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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 CCMathUtil_h | 5 #ifndef CCMathUtil_h |
6 #define CCMathUtil_h | 6 #define CCMathUtil_h |
7 | 7 |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "FloatPoint.h" | 9 #include "FloatPoint.h" |
10 #include "FloatPoint3D.h" | 10 #include "FloatPoint3D.h" |
| 11 #include "cc/cc_export.h" |
11 | 12 |
12 namespace WebKit { | 13 namespace WebKit { |
13 class WebTransformationMatrix; | 14 class WebTransformationMatrix; |
14 } | 15 } |
15 | 16 |
16 namespace cc { | 17 namespace cc { |
17 | 18 |
18 class IntRect; | 19 class IntRect; |
19 class FloatRect; | 20 class FloatRect; |
20 class FloatQuad; | 21 class FloatQuad; |
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54 double invW = 1.0 / w; | 55 double invW = 1.0 / w; |
55 return FloatPoint3D(x * invW, y * invW, z * invW); | 56 return FloatPoint3D(x * invW, y * invW, z * invW); |
56 } | 57 } |
57 | 58 |
58 double x; | 59 double x; |
59 double y; | 60 double y; |
60 double z; | 61 double z; |
61 double w; | 62 double w; |
62 }; | 63 }; |
63 | 64 |
64 class MathUtil { | 65 class CC_EXPORT MathUtil { |
65 public: | 66 public: |
66 | 67 |
67 // Background: WebTransformationMatrix code in WebCore does not do the right
thing in | 68 // Background: WebTransformationMatrix code in WebCore does not do the right
thing in |
68 // mapRect / mapQuad / projectQuad when there is a perspective projection th
at causes | 69 // mapRect / mapQuad / projectQuad when there is a perspective projection th
at causes |
69 // one of the transformed vertices to go to w < 0. In those cases, it is nec
essary to | 70 // one of the transformed vertices to go to w < 0. In those cases, it is nec
essary to |
70 // perform clipping in homogeneous coordinates, after applying the transform
, before | 71 // perform clipping in homogeneous coordinates, after applying the transform
, before |
71 // dividing-by-w to convert to cartesian coordinates. | 72 // dividing-by-w to convert to cartesian coordinates. |
72 // | 73 // |
73 // These functions return the axis-aligned rect that encloses the correctly
clipped, | 74 // These functions return the axis-aligned rect that encloses the correctly
clipped, |
74 // transformed polygon. | 75 // transformed polygon. |
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101 // assumed to be normalized. | 102 // assumed to be normalized. |
102 static float smallestAngleBetweenVectors(const FloatSize&, const FloatSize&)
; | 103 static float smallestAngleBetweenVectors(const FloatSize&, const FloatSize&)
; |
103 | 104 |
104 // Projects the |source| vector onto |destination|. Neither vector is assume
d to be normalized. | 105 // Projects the |source| vector onto |destination|. Neither vector is assume
d to be normalized. |
105 static FloatSize projectVector(const FloatSize& source, const FloatSize& des
tination); | 106 static FloatSize projectVector(const FloatSize& source, const FloatSize& des
tination); |
106 }; | 107 }; |
107 | 108 |
108 } // namespace cc | 109 } // namespace cc |
109 | 110 |
110 #endif // #define CCMathUtil_h | 111 #endif // #define CCMathUtil_h |
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