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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_BASE_MATH_UTIL_H_ | 5 #ifndef CC_BASE_MATH_UTIL_H_ |
6 #define CC_BASE_MATH_UTIL_H_ | 6 #define CC_BASE_MATH_UTIL_H_ |
7 | 7 |
8 #include <cmath> | 8 #include <cmath> |
9 | 9 |
10 #include "base/logging.h" | 10 #include "base/logging.h" |
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73 static float Rad2Deg(float rad) { return rad * 180.0f / kPiFloat; } | 73 static float Rad2Deg(float rad) { return rad * 180.0f / kPiFloat; } |
74 | 74 |
75 static float Round(float f) { | 75 static float Round(float f) { |
76 return (f > 0.f) ? std::floor(f + 0.5f) : std::ceil(f - 0.5f); | 76 return (f > 0.f) ? std::floor(f + 0.5f) : std::ceil(f - 0.5f); |
77 } | 77 } |
78 static double Round(double d) { | 78 static double Round(double d) { |
79 return (d > 0.0) ? std::floor(d + 0.5) : std::ceil(d - 0.5); | 79 return (d > 0.0) ? std::floor(d + 0.5) : std::ceil(d - 0.5); |
80 } | 80 } |
81 | 81 |
82 // Background: Existing transform code does not do the right thing in | 82 // Background: Existing transform code does not do the right thing in |
83 // mapRect / mapQuad / projectQuad when there is a perspective projection that | 83 // MapRect / MapQuad / ProjectQuad when there is a perspective projection that |
84 // causes one of the transformed vertices to go to w < 0. In those cases, it | 84 // causes one of the transformed vertices to go to w < 0. In those cases, it |
85 // is necessary to perform clipping in homogeneous coordinates, after applying | 85 // is necessary to perform clipping in homogeneous coordinates, after applying |
86 // the transform, before dividing-by-w to convert to cartesian coordinates. | 86 // the transform, before dividing-by-w to convert to cartesian coordinates. |
87 // | 87 // |
88 // These functions return the axis-aligned rect that encloses the correctly | 88 // These functions return the axis-aligned rect that encloses the correctly |
89 // clipped, transformed polygon. | 89 // clipped, transformed polygon. |
90 static gfx::Rect MapClippedRect(const gfx::Transform& transform, | 90 static gfx::Rect MapClippedRect(const gfx::Transform& transform, |
91 gfx::Rect rect); | 91 gfx::Rect rect); |
92 static gfx::RectF MapClippedRect(const gfx::Transform& transform, | 92 static gfx::RectF MapClippedRect(const gfx::Transform& transform, |
93 const gfx::RectF& rect); | 93 const gfx::RectF& rect); |
94 static gfx::RectF ProjectClippedRect(const gfx::Transform& transform, | 94 static gfx::RectF ProjectClippedRect(const gfx::Transform& transform, |
95 const gfx::RectF& rect); | 95 const gfx::RectF& rect); |
96 | 96 |
97 // Returns an array of vertices that represent the clipped polygon. After | 97 // Returns an array of vertices that represent the clipped polygon. After |
98 // returning, indexes from 0 to numVerticesInClippedQuad are valid in the | 98 // returning, indexes from 0 to num_vertices_in_clipped_quad are valid in the |
99 // clippedQuad array. Note that numVerticesInClippedQuad may be zero, which | 99 // clipped_quad array. Note that num_vertices_in_clipped_quad may be zero, |
100 // means the entire quad was clipped, and none of the vertices in the array | 100 // which means the entire quad was clipped, and none of the vertices in the |
101 // are valid. | 101 // array are valid. |
102 static void MapClippedQuad(const gfx::Transform& transform, | 102 static void MapClippedQuad(const gfx::Transform& transform, |
103 const gfx::QuadF& src_quad, | 103 const gfx::QuadF& src_quad, |
104 gfx::PointF clippedQuad[8], | 104 gfx::PointF clipped_quad[8], |
105 int& numVerticesInClippedQuad); | 105 int& num_vertices_in_clipped_quad); |
106 | 106 |
107 static gfx::RectF ComputeEnclosingRectOfVertices(gfx::PointF vertices[], | 107 static gfx::RectF ComputeEnclosingRectOfVertices(gfx::PointF vertices[], |
108 int num_vertices); | 108 int num_vertices); |
109 static gfx::RectF ComputeEnclosingClippedRect( | 109 static gfx::RectF ComputeEnclosingClippedRect( |
110 const HomogeneousCoordinate& h1, | 110 const HomogeneousCoordinate& h1, |
111 const HomogeneousCoordinate& h2, | 111 const HomogeneousCoordinate& h2, |
112 const HomogeneousCoordinate& h3, | 112 const HomogeneousCoordinate& h3, |
113 const HomogeneousCoordinate& h4); | 113 const HomogeneousCoordinate& h4); |
114 | 114 |
115 // NOTE: These functions do not do correct clipping against w = 0 plane, but | 115 // NOTE: These functions do not do correct clipping against w = 0 plane, but |
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151 // Returns a base::Value representation of the floating point value. | 151 // Returns a base::Value representation of the floating point value. |
152 // If the value is inf, returns max double/float representation. | 152 // If the value is inf, returns max double/float representation. |
153 static scoped_ptr<base::Value> AsValueSafely(double value); | 153 static scoped_ptr<base::Value> AsValueSafely(double value); |
154 static scoped_ptr<base::Value> AsValueSafely(float value); | 154 static scoped_ptr<base::Value> AsValueSafely(float value); |
155 | 155 |
156 }; | 156 }; |
157 | 157 |
158 } // namespace cc | 158 } // namespace cc |
159 | 159 |
160 #endif // CC_BASE_MATH_UTIL_H_ | 160 #endif // CC_BASE_MATH_UTIL_H_ |
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