mirror of
git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-12-28 20:24:17 +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
/*
|
|
* ppm.c - Load a PPM image
|
|
*
|
|
* Written 2010-2011 by Werner Almesberger
|
|
* Copyright 2010-2011 Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "ppm.h"
|
|
|
|
|
|
static char *fgets_comment(char *line, int n, FILE *file)
|
|
{
|
|
do {
|
|
if (!fgets(line, n, file))
|
|
return NULL;
|
|
}
|
|
while (*line == '#');
|
|
return line;
|
|
}
|
|
|
|
|
|
uint8_t *load_ppm(const char *name, int *x, int *y)
|
|
{
|
|
FILE *file;
|
|
char line[100];
|
|
int this_x, this_y, depth;
|
|
int n;
|
|
uint8_t *img;
|
|
|
|
file = fopen(name, "r");
|
|
if (!file) {
|
|
perror(name);
|
|
exit(1);
|
|
}
|
|
if (!fgets_comment(line, sizeof(line), file)) {
|
|
fprintf(stderr, "can't read file type\n");
|
|
exit(1);
|
|
}
|
|
if (strcmp(line, "P6\n")) {
|
|
fprintf(stderr, "file type must be P6, not %s", line);
|
|
exit(1);
|
|
}
|
|
if (!fgets_comment(line, sizeof(line), file)) {
|
|
fprintf(stderr, "can't read resolution\n");
|
|
exit(1);
|
|
}
|
|
if (sscanf(line, "%d %d", &this_x, &this_y) != 2) {
|
|
fprintf(stderr, "can't parse resolution: %s", line);
|
|
exit(1);
|
|
}
|
|
if (*x || *y) {
|
|
if (*x != this_x || *y != this_y) {
|
|
fprintf(stderr,
|
|
"resolution changed from %dx%d to %dx%d\n",
|
|
*x, *y, this_x, this_y);
|
|
exit(1);
|
|
}
|
|
} else {
|
|
*x = this_x;
|
|
*y = this_y;
|
|
}
|
|
if (!fgets_comment(line, sizeof(line), file)) {
|
|
fprintf(stderr, "can't read depth\n");
|
|
exit(1);
|
|
}
|
|
if (sscanf(line, "%d", &depth) != 1) {
|
|
fprintf(stderr, "can't parse depth: %s", line);
|
|
exit(1);
|
|
}
|
|
if (depth != 255) {
|
|
fprintf(stderr, "depth must be 255, not %d\n", depth);
|
|
exit(1);
|
|
}
|
|
n = *x**y*3;
|
|
img = malloc(n);
|
|
if (!img) {
|
|
perror("malloc");
|
|
exit(1);
|
|
}
|
|
if (fread(img, 1, n, file) != n) {
|
|
fprintf(stderr, "can't read %d bytes\n", n);
|
|
exit(1);
|
|
}
|
|
fclose(file);
|
|
return img;
|
|
}
|