16] ||
             matrix[17] ||
             matrix[18] != 1 ||
             matrix[19])
           return true;
         break;
       }
       case FilterOperation::GRAYSCALE:
       case FilterOperation::SEPIA:
       case FilterOperation::SATURATE:
       case FilterOperation::HUE_ROTATE:
       case FilterOperation::INVERT:
       case FilterOperation::BRIGHTNESS:
       case FilterOperation::CONTRAST:
       case FilterOperation::SATURATING_BRIGHTNESS:
         break;
     }
   }
   return false;
 }
 
+bool FilterOperations::HasReferenceFilter() const {
+  for (size_t i = 0; i < operations_.size(); ++i) {
+    if (operations_[i].type() == FilterOperation::REFERENCE)
+      return true;
+  }
+  return false;
+}
+
 FilterOperations FilterOperations::Blend(const FilterOperations& from,
                                          double progress) const {
   FilterOperations blended_filters;
   if (from.size() == 0) {
     for (size_t i = 0; i < size(); i++)
       blended_filters.Append(FilterOperation::Blend(NULL, &at(i), progress));
     return blended_filters;
   }
 
   if (size() == 0) {
@@ skipping 21 matching lines @@
 }
 
 scoped_ptr<base::Value> FilterOperations::AsValue() const {
   scoped_ptr<base::ListValue> value(new ListValue);
   for (size_t i = 0; i < operations_.size(); ++i)
     value->Append(operations_[i].AsValue().release());
   return value.PassAs<base::Value>();
 }
 
 }  // namespace cc