text: /*
   * Copyright (C) 2007 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer. 
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution. 
   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
   *     its contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission. 
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include "CSSPropertyNames.h"
  #include <wtf/HashSet.h>
  
  namespace WebCore {
  
  class CSSPropertyBlendingClient;
  class RenderStyle;
  
  class CSSPropertyAnimation {
  public:
      static bool isPropertyAnimatable(CSSPropertyID);
      static bool animationOfPropertyIsAccelerated(CSSPropertyID);
      static bool propertiesEqual(CSSPropertyID, const RenderStyle* a, const RenderStyle* b);
      static bool canPropertyBeInterpolated(CSSPropertyID, const RenderStyle* a, const RenderStyle* b);
      static CSSPropertyID getPropertyAtIndex(int, Optional<bool>& isShorthand);
      static int getNumProperties();
  
      static HashSet<CSSPropertyID> animatableShorthandsAffectingProperty(CSSPropertyID);
  
      // Return true if we need to start software animation timers
      static void blendProperties(const CSSPropertyBlendingClient*, CSSPropertyID, RenderStyle* dst, const RenderStyle* a, const RenderStyle* b, double progress);
  };
  
  } // namespace WebCore
  