Clean up static_cast<const toBasicFoo*> by using toBasicFoo()

Source/core/rendering/shapes/Shape.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 89 matching lines @@
     ASSERT(basicShape);
 
     bool horizontalWritingMode = isHorizontalWritingMode(writingMode);
     float boxWidth = horizontalWritingMode ? logicalBoxSize.width().toFloat() : logicalBoxSize.height().toFloat();
     float boxHeight = horizontalWritingMode ? logicalBoxSize.height().toFloat() : logicalBoxSize.width().toFloat();
     OwnPtr<Shape> shape;
 
     switch (basicShape->type()) {
 
     case BasicShape::BasicShapeCircleType: {
-        const BasicShapeCircle* circle = static_cast<const BasicShapeCircle*>(basicShape);
+        const BasicShapeCircle* circle = toBasicShapeCircle(basicShape);
         FloatPoint center = floatPointForCenterCoordinate(circle->centerX(), circle->centerY(), FloatSize(boxWidth, boxHeight));
         float radius = circle->floatValueForRadiusInBox(FloatSize(boxWidth, boxHeight));
         FloatPoint logicalCenter = physicalPointToLogical(center, logicalBoxSize.height().toFloat(), writingMode);
 
         shape = createCircleShape(logicalCenter, radius);
         break;
     }
 
     case BasicShape::BasicShapeEllipseType: {
-        const BasicShapeEllipse* ellipse = static_cast<const BasicShapeEllipse*>(basicShape);
+        const BasicShapeEllipse* ellipse = toBasicShapeEllipse(basicShape);
         FloatPoint center = floatPointForCenterCoordinate(ellipse->centerX(), ellipse->centerY(), FloatSize(boxWidth, boxHeight));
         float radiusX = ellipse->floatValueForRadiusInBox(ellipse->radiusX(), center.x(), boxWidth);
         float radiusY = ellipse->floatValueForRadiusInBox(ellipse->radiusY(), center.y(), boxHeight);
         FloatPoint logicalCenter = physicalPointToLogical(center, logicalBoxSize.height().toFloat(), writingMode);
 
         shape = createEllipseShape(logicalCenter, FloatSize(radiusX, radiusY));
         break;
     }
 
     case BasicShape::BasicShapePolygonType: {
-        const BasicShapePolygon* polygon = static_cast<const BasicShapePolygon*>(basicShape);
+        const BasicShapePolygon* polygon = toBasicShapePolygon(basicShape);
         const Vector<Length>& values = polygon->values();
         size_t valuesSize = values.size();
         ASSERT(!(valuesSize % 2));
         OwnPtr<Vector<FloatPoint> > vertices = adoptPtr(new Vector<FloatPoint>(valuesSize / 2));
         for (unsigned i = 0; i < valuesSize; i += 2) {
             FloatPoint vertex(
                 floatValueForLength(values.at(i), boxWidth),
                 floatValueForLength(values.at(i + 1), boxHeight));
             (*vertices)[i / 2] = physicalPointToLogical(vertex, logicalBoxSize.height().toFloat(), writingMode);
         }
         shape = createPolygonShape(vertices.release(), polygon->windRule());
         break;
     }
 
     case BasicShape::BasicShapeInsetType: {
-        const BasicShapeInset& inset = *static_cast<const BasicShapeInset*>(basicShape);
+        const BasicShapeInset& inset = *toBasicShapeInset(basicShape);
         float left = floatValueForLength(inset.left(), boxWidth);
         float top = floatValueForLength(inset.top(), boxHeight);
         float right = floatValueForLength(inset.right(), boxWidth);
         float bottom = floatValueForLength(inset.bottom(), boxHeight);
         FloatRect rect(left, top, std::max<float>(boxWidth - left - right, 0), std::max<float>(boxHeight - top - bottom, 0));
         FloatRect logicalRect = physicalRectToLogical(rect, logicalBoxSize.height().toFloat(), writingMode);
 
         FloatSize boxSize(boxWidth, boxHeight);
         FloatSize topLeftRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.topLeftRadius(), boxSize), writingMode);
         FloatSize topRightRadius = physicalSizeToLogical(floatSizeForLengthSize(inset.topRightRadius(), boxSize), writingMode);
@@ skipping 64 matching lines @@
     FloatRect rect(0, 0, roundedRect.rect().width(), roundedRect.rect().height());
     FloatRoundedRect bounds(rect, roundedRect.radii());
     OwnPtr<Shape> shape = createInsetShape(bounds);
     shape->m_writingMode = writingMode;
     shape->m_margin = margin;
 
     return shape.release();
 }
 
 } // namespace WebCore