cc/animation/transform_operations.cc

   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/animation/tween.h"
  10 #include "ui/gfx/geometry/box_f.h"
  11 #include "ui/gfx/geometry/vector3d_f.h"
  12 #include "ui/gfx/transform_util.h"
  13
  14 namespace cc {
  15
  16 TransformOperations::TransformOperations()
  17     : decomposed_transform_dirty_(true) {
  18 }
  19
  20 TransformOperations::TransformOperations(const TransformOperations& other) {
  21   operations_ = other.operations_;
  22   decomposed_transform_dirty_ = other.decomposed_transform_dirty_;
  23   if (!decomposed_transform_dirty_) {
  24     decomposed_transform_.reset(
  25         new gfx::DecomposedTransform(*other.decomposed_transform_.get()));
  26   }
  27 }
  28
  29 TransformOperations::~TransformOperations() {
  30 }
  31
  32 gfx::Transform TransformOperations::Apply() const {
  33   gfx::Transform to_return;
  34   for (size_t i = 0; i < operations_.size(); ++i)
  35     to_return.PreconcatTransform(operations_[i].matrix);
  36   return to_return;
  37 }
  38
  39 gfx::Transform TransformOperations::Blend(const TransformOperations& from,
  40                                           SkMScalar progress) const {
  41   gfx::Transform to_return;
  42   BlendInternal(from, progress, &to_return);
  43   return to_return;
  44 }
  45
  46 bool TransformOperations::BlendedBoundsForBox(const gfx::BoxF& box,
  47                                               const TransformOperations& from,
  48                                               SkMScalar min_progress,
  49                                               SkMScalar max_progress,
  50                                               gfx::BoxF* bounds) const {
  51   *bounds = box;
  52
  53   bool from_identity = from.IsIdentity();
  54   bool to_identity = IsIdentity();
  55   if (from_identity && to_identity)
  56     return true;
  57
  58   if (!MatchesTypes(from))
  59     return false;
  60
  61   size_t num_operations = std::max(from_identity ? 0 : from.operations_.size(),
  62                                    to_identity ? 0 : operations_.size());
  63
  64   // Because we are squashing all of the matrices together when applying
  65   // them to the animation, we must apply them in reverse order when
  66   // not squashing them.
  67   for (size_t i = 0; i < num_operations; ++i) {
  68     size_t operation_index = num_operations - 1 - i;
  69     gfx::BoxF bounds_for_operation;
  70     const TransformOperation* from_op =
  71         from_identity ? nullptr : &from.operations_[operation_index];
  72     const TransformOperation* to_op =
  73         to_identity ? nullptr : &operations_[operation_index];
  74     if (!TransformOperation::BlendedBoundsForBox(*bounds, from_op, to_op,
  75                                                  min_progress, max_progress,
  76                                                  &bounds_for_operation)) {
  77       return false;
  78     }
  79     *bounds = bounds_for_operation;
  80   }
  81
  82   return true;
  83 }
  84
  85 bool TransformOperations::AffectsScale() const {
  86   for (size_t i = 0; i < operations_.size(); ++i) {
  87     if (operations_[i].type == TransformOperation::TRANSFORM_OPERATION_SCALE)
  88       return true;
  89     if (operations_[i].type == TransformOperation::TRANSFORM_OPERATION_MATRIX &&
  90         !operations_[i].matrix.IsIdentityOrTranslation())
  91       return true;
  92   }
  93   return false;
  94 }
  95
  96 bool TransformOperations::PreservesAxisAlignment() const {
  97   for (size_t i = 0; i < operations_.size(); ++i) {
  98     switch (operations_[i].type) {
  99       case TransformOperation::TRANSFORM_OPERATION_IDENTITY:
 100       case TransformOperation::TRANSFORM_OPERATION_TRANSLATE:
 101       case TransformOperation::TRANSFORM_OPERATION_SCALE:
 102         continue;
 103       case TransformOperation::TRANSFORM_OPERATION_MATRIX:
 104         if (!operations_[i].matrix.IsIdentity() &&
 105             !operations_[i].matrix.IsScaleOrTranslation())
 106           return false;
 107         continue;
 108       case TransformOperation::TRANSFORM_OPERATION_ROTATE:
 109       case TransformOperation::TRANSFORM_OPERATION_SKEW:
 110       case TransformOperation::TRANSFORM_OPERATION_PERSPECTIVE:
 111         return false;
 112     }
 113   }
 114   return true;
 115 }
 116
 117 bool TransformOperations::IsTranslation() const {
 118   for (size_t i = 0; i < operations_.size(); ++i) {
 119     switch (operations_[i].type) {
 120       case TransformOperation::TRANSFORM_OPERATION_IDENTITY:
 121       case TransformOperation::TRANSFORM_OPERATION_TRANSLATE:
 122         continue;
 123       case TransformOperation::TRANSFORM_OPERATION_MATRIX:
 124         if (!operations_[i].matrix.IsIdentityOrTranslation())
 125           return false;
 126         continue;
 127       case TransformOperation::TRANSFORM_OPERATION_ROTATE:
 128       case TransformOperation::TRANSFORM_OPERATION_SCALE:
 129       case TransformOperation::TRANSFORM_OPERATION_SKEW:
 130       case TransformOperation::TRANSFORM_OPERATION_PERSPECTIVE:
 131         return false;
 132     }
 133   }
 134   return true;
 135 }
 136
 137 bool TransformOperations::ScaleComponent(gfx::Vector3dF* scale) const {
 138   *scale = gfx::Vector3dF(1.f, 1.f, 1.f);
 139   bool has_scale_component = false;
 140   for (size_t i = 0; i < operations_.size(); ++i) {
 141     switch (operations_[i].type) {
 142       case TransformOperation::TRANSFORM_OPERATION_IDENTITY:
 143       case TransformOperation::TRANSFORM_OPERATION_TRANSLATE:
 144         continue;
 145       case TransformOperation::TRANSFORM_OPERATION_MATRIX:
 146         if (!operations_[i].matrix.IsIdentityOrTranslation())
 147           return false;
 148         continue;
 149       case TransformOperation::TRANSFORM_OPERATION_ROTATE:
 150       case TransformOperation::TRANSFORM_OPERATION_SKEW:
 151       case TransformOperation::TRANSFORM_OPERATION_PERSPECTIVE:
 152         return false;
 153       case TransformOperation::TRANSFORM_OPERATION_SCALE:
 154         if (has_scale_component)
 155           return false;
 156         has_scale_component = true;
 157         scale->Scale(operations_[i].scale.x,
 158                      operations_[i].scale.y,
 159                      operations_[i].scale.z);
 160     }
 161   }
 162   return true;
 163 }
 164
 165 bool TransformOperations::MatchesTypes(const TransformOperations& other) const {
 166   if (operations_.size() == 0 || other.operations_.size() == 0)
 167     return true;
 168
 169   if (operations_.size() != other.operations_.size())
 170     return false;
 171
 172   for (size_t i = 0; i < operations_.size(); ++i) {
 173     if (operations_[i].type != other.operations_[i].type)
 174       return false;
 175   }
 176
 177   return true;
 178 }
 179
 180 bool TransformOperations::CanBlendWith(
 181     const TransformOperations& other) const {
 182   gfx::Transform dummy;
 183   return BlendInternal(other, 0.5, &dummy);
 184 }
 185
 186 void TransformOperations::AppendTranslate(SkMScalar x,
 187                                           SkMScalar y,
 188                                           SkMScalar z) {
 189   TransformOperation to_add;
 190   to_add.matrix.Translate3d(x, y, z);
 191   to_add.type = TransformOperation::TRANSFORM_OPERATION_TRANSLATE;
 192   to_add.translate.x = x;
 193   to_add.translate.y = y;
 194   to_add.translate.z = z;
 195   operations_.push_back(to_add);
 196   decomposed_transform_dirty_ = true;
 197 }
 198
 199 void TransformOperations::AppendRotate(SkMScalar x,
 200                                        SkMScalar y,
 201                                        SkMScalar z,
 202                                        SkMScalar degrees) {
 203   TransformOperation to_add;
 204   to_add.matrix.RotateAbout(gfx::Vector3dF(x, y, z), degrees);
 205   to_add.type = TransformOperation::TRANSFORM_OPERATION_ROTATE;
 206   to_add.rotate.axis.x = x;
 207   to_add.rotate.axis.y = y;
 208   to_add.rotate.axis.z = z;
 209   to_add.rotate.angle = degrees;
 210   operations_.push_back(to_add);
 211   decomposed_transform_dirty_ = true;
 212 }
 213
 214 void TransformOperations::AppendScale(SkMScalar x, SkMScalar y, SkMScalar z) {
 215   TransformOperation to_add;
 216   to_add.matrix.Scale3d(x, y, z);
 217   to_add.type = TransformOperation::TRANSFORM_OPERATION_SCALE;
 218   to_add.scale.x = x;
 219   to_add.scale.y = y;
 220   to_add.scale.z = z;
 221   operations_.push_back(to_add);
 222   decomposed_transform_dirty_ = true;
 223 }
 224
 225 void TransformOperations::AppendSkew(SkMScalar x, SkMScalar y) {
 226   TransformOperation to_add;
 227   to_add.matrix.SkewX(x);
 228   to_add.matrix.SkewY(y);
 229   to_add.type = TransformOperation::TRANSFORM_OPERATION_SKEW;
 230   to_add.skew.x = x;
 231   to_add.skew.y = y;
 232   operations_.push_back(to_add);
 233   decomposed_transform_dirty_ = true;
 234 }
 235
 236 void TransformOperations::AppendPerspective(SkMScalar depth) {
 237   TransformOperation to_add;
 238   to_add.matrix.ApplyPerspectiveDepth(depth);
 239   to_add.type = TransformOperation::TRANSFORM_OPERATION_PERSPECTIVE;
 240   to_add.perspective_depth = depth;
 241   operations_.push_back(to_add);
 242   decomposed_transform_dirty_ = true;
 243 }
 244
 245 void TransformOperations::AppendMatrix(const gfx::Transform& matrix) {
 246   TransformOperation to_add;
 247   to_add.matrix = matrix;
 248   to_add.type = TransformOperation::TRANSFORM_OPERATION_MATRIX;
 249   operations_.push_back(to_add);
 250   decomposed_transform_dirty_ = true;
 251 }
 252
 253 void TransformOperations::AppendIdentity() {
 254   operations_.push_back(TransformOperation());
 255 }
 256
 257 bool TransformOperations::IsIdentity() const {
 258   for (size_t i = 0; i < operations_.size(); ++i) {
 259     if (!operations_[i].IsIdentity())
 260       return false;
 261   }
 262   return true;
 263 }
 264
 265 bool TransformOperations::BlendInternal(const TransformOperations& from,
 266                                         SkMScalar progress,
 267                                         gfx::Transform* result) const {
 268   bool from_identity = from.IsIdentity();
 269   bool to_identity = IsIdentity();
 270   if (from_identity && to_identity)
 271     return true;
 272
 273   if (MatchesTypes(from)) {
 274     size_t num_operations =
 275         std::max(from_identity ? 0 : from.operations_.size(),
 276                  to_identity ? 0 : operations_.size());
 277     for (size_t i = 0; i < num_operations; ++i) {
 278       gfx::Transform blended;
 279       if (!TransformOperation::BlendTransformOperations(
 280               from.operations_.size() <= i ? 0 : &from.operations_[i],
 281               operations_.size() <= i ? 0 : &operations_[i], progress,
 282               &blended))
 283           return false;
 284       result->PreconcatTransform(blended);
 285     }
 286     return true;
 287   }
 288
 289   if (!ComputeDecomposedTransform() || !from.ComputeDecomposedTransform())
 290     return false;
 291
 292   gfx::DecomposedTransform to_return;
 293   if (!gfx::BlendDecomposedTransforms(&to_return,
 294                                       *decomposed_transform_.get(),
 295                                       *from.decomposed_transform_.get(),
 296                                       progress))
 297     return false;
 298
 299   *result = ComposeTransform(to_return);
 300   return true;
 301 }
 302
 303 bool TransformOperations::ComputeDecomposedTransform() const {
 304   if (decomposed_transform_dirty_) {
 305     if (!decomposed_transform_)
 306       decomposed_transform_.reset(new gfx::DecomposedTransform());
 307     gfx::Transform transform = Apply();
 308     if (!gfx::DecomposeTransform(decomposed_transform_.get(), transform))
 309       return false;
 310     decomposed_transform_dirty_ = false;
 311   }
 312   return true;
 313 }
 314
 315 }  // namespace cc