/* $Id$ */

#include "gd.h"

#include <stdio.h>

#include <stdlib.h>

void save_png(gdImagePtr im, const char *filename)

{

	FILE *fp;

	fp = fopen(filename, "wb");

	if (!fp) {

		fprintf(stderr, "Can't save png image %s\n", filename);

		return;

	}

#ifdef HAVE_LIBPNG

	gdImagePng(im, fp);

#else

	printf("No PNG support. Cannot save image.\n");

#endif

	fclose(fp);

}

gdImagePtr read_png(const char *filename)

{

	FILE * fp;

	gdImagePtr im;

	fp = fopen(filename, "rb");

	if (!fp) {

		fprintf(stderr, "Can't read png image %s\n", filename);

		return NULL;

	}

#ifdef HAVE_LIBPNG

	im = gdImageCreateFromPng(fp);

#else

	im = NULL;

	printf("No PNG support. Cannot read image.\n");

#endif

	fclose(fp);

	return im;

}

int main()

{

	gdImagePtr im, im2;

	im = gdImageCreateTrueColor(400, 400);

	if (!im) {

		fprintf(stderr, "Can't create 400x400 TC image\n");

		return 1;

	}

	gdImageFilledRectangle(im, 19, 29, 390, 390, 0xFFFFFF);

	gdImageRectangle(im, 19, 29, 390, 390, 0xFF0000);

	save_png(im, "a1.png");

	im2 = gdImageCropAuto(im, GD_CROP_SIDES);

	if (im2) {

		save_png(im2, "a2.png");

		gdImageDestroy(im2);

	}

	gdImageDestroy(im);

	im = read_png("test_crop_threshold.png");

	if (!im) {

		return 1;

	}

	im2 = gdImageCropThreshold(im, 0xFFFFFF, 0.6);

	if (im2) {

		save_png(im2, "a4.png");

		gdImageDestroy(im2);

	}

	gdImageDestroy(im);

	return 0;

}