GRAPHICS: Updated the copyright information regarding LodePNG. Removed the obsolete reference to ysflight, as no code is actually used from or based on that project

svn-id: r55726

graphics/png.cpp

@@ -33,6 +33,36 @@
 #include "common/util.h"
 #include "common/zlib.h"
 
+// PNG decoder, based on the W3C specs:
+// http://www.w3.org/TR/PNG/
+// Parts of the code have been adapted from LodePNG, by Lode Vandevenne:
+// http://members.gamedev.net/lode/projects/LodePNG/
+
+/*
+LodePNG version 20101211
+
+Copyright (c) 2005-2010 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
 namespace Graphics {
 
 enum PNGChunks {

graphics/png.h

@@ -35,10 +35,8 @@
 
 // PNG decoder, based on the W3C specs:
 // http://www.w3.org/TR/PNG/
-// and lodePNG:
+// Parts of the code have been adapted from LodePNG, by Lode Vandevenne:
 // http://members.gamedev.net/lode/projects/LodePNG/
-// and the ysflight PNG decoder:
-// http://homepage3.nifty.com/ysflight/pngdecoder/pngdecodere.html
 
 // All the numbers are BE: http://www.w3.org/TR/PNG/#7Integers-and-byte-order