/* 
**
**		ilbm.h
**
**		Definitions for ilbm.c
**
**		(c) 1996 The Beet Research
**		written by Grzegorz Calkowski
**
**		based on orginal iff stuff from C=
**
*/

#ifndef ILBM_H
#define ILBM_H

#include "iff.h"

/* ILBM Chunk ID's we may encounter */

#define	ID_ILBM		MAKE_ID('I','L','B','M')
#define	ID_BMHD		MAKE_ID('B','M','H','D')
#define	ID_CMAP		MAKE_ID('C','M','A','P')
#define	ID_CAMG		MAKE_ID('C','A','M','G')
/*#define	ID_BODY		MAKE_ID('B','O','D','Y')*/

/* Use this constant instead of sizeof(ColorRegister).
 * ONLY VALID FOR size of color register AS STORED in ILBM.CMAP
 */

#define sizeofColorRegister  3

typedef struct
{
	ULONG	r;
	ULONG	g;
	ULONG	b;
} Color32;

/* Maximum number of bitplanes storable in BitMap structure */

#define MAXAMDEPTH 8


/* Convert image width to even number of BytesPerRow for ILBM save.
 * Do NOT use this macro to determine the actual number of bytes per row
 * in an Amiga BitMap.  Use BitMap->BytesPerRow for scan-line modulo.
 * Use your screen or viewport width to determine width. Or under
 * V39, use GetBitMapAttr().
 */
#define RowBytes(w)	((((w) + 15) >> 4) << 1)
#define RowBits(w)	((((w) + 15) >> 4) << 4)

/* Flags that should be masked out of old 16-bit CAMG before save or use.
 * Note that 32-bit mode id (non-zero high word) bits should not be twiddled
 */
#define BADFLAGS (SPRITES|VP_HIDE|GENLOCK_AUDIO|GENLOCK_VIDEO)
#define OLDCAMGMASK (~BADFLAGS)

/*  Masking techniques  */
#define	mskNone			0
#define	mskHasMask		1
#define	mskHasTransparentColor	2
#define	mskLasso		3

/*  Compression techniques  */
#define	cmpNone			0
#define	cmpByteRun1		1

/* ---------- BitMapHeader ---------------------------------------------*/
/*  Required Bitmap header (BMHD) structure describes an ILBM */

typedef struct {
	UWORD	w, h;		/* Width, height in pixels */
	WORD	x, y;		/* x, y position for this bitmap  */
	UBYTE	nPlanes;	/* # of planes (not including mask) */
	UBYTE	masking;	/* a masking technique listed above */
	UBYTE	compression;	/* cmpNone or cmpByteRun1 */
	UBYTE	flags;		/* as defined or approved by Commodore */
	UWORD	transparentColor;
	UBYTE	xAspect, yAspect;
	WORD	pageWidth, pageHeight;
} BitMapHeader;

/* BMHD flags */

/* Advisory that 8 significant bits-per-gun have been stored in CMAP
 * i.e. that the CMAP is definitely not 4-bit values shifted left.
 * This bit will disable nibble examination by color loading routine.
 */
#define BMHDB_CMAPOK	7
#define BMHDF_CMAPOK	(1 << BMHDB_CMAPOK)

#endif