1 files changed, 44 insertions, 0 deletions
diff --git a/tests/png/bug00338.c b/tests/png/bug00338.c
new file mode 100644
index 0000000..f439d8c
--- /dev/null
+++ b/tests/png/bug00338.c
@@ -0,0 +1,44 @@
+/**
+ * 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);
+	fclose(fp);
+
+	gdTestAssert(error_handler_called);
+
+	return gdNumFailures();
+}