Add support for converting cc::FilterOperations into an SkImageFilter

cc/output/filter_operation.h

 // 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.
 
 #ifndef CC_OUTPUT_FILTER_OPERATION_H_
 #define CC_OUTPUT_FILTER_OPERATION_H_
 
 #include "base/logging.h"
 #include "cc/base/cc_export.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/core/SkScalar.h"
 #include "ui/gfx/point.h"
 
 namespace cc {
 
 class CC_EXPORT FilterOperation {
  public:
   enum FilterType {
     GRAYSCALE,
     SEPIA,
     SATURATE,
     HUE_ROTATE,
     INVERT,
     BRIGHTNESS,
     CONTRAST,
     OPACITY,
     BLUR,
     DROP_SHADOW,
     COLOR_MATRIX,
     ZOOM,
+    REFERENCE,
     SATURATING_BRIGHTNESS,  // Not used in CSS/SVG.
   };
 
+  FilterOperation(const FilterOperation& other);
+
+  ~FilterOperation();
+
   FilterType type() const { return type_; }
 
   float amount() const {
     DCHECK_NE(type_, COLOR_MATRIX);
+    DCHECK_NE(type_, REFERENCE);
     return amount_;
   }
 
   gfx::Point drop_shadow_offset() const {
     DCHECK_EQ(type_, DROP_SHADOW);
     return drop_shadow_offset_;
   }
 
   SkColor drop_shadow_color() const {
     DCHECK_EQ(type_, DROP_SHADOW);
     return drop_shadow_color_;
   }
 
+  skia::RefPtr<SkImageFilter> image_filter() const {
+    DCHECK_EQ(type_, REFERENCE);
+    return image_filter_;
+  }
+
   const SkScalar* matrix() const {
     DCHECK_EQ(type_, COLOR_MATRIX);
     return matrix_;
   }
 
   int zoom_inset() const {
     DCHECK_EQ(type_, ZOOM);
     return zoom_inset_;
   }
 
@@ skipping 40 matching lines @@
   }
 
   static FilterOperation CreateColorMatrixFilter(SkScalar matrix[20]) {
     return FilterOperation(COLOR_MATRIX, matrix);
   }
 
   static FilterOperation CreateZoomFilter(float amount, int inset) {
     return FilterOperation(ZOOM, amount, inset);
   }
 
+  static FilterOperation CreateReferenceFilter(
+      const skia::RefPtr<SkImageFilter> image_filter) {
+    return FilterOperation(REFERENCE, image_filter);
+  }
+
   static FilterOperation CreateSaturatingBrightnessFilter(float amount) {
     return FilterOperation(SATURATING_BRIGHTNESS, amount);
   }
 
   bool operator==(const FilterOperation& other) const;
 
   bool operator!=(const FilterOperation& other) const {
     return !(*this == other);
   }
 
   // Methods for restoring a FilterOperation.
   static FilterOperation CreateEmptyFilter() {
     return FilterOperation(GRAYSCALE, 0.f);
   }
 
   void set_type(FilterType type) { type_ = type; }
 
   void set_amount(float amount) {
     DCHECK_NE(type_, COLOR_MATRIX);
+    DCHECK_NE(type_, REFERENCE);
     amount_ = amount;
   }
 
   void set_drop_shadow_offset(gfx::Point offset) {
     DCHECK_EQ(type_, DROP_SHADOW);
     drop_shadow_offset_ = offset;
   }
 
   void set_drop_shadow_color(SkColor color) {
     DCHECK_EQ(type_, DROP_SHADOW);
     drop_shadow_color_ = color;
   }
 
+  void set_image_filter(const skia::RefPtr<SkImageFilter>& image_filter) {
+    DCHECK_EQ(type_, REFERENCE);
+    image_filter_ = image_filter;
+  }
+
   void set_matrix(const SkScalar matrix[20]) {
     DCHECK_EQ(type_, COLOR_MATRIX);
     for (unsigned i = 0; i < 20; ++i)
       matrix_[i] = matrix[i];
   }
 
   void set_zoom_inset(int inset) {
     DCHECK_EQ(type_, ZOOM);
     zoom_inset_ = inset;
   }
@@ skipping 13 matching lines @@
 
   FilterOperation(FilterType type,
                   gfx::Point offset,
                   float stdDeviation,
                   SkColor color);
 
   FilterOperation(FilterType, SkScalar matrix[20]);
 
   FilterOperation(FilterType type, float amount, int inset);
 
+  FilterOperation(FilterType type,
+                  const skia::RefPtr<SkImageFilter>& image_filter);
+
   FilterType type_;
   float amount_;
   gfx::Point drop_shadow_offset_;
   SkColor drop_shadow_color_;
+  skia::RefPtr<SkImageFilter> image_filter_;
   SkScalar matrix_[20];
   int zoom_inset_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_FILTER_OPERATION_H_