transform_operations.cc revision 58537e28ecd584eab876aee8be7156509866d23a 
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#include "cc/animation/transform_operations.h"
6
7#include <algorithm>
8
9#include "ui/gfx/box_f.h"
10#include "ui/gfx/transform_util.h"
11#include "ui/gfx/vector3d_f.h"
12
13namespace cc {
14
15TransformOperations::TransformOperations()
16    : decomposed_transform_dirty_(true) {
17}
18
19TransformOperations::TransformOperations(const TransformOperations& other) {
20  operations_ = other.operations_;
21  decomposed_transform_dirty_ = other.decomposed_transform_dirty_;
22  if (!decomposed_transform_dirty_) {
23    decomposed_transform_.reset(
24        new gfx::DecomposedTransform(*other.decomposed_transform_.get()));
25  }
26}
27
28TransformOperations::~TransformOperations() {
29}
30
31gfx::Transform TransformOperations::Apply() const {
32  gfx::Transform to_return;
33  for (size_t i = 0; i < operations_.size(); ++i)
34    to_return.PreconcatTransform(operations_[i].matrix);
35  return to_return;
36}
37
38gfx::Transform TransformOperations::Blend(const TransformOperations& from,
39                                          SkMScalar progress) const {
40  gfx::Transform to_return;
41  BlendInternal(from, progress, &to_return);
42  return to_return;
43}
44
45bool TransformOperations::BlendedBoundsForBox(const gfx::BoxF& box,
46                                              const TransformOperations& from,
47                                              SkMScalar min_progress,
48                                              SkMScalar max_progress,
49                                              gfx::BoxF* bounds) const {
50  *bounds = box;
51
52  bool from_identity = from.IsIdentity();
53  bool to_identity = IsIdentity();
54  if (from_identity && to_identity)
55    return true;
56
57  if (!MatchesTypes(from))
58    return false;
59
60  size_t num_operations =
61      std::max(from_identity ? 0 : from.operations_.size(),
62               to_identity ? 0 : operations_.size());
63  for (size_t i = 0; i < num_operations; ++i) {
64    gfx::BoxF bounds_for_operation;
65    const TransformOperation* from_op =
66        from_identity ? NULL : &from.operations_[i];
67    const TransformOperation* to_op = to_identity ? NULL : &operations_[i];
68    if (!TransformOperation::BlendedBoundsForBox(*bounds,
69                                                 from_op,
70                                                 to_op,
71                                                 min_progress,
72                                                 max_progress,
73                                                 &bounds_for_operation))
74      return false;
75    *bounds = bounds_for_operation;
76  }
77
78  return true;
79}
80
81bool TransformOperations::MatchesTypes(const TransformOperations& other) const {
82  if (IsIdentity() || other.IsIdentity())
83    return true;
84
85  if (operations_.size() != other.operations_.size())
86    return false;
87
88  for (size_t i = 0; i < operations_.size(); ++i) {
89    if (operations_[i].type != other.operations_[i].type
90      && !operations_[i].IsIdentity()
91      && !other.operations_[i].IsIdentity())
92      return false;
93  }
94
95  return true;
96}
97
98bool TransformOperations::CanBlendWith(
99    const TransformOperations& other) const {
100  gfx::Transform dummy;
101  return BlendInternal(other, 0.5, &dummy);
102}
103
104void TransformOperations::AppendTranslate(SkMScalar x,
105                                          SkMScalar y,
106                                          SkMScalar z) {
107  TransformOperation to_add;
108  to_add.matrix.Translate3d(x, y, z);
109  to_add.type = TransformOperation::TransformOperationTranslate;
110  to_add.translate.x = x;
111  to_add.translate.y = y;
112  to_add.translate.z = z;
113  operations_.push_back(to_add);
114  decomposed_transform_dirty_ = true;
115}
116
117void TransformOperations::AppendRotate(SkMScalar x,
118                                       SkMScalar y,
119                                       SkMScalar z,
120                                       SkMScalar degrees) {
121  TransformOperation to_add;
122  to_add.matrix.RotateAbout(gfx::Vector3dF(x, y, z), degrees);
123  to_add.type = TransformOperation::TransformOperationRotate;
124  to_add.rotate.axis.x = x;
125  to_add.rotate.axis.y = y;
126  to_add.rotate.axis.z = z;
127  to_add.rotate.angle = degrees;
128  operations_.push_back(to_add);
129  decomposed_transform_dirty_ = true;
130}
131
132void TransformOperations::AppendScale(SkMScalar x, SkMScalar y, SkMScalar z) {
133  TransformOperation to_add;
134  to_add.matrix.Scale3d(x, y, z);
135  to_add.type = TransformOperation::TransformOperationScale;
136  to_add.scale.x = x;
137  to_add.scale.y = y;
138  to_add.scale.z = z;
139  operations_.push_back(to_add);
140  decomposed_transform_dirty_ = true;
141}
142
143void TransformOperations::AppendSkew(SkMScalar x, SkMScalar y) {
144  TransformOperation to_add;
145  to_add.matrix.SkewX(x);
146  to_add.matrix.SkewY(y);
147  to_add.type = TransformOperation::TransformOperationSkew;
148  to_add.skew.x = x;
149  to_add.skew.y = y;
150  operations_.push_back(to_add);
151  decomposed_transform_dirty_ = true;
152}
153
154void TransformOperations::AppendPerspective(SkMScalar depth) {
155  TransformOperation to_add;
156  to_add.matrix.ApplyPerspectiveDepth(depth);
157  to_add.type = TransformOperation::TransformOperationPerspective;
158  to_add.perspective_depth = depth;
159  operations_.push_back(to_add);
160  decomposed_transform_dirty_ = true;
161}
162
163void TransformOperations::AppendMatrix(const gfx::Transform& matrix) {
164  TransformOperation to_add;
165  to_add.matrix = matrix;
166  to_add.type = TransformOperation::TransformOperationMatrix;
167  operations_.push_back(to_add);
168  decomposed_transform_dirty_ = true;
169}
170
171void TransformOperations::AppendIdentity() {
172  operations_.push_back(TransformOperation());
173}
174
175bool TransformOperations::IsIdentity() const {
176  for (size_t i = 0; i < operations_.size(); ++i) {
177    if (!operations_[i].IsIdentity())
178      return false;
179  }
180  return true;
181}
182
183bool TransformOperations::BlendInternal(const TransformOperations& from,
184                                        SkMScalar progress,
185                                        gfx::Transform* result) const {
186  bool from_identity = from.IsIdentity();
187  bool to_identity = IsIdentity();
188  if (from_identity && to_identity)
189    return true;
190
191  if (MatchesTypes(from)) {
192    size_t num_operations =
193        std::max(from_identity ? 0 : from.operations_.size(),
194                 to_identity ? 0 : operations_.size());
195    for (size_t i = 0; i < num_operations; ++i) {
196      gfx::Transform blended;
197      if (!TransformOperation::BlendTransformOperations(
198          from_identity ? 0 : &from.operations_[i],
199          to_identity ? 0 : &operations_[i],
200          progress,
201          &blended))
202          return false;
203      result->PreconcatTransform(blended);
204    }
205    return true;
206  }
207
208  if (!ComputeDecomposedTransform() || !from.ComputeDecomposedTransform())
209    return false;
210
211  gfx::DecomposedTransform to_return;
212  if (!gfx::BlendDecomposedTransforms(&to_return,
213                                      *decomposed_transform_.get(),
214                                      *from.decomposed_transform_.get(),
215                                      progress))
216    return false;
217
218  *result = ComposeTransform(to_return);
219  return true;
220}
221
222bool TransformOperations::ComputeDecomposedTransform() const {
223  if (decomposed_transform_dirty_) {
224    if (!decomposed_transform_)
225      decomposed_transform_.reset(new gfx::DecomposedTransform());
226    gfx::Transform transform = Apply();
227    if (!gfx::DecomposeTransform(decomposed_transform_.get(), transform))
228      return false;
229    decomposed_transform_dirty_ = false;
230  }
231  return true;
232}
233
234}  // namespace cc
235