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| 1 | /* |
| 2 | * ppmimg.c - Convert a PPM image |
| 3 | * |
| 4 | * Written 2011 by Werner Almesberger |
| 5 | * Copyright 2011 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdint.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <stdio.h> |
| 17 | |
| 18 | #include "ppm.h" |
| 19 | #include "ubb-vga.h" |
| 20 | |
| 21 | |
| 22 | char *img_name; |
| 23 | |
| 24 | |
| 25 | static void convert(void **f, int xres, int yres, uint8_t *ppm) |
| 26 | { |
| 27 | int x, y; |
| 28 | uint8_t *p; |
| 29 | uint8_t v, last = 0; |
| 30 | |
| 31 | for (y = 0; y != yres; y++) { |
| 32 | p = f[y]; |
| 33 | for (x = 0; x != xres; x++) { |
| 34 | v = ccube_map(ppm[0], ppm[1], ppm[2]); |
| 35 | if (x & 1) { |
| 36 | *p++ = last | v; |
| 37 | } else { |
| 38 | last = v << 4; |
| 39 | } |
| 40 | ppm += 3; |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | |
| 46 | void ppmimg(void **f, int xres, int yres) |
| 47 | { |
| 48 | uint8_t *ppm; |
| 49 | int xr = 0, yr = 0; |
| 50 | |
| 51 | ppm = load_ppm(img_name, &xr, &yr); |
| 52 | if (xr != xres || yr != yres) { |
| 53 | fprintf(stderr, "image is %dx%d, display is %dx%d\n", |
| 54 | xr, yr, xres, yres); |
| 55 | exit(1); |
| 56 | } |
| 57 | convert(f, xres, yres, ppm); |
| 58 | free(ppm); |
| 59 | } |
| 60 |
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