1 /*	$NetBSD: ppmtochrpicon.c,v 1.6 2008/04/28 20:23:33 martin 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  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 /*
33  * Usage:
34  *
35  * ppmtochrpicon [ppmfile]
36  *
37  * This programs reads from either a single file given as an argument
38  * or from stdin if no args are given. It tries to find a <ICON...>
39  * tag in the file and read a CHRP style ASCII boot icon. It is not
40  * overly intelligent at dealing with other confusing stuff in the
41  * file or weird formatting due to the specialized nature of the input
42  * files.
43  *
44  * It then produces a PPM file on stdout containing the boot icon's image.
45  */
46 
47 #include <sys/cdefs.h>
48 __RCSID("$NetBSD: ppmtochrpicon.c,v 1.6 2008/04/28 20:23:33 martin Exp $");
49 
50 #include <stdlib.h>
51 
52 #include <pbm.h>
53 #include <ppm.h>
54 
55 #include "chrpicon.h"
56 
57 static char *hex_digits = "0123456789ABCDEF";
58 
59 int
60 main(int argc, char *argv[])
61 {
62     FILE *ifp;
63     CHRPI_spec_rec img_rec;
64     CHRPI_spec img = &img_rec;
65     pixval maxval;
66     pixel **pixels;
67 
68     ppm_init(&argc, argv);
69 
70     if (argc > 2)
71 	pm_usage("[ppmfile]");
72 
73     /* either use stdin or open a file */
74     if (argc > 1)
75 	ifp = pm_openr(argv[1]);
76     else
77 	ifp = stdin;
78 
79     /* use the img struct to conveniently store some parameters */
80     pixels = ppm_readppm(ifp, &img->width, &img->height, &maxval);
81 
82     if (maxval != 255)
83         pm_error("can only use 8-bit per channel true-color "
84                  "PPM files (maxval = 255)");
85 
86     if (img->width != 64 || img->height != 64)
87         pm_message("CHRP only supports boot icons of "
88                    "size 64x64, will truncate to fit");
89 
90     img->width = img->height = 64;
91 
92     /* the only supported color space is RGB = 3:3:2 */
93     img->rbits = img->gbits = 3;
94     img->bbits = 2;
95 
96     pm_close(ifp);
97 
98     CHRPI_writeicon(stdout, pixels, img);
99 
100     return 0;
101 }
102 
103 void
104 CHRPI_writeicon(FILE *fp, pixel **pixels, CHRPI_spec img)
105 {
106     CHRPI_putheader(stdout, img);
107     CHRPI_putbitmap(stdout, pixels, img);
108     CHRPI_putfooter(stdout, img);
109 }
110 
111 void
112 CHRPI_putheader(FILE *fp, CHRPI_spec img)
113 {
114     fprintf(fp, "<icon size=%d,%d color-space=%d,%d,%d>\n<bitmap>\n",
115             img->height, img->width,
116             img->rbits, img->gbits, img->bbits);
117 }
118 
119 void
120 CHRPI_putfooter(FILE *fp, CHRPI_spec img)
121 {
122     fprintf(fp, "</bitmap>\n</icon>\n");
123 }
124 
125 
126 void
127 CHRPI_putbitmap(FILE *fp, pixel** pixels, CHRPI_spec img)
128 {
129     int row, col;
130     pixel *pP;
131 
132     for (row = 0; row < img->height; row++) {
133 
134         pixval r, g, b;
135         char pixbyte;
136 
137         pP = pixels[row];
138 
139         for (col = 0; col < img->width; col++) {
140 
141             r = PPM_GETR(*pP);
142             g = PPM_GETG(*pP);
143             b = PPM_GETB(*pP);
144 
145             pixbyte = (r & 0xe0)  | ((g >> 3) & 0x1c) | ((b >> 6) & 0x03);
146 
147             /* write the byte in hex */
148             fputc(hex_digits[(pixbyte>>4) & 0x0f], fp);
149             fputc(hex_digits[(pixbyte & 0x0f)], fp);
150 	    fputc(' ', fp);
151             pP++;
152 	    if ((col+1)%16 == 0)
153         	fputc('\n', fp);
154         }
155 
156     }
157 }
158