1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ANDROID_HWUI_VERTEX_H
18 #define ANDROID_HWUI_VERTEX_H
19 
20 #include "Vector.h"
21 
22 #include "FloatColor.h"
23 #include "utils/Macros.h"
24 
25 namespace android {
26 namespace uirenderer {
27 
28 /**
29  * Simple structure to describe a vertex with a position and a texture.
30  */
31 struct Vertex {
32     /**
33      * Fudge-factor used to disambiguate geometry pixel positioning.
34      *
35      * Used to offset lines and points to avoid ambiguous intersection with pixel centers (see
36      * Program::set()), and used to make geometry damage rect calculation conservative (see
37      * Rect::snapGeometryToPixelBoundaries())
38      */
GeometryFudgeFactorVertex39     static float GeometryFudgeFactor() { return 0.0656f; }
40 
41     float x, y;
42 
setVertex43     static inline void set(Vertex* vertex, float x, float y) {
44         vertex->x = x;
45         vertex->y = y;
46     }
47 
setVertex48     static inline void set(Vertex* vertex, Vector2 val) {
49         set(vertex, val.x, val.y);
50     }
51 
copyWithOffsetVertex52     static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
53         set(vertex, src.x + x, src.y + y);
54     }
55 
56 }; // struct Vertex
57 
58 REQUIRE_COMPATIBLE_LAYOUT(Vertex);
59 
60 /**
61  * Simple structure to describe a vertex with a position and texture UV.
62  */
63 struct TextureVertex {
64     float x, y;
65     float u, v;
66 
setTextureVertex67     static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
68         *vertex = { x, y, u, v };
69     }
70 
setUVTextureVertex71     static inline void setUV(TextureVertex* vertex, float u, float v) {
72         vertex[0].u = u;
73         vertex[0].v = v;
74     }
75 }; // struct TextureVertex
76 
77 REQUIRE_COMPATIBLE_LAYOUT(TextureVertex);
78 
79 /**
80  * Simple structure to describe a vertex with a position, texture UV and an
81  * sRGB color with alpha. The color is stored pre-multiplied in linear space.
82  */
83 struct ColorTextureVertex {
84     float x, y;
85     float u, v;
86     float r, g, b, a; // pre-multiplied linear
87 
setColorTextureVertex88     static inline void set(ColorTextureVertex* vertex, float x, float y,
89             float u, float v, uint32_t color) {
90         FloatColor c;
91         c.set(color);
92         *vertex = { x, y, u, v, c.r, c.g, c.b, c.a };
93     }
94 }; // struct ColorTextureVertex
95 
96 REQUIRE_COMPATIBLE_LAYOUT(ColorTextureVertex);
97 
98 /**
99  * Simple structure to describe a vertex with a position and an alpha value.
100  */
101 struct AlphaVertex {
102     float x, y;
103     float alpha;
104 
setAlphaVertex105     static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
106         *vertex = { x, y, alpha };
107     }
108 
copyWithOffsetAlphaVertex109     static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
110             float x, float y) {
111         AlphaVertex::set(vertex, src.x + x, src.y + y, src.alpha);
112     }
113 
setColorAlphaVertex114     static inline void setColor(AlphaVertex* vertex, float alpha) {
115         vertex[0].alpha = alpha;
116     }
117 }; // struct AlphaVertex
118 
119 REQUIRE_COMPATIBLE_LAYOUT(AlphaVertex);
120 
121 }; // namespace uirenderer
122 }; // namespace android
123 
124 #endif // ANDROID_HWUI_VERTEX_H
125