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ppmtochrpicon.c revision 1.2 
      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