Consolidate some text shadow code.

Source/core/rendering/style/ShadowList.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 14 matching lines @@
  * 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.
  */
 
 #include "config.h"
 #include "core/rendering/style/ShadowList.h"
 
 #include "platform/geometry/FloatRect.h"
+#include "wtf/OwnPtr.h"
 
 namespace WebCore {
 
 static inline void calculateShadowExtent(const ShadowList* shadowList, float additionalOutlineSize, float& shadowLeft, float& shadowRight, float& shadowTop, float& shadowBottom)
 {
     ASSERT(shadowList);
     size_t shadowCount = shadowList->shadows().size();
     for (size_t i = 0; i < shadowCount; ++i) {
         const ShadowData& shadow = shadowList->shadows()[i];
         if (shadow.style() == Inset)
@@ skipping 45 matching lines @@
         if (!fromShadow)
             fromShadow = toShadow->style() == Inset ? &defaultInsetShadowData : &defaultShadowData;
         else if (!toShadow)
             toShadow = fromShadow->style() == Inset ? &defaultInsetShadowData : &defaultShadowData;
         shadows.append(toShadow->blend(*fromShadow, progress));
     }
 
     return ShadowList::adopt(shadows);
 }
 
+PassOwnPtr<DrawLooperBuilder> ShadowList::createDrawLooper(DrawLooperBuilder::ShadowAlphaMode alphaMode, bool isHorizontal) const
+{
+    OwnPtr<DrawLooperBuilder> drawLooperBuilder = DrawLooperBuilder::create();
+    for (size_t i = shadows().size(); i--; ) {
+        const ShadowData& shadow = shadows()[i];
+        float shadowX = isHorizontal ? shadow.x() : shadow.y();
+        float shadowY = isHorizontal ? shadow.y() : -shadow.x();
+        drawLooperBuilder->addShadow(FloatSize(shadowX, shadowY), shadow.blur(), shadow.color(),
+            DrawLooperBuilder::ShadowRespectsTransforms, alphaMode);
+    }
+    drawLooperBuilder->addUnmodifiedContent();
+    return drawLooperBuilder.release();
+}
+
 } // namespace WebCore