text: // 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_OPERATIONS_H_
  #define CC_OUTPUT_FILTER_OPERATIONS_H_
  
  #include <vector>
  
  #include "base/logging.h"
  #include "base/memory/scoped_ptr.h"
  #include "cc/output/filter_operation.h"
  
  namespace base {
  class Value;
  }
  
  namespace cc {
  
  // An ordered list of filter operations.
  class CC_EXPORT FilterOperations {
   public:
    FilterOperations();
  
    FilterOperations(const FilterOperations& other);
  
    ~FilterOperations();
  
    FilterOperations& operator=(const FilterOperations& other);
  
    bool operator==(const FilterOperations& other) const;
  
    bool operator!=(const FilterOperations& other) const {
      return !(*this == other);
    }
  
    void Append(const FilterOperation& filter);
  
    // Removes all filter operations.
    void Clear();
  
    bool IsEmpty() const;
  
    void GetOutsets(int* top, int* right, int* bottom, int* left) const;
    bool HasFilterThatMovesPixels() const;
    bool HasFilterThatAffectsOpacity() const;
    bool HasReferenceFilter() const;
  
    size_t size() const {
      return operations_.size();
    }
  
    const FilterOperation& at(size_t index) const {
      DCHECK_LT(index, size());
      return operations_[index];
    }
  
    // If |from| is of the same size as this, where in each position, the filter
    // in |from| is of the same type as the filter in this, and if this doesn't
    // contain any reference filters, returns a FilterOperations formed by
    // linearly interpolating at each position a |progress| fraction of the way
    // from the filter in |from| to the filter in this. If |from| and this are of
    // different lengths, they are treated as having the same length by padding
    // the shorter sequence with no-op filters of the same type as the filters in
    // the corresponding positions in the longer sequence. If either sequence has
    // a reference filter or if there is a type mismatch at some position, returns
    // a copy of this.
    FilterOperations Blend(const FilterOperations& from, double progress) const;
  
  
    scoped_ptr<base::Value> AsValue() const;
  
   private:
    std::vector<FilterOperation> operations_;
  };
  
  }  // namespace cc
  
  #endif  // CC_OUTPUT_FILTER_OPERATIONS_H_
  