gd-libgd / tests / png / png_resolution.c

#include "gd.h"
#include <stdio.h>
#include <stdlib.h>
#include "gdtest.h"

int main()
	gdImagePtr im;
	void *data;
	int size, red;

	im = gdImageCreate(100, 100);
	gdImageSetResolution(im, 72, 300);
	red = gdImageColorAllocate(im, 0xFF, 0x00, 0x00);
	gdImageFilledRectangle(im, 0, 0, 99, 99, red);
	data = gdImagePngPtr(im, &size);

	im = gdImageCreateFromPngPtr(size, data);

	if (!gdTestAssert(gdImageResolutionX(im) == 72) || !gdTestAssert(gdImageResolutionY(im) == 300)) {
		gdTestErrorMsg("failed image resolution X (%d != 72) or Y (%d != 300)\n", gdImageResolutionX(im), gdImageResolutionY(im));
		return 1;
	return 0;
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