1 /* Copyright (C) 1995, 1996 Aladdin Enterprises. All rights reserved. 2 3 This software is provided AS-IS with no warranty, either express or 4 implied. 5 6 This software is distributed under license and may not be copied, 7 modified or distributed except as expressly authorized under the terms 8 of the license contained in the file LICENSE in this distribution. 9 10 For more information about licensing, please refer to 11 http://www.ghostscript.com/licensing/. For information on 12 commercial licensing, go to http://www.artifex.com/licensing/ or 13 contact Artifex Software, Inc., 101 Lucas Valley Road #110, 14 San Rafael, CA 94903, U.S.A., +1(415)492-9861. 15 */ 16 17 /* $Id: gxcvalue.h,v 1.4 2002/02/21 22:24:53 giles Exp $ */ 18 /* Definition of device color values */ 19 20 #ifndef gxcvalue_INCLUDED 21 # define gxcvalue_INCLUDED 22 23 /* Define the type for gray or RGB values at the driver interface. */ 24 typedef unsigned short gx_color_value; 25 26 #define arch_sizeof_gx_color_value arch_sizeof_short 27 /* We might use less than the full range someday. */ 28 /* ...bits must lie between 8 and 16. */ 29 #define gx_color_value_bits (sizeof(gx_color_value) * 8) 30 #define gx_max_color_value ((gx_color_value)((1L << gx_color_value_bits) - 1)) 31 #define gx_color_value_to_byte(cv)\ 32 ((cv) >> (gx_color_value_bits - 8)) 33 #define gx_color_value_from_byte(cb)\ 34 (((cb) << (gx_color_value_bits - 8)) + ((cb) >> (16 - gx_color_value_bits))) 35 36 /* Convert between gx_color_values and fracs. */ 37 #define frac2cv(fr) frac2ushort(fr) 38 #define cv2frac(cv) ushort2frac(cv) 39 40 #endif /* gxcvalue_INCLUDED */ 41