Make font-weight animatable.

Source/core/css/resolver/AnimatedStyleBuilder.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 207 matching lines @@
         case CSSPropertyWebkitMaskSize:
             fillLayer->clearSize();
             break;
         default:
             ASSERT_NOT_REACHED();
         }
         fillLayer = fillLayer->next();
     }
 }
 
+FontWeight animatableValueToFontWeight(const AnimatableValue* value)
+{
+    int index = round(toAnimatableDouble(value)->toDouble() / 100) - 1;
+
+    static const FontWeight weights[] = {
+        FontWeight100,
+        FontWeight200,
+        FontWeight300,
+        FontWeight400,
+        FontWeight500,
+        FontWeight600,
+        FontWeight700,
+        FontWeight800,
+        FontWeight900
+    };
+
+    index = std::min(std::max(index, 0), static_cast<int>(WTF_ARRAY_LENGTH(weights)) - 1);

[alancutter (OOO until 2018), 2014/02/24 23:01:04]

clampTo<int>()

+
+    return weights[index];
+}
+
 } // namespace
 
 // FIXME: Generate this function.
 void AnimatedStyleBuilder::applyProperty(CSSPropertyID property, StyleResolverState& state, const AnimatableValue* value)
 {
     ASSERT(CSSAnimations::isAnimatableProperty(property));
     if (value->isUnknown()) {
         StyleBuilder::applyProperty(property, state, toAnimatableUnknown(value)->toCSSValue().get());
         return;
     }
@@ skipping 106 matching lines @@
         return;
     case CSSPropertyFloodColor:
         style->setFloodColor(toAnimatableColor(value)->color());
         return;
     case CSSPropertyFloodOpacity:
         style->setFloodOpacity(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0, 1));
         return;
     case CSSPropertyFontSize:
         style->setFontSize(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0));
         return;
+    case CSSPropertyFontWeight:
+        style->setFontWeight(animatableValueToFontWeight(value));
+        return;
     case CSSPropertyHeight:
         style->setHeight(animatableValueToLength(value, state, NonNegativeValues));
         return;
     case CSSPropertyKerning:
         style->setKerning(toAnimatableSVGLength(value)->toSVGLength());
         return;
     case CSSPropertyLeft:
         style->setLeft(animatableValueToLength(value, state));
         return;
     case CSSPropertyLightingColor:
@@ skipping 224 matching lines @@
         return;
     case CSSPropertyZoom:
         style->setZoom(clampTo<float>(toAnimatableDouble(value)->toDouble(), std::numeric_limits<float>::denorm_min()));
         return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace WebCore