1 /*	$NetBSD: ppmtochrpicon.c,v 1.2 2001/08/20 12:20:06 wiz Exp $	*/
2 
3 /*-
4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Lonhyn T. Jasinskyj.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the NetBSD
21  *	Foundation, Inc. and its contributors.
22  * 4. Neither the name of The NetBSD Foundation nor the names of its
23  *    contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36  * POSSIBILITY OF SUCH DAMAGE.
37  */
38 
39 /*
40  * Usage:
41  *
42  * ppmtochrpicon [ppmfile]
43  *
44  * This programs reads from either a single file given as an argument
45  * or from stdin if no args are given. It tries to find a <ICON...>
46  * tag in the file and read a CHRP style ASCII boot icon. It is not
47  * overly intelligent at dealing with other confusing stuff in the
48  * file or weird formatting due to the specialized nature of the input
49  * files.
50  *
51  * It then produces a PPM file on stdout containing the boot icon's image.
52  */
53 
54 #include <stdlib.h>
55 
56 #include <pbm.h>
57 #include <ppm.h>
58 
59 #include "chrpicon.h"
60 
61 static char *hex_digits = "0123456789ABCDEF";
62 
63 int
64 main(int argc, char *argv[])
65 {
66     FILE *ifp;
67     CHRPI_spec_rec img_rec;
68     CHRPI_spec img = &img_rec;
69     pixval maxval;
70     pixel **pixels;
71 
72     ppm_init(&argc, argv);
73 
74     if (argc > 2)
75 	pm_usage("[ppmfile]");
76 
77     /* either use stdin or open a file */
78     if (argc > 1)
79 	ifp = pm_openr(argv[1]);
80     else
81 	ifp = stdin;
82 
83     /* use the img struct to conveniently store some parameters */
84     pixels = ppm_readppm(ifp, &img->width, &img->height, &maxval);
85 
86     if (maxval != 255)
87         pm_error("can only use 8-bit per channel true-color "
88                  "PPM files (maxval = 255)");
89 
90     if (img->width != 64 || img->height != 64)
91         pm_message("CHRP only supports boot icons of "
92                    "size 64x64, will truncate to fit");
93 
94     img->width = img->height = 64;
95 
96     /* the only supported color space is RGB = 3:3:2 */
97     img->rbits = img->gbits = 3;
98     img->bbits = 2;
99 
100     pm_close(ifp);
101 
102     CHRPI_writeicon(stdout, pixels, img);
103 
104     return 0;
105 }
106 
107 void
108 CHRPI_writeicon(FILE *fp, pixel **pixels, CHRPI_spec img)
109 {
110     CHRPI_putheader(stdout, img);
111     CHRPI_putbitmap(stdout, pixels, img);
112     CHRPI_putfooter(stdout, img);
113 }
114 
115 void
116 CHRPI_putheader(FILE *fp, CHRPI_spec img)
117 {
118     fprintf(fp, "<ICON SIZE=%d,%d COLOR-SPACE=%d,%d,%d>\n<BITMAP>\n",
119             img->height, img->width,
120             img->rbits, img->gbits, img->bbits);
121 }
122 
123 void
124 CHRPI_putfooter(FILE *fp, CHRPI_spec img)
125 {
126     fprintf(fp, "</BITMAP>\n</ICON>\n");
127 }
128 
129 
130 void
131 CHRPI_putbitmap(FILE *fp, pixel** pixels, CHRPI_spec img)
132 {
133     int row, col;
134     pixel *pP;
135 
136     for (row = 0; row < img->height; row++) {
137 
138         pixval r, g, b;
139         char pixbyte;
140 
141         pP = pixels[row];
142 
143         for (col = 0; col < img->width; col++) {
144 
145             r = PPM_GETR(*pP);
146             g = PPM_GETG(*pP);
147             b = PPM_GETB(*pP);
148 
149             pixbyte = (r & 0xe0)  | ((g >> 3) & 0x1c) | ((b >> 6) & 0x03);
150 
151             /* write the byte in hex */
152             fputc(hex_digits[(pixbyte>>4) & 0x0f], fp);
153             fputc(hex_digits[(pixbyte & 0x0f)], fp);
154             pP++;
155         }
156 
157         fputc('\n', fp);
158     }
159 }
160