Home | History | Annotate | Download | only in hwui 
      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 const float gGeometryFudgeFactor = 0.0656f;
     37 
     38     float position[2];
     39 
     40     static inline void set(Vertex* vertex, float x, float y) {
     41         vertex[0].position[0] = x;
     42         vertex[0].position[1] = y;
     43     }
     44 
     45     static inline void set(Vertex* vertex, vec2 val) {
     46         set(vertex, val.x, val.y);
     47     }
     48 
     49     static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
     50         set(vertex, src.position[0] + x, src.position[1] + y);
     51     }
     52 
     53 }; // struct Vertex
     54 
     55 /**
     56  * Simple structure to describe a vertex with a position and texture UV.
     57  */
     58 struct TextureVertex {
     59     float position[2];
     60     float texture[2];
     61 
     62     static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
     63         vertex[0].position[0] = x;
     64         vertex[0].position[1] = y;
     65         vertex[0].texture[0] = u;
     66         vertex[0].texture[1] = v;
     67     }
     68 
     69     static inline void setUV(TextureVertex* vertex, float u, float v) {
     70         vertex[0].texture[0] = u;
     71         vertex[0].texture[1] = v;
     72     }
     73 }; // struct TextureVertex
     74 
     75 /**
     76  * Simple structure to describe a vertex with a position, texture UV and ARGB color.
     77  */
     78 struct ColorTextureVertex : TextureVertex {
     79     float color[4];
     80 
     81     static inline void set(ColorTextureVertex* vertex, float x, float y,
     82             float u, float v, int color) {
     83         TextureVertex::set(vertex, x, y, u, v);
     84 
     85         const float a = ((color >> 24) & 0xff) / 255.0f;
     86         vertex[0].color[0] = a * ((color >> 16) & 0xff) / 255.0f;
     87         vertex[0].color[1] = a * ((color >>  8) & 0xff) / 255.0f;
     88         vertex[0].color[2] = a * ((color      ) & 0xff) / 255.0f;
     89         vertex[0].color[3] = a;
     90     }
     91 }; // struct ColorTextureVertex
     92 
     93 /**
     94  * Simple structure to describe a vertex with a position and an alpha value.
     95  */
     96 struct AlphaVertex : Vertex {
     97     float alpha;
     98 
     99     static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
    100         Vertex::set(vertex, x, y);
    101         vertex[0].alpha = alpha;
    102     }
    103 
    104     static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
    105             float x, float y) {
    106         Vertex::set(vertex, src.position[0] + x, src.position[1] + y);
    107         vertex[0].alpha = src.alpha;
    108     }
    109 
    110     static inline void setColor(AlphaVertex* vertex, float alpha) {
    111         vertex[0].alpha = alpha;
    112     }
    113 }; // struct AlphaVertex
    114 
    115 }; // namespace uirenderer
    116 }; // namespace android
    117 
    118 #endif // ANDROID_HWUI_VERTEX_H
    119