[#4] Pass gfx structs by const ref (gfx::PointF)

cc/base/math_util.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 CC_BASE_MATH_UTIL_H_
 #define CC_BASE_MATH_UTIL_H_
 
 #include <algorithm>
 #include <cmath>
 
@@ skipping 98 matching lines @@
   // Returns an array of vertices that represent the clipped polygon. After
   // returning, indexes from 0 to num_vertices_in_clipped_quad are valid in the
   // clipped_quad array. Note that num_vertices_in_clipped_quad may be zero,
   // which means the entire quad was clipped, and none of the vertices in the
   // array are valid.
   static void MapClippedQuad(const gfx::Transform& transform,
                              const gfx::QuadF& src_quad,
                              gfx::PointF clipped_quad[8],
                              int* num_vertices_in_clipped_quad);
 
-  static gfx::RectF ComputeEnclosingRectOfVertices(gfx::PointF vertices[],
+  static gfx::RectF ComputeEnclosingRectOfVertices(const gfx::PointF vertices[],
                                                    int num_vertices);
   static gfx::RectF 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 gfx::QuadF MapQuad(const gfx::Transform& transform,
                             const gfx::QuadF& quad,
                             bool* clipped);
   static gfx::PointF MapPoint(const gfx::Transform& transform,
-                              gfx::PointF point,
+                              const gfx::PointF& point,
                               bool* clipped);
   static gfx::Point3F MapPoint(const gfx::Transform&,
                                const gfx::Point3F&,
                                bool* clipped);
   static gfx::QuadF ProjectQuad(const gfx::Transform& transform,
                                 const gfx::QuadF& quad,
                                 bool* clipped);
   static gfx::PointF ProjectPoint(const gfx::Transform& transform,
-                                  gfx::PointF point,
+                                  const gfx::PointF& point,
                                   bool* clipped);
 
   static gfx::Vector2dF ComputeTransform2dScaleComponents(const gfx::Transform&,
                                                           float fallbackValue);
 
   // Makes a rect that has the same relationship to input_outer_rect as
   // scale_inner_rect has to scale_outer_rect. scale_inner_rect should be
   // contained within scale_outer_rect, and likewise the rectangle that is
   // returned will be within input_outer_rect at a similar relative, scaled
   // position.
   static gfx::RectF ScaleRectProportional(const gfx::RectF& input_outer_rect,
                                           const gfx::RectF& scale_outer_rect,
                                           const gfx::RectF& scale_inner_rect);
 
   // Returns the smallest angle between the given two vectors in degrees.
   // Neither vector is assumed to be normalized.
   static float SmallestAngleBetweenVectors(gfx::Vector2dF v1,
                                            gfx::Vector2dF v2);
 
   // Projects the |source| vector onto |destination|. Neither vector is assumed
   // to be normalized.
   static gfx::Vector2dF ProjectVector(gfx::Vector2dF source,
                                       gfx::Vector2dF destination);
 
   // Conversion to value.
   static scoped_ptr<base::Value> AsValue(gfx::Size s);
   static scoped_ptr<base::Value> AsValue(gfx::SizeF s);
   static scoped_ptr<base::Value> AsValue(const gfx::Rect& r);
   static bool FromValue(const base::Value*, gfx::Rect* out_rect);
-  static scoped_ptr<base::Value> AsValue(gfx::PointF q);
+  static scoped_ptr<base::Value> AsValue(const gfx::PointF& q);
   static scoped_ptr<base::Value> AsValue(const gfx::QuadF& q);
   static scoped_ptr<base::Value> AsValue(const gfx::RectF& rect);
   static scoped_ptr<base::Value> AsValue(const gfx::Transform& transform);
   static scoped_ptr<base::Value> AsValue(const gfx::BoxF& box);
 
   // Returns a base::Value representation of the floating point value.
   // If the value is inf, returns max double/float representation.
   static scoped_ptr<base::Value> AsValueSafely(double value);
   static scoped_ptr<base::Value> AsValueSafely(float value);
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_MATH_UTIL_H_