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) { set(vertex, val.x, val.y); }
49 
copyWithOffsetVertex50     static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
51         set(vertex, src.x + x, src.y + y);
52     }
53 
54 };  // struct Vertex
55 
56 REQUIRE_COMPATIBLE_LAYOUT(Vertex);
57 
58 /**
59  * Simple structure to describe a vertex with a position and texture UV.
60  */
61 struct TextureVertex {
62     float x, y;
63     float u, v;
64 
setTextureVertex65     static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
66         *vertex = {x, y, u, v};
67     }
68 
setUVTextureVertex69     static inline void setUV(TextureVertex* vertex, float u, float v) {
70         vertex[0].u = u;
71         vertex[0].v = v;
72     }
73 };  // struct TextureVertex
74 
75 REQUIRE_COMPATIBLE_LAYOUT(TextureVertex);
76 
77 /**
78  * Simple structure to describe a vertex with a position, texture UV and an
79  * sRGB color with alpha. The color is stored pre-multiplied in linear space.
80  */
81 struct ColorTextureVertex {
82     float x, y;
83     float u, v;
84     float r, g, b, a;  // pre-multiplied linear
85 
setColorTextureVertex86     static inline void set(ColorTextureVertex* vertex, float x, float y, float u, float v,
87                            uint32_t color) {
88         FloatColor c;
89         c.set(color);
90         *vertex = {x, y, u, v, c.r, c.g, c.b, c.a};
91     }
92 };  // struct ColorTextureVertex
93 
94 REQUIRE_COMPATIBLE_LAYOUT(ColorTextureVertex);
95 
96 /**
97  * Simple structure to describe a vertex with a position and an alpha value.
98  */
99 struct AlphaVertex {
100     float x, y;
101     float alpha;
102 
setAlphaVertex103     static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
104         *vertex = {x, y, alpha};
105     }
106 
copyWithOffsetAlphaVertex107     static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src, float x,
108                                       float y) {
109         AlphaVertex::set(vertex, src.x + x, src.y + y, src.alpha);
110     }
111 
setColorAlphaVertex112     static inline void setColor(AlphaVertex* vertex, float alpha) { vertex[0].alpha = alpha; }
113 };  // struct AlphaVertex
114 
115 REQUIRE_COMPATIBLE_LAYOUT(AlphaVertex);
116 
117 };  // namespace uirenderer
118 };  // namespace android
119 
120 #endif  // ANDROID_HWUI_VERTEX_H
121