113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <malloc.h>
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#include "config.h"
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int imgwidth, imgheight;
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unsigned char *imgdata;
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#define PBM 0
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#define PGM 1
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#define PPM 2
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int load_image(char *name)
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{
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char data[65536];
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int i, c, max;
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int raw = 0;
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int type;
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FILE *file;
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if (name[0]=='\0') {
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#ifdef HAVE_ISATTY
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if (isatty(STDIN_FILENO)) {
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printf("Missing filename.\n Use --help for list of options.\n");
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return 0;
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}
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#endif
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file = stdin;
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}
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else {
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if ((file = fopen(name, "rb")) == NULL) {
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printf("File not found\n");
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return 0;
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}
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}
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if (getc(file) != 'P') {
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printf("Invalid magic-not p?m family format\n");
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return 0;
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}
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c = getc(file);
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if (c < '1' || c > '6') {
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printf("Invalid magic-unknown p?m family format\n");
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return 0;
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}
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if (c >= '4')
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raw = 1, c -= 3;
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type = c - '1';
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c = getc(file);
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while (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '#') {
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if (c == '#')
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fgets(data, 65536, file);
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c = getc(file);
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}
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ungetc(c, file);
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if (fscanf(file, "%i %i", &imgwidth, &imgheight) != 2) {
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printf("Parse error\n");
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return 0;
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}
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switch (type) {
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case PGM:
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case PPM:
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if (fscanf(file, "%i", &max) != 1) {
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printf("Parse error\n");
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return 0;
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}
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break;
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case PBM:
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max=1;
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break;
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}
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c = getc(file);
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if ((imgdata = malloc(imgwidth * imgheight)) == NULL) {
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printf("Out of memory\n");
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return 0;
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}
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if (!raw) {
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if(type==PPM) {
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int r,g,b;
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for (i = 0; i < imgwidth * imgheight; i++)
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fscanf(file, "%i %i %i", &r,&g,&b),
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imgdata[i]=(r*76+g*150+b*29)/max;
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max=255;
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} else
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for (i = 0; i < imgwidth * imgheight; i++)
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fscanf(file, "%i\n", &c), imgdata[i] = c;
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} else {
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if(type==PBM) {
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for(i=0;i<imgwidth*imgheight;)
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{int n;
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c=getc(file);
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for(n=128;n&&i<imgwidth*imgheight;n>>=1,i++)
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imgdata[i]=(n&c)!=0;
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}
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} else
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if(type==PPM) {
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for(i=0;i<imgwidth*imgheight;i++)
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{
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int r,g,b;
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r=getc(file);
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g=getc(file);
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b=getc(file);
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imgdata[i]=(r*76+g*150+b*29)/max;
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}
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max=255;
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} else
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fread(imgdata, 1, imgwidth * imgheight, file);
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}
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for (i = 0; i < imgwidth * imgheight; i++)
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imgdata[i] = imgdata[i] * 255 / max;
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if (name[0]!='\0') fclose(file);
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return 1;
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}
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