src/mesa/main/colormac.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file colormac.h
  28  * Color-related macros
  29  */
  30
  31
  32 #ifndef COLORMAC_H
  33 #define COLORMAC_H
  34
  35
  36 #include "config.h"
  37 #include "macros.h"
  38 #include "mtypes.h"
  39
  40
  41 /**
  42  * Convert four float values in [0,1] to ubytes in [0,255] with clamping.
  43  */
  44 static inline void
  45 _mesa_unclamped_float_rgba_to_ubyte(GLubyte dst[4], const GLfloat src[4])
  46 {
  47    int i;
  48    for (i = 0; i < 4; i++)
  49       UNCLAMPED_FLOAT_TO_UBYTE(dst[i], src[i]);
  50 }
  51
  52
  53 /**
  54  * \name Generic color packing macros.  All inputs should be GLubytes.
  55  */
  56 /*@{*/
  57
  58 #define PACK_COLOR_8888( X, Y, Z, W ) \
  59    (((X) << 24) | ((Y) << 16) | ((Z) << 8) | (W))
  60
  61 #define PACK_COLOR_565( X, Y, Z )                                  \
  62    ((((X) & 0xf8) << 8) | (((Y) & 0xfc) << 3) | (((Z) & 0xf8) >> 3))
  63
  64 #define PACK_COLOR_1555( A, B, G, R )                                   \
  65    ((((B) & 0xf8) << 7) | (((G) & 0xf8) << 2) | (((R) & 0xf8) >> 3) |   \
  66     (((A) & 0x80) << 8))
  67
  68 #define PACK_COLOR_4444( R, G, B, A )                                   \
  69    ((((R) & 0xf0) << 8) | (((G) & 0xf0) << 4) | ((B) & 0xf0) | ((A) >> 4))
  70
  71 #define PACK_COLOR_88( L, A )                                           \
  72    (((L) << 8) | (A))
  73
  74 /*@}*/
  75
  76
  77 #endif /* COLORMAC_H */