meillo@0: /* compile with: gcc -lgd -lpng -lz -ljpeg  -lm resize-gd.c  */
meillo@0: 
meillo@0: #include <stdio.h>
meillo@0: #include <stdlib.h>  /* for atoi() */
meillo@0: #include <string.h>
meillo@0: #include "gd.h" /* Bring in the gd library functions */
meillo@0: 
meillo@0: 
meillo@0: enum {
meillo@0: 	Png,
meillo@0: 	Jpg,
meillo@0: };
meillo@0: 
meillo@0: 
meillo@0: int main(int argc, char* argv[]) {
meillo@0: 	int i;
meillo@0: 	int w, h;
meillo@0: 	int x, y;
meillo@0: 	int type;
meillo@0: 	gdImagePtr im_in;
meillo@0: 	gdImagePtr im_out;
meillo@0: 	FILE* in;
meillo@0: 	FILE* out;
meillo@0: 
meillo@0: 	if (argc < 3) {
meillo@0: 		puts("usage: resize-gd <width>x<height> <imagefiles>");
meillo@0: 		exit(1);
meillo@0: 	}
meillo@0: 
meillo@0: 	/* parse width and height */
meillo@0: 	w = atoi(argv[1]);
meillo@0: 	h = atoi(strstr(argv[1], "x") + 1);
meillo@0: 	printf("w: %d  h: %d\n", w, h);
meillo@0: 
meillo@0: 	/* process images */
meillo@0: 	for (i = 2; i < argc; i++) {
meillo@0: 		printf("processing file '%s'\n", argv[i]);
meillo@0: 
meillo@0: 		if (strcmp(&(argv[i][strlen(argv[i])-4]), ".png") == 0) {
meillo@0: 			type = Png;
meillo@0: 		} else if (strcmp(&(argv[i][strlen(argv[i])-4]), ".jpg") == 0) {
meillo@0: 			type = Jpg;
meillo@0: 		} else {
meillo@0: 			fprintf(stderr, "unknown filetype\n");
meillo@0: 			exit(2);
meillo@0: 		}
meillo@0: 
meillo@0: 		/* Load a large png to shrink in the smaller one */
meillo@0: 		in = fopen(argv[i], "rb");
meillo@0: 		if (type == Png) {
meillo@0: 			im_in = gdImageCreateFromPng(in);
meillo@0: 		} else if (type == Jpg) {
meillo@0: 			im_in = gdImageCreateFromJpeg(in);
meillo@0: 		}
meillo@0: 		fclose(in);
meillo@0: 
meillo@0: 		im_out = gdImageCreateTrueColor(w, h);
meillo@0: 
meillo@0: 		/* Now copy the large image */
meillo@0: 		gdImageCopyResampled(im_out, im_in, 0, 0, 0, 0, im_out->sx, im_out->sy, im_in->sx, im_in->sy);
meillo@0: 
meillo@0: 		/* write out */
meillo@0: 		out = fopen(argv[i], "wb");
meillo@0: 		if (type == Png) {
meillo@0: 			gdImagePng(im_out, out);
meillo@0: 		} else if (type == Jpg) {
meillo@0: 			gdImageJpeg(im_out, out, -1);
meillo@0: 		}
meillo@0: 		fclose(out);
meillo@0: 
meillo@0: 		gdImageDestroy(im_in);
meillo@0: 		gdImageDestroy(im_out);
meillo@0: 	}
meillo@0: 
meillo@0: 	return 0;
meillo@0: }