libgd/src/testtr.c

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

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

#define FALSE 0
#define TRUE (!FALSE)

int
main(void)
{
	int transparent, green, black;
	gdImagePtr im;

	im = gdImageCreateTrueColor(100,100);

	black =  gdImageColorResolveAlpha(im, 0, 0, 0, gdAlphaOpaque);
	green =  gdImageColorResolveAlpha(im, 0, gdGreenMax, 0, gdAlphaOpaque);
	transparent = gdImageColorResolveAlpha(im,
					       gdRedMax-1, gdGreenMax, gdBlueMax, gdAlphaTransparent);
	gdImageColorTransparent(im, transparent);

	/* Blending must be off to lay a transparent basecolor.
		    Nothing to blend with anyway. */
	gdImageAlphaBlending(im, FALSE);
	gdImageFill (im, im->sx/2, im->sy/2, transparent);
	/* Blend everything else together,
		especially fonts over non-transparent backgrounds */
	gdImageAlphaBlending(im, TRUE);

	gdImageFilledRectangle (im, 30, 30, 70, 70, green);
	gdImageStringFT (im, NULL, black, "Times", 18, 0, 50, 50, "Hello");

	gdImageSaveAlpha (im, TRUE);
#ifdef HAVE_LIBPNG
	{
		FILE *out = fopen("testtr.png", "wb");
		gdImagePng(im, out);
		fclose(out);
	}
#else
	fprintf(stderr, "Compiled without libpng support\n");
#endif /* HAVE_LIBPNG */
	gdImageDestroy (im);

	return 0;
}