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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 <stddef.h>
#include <vector>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "cc/output/filter_operation.h"
namespace base {
namespace trace_event {
class TracedValue;
}
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;
void AsValueInto(base::trace_event::TracedValue* value) const;
private:
std::vector<FilterOperation> operations_;
};
} // namespace cc
#endif // CC_OUTPUT_FILTER_OPERATIONS_H_
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