Layout support for new circle shape syntax

Source/core/rendering/style/BasicShapes.cpp

Index: Source/core/rendering/style/BasicShapes.cpp
diff --git a/Source/core/rendering/style/BasicShapes.cpp b/Source/core/rendering/style/BasicShapes.cpp
index c8ddf8ccca9dc176fbcdc152c237c5e102901d08..51389c39cfb04f1f70229384f0642d23d7f65926 100644
--- a/Source/core/rendering/style/BasicShapes.cpp
+++ b/Source/core/rendering/style/BasicShapes.cpp
@@ -28,8 +28,9 @@
  */
 
 #include "config.h"
-
 #include "core/rendering/style/BasicShapes.h"
+
+#include "core/css/BasicShapeFunctions.h"
 #include "platform/LengthFunctions.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/Path.h"
@@ -47,6 +48,16 @@ bool BasicShape::canBlend(const BasicShape* other) const
         && static_cast<const BasicShapePolygon*>(this)->values().size() != static_cast<const BasicShapePolygon*>(other)->values().size())
         return false;
 
+    // Circles with keywords for radii or center coordinates cannot be animated.
+    if (type() == BasicShape::BasicShapeCircleType) {
+        const BasicShapeCircle* thisCircle = static_cast<const BasicShapeCircle*>(this);
+        const BasicShapeCircle* otherCircle = static_cast<const BasicShapeCircle*>(other);
+        if (!thisCircle->radius().canBlend(otherCircle->radius())
+            || !thisCircle->centerX().canBlend(otherCircle->centerX())
+            || !thisCircle->centerY().canBlend(otherCircle->centerY()))
+            return false;
+    }
+
     return true;
 }
 
@@ -133,21 +144,27 @@ bool BasicShapeCircle::operator==(const BasicShape& o) const
     return m_centerX == other.m_centerX && m_centerY == other.m_centerY && m_radius == other.m_radius;
 }
 
+float BasicShapeCircle::floatValueForRadiusInBox(float boxWidth, float boxHeight) const
+{
+    if (m_radius.type() == BasicShapeRadius::Value)
+        return floatValueForLength(m_radius.value(), sqrtf((boxWidth * boxWidth + boxHeight * boxHeight) / 2));
+
+    float centerX = floatValueForCenterCoordinate(m_centerX, boxWidth);
+    float centerY = floatValueForCenterCoordinate(m_centerY, boxHeight);
+
+    if (m_radius.type() == BasicShapeRadius::ClosestSide)
+        return std::min(std::min(centerX, boxWidth - centerX), std::min(centerY, boxHeight - centerY));
+
+    // If radius.type() == BasicShapeRadius::FarthestSide.
+    return std::max(std::max(centerX, boxWidth - centerX), std::max(centerY, boxHeight - centerY));
+}
+
 void BasicShapeCircle::path(Path& path, const FloatRect& boundingBox)
 {
     ASSERT(path.isEmpty());
-    // FIXME Complete implementation of path.
-    // Compute closest-side and farthest-side from boundingBox.
-    // Compute top, left, bottom, right from boundingBox.
-    if (m_radius.type() != BasicShapeRadius::Value)
-        return;
-    if (m_centerX.keyword() != BasicShapeCenterCoordinate::None || m_centerY.keyword() != BasicShapeCenterCoordinate::None)
-        return;
-
-    float diagonal = sqrtf((boundingBox.width() * boundingBox.width() + boundingBox.height() * boundingBox.height()) / 2);
-    float centerX = floatValueForLength(m_centerX.length(), boundingBox.width());
-    float centerY = floatValueForLength(m_centerY.length(), boundingBox.height());
-    float radius = floatValueForLength(m_radius.value(), diagonal);
+    float centerX = floatValueForCenterCoordinate(m_centerX, boundingBox.width());
+    float centerY = floatValueForCenterCoordinate(m_centerY, boundingBox.height());
+    float radius = floatValueForRadiusInBox(boundingBox.width(), boundingBox.height());
     path.addEllipse(FloatRect(
         centerX - radius + boundingBox.x(),
         centerY - radius + boundingBox.y(),
@@ -162,13 +179,6 @@ PassRefPtr<BasicShape> BasicShapeCircle::blend(const BasicShape* other, double p
     const BasicShapeCircle* o = static_cast<const BasicShapeCircle*>(other);
     RefPtr<BasicShapeCircle> result =  BasicShapeCircle::create();
 
-    if (m_radius.type() != BasicShapeRadius::Value || o->radius().type() != BasicShapeRadius::Value) {
-        result->setCenterX(o->centerX());
-        result->setCenterY(o->centerY());
-        result->setRadius(o->radius());
-        return result;
-    }
-
     result->setCenterX(m_centerX.blend(o->centerX(), progress));
     result->setCenterY(m_centerY.blend(o->centerY(), progress));
     result->setRadius(m_radius.blend(o->radius(), progress));