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c1aa0403 WJ |
1 | /* Copyright (C) 1992 Aladdin Enterprises. All rights reserved. |
2 | Distributed by Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of Ghostscript. | |
5 | ||
6 | Ghostscript is distributed in the hope that it will be useful, but | |
7 | WITHOUT ANY WARRANTY. No author or distributor accepts responsibility | |
8 | to anyone for the consequences of using it or for whether it serves any | |
9 | particular purpose or works at all, unless he says so in writing. Refer | |
10 | to the Ghostscript General Public License for full details. | |
11 | ||
12 | Everyone is granted permission to copy, modify and redistribute | |
13 | Ghostscript, but only under the conditions described in the Ghostscript | |
14 | General Public License. A copy of this license is supposed to have been | |
15 | given to you along with Ghostscript so you can know your rights and | |
16 | responsibilities. It should be in a file named COPYING. Among other | |
17 | things, the copyright notice and this notice must be preserved on all | |
18 | copies. */ | |
19 | ||
20 | /* gdevpccm.c */ | |
21 | /* Support routines for PC color mapping */ | |
22 | #include "gs.h" | |
23 | #include "gsmatrix.h" /* for gxdevice.h */ | |
24 | #include "gxdevice.h" | |
25 | #include "gdevpccm.h" /* interface */ | |
26 | ||
27 | /* Color mapping routines for EGA/VGA-style color. */ | |
28 | /* Colors are 4 bits: 8=intensity, 4=R, 2=G, 1=B. */ | |
29 | ||
30 | #define black 0 | |
31 | #define blue 1 | |
32 | #define green 2 | |
33 | #define cyan 3 | |
34 | #define red 4 | |
35 | #define magenta 5 | |
36 | #define brown 6 | |
37 | #define white 7 | |
38 | #define dgray 8 /* dark gray is not very usable */ | |
39 | #define lblue 9 | |
40 | #define lgreen 10 | |
41 | #define lcyan 11 | |
42 | #define lred 12 | |
43 | #define lmagenta 13 | |
44 | #define yellow 14 | |
45 | #define bwhite 15 | |
46 | gx_color_index | |
47 | pc_4bit_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g, | |
48 | gx_color_value b) | |
49 | { | |
50 | #define c13 (gx_max_color_value / 3) | |
51 | #define c23 (gx_max_color_value - c13) | |
52 | static byte g0[3][3] = | |
53 | {{black,blue,lblue},{red,magenta,lmagenta},{lred,lmagenta,lmagenta}}; | |
54 | static byte g1[3][3] = | |
55 | {{green,cyan,lcyan},{brown,white,lcyan},{yellow,yellow,lmagenta}}; | |
56 | static byte g2[3][3] = | |
57 | {{lgreen,lgreen,lcyan},{lgreen,lgreen,lcyan},{yellow,yellow,bwhite}}; | |
58 | return (gx_color_index) | |
59 | ((g >= c23 ? g2 : g >= c13 ? g1 : g0) | |
60 | [r >= c23 ? 2 : r >= c13 ? 1 : 0] | |
61 | [b >= c23 ? 2 : b >= c13 ? 1 : 0]); | |
62 | #undef c13 | |
63 | #undef c23 | |
64 | } | |
65 | int | |
66 | pc_4bit_map_color_rgb(gx_device *dev, gx_color_index color, | |
67 | gx_color_value prgb[3]) | |
68 | { | |
69 | #define icolor (int)color | |
70 | gx_color_value one = | |
71 | (icolor & 8 ? gx_max_color_value : gx_max_color_value / 3); | |
72 | prgb[0] = (icolor & 4 ? one : 0); | |
73 | prgb[1] = (icolor & 2 ? one : 0); | |
74 | prgb[2] = (icolor & 1 ? one : 0); | |
75 | return 0; | |
76 | #undef icolor | |
77 | } | |
78 | ||
79 | /* Color mapping routines for 8-bit color with a fixed palette */ | |
80 | /* (3 bits of R, 3 bits of G, 2 bits of B). */ | |
81 | ||
82 | gx_color_index | |
83 | pc_8bit_map_rgb_color(gx_device *dev, gx_color_value r, gx_color_value g, | |
84 | gx_color_value b) | |
85 | { return (gx_color_index) | |
86 | (((r >> (gx_color_value_bits - 3)) << 5) + | |
87 | ((g >> (gx_color_value_bits - 3)) << 2) + | |
88 | ((b >> (gx_color_value_bits - 2)))); | |
89 | } | |
90 | int | |
91 | pc_8bit_map_color_rgb(gx_device *dev, gx_color_index color, | |
92 | gx_color_value prgb[3]) | |
93 | { | |
94 | #define icolor (uint)color | |
95 | prgb[0] = ((icolor >> 5) & 7) * (gx_max_color_value / 7); | |
96 | prgb[1] = ((icolor >> 2) & 7) * (gx_max_color_value / 7); | |
97 | prgb[2] = (icolor & 3) * (gx_max_color_value / 3); | |
98 | #undef icolor | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* Write a palette on a file. */ | |
103 | int | |
104 | pc_write_palette(gx_device *dev, uint max_index, FILE *file) | |
105 | { uint i, c; | |
106 | gx_color_value rgb[3]; | |
107 | for ( i = 0; i < max_index; i++ ) | |
108 | { (*dev->procs->map_color_rgb)(dev, (gx_color_index)i, rgb); | |
109 | for ( c = 0; c < 3; c++ ) | |
110 | { byte b = rgb[c] >> (gx_color_value_bits - 8); | |
111 | fputc(b, file); | |
112 | } | |
113 | } | |
114 | return 0; | |
115 | } |