/**

 * Regression test for <https://github.com/libgd/libgd/issues/338>

 *

 * We're testing that writing a PNG image with an unsupported quality

 * raises a GD_WARNING for the fatal libpng error, but not a GD_ERROR.

 * We also make sure, that the fatal libpng error is actually reported.

 *

 * See also ../jpeg/bug00338.c

 */

#include <string.h>

#include "gd.h"

#include "gd_errors.h"

#include "gdtest.h"

#define MSG "gd-png: fatal libpng error: %s\n"

static int error_handler_called = 0;

static void error_handler(int priority, const char *format, va_list args)

{

    if (!strcmp(format, MSG)) {

        gdTestAssertMsg(priority == GD_WARNING, "expected priority %d, but got %d", GD_WARNING, priority);

        error_handler_called = 1;

    }

}

int main()

{

    gdImagePtr im;

    FILE *fp;

    gdSetErrorMethod(error_handler);

    im = gdImageCreateTrueColor(10, 10);

    fp = gdTestTempFp();

    gdImagePngEx(im, fp, 100);

    gdImageDestroy(im);

    gdTestAssert(error_handler_called);

    return gdNumFailures();

}