Geometry.c - rewrote my python box-packer algo in C,

packing 2400 rectanges is about 38x faster.

Use the C implimentation in uvcalc_lightmap and uvcalc_smart_project

Blender.c - filename returning None raises errors with existing scripts, just return "" so string functions on the filename dont raise an error.

source/blender/python/api2_2x/Geometry.h

@@ -39,4 +39,37 @@
 
 PyObject *Geometry_Init( void );
 
+
+/* Box Packer */
+typedef struct boxVert {
+	float x;
+	float y;
+	short free;
+	
+	struct boxPack *trb; /* top right box */
+	struct boxPack *blb; /* bottom left box */
+	struct boxPack *brb; /* bottom right box */
+	struct boxPack *tlb; /* top left box */
+	
+	/* Store last intersecting boxes here
+	 * speedup intersection testing */
+	struct boxPack *isect_cache[4];
+	
+	int index;
+} boxVert;
+
+
+typedef struct boxPack {
+	float x;
+	float y;
+	float w;
+	float h;
+	int index;
+	
+	/* Verts this box uses
+	 * (BL,TR,TL,BR) / 0,1,2,3 */
+	boxVert *v[4];
+} boxPack;
+
+
 #endif				/* EXPP_Geometry_H */