[cc] Rename all cc/ filenames to Chromium style

cc/CCMathUtil.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CCMathUtil_h
-#define CCMathUtil_h
-
-#include "FloatPoint.h"
-#include "FloatPoint3D.h"
-
-namespace WebKit {
-class WebTransformationMatrix;
-}
-
-namespace cc {
-
-class IntRect;
-class FloatRect;
-class FloatQuad;
-
-struct HomogeneousCoordinate {
-    HomogeneousCoordinate(double newX, double newY, double newZ, double newW)
-        : x(newX)
-        , y(newY)
-        , z(newZ)
-        , w(newW)
-    {
-    }
-
-    bool shouldBeClipped() const
-    {
-        return w <= 0;
-    }
-
-    FloatPoint cartesianPoint2d() const
-    {
-        if (w == 1)
-            return FloatPoint(x, y);
-
-        // For now, because this code is used privately only by CCMathUtil, it should never be called when w == 0, and we do not yet need to handle that case.
-        ASSERT(w);
-        double invW = 1.0 / w;
-        return FloatPoint(x * invW, y * invW);
-    }
-
-    FloatPoint3D cartesianPoint3d() const
-    {
-        if (w == 1)
-            return FloatPoint3D(x, y, z);
-
-        // For now, because this code is used privately only by CCMathUtil, it should never be called when w == 0, and we do not yet need to handle that case.
-        ASSERT(w);
-        double invW = 1.0 / w;
-        return FloatPoint3D(x * invW, y * invW, z * invW);
-    }
-
-    double x;
-    double y;
-    double z;
-    double w;
-};
-
-class CCMathUtil {
-public:
-
-    // Background: WebTransformationMatrix code in WebCore does not do the right thing in
-    // mapRect / mapQuad / projectQuad when there is a perspective projection that causes
-    // one of the transformed vertices to go to w < 0. In those cases, it is necessary to
-    // perform clipping in homogeneous coordinates, after applying the transform, before
-    // dividing-by-w to convert to cartesian coordinates.
-    //
-    // These functions return the axis-aligned rect that encloses the correctly clipped,
-    // transformed polygon.
-    static IntRect mapClippedRect(const WebKit::WebTransformationMatrix&, const IntRect&);
-    static FloatRect mapClippedRect(const WebKit::WebTransformationMatrix&, const FloatRect&);
-    static FloatRect projectClippedRect(const WebKit::WebTransformationMatrix&, const FloatRect&);
-
-    // Returns an array of vertices that represent the clipped polygon. After returning, indexes from
-    // 0 to numVerticesInClippedQuad are valid in the clippedQuad array. Note that
-    // numVerticesInClippedQuad may be zero, which means the entire quad was clipped, and
-    // none of the vertices in the array are valid.
-    static void mapClippedQuad(const WebKit::WebTransformationMatrix&, const FloatQuad& srcQuad, FloatPoint clippedQuad[8], int& numVerticesInClippedQuad);
-
-    static FloatRect computeEnclosingRectOfVertices(FloatPoint vertices[], int numVertices);
-    static FloatRect computeEnclosingClippedRect(const HomogeneousCoordinate& h1, const HomogeneousCoordinate& h2, const HomogeneousCoordinate& h3, const HomogeneousCoordinate& h4);
-
-    // NOTE: These functions do not do correct clipping against w = 0 plane, but they
-    // correctly detect the clipped condition via the boolean clipped.
-    static FloatQuad mapQuad(const WebKit::WebTransformationMatrix&, const FloatQuad&, bool& clipped);
-    static FloatPoint mapPoint(const WebKit::WebTransformationMatrix&, const FloatPoint&, bool& clipped);
-    static FloatPoint3D mapPoint(const WebKit::WebTransformationMatrix&, const FloatPoint3D&, bool& clipped);
-    static FloatQuad projectQuad(const WebKit::WebTransformationMatrix&, const FloatQuad&, bool& clipped);
-    static FloatPoint projectPoint(const WebKit::WebTransformationMatrix&, const FloatPoint&, bool& clipped);
-
-    static void flattenTransformTo2d(WebKit::WebTransformationMatrix&);
-
-    // Returns the smallest angle between the given two vectors in degrees. Neither vector is
-    // assumed to be normalized.
-    static float smallestAngleBetweenVectors(const FloatSize&, const FloatSize&);
-
-    // Projects the |source| vector onto |destination|. Neither vector is assumed to be normalized.
-    static FloatSize projectVector(const FloatSize& source, const FloatSize& destination);
-};
-
-} // namespace cc
-
-#endif // #define CCMathUtil_h
+// Temporary forwarding header
+#include "cc/math_util.h"