The GtkRadiant sources as originally released under the GPL license.

radiant/surfacedialog.h

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+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_SURFACEDIALOG_H)
+#define INCLUDED_SURFACEDIALOG_H
+
+
+void SurfaceInspector_Construct();
+void SurfaceInspector_Destroy();
+
+typedef struct _GtkWidget GtkWidget;
+typedef struct _GtkWindow GtkWindow;
+void SurfaceInspector_constructWindow(GtkWindow* widget);
+void SurfaceInspector_destroyWindow();
+
+
+// the increment we are using for the surface inspector (this is saved in the prefs)
+struct si_globals_t
+{
+  float shift[2];
+  float scale[2];
+  float rotate;
+
+  bool m_bSnapTToGrid;
+
+  si_globals_t() : m_bSnapTToGrid(false)
+  {
+    shift[0] = 8.0f;
+    shift[1] = 8.0f;
+    scale[0] = 0.5f;
+    scale[1] = 0.5f;
+    rotate = 45.0f;
+  }
+};
+extern si_globals_t g_si_globals;
+
+#endif