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annotate miscprog/fbdump2ppm.c @ 382:4307b57229d3

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miscprog: tone-convert written, compiles
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 10 Nov 2021 00:04:12 +0000
parents 81641d82ccc6
children
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f233f0a012c9 miscprog: fbdump2ppm program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program converts a dump of TI's R2D framebuffer (176x220 pix, 16-bit)
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3 * captured via fc-memdump into PPM format for viewing.
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4 *
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5 * TI's R2D code adds an extra 32-bit word to each horizontal line in its
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6 * framebuffer representation, hence one needs to capture 0x131F0 bytes
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7 * (178*2*220 instead of 176*2*220), and we treat the image as being
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8 * 178x220 pixels for simplicity.
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9 */
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10
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11 #include <sys/types.h>
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12 #include <stdio.h>
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13 #include <stdlib.h>
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14
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15 #define NPIX (178*220)
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16
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17 FILE *inf, *outf;
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18
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19 convert_pixel()
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20 {
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21 int i, c;
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22 u_char inb[2];
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23 unsigned pix16, r, g, b;
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24
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25 for (i = 0; i < 2; i++) {
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26 c = getc(inf);
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27 if (c < 0) {
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28 fprintf(stderr, "error: input is too short\n");
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29 exit(1);
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30 }
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31 inb[i] = c;
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32 }
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33 pix16 = (inb[0] | (inb[1] << 8)) ^ 0xFFFF;
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34 r = pix16 >> 11;
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35 g = (pix16 >> 5) & 0x3F;
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36 b = pix16 & 0x1F;
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37 putc(r << 3, outf);
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38 putc(g << 2, outf);
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39 putc(b << 3, outf);
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40 }
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41
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42 main(argc, argv)
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43 char **argv;
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44 {
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45 unsigned n;
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46
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47 if (argc != 3) {
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48 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
f233f0a012c9 miscprog: fbdump2ppm program written, compiles
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49 exit(1);
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50 }
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51 inf = fopen(argv[1], "r");
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52 if (!inf) {
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53 perror(argv[1]);
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54 exit(1);
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55 }
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56 outf = fopen(argv[2], "w");
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57 if (!outf) {
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58 perror(argv[2]);
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59 exit(1);
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60 }
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61 fprintf(outf, "P6\n178 220\n255\n");
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62 for (n = 0; n < NPIX; n++)
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63 convert_pixel();
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64 exit(0);
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65 }