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annotate lunalcd/ppmtoimg.c @ 176:fb2f6497ba53 default tip

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doc/Linux-DTR-RTS-flaw: point to new location of this article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Dec 2023 19:37:20 +0000
parents 1e6f05ede5ca
children
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69
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 * This program converts a 176x220 pixel wallpaper image from PPM format
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 * into a raw binary image file that will be written into an ad hoc flash
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 * location with fc-loadtool; these images will then be displayed on our
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 * Luna LCD by a standalone target-utils program.
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 */
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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7
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 #include <ctype.h>
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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11
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 static char *ppm_filename;
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 static FILE *ppmfile;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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14 static int ppm_is_ascii; /* P3 format instead of P6 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 /*
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 * This function reads one ASCII-encoded integer from a PPM file.
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 * It handles the white space and comment rules of the PPM format.
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 */
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 static int
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 ppm_get_ascii_number()
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Mychaela Falconia <falcon@freecalypso.org>
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22 {
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 int accum, c;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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24
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 do {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 c = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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27 if (c < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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28 badeof: fprintf(stderr, "%s: unexpected EOF\n", ppm_filename);
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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29 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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31 if (c == '#') {
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Mychaela Falconia <falcon@freecalypso.org>
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32 do
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Mychaela Falconia <falcon@freecalypso.org>
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33 c = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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34 while (c >= 0 && c != '\n');
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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35 if (c != '\n')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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36 goto badeof;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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37 }
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Mychaela Falconia <falcon@freecalypso.org>
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38 } while (isspace(c));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 if (!isdigit(c)) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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40 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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41 "%s: unexpected data where a number was expected\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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42 ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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43 return(-1);
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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44 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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45 for (accum = c - '0'; ; ) {
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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46 c = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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47 if (c < 0 || isspace(c))
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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48 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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49 if (!isdigit(c)) {
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 fprintf(stderr,
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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51 "%s: bad character in the middle of a number\n",
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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54 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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55 accum = accum * 10 + c - '0';
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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56 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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57 return accum;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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61 * This function reads and parses the PPM header of our input file.
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
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62 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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63 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 ppm_read_header()
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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65 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 int magic1, magic2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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67 int rd;
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parents:
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68
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parents:
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69 magic1 = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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70 magic2 = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 if (magic1 == 'P' && magic2 == '3')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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72 ppm_is_ascii = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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73 else if (magic1 == 'P' && magic2 == '6')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 ppm_is_ascii = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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75 else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 fprintf(stderr, "%s: P3 or P6 format expected\n", ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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77 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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78 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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79 rd = ppm_get_ascii_number();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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80 if (rd < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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81 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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82 if (rd != 176) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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83 fprintf(stderr, "%s: width is not 176\n", ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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84 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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85 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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86 rd = ppm_get_ascii_number();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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87 if (rd < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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88 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 if (rd != 220) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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90 fprintf(stderr, "%s: height is not 220\n", ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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92 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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93 rd = ppm_get_ascii_number();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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94 if (rd < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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96 if (rd != 255) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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97 fprintf(stderr, "%s: maxval is not 255\n", ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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98 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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103 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 * This function reads a single R, G or B value from a PPM file.
1e6f05ede5ca lunalcd: ppmtoimg utility added
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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106 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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107 ppm_get_pixval()
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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108 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 int c;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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111 if (ppm_is_ascii)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 return ppm_get_ascii_number();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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113 c = getc(ppmfile);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 if (c < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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115 fprintf(stderr, "%s: EOF while reading binary pixel data\n",
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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116 ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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117 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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119 return c;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 ppm_get_rgb()
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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125 int r, g, b;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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126
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 r = ppm_get_pixval();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 if (r < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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129 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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130 g = ppm_get_pixval();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 if (g < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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132 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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133 b = ppm_get_pixval();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 if (b < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 /* convert to 5:6:5 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 r >>= 3;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 g >>= 2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 b >>= 3;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 return (r << 11) | (g << 5) | b;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 main(argc, argv)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 char **argv;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 FILE *of;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 unsigned n;
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Mychaela Falconia <falcon@freecalypso.org>
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149
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Mychaela Falconia <falcon@freecalypso.org>
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150 if (argc != 3) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 fprintf(stderr, "usage: %s ppmfile binfile\n", argv[0]);
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parents:
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152 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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153 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 ppm_filename = argv[1];
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 ppmfile = fopen(ppm_filename, "r");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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156 if (!ppmfile) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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157 perror(ppm_filename);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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158 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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159 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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160 rc = ppm_read_header();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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161 if (rc < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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162 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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163 of = fopen(argv[2], "w");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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164 if (!of) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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165 perror(argv[2]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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166 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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167 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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168 for (n = 0; n < 176*220; n++) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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169 rc = ppm_get_rgb();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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170 if (rc < 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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171 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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172 putc(rc & 0xFF, of);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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173 putc(rc >> 8, of);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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174 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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175 fclose(of);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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176 exit(0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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177 }