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/* $OpenBSD: maskbits.h,v 1.3 2017/11/03 06:54:06 aoyama Exp $ */
/* $NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)maskbits.h 8.2 (Berkeley) 3/21/94
*/
#include <luna88k/dev/omrasops.h> /* R(), W(), RR_* defines */
/* This file is derived from OpenBSD:/usr/src/sys/arch/hp300/dev/maskbits.h */
/*
* Derived from X11R4
*/
/* the following notes use the following conventions:
SCREEN LEFT SCREEN RIGHT
in this file and maskbits.c, left and right refer to screen coordinates,
NOT bit numbering in registers.
rasops_lmask[n]
bits[0,n-1] = 0 bits[n,31] = 1
rasops_rmask[n] =
bits[0,n-1] = 1 bits[n,31] = 0
maskbits(x, w, startmask, endmask, nlw)
for a span of width w starting at position x, returns
a mask for ragged bits at start, mask for ragged bits at end,
and the number of whole longwords between the ends.
*/
#define maskbits(x, w, startmask, endmask, nlw) \
do { \
startmask = rasops_lmask[(x) & 0x1f]; \
endmask = rasops_rmask[((x) + (w)) & 0x1f]; \
if (startmask) \
nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \
else \
nlw = (w) >> 5; \
} while (0)
/*
* On LUNA's frame buffer, MSB(bit 31) is displayed at most left hand of
* the screen. This is different from rasops_masks.{c,h} assumption.
* So we use our own MBL(Move Bit Left)/MBR(Move Bit Right) macros to
* handle display memory images.
*/
#define OMFB_MBL(x,y) ((y) > 31 ? 0 : (x) << (y))
#define OMFB_MBR(x,y) ((y) > 31 ? 0 : (x) >> (y))
/*
* And, our private version of GETBITS/PUTBITS.
* XXX: We consider only 1 bpp for now.
*/
/* Get a number of bits ( <= 32 ) from *sp and store in dw */
#define OMFB_GETBITS(sp, x, w, dw) \
do { \
dw = OMFB_MBL(*(sp), (x)); \
if (((x) + (w)) > 32) \
dw |= (OMFB_MBR(*(sp + 1), 32 - (x))); \
} while(0);
/* Put a number of bits ( <= 32 ) from sw to *dp */
#define OMFB_PUTBITS(sw, x, w, dp) \
do { \
int n = (x) + (w) - 32; \
\
if (n <= 0) { \
n = rasops_pmask[x & 31][w & 31]; \
*(dp) = (*(dp) & ~n) | (OMFB_MBR(sw, x) & n); \
} else { \
*(dp) = (*(dp) & rasops_rmask[x]) \
| (OMFB_MBR(sw, x)); \
*(dp + 1) = (*(dp + 1) & rasops_lmask[n]) \
| (OMFB_MBL(sw, 32-(x)) & rasops_rmask[n]); \
} \
} while(0);
#define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
do { \
u_int32_t _tmpdst; \
if (rop == RR_CLEAR) \
_tmpdst = 0; \
else \
OMFB_GETBITS(psrc, srcbit, width, _tmpdst); \
OMFB_PUTBITS(_tmpdst, dstbit, width, pdst); \
} while (0)
#define getunalignedword(psrc, x, dst) \
do { \
u_int32_t _tmp; \
OMFB_GETBITS(psrc, x, 32, _tmp); \
dst = _tmp; \
} while (0)
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