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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_TRANSFORM_OPERATIONS_H_
#define CC_TRANSFORM_OPERATIONS_H_
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "cc/cc_export.h"
#include "cc/transform_operation.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebTransformationMatrix.h"
namespace cc {
// Transform operations are a decomposed transformation matrix. It can be
// applied to obtain a WebTransformationMatrix at any time, and can be blended
// intelligently with other transform operations, so long as they represent the
// same decomposition. For example, if we have a transform that is made up of
// a rotation followed by skew, it can be blended intelligently with another
// transform made up of a rotation followed by a skew. Blending is possible if
// we have two dissimilar sets of transform operations, but the effect may not
// be what was intended. For more information, see the comments for the blend
// function below.
class CC_EXPORT TransformOperations {
public:
TransformOperations();
TransformOperations(const TransformOperations& other);
~TransformOperations();
// Returns a transformation matrix representing these transform operations.
WebKit::WebTransformationMatrix Apply() const;
// Given another set of transform operations and a progress in the range
// [0, 1], returns a transformation matrix representing the intermediate
// value. If this->MatchesTypes(from), then each of the operations are
// blended separately and then combined. Otherwise, the two sets of
// transforms are baked to matrices (using apply), and the matrices are
// then decomposed and interpolated. For more information, see
// http://www.w3.org/TR/2011/WD-css3-2d-transforms-20111215/#matrix-decomposition.
WebKit::WebTransformationMatrix Blend(
const TransformOperations& from, double progress) const;
// Returns true if this operation and its descendants have the same types
// as other and its descendants.
bool MatchesTypes(const TransformOperations& other) const;
// Returns true if these operations can be blended. It will only return
// false if we must resort to matrix interpolation, and matrix interpolation
// fails (this can happen if either matrix cannot be decomposed).
bool CanBlendWith(const TransformOperations& other) const;
void AppendTranslate(double x, double y, double z);
void AppendRotate(double x, double y, double z, double degrees);
void AppendScale(double x, double y, double z);
void AppendSkew(double x, double y);
void AppendPerspective(double depth);
void AppendMatrix(const WebKit::WebTransformationMatrix& matrix);
void AppendIdentity();
bool IsIdentity() const;
private:
bool BlendInternal(const TransformOperations& from, double progress,
WebKit::WebTransformationMatrix& result) const;
std::vector<TransformOperation> operations_;
};
} // namespace cc
#endif // CC_TRANSFORM_OPERATIONS_H_
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