--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils/frminfo/png_write.cpp	Sun Jun 29 18:44:17 2008 +0000
@@ -0,0 +1,72 @@
+/***************************************************************************
+ *   Copyright (C) 2005-2006 by the FIFE Team                              *
+ *   fife-public@lists.sourceforge.net                                     *
+ *   This file is part of FIFE.                                            *
+ *                                                                         *
+ *   FIFE is free software; you can redistribute it and/or modify          *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA              *
+ ***************************************************************************/
+
+// Standard C++ library includes
+#include <cstdio>
+
+// 3rd party library includes
+#include <png.h>
+#include <SDL.h>
+
+// FIFE includes
+
+int write_png(const char *filename, SDL_Surface& surface) {
+	FILE *file = fopen(filename, "wb");
+	if (!file)
+		return -1;
+
+	png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (!png_ptr)
+		return -1;
+
+	png_infop info_ptr = png_create_info_struct(png_ptr);
+	if (!info_ptr) {
+		png_destroy_write_struct(&png_ptr, NULL);
+		fclose(file);
+		return -1;
+	}
+
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		png_destroy_write_struct(&png_ptr, &info_ptr);
+		fclose(file);
+		return -1;
+	}
+
+	png_init_io(png_ptr, file);
+
+	png_set_IHDR(png_ptr, info_ptr, surface.w, surface.h, 8, PNG_COLOR_TYPE_RGB_ALPHA ,
+			PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+	/* does this leak memory? */
+	png_byte** row_pointers = (png_byte**)png_malloc(png_ptr, surface.h * sizeof(png_bytep));
+	
+	png_byte* p = (png_byte*)surface.pixels;
+	for (int i = 0; i < surface.h; ++i) {
+		row_pointers[i] = p;
+		p += surface.pitch;
+	}
+
+	png_set_rows(png_ptr, info_ptr, row_pointers);
+
+	png_write_png(png_ptr, info_ptr, 0, NULL);
+
+	return 0;
+}