src/cc/animation/keyframed_animation_curve.cc

   1 // Copyright 2012 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/keyframed_animation_curve.h"
   6 #include "ui/gfx/animation/tween.h"
   7 #include "ui/gfx/box_f.h"
   8
   9 namespace cc {
  10
  11 namespace {
  12
  13 template <class Keyframe>
  14 void InsertKeyframe(scoped_ptr<Keyframe> keyframe,
  15                     ScopedPtrVector<Keyframe>& keyframes) {
  16   // Usually, the keyframes will be added in order, so this loop would be
  17   // unnecessary and we should skip it if possible.
  18   if (!keyframes.empty() && keyframe->Time() < keyframes.back()->Time()) {
  19     for (size_t i = 0; i < keyframes.size(); ++i) {
  20       if (keyframe->Time() < keyframes[i]->Time()) {
  21         keyframes.insert(keyframes.begin() + i, keyframe.Pass());
  22         return;
  23       }
  24     }
  25   }
  26
  27   keyframes.push_back(keyframe.Pass());
  28 }
  29
  30 template <class Keyframes>
  31 float GetProgress(double t, size_t i, const Keyframes& keyframes) {
  32   float progress =
  33       static_cast<float>((t - keyframes[i]->Time()) /
  34                          (keyframes[i + 1]->Time() - keyframes[i]->Time()));
  35
  36   if (keyframes[i]->timing_function())
  37     progress = keyframes[i]->timing_function()->GetValue(progress);
  38   return progress;
  39 }
  40
  41 scoped_ptr<TimingFunction> CloneTimingFunction(
  42     const TimingFunction* timing_function) {
  43   DCHECK(timing_function);
  44   scoped_ptr<AnimationCurve> curve(timing_function->Clone());
  45   return scoped_ptr<TimingFunction>(
  46       static_cast<TimingFunction*>(curve.release()));
  47 }
  48
  49 }  // namespace
  50
  51 Keyframe::Keyframe(double time, scoped_ptr<TimingFunction> timing_function)
  52     : time_(time),
  53       timing_function_(timing_function.Pass()) {}
  54
  55 Keyframe::~Keyframe() {}
  56
  57 double Keyframe::Time() const {
  58   return time_;
  59 }
  60
  61 scoped_ptr<ColorKeyframe> ColorKeyframe::Create(
  62     double time,
  63     SkColor value,
  64     scoped_ptr<TimingFunction> timing_function) {
  65   return make_scoped_ptr(
  66       new ColorKeyframe(time, value, timing_function.Pass()));
  67 }
  68
  69 ColorKeyframe::ColorKeyframe(double time,
  70                              SkColor value,
  71                              scoped_ptr<TimingFunction> timing_function)
  72     : Keyframe(time, timing_function.Pass()),
  73       value_(value) {}
  74
  75 ColorKeyframe::~ColorKeyframe() {}
  76
  77 SkColor ColorKeyframe::Value() const { return value_; }
  78
  79 scoped_ptr<ColorKeyframe> ColorKeyframe::Clone() const {
  80   scoped_ptr<TimingFunction> func;
  81   if (timing_function())
  82     func = CloneTimingFunction(timing_function());
  83   return ColorKeyframe::Create(Time(), Value(), func.Pass());
  84 }
  85
  86 scoped_ptr<FloatKeyframe> FloatKeyframe::Create(
  87     double time,
  88     float value,
  89     scoped_ptr<TimingFunction> timing_function) {
  90   return make_scoped_ptr(
  91       new FloatKeyframe(time, value, timing_function.Pass()));
  92 }
  93
  94 FloatKeyframe::FloatKeyframe(double time,
  95                              float value,
  96                              scoped_ptr<TimingFunction> timing_function)
  97     : Keyframe(time, timing_function.Pass()),
  98       value_(value) {}
  99
 100 FloatKeyframe::~FloatKeyframe() {}
 101
 102 float FloatKeyframe::Value() const {
 103   return value_;
 104 }
 105
 106 scoped_ptr<FloatKeyframe> FloatKeyframe::Clone() const {
 107   scoped_ptr<TimingFunction> func;
 108   if (timing_function())
 109     func = CloneTimingFunction(timing_function());
 110   return FloatKeyframe::Create(Time(), Value(), func.Pass());
 111 }
 112
 113 scoped_ptr<TransformKeyframe> TransformKeyframe::Create(
 114     double time,
 115     const TransformOperations& value,
 116     scoped_ptr<TimingFunction> timing_function) {
 117   return make_scoped_ptr(
 118       new TransformKeyframe(time, value, timing_function.Pass()));
 119 }
 120
 121 TransformKeyframe::TransformKeyframe(double time,
 122                                      const TransformOperations& value,
 123                                      scoped_ptr<TimingFunction> timing_function)
 124     : Keyframe(time, timing_function.Pass()),
 125       value_(value) {}
 126
 127 TransformKeyframe::~TransformKeyframe() {}
 128
 129 const TransformOperations& TransformKeyframe::Value() const {
 130   return value_;
 131 }
 132
 133 scoped_ptr<TransformKeyframe> TransformKeyframe::Clone() const {
 134   scoped_ptr<TimingFunction> func;
 135   if (timing_function())
 136     func = CloneTimingFunction(timing_function());
 137   return TransformKeyframe::Create(Time(), Value(), func.Pass());
 138 }
 139
 140 scoped_ptr<FilterKeyframe> FilterKeyframe::Create(
 141     double time,
 142     const FilterOperations& value,
 143     scoped_ptr<TimingFunction> timing_function) {
 144   return make_scoped_ptr(
 145       new FilterKeyframe(time, value, timing_function.Pass()));
 146 }
 147
 148 FilterKeyframe::FilterKeyframe(double time,
 149                                const FilterOperations& value,
 150                                scoped_ptr<TimingFunction> timing_function)
 151     : Keyframe(time, timing_function.Pass()),
 152       value_(value) {}
 153
 154 FilterKeyframe::~FilterKeyframe() {}
 155
 156 const FilterOperations& FilterKeyframe::Value() const {
 157   return value_;
 158 }
 159
 160 scoped_ptr<FilterKeyframe> FilterKeyframe::Clone() const {
 161   scoped_ptr<TimingFunction> func;
 162   if (timing_function())
 163     func = CloneTimingFunction(timing_function());
 164   return FilterKeyframe::Create(Time(), Value(), func.Pass());
 165 }
 166
 167 scoped_ptr<KeyframedColorAnimationCurve> KeyframedColorAnimationCurve::
 168     Create() {
 169   return make_scoped_ptr(new KeyframedColorAnimationCurve);
 170 }
 171
 172 KeyframedColorAnimationCurve::KeyframedColorAnimationCurve() {}
 173
 174 KeyframedColorAnimationCurve::~KeyframedColorAnimationCurve() {}
 175
 176 void KeyframedColorAnimationCurve::AddKeyframe(
 177     scoped_ptr<ColorKeyframe> keyframe) {
 178   InsertKeyframe(keyframe.Pass(), keyframes_);
 179 }
 180
 181 double KeyframedColorAnimationCurve::Duration() const {
 182   return keyframes_.back()->Time() - keyframes_.front()->Time();
 183 }
 184
 185 scoped_ptr<AnimationCurve> KeyframedColorAnimationCurve::Clone() const {
 186   scoped_ptr<KeyframedColorAnimationCurve> to_return(
 187       KeyframedColorAnimationCurve::Create());
 188   for (size_t i = 0; i < keyframes_.size(); ++i)
 189     to_return->AddKeyframe(keyframes_[i]->Clone());
 190   return to_return.PassAs<AnimationCurve>();
 191 }
 192
 193 SkColor KeyframedColorAnimationCurve::GetValue(double t) const {
 194   if (t <= keyframes_.front()->Time())
 195     return keyframes_.front()->Value();
 196
 197   if (t >= keyframes_.back()->Time())
 198     return keyframes_.back()->Value();
 199
 200   size_t i = 0;
 201   for (; i < keyframes_.size() - 1; ++i) {
 202     if (t < keyframes_[i + 1]->Time())
 203       break;
 204   }
 205
 206   float progress = GetProgress(t, i, keyframes_);
 207
 208   return gfx::Tween::ColorValueBetween(
 209       progress, keyframes_[i]->Value(), keyframes_[i + 1]->Value());
 210 }
 211
 212 // KeyframedFloatAnimationCurve
 213
 214 scoped_ptr<KeyframedFloatAnimationCurve> KeyframedFloatAnimationCurve::
 215     Create() {
 216   return make_scoped_ptr(new KeyframedFloatAnimationCurve);
 217 }
 218
 219 KeyframedFloatAnimationCurve::KeyframedFloatAnimationCurve() {}
 220
 221 KeyframedFloatAnimationCurve::~KeyframedFloatAnimationCurve() {}
 222
 223 void KeyframedFloatAnimationCurve::AddKeyframe(
 224     scoped_ptr<FloatKeyframe> keyframe) {
 225   InsertKeyframe(keyframe.Pass(), keyframes_);
 226 }
 227
 228 double KeyframedFloatAnimationCurve::Duration() const {
 229   return keyframes_.back()->Time() - keyframes_.front()->Time();
 230 }
 231
 232 scoped_ptr<AnimationCurve> KeyframedFloatAnimationCurve::Clone() const {
 233   scoped_ptr<KeyframedFloatAnimationCurve> to_return(
 234       KeyframedFloatAnimationCurve::Create());
 235   for (size_t i = 0; i < keyframes_.size(); ++i)
 236     to_return->AddKeyframe(keyframes_[i]->Clone());
 237   return to_return.PassAs<AnimationCurve>();
 238 }
 239
 240 float KeyframedFloatAnimationCurve::GetValue(double t) const {
 241   if (t <= keyframes_.front()->Time())
 242     return keyframes_.front()->Value();
 243
 244   if (t >= keyframes_.back()->Time())
 245     return keyframes_.back()->Value();
 246
 247   size_t i = 0;
 248   for (; i < keyframes_.size() - 1; ++i) {
 249     if (t < keyframes_[i+1]->Time())
 250       break;
 251   }
 252
 253   float progress = GetProgress(t, i, keyframes_);
 254
 255   return keyframes_[i]->Value() +
 256       (keyframes_[i+1]->Value() - keyframes_[i]->Value()) * progress;
 257 }
 258
 259 scoped_ptr<KeyframedTransformAnimationCurve> KeyframedTransformAnimationCurve::
 260     Create() {
 261   return make_scoped_ptr(new KeyframedTransformAnimationCurve);
 262 }
 263
 264 KeyframedTransformAnimationCurve::KeyframedTransformAnimationCurve() {}
 265
 266 KeyframedTransformAnimationCurve::~KeyframedTransformAnimationCurve() {}
 267
 268 void KeyframedTransformAnimationCurve::AddKeyframe(
 269     scoped_ptr<TransformKeyframe> keyframe) {
 270   InsertKeyframe(keyframe.Pass(), keyframes_);
 271 }
 272
 273 double KeyframedTransformAnimationCurve::Duration() const {
 274   return keyframes_.back()->Time() - keyframes_.front()->Time();
 275 }
 276
 277 scoped_ptr<AnimationCurve> KeyframedTransformAnimationCurve::Clone() const {
 278   scoped_ptr<KeyframedTransformAnimationCurve> to_return(
 279       KeyframedTransformAnimationCurve::Create());
 280   for (size_t i = 0; i < keyframes_.size(); ++i)
 281     to_return->AddKeyframe(keyframes_[i]->Clone());
 282   return to_return.PassAs<AnimationCurve>();
 283 }
 284
 285 // Assumes that (*keyframes).front()->Time() < t < (*keyframes).back()-Time().
 286 template<typename ValueType, typename KeyframeType>
 287 static ValueType GetCurveValue(const ScopedPtrVector<KeyframeType>* keyframes,
 288                                double t) {
 289   size_t i = 0;
 290   for (; i < keyframes->size() - 1; ++i) {
 291     if (t < (*keyframes)[i+1]->Time())
 292       break;
 293   }
 294
 295   double progress = (t - (*keyframes)[i]->Time()) /
 296                     ((*keyframes)[i+1]->Time() - (*keyframes)[i]->Time());
 297
 298   if ((*keyframes)[i]->timing_function())
 299     progress = (*keyframes)[i]->timing_function()->GetValue(progress);
 300
 301   return (*keyframes)[i+1]->Value().Blend((*keyframes)[i]->Value(), progress);
 302 }
 303
 304 gfx::Transform KeyframedTransformAnimationCurve::GetValue(double t) const {
 305   if (t <= keyframes_.front()->Time())
 306     return keyframes_.front()->Value().Apply();
 307
 308   if (t >= keyframes_.back()->Time())
 309     return keyframes_.back()->Value().Apply();
 310
 311   return GetCurveValue<gfx::Transform, TransformKeyframe>(&keyframes_, t);
 312 }
 313
 314 bool KeyframedTransformAnimationCurve::AnimatedBoundsForBox(
 315     const gfx::BoxF& box,
 316     gfx::BoxF* bounds) const {
 317   DCHECK_GE(keyframes_.size(), 2ul);
 318   *bounds = gfx::BoxF();
 319   for (size_t i = 0; i < keyframes_.size() - 1; ++i) {
 320     gfx::BoxF bounds_for_step;
 321     float min_progress = 0.0;
 322     float max_progress = 1.0;
 323     if (keyframes_[i]->timing_function())
 324       keyframes_[i]->timing_function()->Range(&min_progress, &max_progress);
 325     if (!keyframes_[i+1]->Value().BlendedBoundsForBox(box,
 326                                                       keyframes_[i]->Value(),
 327                                                       min_progress,
 328                                                       max_progress,
 329                                                       &bounds_for_step))
 330       return false;
 331     bounds->Union(bounds_for_step);
 332   }
 333   return true;
 334 }
 335
 336 scoped_ptr<KeyframedFilterAnimationCurve> KeyframedFilterAnimationCurve::
 337     Create() {
 338   return make_scoped_ptr(new KeyframedFilterAnimationCurve);
 339 }
 340
 341 KeyframedFilterAnimationCurve::KeyframedFilterAnimationCurve() {}
 342
 343 KeyframedFilterAnimationCurve::~KeyframedFilterAnimationCurve() {}
 344
 345 void KeyframedFilterAnimationCurve::AddKeyframe(
 346     scoped_ptr<FilterKeyframe> keyframe) {
 347   InsertKeyframe(keyframe.Pass(), keyframes_);
 348 }
 349
 350 double KeyframedFilterAnimationCurve::Duration() const {
 351   return keyframes_.back()->Time() - keyframes_.front()->Time();
 352 }
 353
 354 scoped_ptr<AnimationCurve> KeyframedFilterAnimationCurve::Clone() const {
 355   scoped_ptr<KeyframedFilterAnimationCurve> to_return(
 356       KeyframedFilterAnimationCurve::Create());
 357   for (size_t i = 0; i < keyframes_.size(); ++i)
 358     to_return->AddKeyframe(keyframes_[i]->Clone());
 359   return to_return.PassAs<AnimationCurve>();
 360 }
 361
 362 FilterOperations KeyframedFilterAnimationCurve::GetValue(double t) const {
 363   if (t <= keyframes_.front()->Time())
 364     return keyframes_.front()->Value();
 365
 366   if (t >= keyframes_.back()->Time())
 367     return keyframes_.back()->Value();
 368
 369   return GetCurveValue<FilterOperations, FilterKeyframe>(&keyframes_, t);
 370 }
 371
 372 }  // namespace cc