Added the header to the repo. Oops.

src/video/SDL_shape_internals.h

+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 2010 Eli Gottlieb
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Eli Gottlieb
+    eligottlieb@gmail.com
+*/
+
+#ifndef _SDL_shape_internals_h
+#define _SDL_shape_internals_h
+
+#include "SDL_rect.h"
+#include "SDL_shape.h"
+#include "SDL_surface.h"
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+/* *INDENT-OFF* */
+extern "C" {
+/* *INDENT-ON* */
+#endif
+
+typedef struct {
+	struct SDL_ShapeTree *upleft,*upright,*downleft,*downright;
+} SDL_QuadTreeChildren;
+
+typedef union {
+	SDL_QuadTreeChildren children;
+	SDL_Rect shape;
+} SDL_ShapeUnion;
+
+typedef enum { QuadShape,TransparentShape,OpaqueShape } SDL_ShapeKind;
+
+typedef struct {
+	SDL_ShapeKind kind;
+	SDL_ShapeUnion data;
+} SDL_ShapeTree;
+
+extern void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb,Uint8 value);
+extern SDL_ShapeTree* SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shape,SDL_bool invert);
+extern void SDL_TraverseShapeTree(SDL_ShapeTree *tree,void(*function)(SDL_ShapeTree*,void*),void* closure);
+extern void SDL_FreeShapeTree(SDL_ShapeTree** shapeTree);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+/* *INDENT-OFF* */
+}
+/* *INDENT-ON* */
+#endif
+#include "close_code.h"
+
+#endif