mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-11-19 07:15:00 +02:00
080978ade0
- Makefile (OBJS): added ppm.o and ppmimg.o - ppm.h (load_ppm), ppm.c: PPM file loader, adapted from eda-tools/schhist/ppmdiff/ppmdiff.c - ubb-vga.h (img_name, ppmimg), ppmimg.c: PPM image to frame buffer converter - ubb-vga2.c (usage, main): the threshold is now set with the option -l - ubb-vga2.c (usage, main): if a second argument is given, treat it as a PPM file - ubb-vga2.c (usage): also documented option -t
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* ppm.c - Load a PPM image
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*
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* Written 2010-2011 by Werner Almesberger
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* Copyright 2010-2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "ppm.h"
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static char *fgets_comment(char *line, int n, FILE *file)
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{
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do {
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if (!fgets(line, n, file))
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return NULL;
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}
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while (*line == '#');
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return line;
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}
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uint8_t *load_ppm(const char *name, int *x, int *y)
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{
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FILE *file;
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char line[100];
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int this_x, this_y, depth;
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int n;
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uint8_t *img;
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file = fopen(name, "r");
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if (!file) {
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perror(name);
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exit(1);
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}
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if (!fgets_comment(line, sizeof(line), file)) {
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fprintf(stderr, "can't read file type\n");
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exit(1);
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}
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if (strcmp(line, "P6\n")) {
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fprintf(stderr, "file type must be P6, not %s", line);
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exit(1);
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}
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if (!fgets_comment(line, sizeof(line), file)) {
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fprintf(stderr, "can't read resolution\n");
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exit(1);
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}
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if (sscanf(line, "%d %d", &this_x, &this_y) != 2) {
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fprintf(stderr, "can't parse resolution: %s", line);
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exit(1);
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}
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if (*x || *y) {
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if (*x != this_x || *y != this_y) {
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fprintf(stderr,
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"resolution changed from %dx%d to %dx%d\n",
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*x, *y, this_x, this_y);
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exit(1);
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}
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} else {
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*x = this_x;
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*y = this_y;
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}
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if (!fgets_comment(line, sizeof(line), file)) {
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fprintf(stderr, "can't read depth\n");
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exit(1);
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}
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if (sscanf(line, "%d", &depth) != 1) {
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fprintf(stderr, "can't parse depth: %s", line);
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exit(1);
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}
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if (depth != 255) {
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fprintf(stderr, "depth must be 255, not %d\n", depth);
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exit(1);
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}
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n = *x**y*3;
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img = malloc(n);
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if (!img) {
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perror("malloc");
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exit(1);
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}
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if (fread(img, 1, n, file) != n) {
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fprintf(stderr, "can't read %d bytes\n", n);
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exit(1);
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}
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fclose(file);
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return img;
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}
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