The Quake 2 tools as originally released under the GPL license.

common/lbmlib.h

@@ -0,0 +1,40 @@
+/*
+===========================================================================
+Copyright (C) 1997-2006 Id Software, Inc.
+
+This file is part of Quake 2 Tools source code.
+
+Quake 2 Tools source code 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.
+
+Quake 2 Tools source code 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 Quake 2 Tools source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+// piclib.h
+
+
+void LoadLBM (char *filename, byte **picture, byte **palette);
+void WriteLBMfile (char *filename, byte *data, int width, int height
+	, byte *palette);
+void LoadPCX (char *filename, byte **picture, byte **palette, int *width, int *height);
+void WritePCXfile (char *filename, byte *data, int width, int height
+	, byte *palette);
+
+// loads / saves either lbm or pcx, depending on extension
+void Load256Image (char *name, byte **pixels, byte **palette,
+				   int *width, int *height);
+void Save256Image (char *name, byte *pixels, byte *palette,
+				   int width, int height);
+
+
+void LoadTGA (char *filename, byte **pixels, int *width, int *height);