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      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) { set(vertex, val.x, val.y); }
     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 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 
     65     static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
     66         *vertex = {x, y, u, v};
     67     }
     68 
     69     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 
     86     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 
    103     static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
    104         *vertex = {x, y, alpha};
    105     }
    106 
    107     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 
    112     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