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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_ANIMATION_TRANSFORM_OPERATION_H_
      6 #define CC_ANIMATION_TRANSFORM_OPERATION_H_
      7 
      8 #include "ui/gfx/transform.h"
      9 
     10 namespace cc {
     11 
     12 struct TransformOperation {
     13   enum Type {
     14     TransformOperationTranslate,
     15     TransformOperationRotate,
     16     TransformOperationScale,
     17     TransformOperationSkew,
     18     TransformOperationPerspective,
     19     TransformOperationMatrix,
     20     TransformOperationIdentity
     21   };
     22 
     23   TransformOperation()
     24       : type(TransformOperationIdentity) {
     25   }
     26 
     27   Type type;
     28   gfx::Transform matrix;
     29 
     30   union {
     31     double perspective_depth;
     32 
     33     struct {
     34       double x, y;
     35     } skew;
     36 
     37     struct {
     38       double x, y, z;
     39     } scale;
     40 
     41     struct {
     42       double x, y, z;
     43     } translate;
     44 
     45     struct {
     46       struct {
     47         double x, y, z;
     48       } axis;
     49 
     50       double angle;
     51     } rotate;
     52   };
     53 
     54   bool IsIdentity() const;
     55   static bool BlendTransformOperations(const TransformOperation* from,
     56                                        const TransformOperation* to,
     57                                        double progress,
     58                                        gfx::Transform* result);
     59 };
     60 
     61 }  // namespace cc
     62 
     63 #endif  // CC_ANIMATION_TRANSFORM_OPERATION_H_
     64