Source/WebCore/page/animation/CSSPropertyAnimation.cpp

   1 /*
   2  * Copyright (C) 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
   3  * Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved.
   4  *
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   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
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  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "CSSPropertyAnimation.h"
  32
  33 #include "AnimationBase.h"
  34 #include "CSSComputedStyleDeclaration.h"
  35 #include "CSSCrossfadeValue.h"
  36 #include "CSSFilterImageValue.h"
  37 #include "CSSImageGeneratorValue.h"
  38 #include "CSSImageValue.h"
  39 #include "CSSPrimitiveValue.h"
  40 #include "CSSPropertyNames.h"
  41 #include "CachedImage.h"
  42 #include "ClipPathOperation.h"
  43 #include "FloatConversion.h"
  44 #include "IdentityTransformOperation.h"
  45 #include "Matrix3DTransformOperation.h"
  46 #include "MatrixTransformOperation.h"
  47 #include "RenderBox.h"
  48 #include "RenderStyle.h"
  49 #include "StyleCachedImage.h"
  50 #include "StyleGeneratedImage.h"
  51 #include "StylePropertyShorthand.h"
  52 #include "StyleResolver.h"
  53 #include <algorithm>
  54 #include <wtf/MathExtras.h>
  55 #include <wtf/Noncopyable.h>
  56 #include <wtf/RefCounted.h>
  57
  58 namespace WebCore {
  59
  60 static inline int blendFunc(const AnimationBase*, int from, int to, double progress)
  61 {
  62     return blend(from, to, progress);
  63 }
  64
  65 static inline unsigned blendFunc(const AnimationBase*, unsigned from, unsigned to, double progress)
  66 {
  67     return blend(from, to, progress);
  68 }
  69
  70 static inline double blendFunc(const AnimationBase*, double from, double to, double progress)
  71 {
  72     return blend(from, to, progress);
  73 }
  74
  75 static inline float blendFunc(const AnimationBase*, float from, float to, double progress)
  76 {
  77     return narrowPrecisionToFloat(from + (to - from) * progress);
  78 }
  79
  80 static inline Color blendFunc(const AnimationBase*, const Color& from, const Color& to, double progress)
  81 {
  82     return blend(from, to, progress);
  83 }
  84
  85 static inline Length blendFunc(const AnimationBase*, const Length& from, const Length& to, double progress)
  86 {
  87     return to.blend(from, narrowPrecisionToFloat(progress));
  88 }
  89
  90 static inline LengthSize blendFunc(const AnimationBase* anim, const LengthSize& from, const LengthSize& to, double progress)
  91 {
  92     return LengthSize(blendFunc(anim, from.width(), to.width(), progress),
  93                       blendFunc(anim, from.height(), to.height(), progress));
  94 }
  95
  96 static inline ShadowStyle blendFunc(const AnimationBase* anim, ShadowStyle from, ShadowStyle to, double progress)
  97 {
  98     if (from == to)
  99         return to;
 100
 101     double fromVal = from == Normal ? 1 : 0;
 102     double toVal = to == Normal ? 1 : 0;
 103     double result = blendFunc(anim, fromVal, toVal, progress);
 104     return result > 0 ? Normal : Inset;
 105 }
 106
 107 static inline PassOwnPtr<ShadowData> blendFunc(const AnimationBase* anim, const ShadowData* from, const ShadowData* to, double progress)
 108 {
 109     ASSERT(from && to);
 110     if (from->style() != to->style())
 111         return adoptPtr(new ShadowData(*to));
 112
 113     return adoptPtr(new ShadowData(blend(from->location(), to->location(), progress),
 114                                    blend(from->radius(), to->radius(), progress),
 115                                    blend(from->spread(), to->spread(), progress),
 116                                    blendFunc(anim, from->style(), to->style(), progress),
 117                                    from->isWebkitBoxShadow(),
 118                                    blend(from->color(), to->color(), progress)));
 119 }
 120
 121 static inline TransformOperations blendFunc(const AnimationBase* anim, const TransformOperations& from, const TransformOperations& to, double progress)
 122 {
 123     if (anim->isTransformFunctionListValid())
 124         return to.blendByMatchingOperations(from, progress);
 125     return to.blendByUsingMatrixInterpolation(from, progress, anim->renderer()->isBox() ? toRenderBox(anim->renderer())->borderBoxRect().size() : LayoutSize());
 126 }
 127
 128 static inline PassRefPtr<ClipPathOperation> blendFunc(const AnimationBase*, ClipPathOperation* from, ClipPathOperation* to, double progress)
 129 {
 130     if (!from || !to)
 131         return to;
 132
 133     // Other clip-path operations than BasicShapes can not be animated.
 134     if (from->type() != ClipPathOperation::SHAPE || to->type() != ClipPathOperation::SHAPE)
 135         return to;
 136
 137     const BasicShape* fromShape = static_cast<ShapeClipPathOperation*>(from)->basicShape();
 138     const BasicShape* toShape = static_cast<ShapeClipPathOperation*>(to)->basicShape();
 139
 140     if (!fromShape->canBlend(toShape))
 141         return to;
 142
 143     return ShapeClipPathOperation::create(toShape->blend(fromShape, progress));
 144 }
 145
 146 #if ENABLE(CSS_SHAPES)
 147 static inline PassRefPtr<ShapeValue> blendFunc(const AnimationBase*, ShapeValue* from, ShapeValue* to, double progress)
 148 {
 149     // FIXME Bug 102723: Shape-inside should be able to animate a value of 'outside-shape' when shape-outside is set to a BasicShape
 150     if (from->type() != ShapeValue::Shape || to->type() != ShapeValue::Shape)
 151         return to;
 152
 153     const BasicShape* fromShape = from->shape();
 154     const BasicShape* toShape = to->shape();
 155
 156     if (!fromShape->canBlend(toShape))
 157         return to;
 158
 159     return ShapeValue::createShapeValue(toShape->blend(fromShape, progress));
 160 }
 161 #endif
 162
 163 #if ENABLE(CSS_FILTERS)
 164 static inline PassRefPtr<FilterOperation> blendFunc(const AnimationBase* anim, FilterOperation* fromOp, FilterOperation* toOp, double progress, bool blendToPassthrough = false)
 165 {
 166     ASSERT(toOp);
 167     if (toOp->blendingNeedsRendererSize()) {
 168         LayoutSize size = anim->renderer()->isBox() ? toRenderBox(anim->renderer())->borderBoxRect().size() : LayoutSize();
 169         return toOp->blend(fromOp, progress, size, blendToPassthrough);
 170     }
 171     return toOp->blend(fromOp, progress, blendToPassthrough);
 172 }
 173
 174 static inline FilterOperations blendFilterOperations(const AnimationBase* anim,  const FilterOperations& from, const FilterOperations& to, double progress)
 175 {
 176     FilterOperations result;
 177     size_t fromSize = from.operations().size();
 178     size_t toSize = to.operations().size();
 179     size_t size = std::max(fromSize, toSize);
 180     for (size_t i = 0; i < size; i++) {
 181         RefPtr<FilterOperation> fromOp = (i < fromSize) ? from.operations()[i].get() : 0;
 182         RefPtr<FilterOperation> toOp = (i < toSize) ? to.operations()[i].get() : 0;
 183         RefPtr<FilterOperation> blendedOp = toOp ? blendFunc(anim, fromOp.get(), toOp.get(), progress) : (fromOp ? blendFunc(anim, 0, fromOp.get(), progress, true) : 0);
 184         if (blendedOp)
 185             result.operations().append(blendedOp);
 186         else {
 187             RefPtr<FilterOperation> identityOp = PassthroughFilterOperation::create();
 188             if (progress > 0.5)
 189                 result.operations().append(toOp ? toOp : identityOp);
 190             else
 191                 result.operations().append(fromOp ? fromOp : identityOp);
 192         }
 193     }
 194     return result;
 195 }
 196
 197 static inline FilterOperations blendFunc(const AnimationBase* anim, const FilterOperations& from, const FilterOperations& to, double progress)
 198 {
 199     FilterOperations result;
 200
 201     // If we have a filter function list, use that to do a per-function animation.
 202     if (anim->filterFunctionListsMatch())
 203         result = blendFilterOperations(anim, from, to, progress);
 204     else {
 205         // If the filter function lists don't match, we could try to cross-fade, but don't yet have a way to represent that in CSS.
 206         // For now we'll just fail to animate.
 207         result = to;
 208     }
 209
 210     return result;
 211 }
 212
 213 static inline PassRefPtr<StyleImage> blendFilter(const AnimationBase* anim, CachedImage* image, const FilterOperations& from, const FilterOperations& to, double progress)
 214 {
 215     ASSERT(image);
 216     FilterOperations filterResult = blendFilterOperations(anim, from, to, progress);
 217
 218     RefPtr<StyleCachedImage> styledImage = StyleCachedImage::create(image);
 219     auto imageValue = CSSImageValue::create(image->url(), styledImage.get());
 220     auto filterValue = ComputedStyleExtractor::valueForFilter(anim->renderer(), &anim->renderer()->style(), filterResult, DoNotAdjustPixelValues);
 221
 222     auto result = CSSFilterImageValue::create(std::move(imageValue), std::move(filterValue));
 223     result.get().setFilterOperations(filterResult);
 224     return StyleGeneratedImage::create(std::move(result));
 225 }
 226 #endif // ENABLE(CSS_FILTERS)
 227
 228 static inline EVisibility blendFunc(const AnimationBase* anim, EVisibility from, EVisibility to, double progress)
 229 {
 230     // Any non-zero result means we consider the object to be visible. Only at 0 do we consider the object to be
 231     // invisible. The invisible value we use (HIDDEN vs. COLLAPSE) depends on the specified from/to values.
 232     double fromVal = from == VISIBLE ? 1. : 0.;
 233     double toVal = to == VISIBLE ? 1. : 0.;
 234     if (fromVal == toVal)
 235         return to;
 236     double result = blendFunc(anim, fromVal, toVal, progress);
 237     return result > 0. ? VISIBLE : (to != VISIBLE ? to : from);
 238 }
 239
 240 static inline LengthBox blendFunc(const AnimationBase* anim, const LengthBox& from, const LengthBox& to, double progress)
 241 {
 242     LengthBox result(blendFunc(anim, from.top(), to.top(), progress),
 243                      blendFunc(anim, from.right(), to.right(), progress),
 244                      blendFunc(anim, from.bottom(), to.bottom(), progress),
 245                      blendFunc(anim, from.left(), to.left(), progress));
 246     return result;
 247 }
 248
 249 #if ENABLE(SVG)
 250 static inline SVGLength blendFunc(const AnimationBase*, const SVGLength& from, const SVGLength& to, double progress)
 251 {
 252     return to.blend(from, narrowPrecisionToFloat(progress));
 253 }
 254 static inline Vector<SVGLength> blendFunc(const AnimationBase*, const Vector<SVGLength>& from, const Vector<SVGLength>& to, double progress)
 255 {
 256     size_t fromLength = from.size();
 257     size_t toLength = to.size();
 258     if (!fromLength)
 259         return !progress ? from : to;
 260     if (!toLength)
 261         return progress == 1 ? from : to;
 262     size_t resultLength = fromLength;
 263     if (fromLength != toLength) {
 264         if (!remainder(std::max(fromLength, toLength), std::min(fromLength, toLength)))
 265             resultLength = std::max(fromLength, toLength);
 266         else
 267             resultLength = fromLength * toLength;
 268     }
 269     Vector<SVGLength> result(resultLength);
 270     for (size_t i = 0; i < resultLength; ++i)
 271         result[i] = to[i % toLength].blend(from[i % fromLength], narrowPrecisionToFloat(progress));
 272     return result;
 273 }
 274 #endif
 275
 276 static inline PassRefPtr<StyleImage> crossfadeBlend(const AnimationBase*, StyleCachedImage* fromStyleImage, StyleCachedImage* toStyleImage, double progress)
 277 {
 278     // If progress is at one of the extremes, we want getComputedStyle to show the image,
 279     // not a completed cross-fade, so we hand back one of the existing images.
 280     if (!progress)
 281         return fromStyleImage;
 282     if (progress == 1)
 283         return toStyleImage;
 284
 285     auto fromImageValue = CSSImageValue::create(fromStyleImage->cachedImage()->url(), fromStyleImage);
 286     auto toImageValue = CSSImageValue::create(toStyleImage->cachedImage()->url(), toStyleImage);
 287
 288     auto crossfadeValue = CSSCrossfadeValue::create(std::move(fromImageValue), std::move(toImageValue));
 289     crossfadeValue.get().setPercentage(CSSPrimitiveValue::create(progress, CSSPrimitiveValue::CSS_NUMBER));
 290     return StyleGeneratedImage::create(std::move(crossfadeValue));
 291 }
 292
 293 static inline PassRefPtr<StyleImage> blendFunc(const AnimationBase* anim, StyleImage* from, StyleImage* to, double progress)
 294 {
 295     if (!from || !to)
 296         return to;
 297
 298     // Animation between two generated images. Cross fade for all other cases.
 299     if (from->isGeneratedImage() && to->isGeneratedImage()) {
 300         CSSImageGeneratorValue& fromGenerated = toStyleGeneratedImage(from)->imageValue();
 301         CSSImageGeneratorValue& toGenerated = toStyleGeneratedImage(to)->imageValue();
 302
 303 #if ENABLE(CSS_FILTERS)
 304         if (fromGenerated.isFilterImageValue() && toGenerated.isFilterImageValue()) {
 305             // Animation of generated images just possible if input images are equal.
 306             // Otherwise fall back to cross fade animation.
 307             CSSFilterImageValue& fromFilter = toCSSFilterImageValue(fromGenerated);
 308             CSSFilterImageValue& toFilter = toCSSFilterImageValue(toGenerated);
 309             if (fromFilter.equalInputImages(toFilter) && fromFilter.cachedImage())
 310                 return blendFilter(anim, fromFilter.cachedImage(), fromFilter.filterOperations(), toFilter.filterOperations(), progress);
 311         }
 312 #endif
 313
 314         if (fromGenerated.isCrossfadeValue() && toGenerated.isCrossfadeValue()) {
 315             CSSCrossfadeValue& fromCrossfade = toCSSCrossfadeValue(fromGenerated);
 316             CSSCrossfadeValue& toCrossfade = toCSSCrossfadeValue(toGenerated);
 317             if (fromCrossfade.equalInputImages(toCrossfade))
 318                 return StyleGeneratedImage::create(*toCrossfade.blend(fromCrossfade, progress));
 319         }
 320
 321         // FIXME: Add support for animation between two *gradient() functions.
 322         // https://bugs.webkit.org/show_bug.cgi?id=119956
 323 #if ENABLE(CSS_FILTERS)
 324     } else if (from->isGeneratedImage() && to->isCachedImage()) {
 325         CSSImageGeneratorValue& fromGenerated = toStyleGeneratedImage(from)->imageValue();
 326         if (fromGenerated.isFilterImageValue()) {
 327             CSSFilterImageValue& fromFilter = toCSSFilterImageValue(fromGenerated);
 328             if (fromFilter.cachedImage() && static_cast<StyleCachedImage*>(to)->cachedImage() == fromFilter.cachedImage())
 329                 return blendFilter(anim, fromFilter.cachedImage(), fromFilter.filterOperations(), FilterOperations(), progress);
 330         }
 331         // FIXME: Add interpolation between cross-fade and image source.
 332     } else if (from->isCachedImage() && to->isGeneratedImage()) {
 333         CSSImageGeneratorValue& toGenerated = toStyleGeneratedImage(to)->imageValue();
 334         if (toGenerated.isFilterImageValue()) {
 335             CSSFilterImageValue& toFilter = toCSSFilterImageValue(toGenerated);
 336             if (toFilter.cachedImage() && static_cast<StyleCachedImage*>(from)->cachedImage() == toFilter.cachedImage())
 337                 return blendFilter(anim, toFilter.cachedImage(), FilterOperations(), toFilter.filterOperations(), progress);
 338         }
 339 #endif
 340         // FIXME: Add interpolation between image source and cross-fade.
 341     }
 342
 343     // FIXME: Add support cross fade between cached and generated images.
 344     // https://bugs.webkit.org/show_bug.cgi?id=78293
 345     if (from->isCachedImage() && to->isCachedImage())
 346         return crossfadeBlend(anim, static_cast<StyleCachedImage*>(from), static_cast<StyleCachedImage*>(to), progress);
 347
 348     return to;
 349 }
 350
 351 static inline NinePieceImage blendFunc(const AnimationBase* anim, const NinePieceImage& from, const NinePieceImage& to, double progress)
 352 {
 353     if (!from.hasImage() || !to.hasImage())
 354         return to;
 355
 356     // FIXME (74112): Support transitioning between NinePieceImages that differ by more than image content.
 357
 358     if (from.imageSlices() != to.imageSlices() || from.borderSlices() != to.borderSlices() || from.outset() != to.outset() || from.fill() != to.fill() || from.horizontalRule() != to.horizontalRule() || from.verticalRule() != to.verticalRule())
 359         return to;
 360
 361     if (from.image()->imageSize(anim->renderer(), 1.0) != to.image()->imageSize(anim->renderer(), 1.0))
 362         return to;
 363
 364     RefPtr<StyleImage> newContentImage = blendFunc(anim, from.image(), to.image(), progress);
 365
 366     return NinePieceImage(newContentImage, from.imageSlices(), from.fill(), from.borderSlices(), from.outset(), from.horizontalRule(), from.verticalRule());
 367 }
 368
 369 class AnimationPropertyWrapperBase {
 370     WTF_MAKE_NONCOPYABLE(AnimationPropertyWrapperBase);
 371     WTF_MAKE_FAST_ALLOCATED;
 372 public:
 373     AnimationPropertyWrapperBase(CSSPropertyID prop)
 374         : m_prop(prop)
 375     {
 376     }
 377
 378     virtual ~AnimationPropertyWrapperBase() { }
 379
 380     virtual bool isShorthandWrapper() const { return false; }
 381     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const = 0;
 382     virtual void blend(const AnimationBase*, RenderStyle*, const RenderStyle*, const RenderStyle*, double) const = 0;
 383
 384     CSSPropertyID property() const { return m_prop; }
 385
 386 #if USE(ACCELERATED_COMPOSITING)
 387     virtual bool animationIsAccelerated() const { return false; }
 388 #endif
 389
 390 private:
 391     CSSPropertyID m_prop;
 392 };
 393
 394 template <typename T>
 395 class PropertyWrapperGetter : public AnimationPropertyWrapperBase {
 396 public:
 397     PropertyWrapperGetter(CSSPropertyID prop, T (RenderStyle::*getter)() const)
 398         : AnimationPropertyWrapperBase(prop)
 399         , m_getter(getter)
 400     {
 401     }
 402
 403     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 404     {
 405         // If the style pointers are the same, don't bother doing the test.
 406         // If either is null, return false. If both are null, return true.
 407         if ((!a && !b) || a == b)
 408             return true;
 409         if (!a || !b)
 410             return false;
 411         return (a->*m_getter)() == (b->*m_getter)();
 412     }
 413
 414 protected:
 415     T (RenderStyle::*m_getter)() const;
 416 };
 417
 418 template <typename T>
 419 class PropertyWrapper : public PropertyWrapperGetter<T> {
 420 public:
 421     PropertyWrapper(CSSPropertyID prop, T (RenderStyle::*getter)() const, void (RenderStyle::*setter)(T))
 422         : PropertyWrapperGetter<T>(prop, getter)
 423         , m_setter(setter)
 424     {
 425     }
 426
 427     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 428     {
 429         (dst->*m_setter)(blendFunc(anim, (a->*PropertyWrapperGetter<T>::m_getter)(), (b->*PropertyWrapperGetter<T>::m_getter)(), progress));
 430     }
 431
 432 protected:
 433     void (RenderStyle::*m_setter)(T);
 434 };
 435
 436 template <typename T>
 437 class RefCountedPropertyWrapper : public PropertyWrapperGetter<T*> {
 438 public:
 439     RefCountedPropertyWrapper(CSSPropertyID prop, T* (RenderStyle::*getter)() const, void (RenderStyle::*setter)(PassRefPtr<T>))
 440         : PropertyWrapperGetter<T*>(prop, getter)
 441         , m_setter(setter)
 442     {
 443     }
 444
 445     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 446     {
 447         (dst->*m_setter)(blendFunc(anim, (a->*PropertyWrapperGetter<T*>::m_getter)(), (b->*PropertyWrapperGetter<T*>::m_getter)(), progress));
 448     }
 449
 450 protected:
 451     void (RenderStyle::*m_setter)(PassRefPtr<T>);
 452 };
 453
 454 template <typename T>
 455 class LengthPropertyWrapper : public PropertyWrapperGetter<const T&> {
 456 public:
 457     LengthPropertyWrapper(CSSPropertyID prop, const T& (RenderStyle::*getter)() const, void (RenderStyle::*setter)(T))
 458         : PropertyWrapperGetter<const T&>(prop, getter)
 459         , m_setter(setter)
 460     {
 461     }
 462
 463     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 464     {
 465         (dst->*m_setter)(blendFunc(anim, (a->*PropertyWrapperGetter<const T&>::m_getter)(), (b->*PropertyWrapperGetter<const T&>::m_getter)(), progress));
 466     }
 467
 468 protected:
 469     void (RenderStyle::*m_setter)(T);
 470 };
 471
 472 class PropertyWrapperClipPath : public RefCountedPropertyWrapper<ClipPathOperation> {
 473 public:
 474     PropertyWrapperClipPath(CSSPropertyID prop, ClipPathOperation* (RenderStyle::*getter)() const, void (RenderStyle::*setter)(PassRefPtr<ClipPathOperation>))
 475         : RefCountedPropertyWrapper<ClipPathOperation>(prop, getter, setter)
 476     {
 477     }
 478 };
 479
 480 #if ENABLE(CSS_SHAPES)
 481 class PropertyWrapperShape : public RefCountedPropertyWrapper<ShapeValue> {
 482 public:
 483     PropertyWrapperShape(CSSPropertyID prop, ShapeValue* (RenderStyle::*getter)() const, void (RenderStyle::*setter)(PassRefPtr<ShapeValue>))
 484         : RefCountedPropertyWrapper<ShapeValue>(prop, getter, setter)
 485     {
 486     }
 487 };
 488 #endif
 489
 490 class StyleImagePropertyWrapper : public RefCountedPropertyWrapper<StyleImage> {
 491 public:
 492     StyleImagePropertyWrapper(CSSPropertyID prop, StyleImage* (RenderStyle::*getter)() const, void (RenderStyle::*setter)(PassRefPtr<StyleImage>))
 493         : RefCountedPropertyWrapper<StyleImage>(prop, getter, setter)
 494     {
 495     }
 496
 497     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 498     {
 499        // If the style pointers are the same, don't bother doing the test.
 500        // If either is null, return false. If both are null, return true.
 501        if (a == b)
 502            return true;
 503        if (!a || !b)
 504             return false;
 505
 506         StyleImage* imageA = (a->*m_getter)();
 507         StyleImage* imageB = (b->*m_getter)();
 508         return StyleImage::imagesEquivalent(imageA, imageB);
 509     }
 510 };
 511
 512 class PropertyWrapperColor : public PropertyWrapperGetter<Color> {
 513 public:
 514     PropertyWrapperColor(CSSPropertyID prop, Color (RenderStyle::*getter)() const, void (RenderStyle::*setter)(const Color&))
 515         : PropertyWrapperGetter<Color>(prop, getter)
 516         , m_setter(setter)
 517     {
 518     }
 519
 520     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 521     {
 522         (dst->*m_setter)(blendFunc(anim, (a->*PropertyWrapperGetter<Color>::m_getter)(), (b->*PropertyWrapperGetter<Color>::m_getter)(), progress));
 523     }
 524
 525 protected:
 526     void (RenderStyle::*m_setter)(const Color&);
 527 };
 528
 529
 530 #if USE(ACCELERATED_COMPOSITING)
 531 class PropertyWrapperAcceleratedOpacity : public PropertyWrapper<float> {
 532 public:
 533     PropertyWrapperAcceleratedOpacity()
 534         : PropertyWrapper<float>(CSSPropertyOpacity, &RenderStyle::opacity, &RenderStyle::setOpacity)
 535     {
 536     }
 537
 538     virtual bool animationIsAccelerated() const { return true; }
 539
 540     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 541     {
 542         float fromOpacity = a->opacity();
 543
 544         // This makes sure we put the object being animated into a RenderLayer during the animation
 545         dst->setOpacity(blendFunc(anim, (fromOpacity == 1) ? 0.999999f : fromOpacity, b->opacity(), progress));
 546     }
 547 };
 548
 549 class PropertyWrapperAcceleratedTransform : public PropertyWrapper<const TransformOperations&> {
 550 public:
 551     PropertyWrapperAcceleratedTransform()
 552         : PropertyWrapper<const TransformOperations&>(CSSPropertyWebkitTransform, &RenderStyle::transform, &RenderStyle::setTransform)
 553     {
 554     }
 555
 556     virtual bool animationIsAccelerated() const { return true; }
 557
 558     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 559     {
 560         dst->setTransform(blendFunc(anim, a->transform(), b->transform(), progress));
 561     }
 562 };
 563
 564 #if ENABLE(CSS_FILTERS)
 565 class PropertyWrapperAcceleratedFilter : public PropertyWrapper<const FilterOperations&> {
 566 public:
 567     PropertyWrapperAcceleratedFilter()
 568         : PropertyWrapper<const FilterOperations&>(CSSPropertyWebkitFilter, &RenderStyle::filter, &RenderStyle::setFilter)
 569     {
 570     }
 571
 572     virtual bool animationIsAccelerated() const { return true; }
 573
 574     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 575     {
 576         dst->setFilter(blendFunc(anim, a->filter(), b->filter(), progress));
 577     }
 578 };
 579 #endif
 580 #endif // USE(ACCELERATED_COMPOSITING)
 581
 582 static inline size_t shadowListLength(const ShadowData* shadow)
 583 {
 584     size_t count;
 585     for (count = 0; shadow; shadow = shadow->next())
 586         ++count;
 587     return count;
 588 }
 589
 590 static inline const ShadowData* shadowForBlending(const ShadowData* srcShadow, const ShadowData* otherShadow)
 591 {
 592     DEFINE_STATIC_LOCAL(ShadowData, defaultShadowData, (IntPoint(), 0, 0, Normal, false, Color::transparent));
 593     DEFINE_STATIC_LOCAL(ShadowData, defaultInsetShadowData, (IntPoint(), 0, 0, Inset, false, Color::transparent));
 594
 595     DEFINE_STATIC_LOCAL(ShadowData, defaultWebKitBoxShadowData, (IntPoint(), 0, 0, Normal, true, Color::transparent));
 596     DEFINE_STATIC_LOCAL(ShadowData, defaultInsetWebKitBoxShadowData, (IntPoint(), 0, 0, Inset, true, Color::transparent));
 597
 598     if (srcShadow)
 599         return srcShadow;
 600
 601     if (otherShadow->style() == Inset)
 602         return otherShadow->isWebkitBoxShadow() ? &defaultInsetWebKitBoxShadowData : &defaultInsetShadowData;
 603
 604     return otherShadow->isWebkitBoxShadow() ? &defaultWebKitBoxShadowData : &defaultShadowData;
 605 }
 606
 607 class PropertyWrapperShadow : public AnimationPropertyWrapperBase {
 608 public:
 609     PropertyWrapperShadow(CSSPropertyID prop, const ShadowData* (RenderStyle::*getter)() const, void (RenderStyle::*setter)(PassOwnPtr<ShadowData>, bool))
 610         : AnimationPropertyWrapperBase(prop)
 611         , m_getter(getter)
 612         , m_setter(setter)
 613     {
 614     }
 615
 616     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 617     {
 618         const ShadowData* shadowA = (a->*m_getter)();
 619         const ShadowData* shadowB = (b->*m_getter)();
 620
 621         while (true) {
 622             // end of both lists
 623             if (!shadowA && !shadowB)
 624                 return true;
 625
 626             // end of just one of the lists
 627             if (!shadowA || !shadowB)
 628                 return false;
 629
 630             if (*shadowA != *shadowB)
 631                 return false;
 632
 633             shadowA = shadowA->next();
 634             shadowB = shadowB->next();
 635         }
 636
 637         return true;
 638     }
 639
 640     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 641     {
 642         const ShadowData* shadowA = (a->*m_getter)();
 643         const ShadowData* shadowB = (b->*m_getter)();
 644
 645         int fromLength = shadowListLength(shadowA);
 646         int toLength = shadowListLength(shadowB);
 647
 648         if (fromLength == toLength || (fromLength <= 1 && toLength <= 1)) {
 649             (dst->*m_setter)(blendSimpleOrMatchedShadowLists(anim, progress, shadowA, shadowB), false);
 650             return;
 651         }
 652
 653         (dst->*m_setter)(blendMismatchedShadowLists(anim, progress, shadowA, shadowB, fromLength, toLength), false);
 654     }
 655
 656 private:
 657     PassOwnPtr<ShadowData> blendSimpleOrMatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB) const
 658     {
 659         OwnPtr<ShadowData> newShadowData;
 660         ShadowData* lastShadow = 0;
 661
 662         while (shadowA || shadowB) {
 663             const ShadowData* srcShadow = shadowForBlending(shadowA, shadowB);
 664             const ShadowData* dstShadow = shadowForBlending(shadowB, shadowA);
 665
 666             OwnPtr<ShadowData> blendedShadow = blendFunc(anim, srcShadow, dstShadow, progress);
 667             ShadowData* blendedShadowPtr = blendedShadow.get();
 668
 669             if (!lastShadow)
 670                 newShadowData = blendedShadow.release();
 671             else
 672                 lastShadow->setNext(blendedShadow.release());
 673
 674             lastShadow = blendedShadowPtr;
 675
 676             shadowA = shadowA ? shadowA->next() : 0;
 677             shadowB = shadowB ? shadowB->next() : 0;
 678         }
 679
 680         return newShadowData.release();
 681     }
 682
 683     PassOwnPtr<ShadowData> blendMismatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB, int fromLength, int toLength) const
 684     {
 685         // The shadows in ShadowData are stored in reverse order, so when animating mismatched lists,
 686         // reverse them and match from the end.
 687         Vector<const ShadowData*, 4> fromShadows(fromLength);
 688         for (int i = fromLength - 1; i >= 0; --i) {
 689             fromShadows[i] = shadowA;
 690             shadowA = shadowA->next();
 691         }
 692
 693         Vector<const ShadowData*, 4> toShadows(toLength);
 694         for (int i = toLength - 1; i >= 0; --i) {
 695             toShadows[i] = shadowB;
 696             shadowB = shadowB->next();
 697         }
 698
 699         OwnPtr<ShadowData> newShadowData;
 700
 701         int maxLength = std::max(fromLength, toLength);
 702         for (int i = 0; i < maxLength; ++i) {
 703             const ShadowData* fromShadow = i < fromLength ? fromShadows[i] : 0;
 704             const ShadowData* toShadow = i < toLength ? toShadows[i] : 0;
 705
 706             const ShadowData* srcShadow = shadowForBlending(fromShadow, toShadow);
 707             const ShadowData* dstShadow = shadowForBlending(toShadow, fromShadow);
 708
 709             OwnPtr<ShadowData> blendedShadow = blendFunc(anim, srcShadow, dstShadow, progress);
 710             // Insert at the start of the list to preserve the order.
 711             blendedShadow->setNext(newShadowData.release());
 712             newShadowData = blendedShadow.release();
 713         }
 714
 715         return newShadowData.release();
 716     }
 717
 718     const ShadowData* (RenderStyle::*m_getter)() const;
 719     void (RenderStyle::*m_setter)(PassOwnPtr<ShadowData>, bool);
 720 };
 721
 722 class PropertyWrapperMaybeInvalidColor : public AnimationPropertyWrapperBase {
 723 public:
 724     PropertyWrapperMaybeInvalidColor(CSSPropertyID prop, Color (RenderStyle::*getter)() const, void (RenderStyle::*setter)(const Color&))
 725         : AnimationPropertyWrapperBase(prop)
 726         , m_getter(getter)
 727         , m_setter(setter)
 728     {
 729     }
 730
 731     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 732     {
 733         Color fromColor = (a->*m_getter)();
 734         Color toColor = (b->*m_getter)();
 735
 736         if (!fromColor.isValid() && !toColor.isValid())
 737             return true;
 738
 739         if (!fromColor.isValid())
 740             fromColor = a->color();
 741         if (!toColor.isValid())
 742             toColor = b->color();
 743
 744         return fromColor == toColor;
 745     }
 746
 747     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 748     {
 749         Color fromColor = (a->*m_getter)();
 750         Color toColor = (b->*m_getter)();
 751
 752         if (!fromColor.isValid() && !toColor.isValid())
 753             return;
 754
 755         if (!fromColor.isValid())
 756             fromColor = a->color();
 757         if (!toColor.isValid())
 758             toColor = b->color();
 759         (dst->*m_setter)(blendFunc(anim, fromColor, toColor, progress));
 760     }
 761
 762 private:
 763     Color (RenderStyle::*m_getter)() const;
 764     void (RenderStyle::*m_setter)(const Color&);
 765 };
 766
 767
 768 enum MaybeInvalidColorTag { MaybeInvalidColor };
 769 class PropertyWrapperVisitedAffectedColor : public AnimationPropertyWrapperBase {
 770 public:
 771     PropertyWrapperVisitedAffectedColor(CSSPropertyID prop, Color (RenderStyle::*getter)() const, void (RenderStyle::*setter)(const Color&),
 772                                         Color (RenderStyle::*visitedGetter)() const, void (RenderStyle::*visitedSetter)(const Color&))
 773         : AnimationPropertyWrapperBase(prop)
 774         , m_wrapper(adoptPtr(new PropertyWrapperColor(prop, getter, setter)))
 775         , m_visitedWrapper(adoptPtr(new PropertyWrapperColor(prop, visitedGetter, visitedSetter)))
 776     {
 777     }
 778     PropertyWrapperVisitedAffectedColor(CSSPropertyID prop, MaybeInvalidColorTag, Color (RenderStyle::*getter)() const, void (RenderStyle::*setter)(const Color&),
 779                                         Color (RenderStyle::*visitedGetter)() const, void (RenderStyle::*visitedSetter)(const Color&))
 780         : AnimationPropertyWrapperBase(prop)
 781         , m_wrapper(adoptPtr(new PropertyWrapperMaybeInvalidColor(prop, getter, setter)))
 782         , m_visitedWrapper(adoptPtr(new PropertyWrapperMaybeInvalidColor(prop, visitedGetter, visitedSetter)))
 783     {
 784     }
 785     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 786     {
 787         return m_wrapper->equals(a, b) && m_visitedWrapper->equals(a, b);
 788     }
 789     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 790     {
 791         m_wrapper->blend(anim, dst, a, b, progress);
 792         m_visitedWrapper->blend(anim, dst, a, b, progress);
 793     }
 794
 795 private:
 796     OwnPtr<AnimationPropertyWrapperBase> m_wrapper;
 797     OwnPtr<AnimationPropertyWrapperBase> m_visitedWrapper;
 798 };
 799
 800 // Wrapper base class for an animatable property in a FillLayer
 801 class FillLayerAnimationPropertyWrapperBase {
 802 public:
 803     FillLayerAnimationPropertyWrapperBase()
 804     {
 805     }
 806
 807     virtual ~FillLayerAnimationPropertyWrapperBase() { }
 808
 809     virtual bool equals(const FillLayer*, const FillLayer*) const = 0;
 810     virtual void blend(const AnimationBase*, FillLayer*, const FillLayer*, const FillLayer*, double) const = 0;
 811 };
 812
 813 template <typename T>
 814 class FillLayerPropertyWrapperGetter : public FillLayerAnimationPropertyWrapperBase {
 815     WTF_MAKE_NONCOPYABLE(FillLayerPropertyWrapperGetter);
 816 public:
 817     FillLayerPropertyWrapperGetter(T (FillLayer::*getter)() const)
 818         : m_getter(getter)
 819     {
 820     }
 821
 822     virtual bool equals(const FillLayer* a, const FillLayer* b) const
 823     {
 824        // If the style pointers are the same, don't bother doing the test.
 825        // If either is null, return false. If both are null, return true.
 826        if ((!a && !b) || a == b)
 827            return true;
 828        if (!a || !b)
 829             return false;
 830         return (a->*m_getter)() == (b->*m_getter)();
 831     }
 832
 833 protected:
 834     T (FillLayer::*m_getter)() const;
 835 };
 836
 837 template <typename T>
 838 class FillLayerPropertyWrapper : public FillLayerPropertyWrapperGetter<const T&> {
 839 public:
 840     FillLayerPropertyWrapper(const T& (FillLayer::*getter)() const, void (FillLayer::*setter)(T))
 841         : FillLayerPropertyWrapperGetter<const T&>(getter)
 842         , m_setter(setter)
 843     {
 844     }
 845
 846     virtual void blend(const AnimationBase* anim, FillLayer* dst, const FillLayer* a, const FillLayer* b, double progress) const
 847     {
 848         (dst->*m_setter)(blendFunc(anim, (a->*FillLayerPropertyWrapperGetter<const T&>::m_getter)(), (b->*FillLayerPropertyWrapperGetter<const T&>::m_getter)(), progress));
 849     }
 850
 851 protected:
 852     void (FillLayer::*m_setter)(T);
 853 };
 854
 855 template <typename T>
 856 class FillLayerRefCountedPropertyWrapper : public FillLayerPropertyWrapperGetter<T*> {
 857 public:
 858     FillLayerRefCountedPropertyWrapper(T* (FillLayer::*getter)() const, void (FillLayer::*setter)(PassRefPtr<T>))
 859         : FillLayerPropertyWrapperGetter<T*>(getter)
 860         , m_setter(setter)
 861     {
 862     }
 863
 864     virtual void blend(const AnimationBase* anim, FillLayer* dst, const FillLayer* a, const FillLayer* b, double progress) const
 865     {
 866         (dst->*m_setter)(blendFunc(anim, (a->*FillLayerPropertyWrapperGetter<T*>::m_getter)(), (b->*FillLayerPropertyWrapperGetter<T*>::m_getter)(), progress));
 867     }
 868
 869 protected:
 870     void (FillLayer::*m_setter)(PassRefPtr<T>);
 871 };
 872
 873 class FillLayerStyleImagePropertyWrapper : public FillLayerRefCountedPropertyWrapper<StyleImage> {
 874 public:
 875     FillLayerStyleImagePropertyWrapper(StyleImage* (FillLayer::*getter)() const, void (FillLayer::*setter)(PassRefPtr<StyleImage>))
 876         : FillLayerRefCountedPropertyWrapper<StyleImage>(getter, setter)
 877     {
 878     }
 879
 880     virtual bool equals(const FillLayer* a, const FillLayer* b) const
 881     {
 882        // If the style pointers are the same, don't bother doing the test.
 883        // If either is null, return false. If both are null, return true.
 884        if (a == b)
 885            return true;
 886        if (!a || !b)
 887             return false;
 888
 889         StyleImage* imageA = (a->*m_getter)();
 890         StyleImage* imageB = (b->*m_getter)();
 891         return StyleImage::imagesEquivalent(imageA, imageB);
 892     }
 893 };
 894
 895 class FillLayersPropertyWrapper : public AnimationPropertyWrapperBase {
 896 public:
 897     typedef const FillLayer* (RenderStyle::*LayersGetter)() const;
 898     typedef FillLayer* (RenderStyle::*LayersAccessor)();
 899
 900     FillLayersPropertyWrapper(CSSPropertyID prop, LayersGetter getter, LayersAccessor accessor)
 901         : AnimationPropertyWrapperBase(prop)
 902         , m_layersGetter(getter)
 903         , m_layersAccessor(accessor)
 904     {
 905         switch (prop) {
 906         case CSSPropertyBackgroundPositionX:
 907         case CSSPropertyWebkitMaskPositionX:
 908             m_fillLayerPropertyWrapper = new FillLayerPropertyWrapper<Length>(&FillLayer::xPosition, &FillLayer::setXPosition);
 909             break;
 910         case CSSPropertyBackgroundPositionY:
 911         case CSSPropertyWebkitMaskPositionY:
 912             m_fillLayerPropertyWrapper = new FillLayerPropertyWrapper<Length>(&FillLayer::yPosition, &FillLayer::setYPosition);
 913             break;
 914         case CSSPropertyBackgroundSize:
 915         case CSSPropertyWebkitBackgroundSize:
 916         case CSSPropertyWebkitMaskSize:
 917             m_fillLayerPropertyWrapper = new FillLayerPropertyWrapper<LengthSize>(&FillLayer::sizeLength, &FillLayer::setSizeLength);
 918             break;
 919         case CSSPropertyBackgroundImage:
 920             m_fillLayerPropertyWrapper = new FillLayerStyleImagePropertyWrapper(&FillLayer::image, &FillLayer::setImage);
 921             break;
 922         default:
 923             break;
 924         }
 925     }
 926
 927     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 928     {
 929         const FillLayer* fromLayer = (a->*m_layersGetter)();
 930         const FillLayer* toLayer = (b->*m_layersGetter)();
 931
 932         while (fromLayer && toLayer) {
 933             if (!m_fillLayerPropertyWrapper->equals(fromLayer, toLayer))
 934                 return false;
 935
 936             fromLayer = fromLayer->next();
 937             toLayer = toLayer->next();
 938         }
 939
 940         return true;
 941     }
 942
 943     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 944     {
 945         const FillLayer* aLayer = (a->*m_layersGetter)();
 946         const FillLayer* bLayer = (b->*m_layersGetter)();
 947         FillLayer* dstLayer = (dst->*m_layersAccessor)();
 948
 949         while (aLayer && bLayer && dstLayer) {
 950             m_fillLayerPropertyWrapper->blend(anim, dstLayer, aLayer, bLayer, progress);
 951             aLayer = aLayer->next();
 952             bLayer = bLayer->next();
 953             dstLayer = dstLayer->next();
 954         }
 955     }
 956
 957 private:
 958     FillLayerAnimationPropertyWrapperBase* m_fillLayerPropertyWrapper;
 959
 960     LayersGetter m_layersGetter;
 961     LayersAccessor m_layersAccessor;
 962 };
 963
 964 class ShorthandPropertyWrapper : public AnimationPropertyWrapperBase {
 965 public:
 966     ShorthandPropertyWrapper(CSSPropertyID property, Vector<AnimationPropertyWrapperBase*> longhandWrappers)
 967         : AnimationPropertyWrapperBase(property)
 968     {
 969         m_propertyWrappers.swap(longhandWrappers);
 970     }
 971
 972     virtual bool isShorthandWrapper() const { return true; }
 973
 974     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
 975     {
 976         Vector<AnimationPropertyWrapperBase*>::const_iterator end = m_propertyWrappers.end();
 977         for (Vector<AnimationPropertyWrapperBase*>::const_iterator it = m_propertyWrappers.begin(); it != end; ++it) {
 978             if (!(*it)->equals(a, b))
 979                 return false;
 980         }
 981         return true;
 982     }
 983
 984     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
 985     {
 986         Vector<AnimationPropertyWrapperBase*>::const_iterator end = m_propertyWrappers.end();
 987         for (Vector<AnimationPropertyWrapperBase*>::const_iterator it = m_propertyWrappers.begin(); it != end; ++it)
 988             (*it)->blend(anim, dst, a, b, progress);
 989     }
 990
 991     const Vector<AnimationPropertyWrapperBase*> propertyWrappers() const { return m_propertyWrappers; }
 992
 993 private:
 994     Vector<AnimationPropertyWrapperBase*> m_propertyWrappers;
 995 };
 996
 997 class PropertyWrapperFlex : public AnimationPropertyWrapperBase {
 998 public:
 999     PropertyWrapperFlex() : AnimationPropertyWrapperBase(CSSPropertyWebkitFlex)
1000     {
1001     }
1002
1003     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
1004     {
1005         // If the style pointers are the same, don't bother doing the test.
1006         // If either is null, return false. If both are null, return true.
1007         if ((!a && !b) || a == b)
1008             return true;
1009         if (!a || !b)
1010             return false;
1011
1012         return a->flexBasis() == b->flexBasis() && a->flexGrow() == b->flexGrow() && a->flexShrink() == b->flexShrink();
1013     }
1014
1015     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
1016     {
1017         dst->setFlexBasis(blendFunc(anim, a->flexBasis(), b->flexBasis(), progress));
1018         dst->setFlexGrow(blendFunc(anim, a->flexGrow(), b->flexGrow(), progress));
1019         dst->setFlexShrink(blendFunc(anim, a->flexShrink(), b->flexShrink(), progress));
1020     }
1021 };
1022
1023 #if ENABLE(SVG)
1024 class PropertyWrapperSVGPaint : public AnimationPropertyWrapperBase {
1025 public:
1026     PropertyWrapperSVGPaint(CSSPropertyID prop, const SVGPaint::SVGPaintType& (RenderStyle::*paintTypeGetter)() const, Color (RenderStyle::*getter)() const, void (RenderStyle::*setter)(const Color&))
1027         : AnimationPropertyWrapperBase(prop)
1028         , m_paintTypeGetter(paintTypeGetter)
1029         , m_getter(getter)
1030         , m_setter(setter)
1031     {
1032     }
1033
1034     virtual bool equals(const RenderStyle* a, const RenderStyle* b) const
1035     {
1036         if ((a->*m_paintTypeGetter)() != (b->*m_paintTypeGetter)())
1037             return false;
1038
1039         // We only support animations between SVGPaints that are pure Color values.
1040         // For everything else we must return true for this method, otherwise
1041         // we will try to animate between values forever.
1042         if ((a->*m_paintTypeGetter)() == SVGPaint::SVG_PAINTTYPE_RGBCOLOR) {
1043             Color fromColor = (a->*m_getter)();
1044             Color toColor = (b->*m_getter)();
1045
1046             if (!fromColor.isValid() && !toColor.isValid())
1047                 return true;
1048
1049             if (!fromColor.isValid())
1050                 fromColor = Color();
1051             if (!toColor.isValid())
1052                 toColor = Color();
1053
1054             return fromColor == toColor;
1055         }
1056         return true;
1057     }
1058
1059     virtual void blend(const AnimationBase* anim, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress) const
1060     {
1061         if ((a->*m_paintTypeGetter)() != SVGPaint::SVG_PAINTTYPE_RGBCOLOR
1062             || (b->*m_paintTypeGetter)() != SVGPaint::SVG_PAINTTYPE_RGBCOLOR)
1063             return;
1064
1065         Color fromColor = (a->*m_getter)();
1066         Color toColor = (b->*m_getter)();
1067
1068         if (!fromColor.isValid() && !toColor.isValid())
1069             return;
1070
1071         if (!fromColor.isValid())
1072             fromColor = Color();
1073         if (!toColor.isValid())
1074             toColor = Color();
1075         (dst->*m_setter)(blendFunc(anim, fromColor, toColor, progress));
1076     }
1077
1078 private:
1079     const SVGPaint::SVGPaintType& (RenderStyle::*m_paintTypeGetter)() const;
1080     Color (RenderStyle::*m_getter)() const;
1081     void (RenderStyle::*m_setter)(const Color&);
1082 };
1083 #endif
1084
1085 class CSSPropertyAnimationWrapperMap {
1086 public:
1087     static CSSPropertyAnimationWrapperMap& instance()
1088     {
1089         // FIXME: This data is never destroyed. Maybe we should ref count it and toss it when the last AnimationController is destroyed?
1090         DEFINE_STATIC_LOCAL(OwnPtr<CSSPropertyAnimationWrapperMap>, map, ());
1091         if (!map)
1092             map = adoptPtr(new CSSPropertyAnimationWrapperMap);
1093         return *map;
1094     }
1095
1096     AnimationPropertyWrapperBase* wrapperForProperty(CSSPropertyID propertyID)
1097     {
1098         if (propertyID < firstCSSProperty || propertyID > lastCSSProperty)
1099             return 0;
1100
1101         unsigned wrapperIndex = indexFromPropertyID(propertyID);
1102         if (wrapperIndex == cInvalidPropertyWrapperIndex)
1103             return 0;
1104
1105         return m_propertyWrappers[wrapperIndex].get();
1106     }
1107
1108     AnimationPropertyWrapperBase* wrapperForIndex(unsigned index)
1109     {
1110         ASSERT(index < m_propertyWrappers.size());
1111         return m_propertyWrappers[index].get();
1112     }
1113
1114     unsigned size()
1115     {
1116         return m_propertyWrappers.size();
1117     }
1118
1119 private:
1120     CSSPropertyAnimationWrapperMap();
1121     unsigned char& indexFromPropertyID(CSSPropertyID propertyID)
1122     {
1123         return m_propertyToIdMap[propertyID - firstCSSProperty];
1124     }
1125
1126     Vector<OwnPtr<AnimationPropertyWrapperBase>> m_propertyWrappers;
1127     unsigned char m_propertyToIdMap[numCSSProperties];
1128
1129     static const unsigned char cInvalidPropertyWrapperIndex = UCHAR_MAX;
1130 };
1131
1132 CSSPropertyAnimationWrapperMap::CSSPropertyAnimationWrapperMap()
1133 {
1134     // build the list of property wrappers to do the comparisons and blends
1135     AnimationPropertyWrapperBase* animatableLonghandPropertyWrappers[] = {
1136         new LengthPropertyWrapper<Length>(CSSPropertyLeft, &RenderStyle::left, &RenderStyle::setLeft),
1137         new LengthPropertyWrapper<Length>(CSSPropertyRight, &RenderStyle::right, &RenderStyle::setRight),
1138         new LengthPropertyWrapper<Length>(CSSPropertyTop, &RenderStyle::top, &RenderStyle::setTop),
1139         new LengthPropertyWrapper<Length>(CSSPropertyBottom, &RenderStyle::bottom, &RenderStyle::setBottom),
1140
1141         new LengthPropertyWrapper<Length>(CSSPropertyWidth, &RenderStyle::width, &RenderStyle::setWidth),
1142         new LengthPropertyWrapper<Length>(CSSPropertyMinWidth, &RenderStyle::minWidth, &RenderStyle::setMinWidth),
1143         new LengthPropertyWrapper<Length>(CSSPropertyMaxWidth, &RenderStyle::maxWidth, &RenderStyle::setMaxWidth),
1144
1145         new LengthPropertyWrapper<Length>(CSSPropertyHeight, &RenderStyle::height, &RenderStyle::setHeight),
1146         new LengthPropertyWrapper<Length>(CSSPropertyMinHeight, &RenderStyle::minHeight, &RenderStyle::setMinHeight),
1147         new LengthPropertyWrapper<Length>(CSSPropertyMaxHeight, &RenderStyle::maxHeight, &RenderStyle::setMaxHeight),
1148
1149         new PropertyWrapperFlex(),
1150
1151         new PropertyWrapper<unsigned>(CSSPropertyBorderLeftWidth, &RenderStyle::borderLeftWidth, &RenderStyle::setBorderLeftWidth),
1152         new PropertyWrapper<unsigned>(CSSPropertyBorderRightWidth, &RenderStyle::borderRightWidth, &RenderStyle::setBorderRightWidth),
1153         new PropertyWrapper<unsigned>(CSSPropertyBorderTopWidth, &RenderStyle::borderTopWidth, &RenderStyle::setBorderTopWidth),
1154         new PropertyWrapper<unsigned>(CSSPropertyBorderBottomWidth, &RenderStyle::borderBottomWidth, &RenderStyle::setBorderBottomWidth),
1155         new LengthPropertyWrapper<Length>(CSSPropertyMarginLeft, &RenderStyle::marginLeft, &RenderStyle::setMarginLeft),
1156         new LengthPropertyWrapper<Length>(CSSPropertyMarginRight, &RenderStyle::marginRight, &RenderStyle::setMarginRight),
1157         new LengthPropertyWrapper<Length>(CSSPropertyMarginTop, &RenderStyle::marginTop, &RenderStyle::setMarginTop),
1158         new LengthPropertyWrapper<Length>(CSSPropertyMarginBottom, &RenderStyle::marginBottom, &RenderStyle::setMarginBottom),
1159         new LengthPropertyWrapper<Length>(CSSPropertyPaddingLeft, &RenderStyle::paddingLeft, &RenderStyle::setPaddingLeft),
1160         new LengthPropertyWrapper<Length>(CSSPropertyPaddingRight, &RenderStyle::paddingRight, &RenderStyle::setPaddingRight),
1161         new LengthPropertyWrapper<Length>(CSSPropertyPaddingTop, &RenderStyle::paddingTop, &RenderStyle::setPaddingTop),
1162         new LengthPropertyWrapper<Length>(CSSPropertyPaddingBottom, &RenderStyle::paddingBottom, &RenderStyle::setPaddingBottom),
1163         new PropertyWrapperVisitedAffectedColor(CSSPropertyColor, &RenderStyle::color, &RenderStyle::setColor, &RenderStyle::visitedLinkColor, &RenderStyle::setVisitedLinkColor),
1164
1165         new PropertyWrapperVisitedAffectedColor(CSSPropertyBackgroundColor, &RenderStyle::backgroundColor, &RenderStyle::setBackgroundColor, &RenderStyle::visitedLinkBackgroundColor, &RenderStyle::setVisitedLinkBackgroundColor),
1166
1167         new FillLayersPropertyWrapper(CSSPropertyBackgroundImage, &RenderStyle::backgroundLayers, &RenderStyle::accessBackgroundLayers),
1168         new StyleImagePropertyWrapper(CSSPropertyListStyleImage, &RenderStyle::listStyleImage, &RenderStyle::setListStyleImage),
1169         new StyleImagePropertyWrapper(CSSPropertyWebkitMaskImage, &RenderStyle::maskImage, &RenderStyle::setMaskImage),
1170
1171         new StyleImagePropertyWrapper(CSSPropertyBorderImageSource, &RenderStyle::borderImageSource, &RenderStyle::setBorderImageSource),
1172         new LengthPropertyWrapper<LengthBox>(CSSPropertyBorderImageSlice, &RenderStyle::borderImageSlices, &RenderStyle::setBorderImageSlices),
1173         new LengthPropertyWrapper<LengthBox>(CSSPropertyBorderImageWidth, &RenderStyle::borderImageWidth, &RenderStyle::setBorderImageWidth),
1174         new LengthPropertyWrapper<LengthBox>(CSSPropertyBorderImageOutset, &RenderStyle::borderImageOutset, &RenderStyle::setBorderImageOutset),
1175
1176         new StyleImagePropertyWrapper(CSSPropertyWebkitMaskBoxImageSource, &RenderStyle::maskBoxImageSource, &RenderStyle::setMaskBoxImageSource),
1177         new PropertyWrapper<const NinePieceImage&>(CSSPropertyWebkitMaskBoxImage, &RenderStyle::maskBoxImage, &RenderStyle::setMaskBoxImage),
1178
1179         new FillLayersPropertyWrapper(CSSPropertyBackgroundPositionX, &RenderStyle::backgroundLayers, &RenderStyle::accessBackgroundLayers),
1180         new FillLayersPropertyWrapper(CSSPropertyBackgroundPositionY, &RenderStyle::backgroundLayers, &RenderStyle::accessBackgroundLayers),
1181         new FillLayersPropertyWrapper(CSSPropertyBackgroundSize, &RenderStyle::backgroundLayers, &RenderStyle::accessBackgroundLayers),
1182         new FillLayersPropertyWrapper(CSSPropertyWebkitBackgroundSize, &RenderStyle::backgroundLayers, &RenderStyle::accessBackgroundLayers),
1183
1184         new FillLayersPropertyWrapper(CSSPropertyWebkitMaskPositionX, &RenderStyle::maskLayers, &RenderStyle::accessMaskLayers),
1185         new FillLayersPropertyWrapper(CSSPropertyWebkitMaskPositionY, &RenderStyle::maskLayers, &RenderStyle::accessMaskLayers),
1186         new FillLayersPropertyWrapper(CSSPropertyWebkitMaskSize, &RenderStyle::maskLayers, &RenderStyle::accessMaskLayers),
1187
1188         new PropertyWrapper<float>(CSSPropertyFontSize,
1189             // Must pass a specified size to setFontSize if Text Autosizing is enabled, but a computed size
1190             // if text zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).
1191             // FIXME: Find some way to assert that text zoom isn't activated when Text Autosizing is compiled in.
1192 #if ENABLE(TEXT_AUTOSIZING)
1193             &RenderStyle::specifiedFontSize,
1194 #else
1195             &RenderStyle::computedFontSize,
1196 #endif
1197             &RenderStyle::setFontSize),
1198         new PropertyWrapper<unsigned short>(CSSPropertyWebkitColumnRuleWidth, &RenderStyle::columnRuleWidth, &RenderStyle::setColumnRuleWidth),
1199         new PropertyWrapper<float>(CSSPropertyWebkitColumnGap, &RenderStyle::columnGap, &RenderStyle::setColumnGap),
1200         new PropertyWrapper<unsigned short>(CSSPropertyWebkitColumnCount, &RenderStyle::columnCount, &RenderStyle::setColumnCount),
1201         new PropertyWrapper<float>(CSSPropertyWebkitColumnWidth, &RenderStyle::columnWidth, &RenderStyle::setColumnWidth),
1202         new PropertyWrapper<short>(CSSPropertyWebkitBorderHorizontalSpacing, &RenderStyle::horizontalBorderSpacing, &RenderStyle::setHorizontalBorderSpacing),
1203         new PropertyWrapper<short>(CSSPropertyWebkitBorderVerticalSpacing, &RenderStyle::verticalBorderSpacing, &RenderStyle::setVerticalBorderSpacing),
1204         new PropertyWrapper<int>(CSSPropertyZIndex, &RenderStyle::zIndex, &RenderStyle::setZIndex),
1205         new PropertyWrapper<short>(CSSPropertyOrphans, &RenderStyle::orphans, &RenderStyle::setOrphans),
1206         new PropertyWrapper<short>(CSSPropertyWidows, &RenderStyle::widows, &RenderStyle::setWidows),
1207         new LengthPropertyWrapper<Length>(CSSPropertyLineHeight, &RenderStyle::specifiedLineHeight, &RenderStyle::setLineHeight),
1208         new PropertyWrapper<int>(CSSPropertyOutlineOffset, &RenderStyle::outlineOffset, &RenderStyle::setOutlineOffset),
1209         new PropertyWrapper<unsigned short>(CSSPropertyOutlineWidth, &RenderStyle::outlineWidth, &RenderStyle::setOutlineWidth),
1210         new PropertyWrapper<int>(CSSPropertyLetterSpacing, &RenderStyle::letterSpacing, &RenderStyle::setLetterSpacing),
1211         new PropertyWrapper<int>(CSSPropertyWordSpacing, &RenderStyle::wordSpacing, &RenderStyle::setWordSpacing),
1212         new LengthPropertyWrapper<Length>(CSSPropertyTextIndent, &RenderStyle::textIndent, &RenderStyle::setTextIndent),
1213
1214         new PropertyWrapper<float>(CSSPropertyWebkitPerspective, &RenderStyle::perspective, &RenderStyle::setPerspective),
1215         new LengthPropertyWrapper<Length>(CSSPropertyWebkitPerspectiveOriginX, &RenderStyle::perspectiveOriginX, &RenderStyle::setPerspectiveOriginX),
1216         new LengthPropertyWrapper<Length>(CSSPropertyWebkitPerspectiveOriginY, &RenderStyle::perspectiveOriginY, &RenderStyle::setPerspectiveOriginY),
1217         new LengthPropertyWrapper<Length>(CSSPropertyWebkitTransformOriginX, &RenderStyle::transformOriginX, &RenderStyle::setTransformOriginX),
1218         new LengthPropertyWrapper<Length>(CSSPropertyWebkitTransformOriginY, &RenderStyle::transformOriginY, &RenderStyle::setTransformOriginY),
1219         new PropertyWrapper<float>(CSSPropertyWebkitTransformOriginZ, &RenderStyle::transformOriginZ, &RenderStyle::setTransformOriginZ),
1220         new LengthPropertyWrapper<LengthSize>(CSSPropertyBorderTopLeftRadius, &RenderStyle::borderTopLeftRadius, &RenderStyle::setBorderTopLeftRadius),
1221         new LengthPropertyWrapper<LengthSize>(CSSPropertyBorderTopRightRadius, &RenderStyle::borderTopRightRadius, &RenderStyle::setBorderTopRightRadius),
1222         new LengthPropertyWrapper<LengthSize>(CSSPropertyBorderBottomLeftRadius, &RenderStyle::borderBottomLeftRadius, &RenderStyle::setBorderBottomLeftRadius),
1223         new LengthPropertyWrapper<LengthSize>(CSSPropertyBorderBottomRightRadius, &RenderStyle::borderBottomRightRadius, &RenderStyle::setBorderBottomRightRadius),
1224         new PropertyWrapper<EVisibility>(CSSPropertyVisibility, &RenderStyle::visibility, &RenderStyle::setVisibility),
1225         new PropertyWrapper<float>(CSSPropertyZoom, &RenderStyle::zoom, &RenderStyle::setZoomWithoutReturnValue),
1226
1227         new LengthPropertyWrapper<LengthBox>(CSSPropertyClip, &RenderStyle::clip, &RenderStyle::setClip),
1228
1229 #if USE(ACCELERATED_COMPOSITING)
1230         new PropertyWrapperAcceleratedOpacity(),
1231         new PropertyWrapperAcceleratedTransform(),
1232 #if ENABLE(CSS_FILTERS)
1233         new PropertyWrapperAcceleratedFilter(),
1234 #endif
1235 #else
1236         new PropertyWrapper<float>(CSSPropertyOpacity, &RenderStyle::opacity, &RenderStyle::setOpacity),
1237         new PropertyWrapper<const TransformOperations&>(CSSPropertyWebkitTransform, &RenderStyle::transform, &RenderStyle::setTransform),
1238 #if ENABLE(CSS_FILTERS)
1239         new PropertyWrapper<const FilterOperations&>(CSSPropertyWebkitFilter, &RenderStyle::filter, &RenderStyle::setFilter),
1240 #endif
1241 #endif
1242
1243         new PropertyWrapperClipPath(CSSPropertyWebkitClipPath, &RenderStyle::clipPath, &RenderStyle::setClipPath),
1244
1245 #if ENABLE(CSS_SHAPES)
1246         new PropertyWrapperShape(CSSPropertyWebkitShapeInside, &RenderStyle::shapeInside, &RenderStyle::setShapeInside),
1247         new PropertyWrapperShape(CSSPropertyWebkitShapeOutside, &RenderStyle::shapeOutside, &RenderStyle::setShapeOutside),
1248         new LengthPropertyWrapper<Length>(CSSPropertyWebkitShapeMargin, &RenderStyle::shapeMargin, &RenderStyle::setShapeMargin),
1249         new PropertyWrapper<float>(CSSPropertyWebkitShapeImageThreshold, &RenderStyle::shapeImageThreshold, &RenderStyle::setShapeImageThreshold),
1250 #endif
1251
1252         new PropertyWrapperVisitedAffectedColor(CSSPropertyWebkitColumnRuleColor, MaybeInvalidColor, &RenderStyle::columnRuleColor, &RenderStyle::setColumnRuleColor, &RenderStyle::visitedLinkColumnRuleColor, &RenderStyle::setVisitedLinkColumnRuleColor),
1253         new PropertyWrapperVisitedAffectedColor(CSSPropertyWebkitTextStrokeColor, MaybeInvalidColor, &RenderStyle::textStrokeColor, &RenderStyle::setTextStrokeColor, &RenderStyle::visitedLinkTextStrokeColor, &RenderStyle::setVisitedLinkTextStrokeColor),
1254         new PropertyWrapperVisitedAffectedColor(CSSPropertyWebkitTextFillColor, MaybeInvalidColor, &RenderStyle::textFillColor, &RenderStyle::setTextFillColor, &RenderStyle::visitedLinkTextFillColor, &RenderStyle::setVisitedLinkTextFillColor),
1255         new PropertyWrapperVisitedAffectedColor(CSSPropertyBorderLeftColor, MaybeInvalidColor, &RenderStyle::borderLeftColor, &RenderStyle::setBorderLeftColor, &RenderStyle::visitedLinkBorderLeftColor, &RenderStyle::setVisitedLinkBorderLeftColor),
1256         new PropertyWrapperVisitedAffectedColor(CSSPropertyBorderRightColor, MaybeInvalidColor, &RenderStyle::borderRightColor, &RenderStyle::setBorderRightColor, &RenderStyle::visitedLinkBorderRightColor, &RenderStyle::setVisitedLinkBorderRightColor),
1257         new PropertyWrapperVisitedAffectedColor(CSSPropertyBorderTopColor, MaybeInvalidColor, &RenderStyle::borderTopColor, &RenderStyle::setBorderTopColor, &RenderStyle::visitedLinkBorderTopColor, &RenderStyle::setVisitedLinkBorderTopColor),
1258         new PropertyWrapperVisitedAffectedColor(CSSPropertyBorderBottomColor, MaybeInvalidColor, &RenderStyle::borderBottomColor, &RenderStyle::setBorderBottomColor, &RenderStyle::visitedLinkBorderBottomColor, &RenderStyle::setVisitedLinkBorderBottomColor),
1259         new PropertyWrapperVisitedAffectedColor(CSSPropertyOutlineColor, MaybeInvalidColor, &RenderStyle::outlineColor, &RenderStyle::setOutlineColor, &RenderStyle::visitedLinkOutlineColor, &RenderStyle::setVisitedLinkOutlineColor),
1260
1261         new PropertyWrapperShadow(CSSPropertyBoxShadow, &RenderStyle::boxShadow, &RenderStyle::setBoxShadow),
1262         new PropertyWrapperShadow(CSSPropertyWebkitBoxShadow, &RenderStyle::boxShadow, &RenderStyle::setBoxShadow),
1263         new PropertyWrapperShadow(CSSPropertyTextShadow, &RenderStyle::textShadow, &RenderStyle::setTextShadow),
1264
1265 #if ENABLE(SVG)
1266         new PropertyWrapperSVGPaint(CSSPropertyFill, &RenderStyle::fillPaintType, &RenderStyle::fillPaintColor, &RenderStyle::setFillPaintColor),
1267         new PropertyWrapper<float>(CSSPropertyFillOpacity, &RenderStyle::fillOpacity, &RenderStyle::setFillOpacity),
1268
1269         new PropertyWrapperSVGPaint(CSSPropertyStroke, &RenderStyle::strokePaintType, &RenderStyle::strokePaintColor, &RenderStyle::setStrokePaintColor),
1270         new PropertyWrapper<float>(CSSPropertyStrokeOpacity, &RenderStyle::strokeOpacity, &RenderStyle::setStrokeOpacity),
1271         new PropertyWrapper<SVGLength>(CSSPropertyStrokeWidth, &RenderStyle::strokeWidth, &RenderStyle::setStrokeWidth),
1272         new PropertyWrapper< Vector<SVGLength>>(CSSPropertyStrokeDasharray, &RenderStyle::strokeDashArray, &RenderStyle::setStrokeDashArray),
1273         new PropertyWrapper<SVGLength>(CSSPropertyStrokeDashoffset, &RenderStyle::strokeDashOffset, &RenderStyle::setStrokeDashOffset),
1274         new PropertyWrapper<float>(CSSPropertyStrokeMiterlimit, &RenderStyle::strokeMiterLimit, &RenderStyle::setStrokeMiterLimit),
1275
1276         new PropertyWrapper<float>(CSSPropertyFloodOpacity, &RenderStyle::floodOpacity, &RenderStyle::setFloodOpacity),
1277         new PropertyWrapperMaybeInvalidColor(CSSPropertyFloodColor, &RenderStyle::floodColor, &RenderStyle::setFloodColor),
1278
1279         new PropertyWrapper<float>(CSSPropertyStopOpacity, &RenderStyle::stopOpacity, &RenderStyle::setStopOpacity),
1280         new PropertyWrapperMaybeInvalidColor(CSSPropertyStopColor, &RenderStyle::stopColor, &RenderStyle::setStopColor),
1281
1282         new PropertyWrapperMaybeInvalidColor(CSSPropertyLightingColor, &RenderStyle::lightingColor, &RenderStyle::setLightingColor),
1283
1284         new PropertyWrapper<SVGLength>(CSSPropertyBaselineShift, &RenderStyle::baselineShiftValue, &RenderStyle::setBaselineShiftValue),
1285         new PropertyWrapper<SVGLength>(CSSPropertyKerning, &RenderStyle::kerning, &RenderStyle::setKerning),
1286 #endif
1287     };
1288     const unsigned animatableLonghandPropertiesCount = WTF_ARRAY_LENGTH(animatableLonghandPropertyWrappers);
1289
1290     static const CSSPropertyID animatableShorthandProperties[] = {
1291         CSSPropertyBackground, // for background-color, background-position, background-image
1292         CSSPropertyBackgroundPosition,
1293         CSSPropertyFont, // for font-size, font-weight
1294         CSSPropertyWebkitMask, // for mask-position
1295         CSSPropertyWebkitMaskPosition,
1296         CSSPropertyBorderTop, CSSPropertyBorderRight, CSSPropertyBorderBottom, CSSPropertyBorderLeft,
1297         CSSPropertyBorderColor,
1298         CSSPropertyBorderRadius,
1299         CSSPropertyBorderWidth,
1300         CSSPropertyBorder,
1301         CSSPropertyBorderImage,
1302         CSSPropertyBorderSpacing,
1303         CSSPropertyListStyle, // for list-style-image
1304         CSSPropertyMargin,
1305         CSSPropertyOutline,
1306         CSSPropertyPadding,
1307         CSSPropertyWebkitTextStroke,
1308         CSSPropertyWebkitColumnRule,
1309         CSSPropertyWebkitBorderRadius,
1310         CSSPropertyWebkitTransformOrigin
1311     };
1312     const unsigned animatableShorthandPropertiesCount = WTF_ARRAY_LENGTH(animatableShorthandProperties);
1313
1314     // TODO:
1315     //
1316     //  CSSPropertyVerticalAlign
1317     //
1318     // Compound properties that have components that should be animatable:
1319     //
1320     //  CSSPropertyWebkitColumns
1321     //  CSSPropertyWebkitBoxReflect
1322
1323     // Make sure unused slots have a value
1324     for (int i = 0; i < numCSSProperties; ++i)
1325         m_propertyToIdMap[i] = cInvalidPropertyWrapperIndex;
1326
1327     COMPILE_ASSERT(animatableLonghandPropertiesCount + animatableShorthandPropertiesCount < UCHAR_MAX, numberOfAnimatablePropertiesMustBeLessThanUCharMax);
1328     m_propertyWrappers.reserveInitialCapacity(animatableLonghandPropertiesCount + animatableShorthandPropertiesCount);
1329
1330     // First we put the non-shorthand property wrappers into the map, so the shorthand-building
1331     // code can find them.
1332
1333     for (unsigned i = 0; i < animatableLonghandPropertiesCount; ++i) {
1334         AnimationPropertyWrapperBase* wrapper = animatableLonghandPropertyWrappers[i];
1335         m_propertyWrappers.uncheckedAppend(adoptPtr(wrapper));
1336         indexFromPropertyID(wrapper->property()) = i;
1337     }
1338
1339     for (size_t i = 0; i < animatableShorthandPropertiesCount; ++i) {
1340         CSSPropertyID propertyID = animatableShorthandProperties[i];
1341         StylePropertyShorthand shorthand = shorthandForProperty(propertyID);
1342         if (!shorthand.length())
1343             continue;
1344
1345         Vector<AnimationPropertyWrapperBase*> longhandWrappers;
1346         longhandWrappers.reserveInitialCapacity(shorthand.length());
1347         const CSSPropertyID* properties = shorthand.properties();
1348         for (unsigned j = 0; j < shorthand.length(); ++j) {
1349             unsigned wrapperIndex = indexFromPropertyID(properties[j]);
1350             if (wrapperIndex == cInvalidPropertyWrapperIndex)
1351                 continue;
1352             ASSERT(m_propertyWrappers[wrapperIndex]);
1353             longhandWrappers.uncheckedAppend(m_propertyWrappers[wrapperIndex].get());
1354         }
1355
1356         m_propertyWrappers.uncheckedAppend(adoptPtr(new ShorthandPropertyWrapper(propertyID, longhandWrappers)));
1357         indexFromPropertyID(propertyID) = animatableLonghandPropertiesCount + i;
1358     }
1359 }
1360
1361 static bool gatherEnclosingShorthandProperties(CSSPropertyID property, AnimationPropertyWrapperBase* wrapper, HashSet<CSSPropertyID>& propertySet)
1362 {
1363     if (!wrapper->isShorthandWrapper())
1364         return false;
1365
1366     ShorthandPropertyWrapper* shorthandWrapper = static_cast<ShorthandPropertyWrapper*>(wrapper);
1367
1368     bool contained = false;
1369     for (size_t i = 0; i < shorthandWrapper->propertyWrappers().size(); ++i) {
1370         AnimationPropertyWrapperBase* currWrapper = shorthandWrapper->propertyWrappers()[i];
1371
1372         if (gatherEnclosingShorthandProperties(property, currWrapper, propertySet) || currWrapper->property() == property)
1373             contained = true;
1374     }
1375
1376     if (contained)
1377         propertySet.add(wrapper->property());
1378
1379     return contained;
1380 }
1381
1382 // Returns true if we need to start animation timers
1383 bool CSSPropertyAnimation::blendProperties(const AnimationBase* anim, CSSPropertyID prop, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress)
1384 {
1385     ASSERT(prop != CSSPropertyInvalid);
1386
1387     AnimationPropertyWrapperBase* wrapper = CSSPropertyAnimationWrapperMap::instance().wrapperForProperty(prop);
1388     if (wrapper) {
1389         wrapper->blend(anim, dst, a, b, progress);
1390 #if USE(ACCELERATED_COMPOSITING)
1391         return !wrapper->animationIsAccelerated() || !anim->isAccelerated();
1392 #else
1393         return true;
1394 #endif
1395     }
1396
1397     return false;
1398 }
1399
1400 #if USE(ACCELERATED_COMPOSITING)
1401 bool CSSPropertyAnimation::animationOfPropertyIsAccelerated(CSSPropertyID prop)
1402 {
1403     AnimationPropertyWrapperBase* wrapper = CSSPropertyAnimationWrapperMap::instance().wrapperForProperty(prop);
1404     return wrapper ? wrapper->animationIsAccelerated() : false;
1405 }
1406 #endif
1407
1408 // Note: this is inefficient. It's only called from pauseTransitionAtTime().
1409 HashSet<CSSPropertyID> CSSPropertyAnimation::animatableShorthandsAffectingProperty(CSSPropertyID property)
1410 {
1411     CSSPropertyAnimationWrapperMap& map = CSSPropertyAnimationWrapperMap::instance();
1412
1413     HashSet<CSSPropertyID> foundProperties;
1414     for (unsigned i = 0; i < map.size(); ++i)
1415         gatherEnclosingShorthandProperties(property, map.wrapperForIndex(i), foundProperties);
1416
1417     return foundProperties;
1418 }
1419
1420 bool CSSPropertyAnimation::propertiesEqual(CSSPropertyID prop, const RenderStyle* a, const RenderStyle* b)
1421 {
1422     AnimationPropertyWrapperBase* wrapper = CSSPropertyAnimationWrapperMap::instance().wrapperForProperty(prop);
1423     if (wrapper)
1424         return wrapper->equals(a, b);
1425     return true;
1426 }
1427
1428 CSSPropertyID CSSPropertyAnimation::getPropertyAtIndex(int i, bool& isShorthand)
1429 {
1430     CSSPropertyAnimationWrapperMap& map = CSSPropertyAnimationWrapperMap::instance();
1431
1432     if (i < 0 || static_cast<unsigned>(i) >= map.size())
1433         return CSSPropertyInvalid;
1434
1435     AnimationPropertyWrapperBase* wrapper = map.wrapperForIndex(i);
1436     isShorthand = wrapper->isShorthandWrapper();
1437     return wrapper->property();
1438 }
1439
1440 int CSSPropertyAnimation::getNumProperties()
1441 {
1442     return CSSPropertyAnimationWrapperMap::instance().size();
1443 }
1444
1445 }