From 6af6be4632d25d2632ee7ebd0a8df5487e921609 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Sat, 24 Mar 2018 15:37:06 +0100
Subject: [PATCH] Re-add support for outdated libgd

---
 Image.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Image.cpp b/Image.cpp
index b5f0f02..0ae5dac 100644
--- a/Image.cpp
+++ b/Image.cpp
@@ -103,9 +103,22 @@ void Image::drawCircle(int x, int y, int diameter, const Color &c)
 
 void Image::save(const std::string &filename)
 {
+#if (GD_MAJOR_VERSION == 2 && GD_MINOR_VERSION >= 1 && GD_RELEASE_VERSION >= 1) || GD_MAJOR_VERSION > 2
 	const char *f = filename.c_str();
 	if (gdSupportsFileType(f, 1) == GD_FALSE)
 		throw std::runtime_error("Image format not supported by gd");
 	if (gdImageFile(m_image, f) == GD_FALSE)
 		throw std::runtime_error("Error saving image");
+#else
+	if (filename.compare(filename.length() - 4, 4, ".png") != 0)
+		throw std::runtime_error("Only PNG is supported");
+	FILE *f = fopen(filename.c_str(), "wb");
+	if (!f) {
+		std::ostringstream oss;
+		oss << "Error opening image file: " << std::strerror(errno);
+		throw std::runtime_error(oss.str());
+	}
+	gdImagePng(m_image, f);
+	fclose(f);
+#endif
 }