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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 namespace android {
     23 namespace uirenderer {
     24 
     25 /**
     26  * Simple structure to describe a vertex with a position and a texture.
     27  */
     28 struct 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  */
     59 struct 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  */
     79 struct 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  */
     97 struct 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