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