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// 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;
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, 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 either |from| or this is an empty sequence,
// it is treated as a sequence of the same length as the other sequence,
// where the filter at each position is a no-op filter of the same type
// as the filter in that position in the other sequence. Otherwise, if
// both |from| and this are non-empty sequences but are either of different
// lengths 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_
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