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 namespace android {
     21 namespace uirenderer {
     22 
     23 /**
     24  * Simple structure to describe a vertex with a position and a texture.
     25  */
     26 struct Vertex {
     27     float position[2];
     28 
     29     static inline void set(Vertex* vertex, float x, float y) {
     30         vertex[0].position[0] = x;
     31         vertex[0].position[1] = y;
     32     }
     33 }; // struct Vertex
     34 
     35 /**
     36  * Simple structure to describe a vertex with a position and texture UV.
     37  */
     38 struct TextureVertex {
     39     float position[2];
     40     float texture[2];
     41 
     42     static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
     43         vertex[0].position[0] = x;
     44         vertex[0].position[1] = y;
     45         vertex[0].texture[0] = u;
     46         vertex[0].texture[1] = v;
     47     }
     48 
     49     static inline void setUV(TextureVertex* vertex, float u, float v) {
     50         vertex[0].texture[0] = u;
     51         vertex[0].texture[1] = v;
     52     }
     53 }; // struct TextureVertex
     54 
     55 /**
     56  * Simple structure to describe a vertex with a position, texture UV and ARGB color.
     57  */
     58 struct ColorTextureVertex : TextureVertex {
     59     float color[4];
     60 
     61     static inline void set(ColorTextureVertex* vertex, float x, float y,
     62             float u, float v, int color) {
     63         TextureVertex::set(vertex, x, y, u, v);
     64 
     65         const float a = ((color >> 24) & 0xff) / 255.0f;
     66         vertex[0].color[0] = a * ((color >> 16) & 0xff) / 255.0f;
     67         vertex[0].color[1] = a * ((color >>  8) & 0xff) / 255.0f;
     68         vertex[0].color[2] = a * ((color      ) & 0xff) / 255.0f;
     69         vertex[0].color[3] = a;
     70     }
     71 }; // struct ColorTextureVertex
     72 
     73 /**
     74  * Simple structure to describe a vertex with a position and an alpha value.
     75  */
     76 struct AlphaVertex : Vertex {
     77     float alpha;
     78 
     79     static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
     80         Vertex::set(vertex, x, y);
     81         vertex[0].alpha = alpha;
     82     }
     83 
     84     static inline void setColor(AlphaVertex* vertex, float alpha) {
     85         vertex[0].alpha = alpha;
     86     }
     87 }; // struct AlphaVertex
     88 
     89 }; // namespace uirenderer
     90 }; // namespace android
     91 
     92 #endif // ANDROID_HWUI_VERTEX_H
     93