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diff --git a/gs/imdi/imdi_gen.h b/gs/imdi/imdi_gen.h
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+++ b/gs/imdi/imdi_gen.h
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+#ifndef IMDI_GEN_H
+#define IMDI_GEN_H
+
+/* Integer Multi-Dimensional Interpolation */
+/*
+ * Copyright 2000 - 2002 Graeme W. Gill
+ * All rights reserved.
+ *
+ * This material is licenced under the GNU GENERAL PUBLIC LICENCE :-
+ * see the Licence.txt file for licencing details.
+ */
+
+/* Kernel code generation definitions */
+
+#include "imdi.h"
+#include "arch.h"
+
+typedef enum {
+	invalid_dir = 0,
+	forward = 1,		/* 8 Bits per value, pixel interleaved, no padding */
+	backward = 2		/* 8 bits per value, plane interleaved */
+} imdi_dir;
+
+/* -------------------------------------------------- */
+/* High level kernel generation description */
+
+/* This sructure allows a series of related kernels to be generated, */
+/* the only variation being the number of input and output dimensions. */
+typedef struct {
+	int idcombs[10];	/* Input dimension combinations (0 at end) */
+	int itres[10];		/* Interpolation table resolutions for each input dimension */
+	int stres[10];		/* Simplex table resolutions for each input dimension */
+	int odcombs[10];	/* Output dimensions combinations (0 at end) */
+	imdi_pixrep incombs[10];/* Input pixel representation combinations */
+	imdi_pixrep outcombs[10];	/* Output pixel representation combinations */
+	imdi_dir dircombs[10];	/* Direction combinations (not implemented) */
+} gendesc;
+
+/* -------------------------------------------------- */
+/* Detailed level of generation specification */
+
+/* Pixel layout: */
+/* Each channel value is assumed to be read with a 		*/
+/* native machine single read of size bpch, 			*/
+/* and bov and bpv being bit indexes into that value.	*/
+/*                                        				*/
+/* If pint == 0, then each read will be of size bpch[], and will */
+/* have its own pointer, will be incremented by chi[].	*/
+/* If pint != 0, then the reads will be size bpch[0], from successive */
+/* locations, chi[] apart. 								*/
+/*                                        				*/
+/* If packed == 0, then separate reads are needed for each input */
+/* channel.												*/
+/* If packed != 0, then the channel values will be extracted */
+/* from a single read of size bpch[0]					*/
+/*                                        				*/
+/* Note that at all times the bit offset and size values */
+/* will be obeyed for each input value. 				*/
+
+typedef struct {
+	int bpch[IXDIDO];	/* Bits per channel read (must be divisible by 8) */
+	int chi[IXDIDO];	/* channel increment in multiples of bpch[] (0 == dimensionality) */
+	int bov[IXDIDO];	/* Bit offset to value within channel */
+	int	bpv[IXDIDO];	/* Bits per value within channel */
+	int pint;			/* Flag - nonz if pixel interleaved (ie. reads from successice locations) */
+	int packed;			/* Flag - nonz if all channels are packed into a single read */
+} pixlayout;
+
+/* Structure that specifies the configuration of a generated interpolation kernel. */
+typedef struct {
+	/* Input to code generator */
+	int prec;		/* Basic precision:- either 8 or 16 bits, determined by irep */ 
+	int id;			/* Number of input dimensions */
+	int od;			/* Number of output dimensions */
+	imdi_pixrep irep;/* Input pixel representation */
+	imdi_pixrep orep;/* Output pixel representation */
+	int in_signed;	/* Bit flag per channel, NZ if treat as signed (runtime setup) */
+	int out_signed;	/* Bit flag per channel, NZ if treat as signed (runtime setup) */
+	pixlayout in;	/* Input pixel layout */
+	pixlayout out;	/* Output pixel layout */
+	int dir;		/* forward or backward (not implemented */
+	int itres;		/* Interpolation table resolution */
+	int stres;		/* Simplex table resolution */
+
+	/* Returned value */
+	char kkeys[100];				/* Kernel keys */
+	char kdesc[100];				/* At genspec time */
+	char kname[100];				/* At generation time */
+} genspec;
+
+/* Supported code generators */
+
+int gen_c_kernel(genspec *g, mach_arch *a, FILE *fp, int index);	/* The 'C' code generator */
+
+/* asm, MMX, etc. generators declarations go here ! */
+
+#endif /* IMDI_GEN_H */
+
+
+
+
+
+
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+