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/************************************************************
Copyright 1987 by Sun Microsystems, Inc. Mountain View, CA.

                    All Rights Reserved

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software  and  its documentation for any purpose and without
fee is hereby granted, provided that the above copyright no-
tice  appear  in all copies and that both that copyright no-
tice and this permission notice appear in  supporting  docu-
mentation,  and  that the names of Sun or MIT not be used in
advertising or publicity pertaining to distribution  of  the
software  without specific prior written permission. Sun and
M.I.T. make no representations about the suitability of this
software for any purpose. It is provided "as is" without any
express or implied warranty.

SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO  THIS  SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT-
NESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SUN BE  LI-
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/* $Header: /var/lib/cvsd/repos/research/researchv9/X11/src/X.V11R1/server/ddx/cfb/cfbmskbits.c,v 1.1.1.1 2018/04/24 17:22:00 root Exp $ */

/*
 * ==========================================================================
 * Converted to Color Frame Buffer by smarks@sun, April-May 1987.  The "bit 
 * numbering" in the doc below really means "byte numbering" now.
 * ==========================================================================
 */

/*
   these tables are used by several macros in the cfb code.

   the vax numbers everything left to right, so bit indices on the
screen match bit indices in longwords.  the pc-rt and Sun number
bits on the screen the way they would be written on paper,
(i.e. msb to the left), and so a bit index n on the screen is
bit index 32-n in a longword

   see also cfbmskbits.h
*/
#include	<X.h>
#include	<Xmd.h>
#include	<servermd.h>

#if	(BITMAP_BIT_ORDER == MSBFirst)
/* NOTE:
the first element in starttab could be 0xffffffff.  making it 0
lets us deal with a full first word in the middle loop, rather
than having to do the multiple reads and masks that we'd
have to do if we thought it was partial.
*/
int cfbstarttab[] =
    {
	0x00000000,
	0x00FFFFFF,
	0x0000FFFF,
	0x000000FF
    };

int cfbendtab[] =
    {
	0x00000000,
	0xFF000000,
	0xFFFF0000,
	0xFFFFFF00
    };

/* a hack, for now, since the entries for 0 need to be all
   1 bits, not all zeros.
   this means the code DOES NOT WORK for segments of length
   0 (which is only a problem in the horizontal line code.)
*/
int cfbstartpartial[] =
    {
	0xFFFFFFFF,
	0x00FFFFFF,
	0x0000FFFF,
	0x000000FF
    };

int cfbendpartial[] =
    {
	0xFFFFFFFF,
	0xFF000000,
	0xFFFF0000,
	0xFFFFFF00
    };
#else		/* (BITMAP_BIT_ORDER == LSBFirst) */
/* NOTE:
the first element in starttab could be 0xffffffff.  making it 0
lets us deal with a full first word in the middle loop, rather
than having to do the multiple reads and masks that we'd
have to do if we thought it was partial.
*/
int cfbstarttab[] = 
	{
	0x00000000,
	0xFFFFFF00,
	0xFFFF0000,
	0xFF000000
	};

int cfbendtab[] = 
	{
	0x00000000,
	0x000000FF,
	0x0000FFFF,
	0x00FFFFFF
	};

/* a hack, for now, since the entries for 0 need to be all
   1 bits, not all zeros.
   this means the code DOES NOT WORK for segments of length
   0 (which is only a problem in the horizontal line code.)
*/
int cfbstartpartial[] = 
	{
	0xFFFFFFFF,
	0xFFFFFF00,
	0xFFFF0000,
	0xFF000000
	};

int cfbendpartial[] = 
	{
	0xFFFFFFFF,
	0x000000FF,
	0x0000FFFF,
	0x00FFFFFF
	};
#endif	(BITMAP_BIT_ORDER == MSBFirst)


/* used for masking bits in bresenham lines
   mask[n] is used to mask out all but bit n in a longword (n is a
screen position).
   rmask[n] is used to mask out the single bit at position n (n
is a screen posiotion.)
*/

#if	(BITMAP_BIT_ORDER == MSBFirst)
int cfbmask[] =
    {
	0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
    }; 
int cfbrmask[] = 
    {
	0x00FFFFFF, 0xFF00FFFF, 0xFFFF00FF, 0xFFFFFF00
    };
#else	/* (BITMAP_BIT_ORDER == LSBFirst) */
int cfbmask[] =
    {
	0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
    }; 
int cfbrmask[] = 
    {
	0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF, 0x00FFFFFF
    };
#endif	(BITMAP_BIT_ORDER == MSBFirst)

#ifdef	vax
#undef	VAXBYTEORDER
#endif

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