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 */ 39 static float GeometryFudgeFactor() { return 0.0656f; } 40 41 float x, y; 42 43 static inline void set(Vertex* vertex, float x, float y) { 44 vertex->x = x; 45 vertex->y = y; 46 } 47 48 static inline void set(Vertex* vertex, Vector2 val) { 49 set(vertex, val.x, val.y); 50 } 51 52 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 67 static inline void set(TextureVertex* vertex, float x, float y, float u, float v) { 68 *vertex = { x, y, u, v }; 69 } 70 71 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 88 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; 104 105 static inline void set(AlphaVertex* vertex, float x, float y, float alpha) { 106 *vertex = { x, y, alpha }; 107 } 108 109 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 } 113 114 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
