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	ccl_device_inline int coord_to_local_index(int4 rect, int x, int y)			ccl_device_inline int coord_to_local_index(int4 rect, int x, int y)
	{			{
	int w = rect.z - rect.x;			int w = rect.z - rect.x;
	return (y - rect.y) * w + (x - rect.x);			return (y - rect.y) * w + (x - rect.x);
	}			}

	/* Finds the coordinates of a pixel given by its row-major index in the rect,			/* Finds the coordinates of a pixel given by its row-major index in the rect,
	* and returns whether the pixel is inside it. */			* and returns whether the pixel is inside it. */
	ccl_device_inline bool local_index_to_coord(int4 rect, int idx, int x, int y)			ccl_device_inline bool local_index_to_coord(int4 rect,
				int idx,
				ccl_private int *x,
				ccl_private int *y)
	{			{
	int w = rect.z - rect.x;			int w = rect.z - rect.x;
	*x = (idx % w) + rect.x;			*x = (idx % w) + rect.x;
	*y = (idx / w) + rect.y;			*y = (idx / w) + rect.y;
	return (*y < rect.w);			return (*y < rect.w);
	}			}

	ccl_device_inline int rect_size(int4 rect)			ccl_device_inline int rect_size(int4 rect)
	{			{
	return (rect.z - rect.x) * (rect.w - rect.y);			return (rect.z - rect.x) * (rect.w - rect.y);
	}			}

	CCL_NAMESPACE_END			CCL_NAMESPACE_END

	#endif /* __UTIL_RECT_H__ */			#endif /* __UTIL_RECT_H__ */