Support subpixel values for text-shadow and box-shadow

Source/platform/animation/AnimationUtilities.h

 /*
  * Copyright (C) 2011 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
@@ skipping 10 matching lines @@
  * 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.
  */
 
 #ifndef AnimationUtilities_h
 #define AnimationUtilities_h
 
 #include "platform/LayoutUnit.h"
 #include "platform/PlatformExport.h"
+#include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntPoint.h"
 #include "wtf/MathExtras.h"
 #include "wtf/TypeTraits.h"
 
 namespace WebCore {
 
 inline int blend(int from, int to, double progress)
 {
     return lround(from + (to - from) * progress);
 }
@@ skipping 19 matching lines @@
 inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress)
 {
     return from + (to - from) * progress;
 }
 
 inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress)
 {
     return IntPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress));
 }
 
+inline FloatPoint blend(const FloatPoint& from, const FloatPoint& to, double progress)
+{
+    return FloatPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress));
+}
+
 // Calculates the accuracy for evaluating a timing function for an animation with the specified duration.
 inline double accuracyForDuration(double duration)
 {
     return 1.0 / (200.0 * duration);
 }
 
 } // namespace WebCore
 
 #endif // AnimationUtilities_h