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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkPatchUtils_DEFINED | 8 #ifndef SkPatchUtils_DEFINED |
9 #define SkPatchUtils_DEFINED | 9 #define SkPatchUtils_DEFINED |
10 | 10 |
11 #include "SkColorPriv.h" | 11 #include "SkColorPriv.h" |
12 #include "SkMatrix.h" | 12 #include "SkMatrix.h" |
13 | 13 |
14 class SK_API SkPatchUtils { | 14 class SK_API SkPatchUtils { |
15 | 15 |
16 public: | 16 public: |
17 /** | 17 /** |
18 * Structure that holds the vertex data related to the tessellation of a pat
ch. It is passed | 18 * Structure that holds the vertex data related to the tessellation of a pat
ch. It is passed |
19 * as a parameter to the function getVertexData which sets the points, color
s and texture | 19 * as a parameter to the function getVertexData which sets the points, color
s and texture |
20 * coordinates of the vertices and the indices for them to be drawn as trian
gles. | 20 * coordinates of the vertices and the indices for them to be drawn as trian
gles. |
21 */ | 21 */ |
22 struct VertexData { | 22 struct VertexData { |
23 int fVertexCount, fIndexCount; | 23 int fVertexCount, fIndexCount; |
24 SkPoint* fPoints; | 24 SkPoint* fPoints; |
25 SkPoint* fTexCoords; | 25 SkPoint* fTexCoords; |
26 uint32_t* fColors; | 26 uint32_t* fColors; |
27 uint16_t* fIndices; | 27 uint16_t* fIndices; |
28 | 28 |
29 VertexData() | 29 VertexData() |
30 : fVertexCount(0) | 30 : fVertexCount(0) |
31 , fIndexCount(0) | 31 , fIndexCount(0) |
32 , fPoints(nullptr) | 32 , fPoints(nullptr) |
33 , fTexCoords(nullptr) | 33 , fTexCoords(nullptr) |
34 , fColors(nullptr) | 34 , fColors(nullptr) |
35 , fIndices(nullptr) { } | 35 , fIndices(nullptr) { } |
36 | 36 |
37 ~VertexData() { | 37 ~VertexData() { |
38 delete[] fPoints; | 38 delete[] fPoints; |
39 delete[] fTexCoords; | 39 delete[] fTexCoords; |
40 delete[] fColors; | 40 delete[] fColors; |
41 delete[] fIndices; | 41 delete[] fIndices; |
42 } | 42 } |
43 }; | 43 }; |
44 | 44 |
45 // Enums for control points based on the order specified in the constructor
(clockwise). | 45 // Enums for control points based on the order specified in the constructor
(clockwise). |
46 enum CubicCtrlPts { | 46 enum CubicCtrlPts { |
47 kTopP0_CubicCtrlPts = 0, | 47 kTopP0_CubicCtrlPts = 0, |
48 kTopP1_CubicCtrlPts = 1, | 48 kTopP1_CubicCtrlPts = 1, |
49 kTopP2_CubicCtrlPts = 2, | 49 kTopP2_CubicCtrlPts = 2, |
50 kTopP3_CubicCtrlPts = 3, | 50 kTopP3_CubicCtrlPts = 3, |
51 | 51 |
52 kRightP0_CubicCtrlPts = 3, | 52 kRightP0_CubicCtrlPts = 3, |
53 kRightP1_CubicCtrlPts = 4, | 53 kRightP1_CubicCtrlPts = 4, |
54 kRightP2_CubicCtrlPts = 5, | 54 kRightP2_CubicCtrlPts = 5, |
55 kRightP3_CubicCtrlPts = 6, | 55 kRightP3_CubicCtrlPts = 6, |
56 | 56 |
57 kBottomP0_CubicCtrlPts = 9, | 57 kBottomP0_CubicCtrlPts = 9, |
58 kBottomP1_CubicCtrlPts = 8, | 58 kBottomP1_CubicCtrlPts = 8, |
59 kBottomP2_CubicCtrlPts = 7, | 59 kBottomP2_CubicCtrlPts = 7, |
60 kBottomP3_CubicCtrlPts = 6, | 60 kBottomP3_CubicCtrlPts = 6, |
61 | 61 |
62 kLeftP0_CubicCtrlPts = 0, | 62 kLeftP0_CubicCtrlPts = 0, |
63 kLeftP1_CubicCtrlPts = 11, | 63 kLeftP1_CubicCtrlPts = 11, |
64 kLeftP2_CubicCtrlPts = 10, | 64 kLeftP2_CubicCtrlPts = 10, |
65 kLeftP3_CubicCtrlPts = 9, | 65 kLeftP3_CubicCtrlPts = 9, |
66 }; | 66 }; |
67 | 67 |
68 // Enum for corner also clockwise. | 68 // Enum for corner also clockwise. |
69 enum Corner { | 69 enum Corner { |
70 kTopLeft_Corner = 0, | 70 kTopLeft_Corner = 0, |
71 kTopRight_Corner, | 71 kTopRight_Corner, |
72 kBottomRight_Corner, | 72 kBottomRight_Corner, |
73 kBottomLeft_Corner | 73 kBottomLeft_Corner |
74 }; | 74 }; |
75 | 75 |
76 enum { | 76 enum { |
77 kNumCtrlPts = 12, | 77 kNumCtrlPts = 12, |
78 kNumCorners = 4, | 78 kNumCorners = 4, |
79 kNumPtsCubic = 4 | 79 kNumPtsCubic = 4 |
80 }; | 80 }; |
81 | 81 |
82 /** | 82 /** |
83 * Method that calculates a level of detail (number of subdivisions) for a p
atch in both axis. | 83 * Method that calculates a level of detail (number of subdivisions) for a p
atch in both axis. |
84 */ | 84 */ |
85 static SkISize GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* ma
trix); | 85 static SkISize GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* ma
trix); |
86 | 86 |
87 /** | 87 /** |
88 * Get the points corresponding to the top cubic of cubics. | 88 * Get the points corresponding to the top cubic of cubics. |
89 */ | 89 */ |
90 static void getTopCubic(const SkPoint cubics[12], SkPoint points[4]); | 90 static void getTopCubic(const SkPoint cubics[12], SkPoint points[4]); |
91 | 91 |
92 /** | 92 /** |
93 * Get the points corresponding to the bottom cubic of cubics. | 93 * Get the points corresponding to the bottom cubic of cubics. |
94 */ | 94 */ |
95 static void getBottomCubic(const SkPoint cubics[12], SkPoint points[4]); | 95 static void getBottomCubic(const SkPoint cubics[12], SkPoint points[4]); |
96 | 96 |
97 /** | 97 /** |
98 * Get the points corresponding to the left cubic of cubics. | 98 * Get the points corresponding to the left cubic of cubics. |
99 */ | 99 */ |
100 static void getLeftCubic(const SkPoint cubics[12], SkPoint points[4]); | 100 static void getLeftCubic(const SkPoint cubics[12], SkPoint points[4]); |
101 | 101 |
102 /** | 102 /** |
103 * Get the points corresponding to the right cubic of cubics. | 103 * Get the points corresponding to the right cubic of cubics. |
104 */ | 104 */ |
105 static void getRightCubic(const SkPoint cubics[12], SkPoint points[4]); | 105 static void getRightCubic(const SkPoint cubics[12], SkPoint points[4]); |
106 | 106 |
107 /** | 107 /** |
108 * Function that evaluates the coons patch interpolation. | 108 * Function that evaluates the coons patch interpolation. |
109 * data refers to the pointer of the PatchData struct in which the tessellat
ion data is set. | 109 * data refers to the pointer of the PatchData struct in which the tessellat
ion data is set. |
110 * cubics refers to the points of the cubics. | 110 * cubics refers to the points of the cubics. |
111 * lod refers the level of detail for each axis. | 111 * lod refers the level of detail for each axis. |
112 * colors refers to the corner colors that will be bilerp across the patch (
optional parameter) | 112 * colors refers to the corner colors that will be bilerp across the patch (
optional parameter) |
113 * texCoords refers to the corner texture coordinates that will be bilerp ac
ross the patch | 113 * texCoords refers to the corner texture coordinates that will be bilerp ac
ross the patch |
114 (optional parameter) | 114 (optional parameter) |
115 */ | 115 */ |
116 static bool getVertexData(SkPatchUtils::VertexData* data, const SkPoint cubi
cs[12], | 116 static bool getVertexData(SkPatchUtils::VertexData* data, const SkPoint cubi
cs[12], |
117 const SkColor colors[4], const SkPoint texCoords[4
], | 117 const SkColor colors[4], const SkPoint texCoords[4
], |
118 int lodX, int lodY); | 118 int lodX, int lodY); |
119 }; | 119 }; |
120 | 120 |
121 #endif | 121 #endif |
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