Add FractionalLayoutUnit version of blend to AnimationUtilities

https://bugs.webkit.org/show_bug.cgi?id=81572

Reviewed by Eric Seidel.

Add version of blend method that operates on FractionalLayoutUnits. This
will be used in place of the integer version in many places once we
enable support for subpixel layout.

No new tests.

* platform/FractionalLayoutUnit.h:
Include math.h to make GTK build happy.

* platform/animation/AnimationUtilities.h:
(WebCore::blend):


Canonical link: https://commits.webkit.org/98884@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@111362 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/ChangeLog

@@ -1,3 +1,22 @@
+2012-03-19  Emil A Eklund  <eae@chromium.org>
+
+        Add FractionalLayoutUnit version of blend to AnimationUtilities
+        https://bugs.webkit.org/show_bug.cgi?id=81572
+
+        Reviewed by Eric Seidel.
+
+        Add version of blend method that operates on FractionalLayoutUnits. This
+        will be used in place of the integer version in many places once we
+        enable support for subpixel layout.
+
+        No new tests.
+
+        * platform/FractionalLayoutUnit.h:
+        Include math.h to make GTK build happy.
+
+        * platform/animation/AnimationUtilities.h:
+        (WebCore::blend):
+
 2012-03-19  Adam Barth  <abarth@webkit.org>
 
         Remove support for "magic" iframe

Source/WebCore/platform/FractionalLayoutUnit.h

@@ -33,6 +33,7 @@
 
 #include <limits.h>
 #include <limits>
+#include <math.h>
 #include <stdlib.h>
 
 namespace WebCore {

Source/WebCore/platform/animation/AnimationUtilities.h

@@ -26,6 +26,7 @@
 #ifndef AnimationUtilities_h
 #define AnimationUtilities_h
 
+#include "FractionalLayoutUnit.h"
 #include <wtf/MathExtras.h>
 
 namespace WebCore {
@@ -50,6 +51,11 @@ inline float blend(float from, float to, double progress)
     return static_cast<float>(from + (to - from) * progress);
 }
 
+inline FractionalLayoutUnit blend(FractionalLayoutUnit from, FractionalLayoutUnit to, double progress)
+{  
+    return from + (to - from) * progress;
+}
+
 } // namespace WebCore
 
 #endif // AnimationUtilities_h