sdist and install now work

next step is using a custom data dir, and falling back on the package
data dir. Also, fixing --version.

overviewer_core/src/overviewer.h

@@ -0,0 +1,86 @@
+/* 
+ * This file is part of the Minecraft Overviewer.
+ *
+ * Minecraft Overviewer 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 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Minecraft Overviewer 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 the Overviewer.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This is a general include file for the Overviewer C extension. It
+ * lists useful, defined functions as well as those that are exported
+ * to python, so all files can use them.
+ */
+
+#ifndef __OVERVIEWER_H_INCLUDED__
+#define __OVERVIEWER_H_INCLUDED__
+
+/* Python PIL, and numpy headers */
+#include <Python.h>
+#include <Imaging.h>
+#include <numpy/arrayobject.h>
+
+/* macro for getting a value out of various numpy arrays */
+#define getArrayByte3D(array, x,y,z) (*(unsigned char *)(PyArray_GETPTR3((array), (x), (y), (z))))
+#define getArrayShort1D(array, x) (*(unsigned short *)(PyArray_GETPTR1((array), (x))))
+
+/* generally useful MAX / MIN macros */
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+/* in composite.c */
+Imaging imaging_python_to_c(PyObject *obj);
+PyObject *alpha_over(PyObject *dest, PyObject *src, PyObject *mask,
+                     int dx, int dy, int xsize, int ysize);
+PyObject *alpha_over_full(PyObject *dest, PyObject *src, PyObject *mask, float overall_alpha,
+                          int dx, int dy, int xsize, int ysize);
+PyObject *alpha_over_wrap(PyObject *self, PyObject *args);
+PyObject *tint_with_mask(PyObject *dest, unsigned char sr, unsigned char sg, unsigned char sb,
+                         PyObject *mask, int dx, int dy, int xsize, int ysize);
+
+/* in iterate.c */
+typedef struct {
+    /* the ChunkRenderer object */
+    PyObject *self;
+    
+    /* important modules, for convenience */
+    PyObject *textures;
+    PyObject *chunk;
+    
+    /* the rest only make sense for occluded() and draw() !! */
+    
+    /* the tile image and destination */
+    PyObject *img;
+    int imgx, imgy;
+    
+    /* the block position and type, and the block array */
+    int x, y, z;
+    unsigned char block;
+    PyObject *blocks;
+    PyObject *up_left_blocks;
+    PyObject *up_right_blocks;
+    PyObject *left_blocks;
+    PyObject *right_blocks;
+} RenderState;
+int init_chunk_render(void);
+int is_transparent(unsigned char b);
+PyObject *chunk_render(PyObject *self, PyObject *args);
+
+/* pull in the rendermode info */
+#include "rendermodes.h"
+
+/* in endian.c */
+void init_endian(void);
+unsigned short big_endian_ushort(unsigned short in);
+unsigned int big_endian_uint(unsigned int in);
+
+#endif /* __OVERVIEWER_H_INCLUDED__ */