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
22namespace android {
23namespace uirenderer {
24
25/**
26 * Simple structure to describe a vertex with a position and a texture.
27 */
28struct Vertex {
29    /**
30     * Fudge-factor used to disambiguate geometry pixel positioning.
31     *
32     * Used to offset lines and points to avoid ambiguous intersection with pixel centers (see
33     * Program::set()), and used to make geometry damage rect calculation conservative (see
34     * Rect::snapGeometryToPixelBoundaries())
35     */
36    static float GeometryFudgeFactor() { return 0.0656f; }
37
38
39    float x, y;
40
41    static inline void set(Vertex* vertex, float x, float y) {
42        vertex[0].x = x;
43        vertex[0].y = y;
44    }
45
46    static inline void set(Vertex* vertex, Vector2 val) {
47        set(vertex, val.x, val.y);
48    }
49
50    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/**
57 * Simple structure to describe a vertex with a position and texture UV.
58 */
59struct TextureVertex {
60    float x, y;
61    float u, v;
62
63    static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
64        vertex[0].x = x;
65        vertex[0].y = y;
66        vertex[0].u = u;
67        vertex[0].v = v;
68    }
69
70    static inline void setUV(TextureVertex* vertex, float u, float v) {
71        vertex[0].u = u;
72        vertex[0].v = v;
73    }
74}; // struct TextureVertex
75
76/**
77 * Simple structure to describe a vertex with a position, texture UV and ARGB color.
78 */
79struct ColorTextureVertex : TextureVertex {
80    float r, g, b, a;
81
82    static inline void set(ColorTextureVertex* vertex, float x, float y,
83            float u, float v, int color) {
84        TextureVertex::set(vertex, x, y, u, v);
85
86        const float a = ((color >> 24) & 0xff) / 255.0f;
87        vertex[0].r = a * ((color >> 16) & 0xff) / 255.0f;
88        vertex[0].g = a * ((color >>  8) & 0xff) / 255.0f;
89        vertex[0].b = a * ((color      ) & 0xff) / 255.0f;
90        vertex[0].a = a;
91    }
92}; // struct ColorTextureVertex
93
94/**
95 * Simple structure to describe a vertex with a position and an alpha value.
96 */
97struct AlphaVertex : Vertex {
98    float alpha;
99
100    static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
101        Vertex::set(vertex, x, y);
102        vertex[0].alpha = alpha;
103    }
104
105    static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
106            float x, float y) {
107        Vertex::set(vertex, src.x + x, src.y + y);
108        vertex[0].alpha = src.alpha;
109    }
110
111    static inline void setColor(AlphaVertex* vertex, float alpha) {
112        vertex[0].alpha = alpha;
113    }
114}; // struct AlphaVertex
115
116}; // namespace uirenderer
117}; // namespace android
118
119#endif // ANDROID_HWUI_VERTEX_H
120