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#include "gd.h"
#include <stdio.h>
#include <stdlib.h>
gdImagePtr loadImage(const char *name)
{
FILE *fp;
gdImagePtr im;
fp = fopen(name, "rb");
if (!fp) {
fprintf(stderr, "Can't open jpeg file\n");
return NULL;
}
im = gdImageCreateFromJpeg(fp);
fclose(fp);
return im;
}
int savePngImage(gdImagePtr im, const char *name)
{
FILE *fp;
fp = fopen(name, "wb");
if (!fp) {
fprintf(stderr, "Can't save png image fromtiff.png\n");
return 0;
}
gdImagePng(im, fp);
fclose(fp);
return 1;
}
int main(int argc, char **arg)
{
gdImagePtr im;
int returncode = 0;
if (argc < 2) {
fprintf(stderr, "Usage: flip [filename.png]\n");
return 1;
}
im = loadImage(arg[1]);
if (!im) goto error;
gdImageFlipHorizontal(im);
if (!savePngImage(im, "flip_horizontal.png")) {
goto error;
}
gdImageDestroy(im);
im = loadImage(arg[1]);
if (!im) goto error;
gdImageFlipVertical(im);
if (!savePngImage(im, "flip_vertical.png")) {
goto error;
}
gdImageDestroy(im);
im = loadImage(arg[1]);
if (!im) goto error;
gdImageFlipBoth(im);
if (!savePngImage(im, "flip_both.png")) {
goto error;
}
gdImageDestroy(im);
goto done;
error:
returncode = 1;
done:
return returncode;
}
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