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/* $OpenBSD: maskbits.h,v 1.1 2006/08/05 10:00:30 miod 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
*/
/*
* 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)
#define FASTGETBITS(psrc,x,w,dst) \
__asm__ ("extzv %1,%2,%3,%0" \
: "=g" (dst) \
: "g" (x), "g" (w), "m" (*(char *)(psrc)))
#define FASTPUTBITS(src, x, w, pdst) \
__asm__ ("insv %3,%1,%2,%0" \
: "=m" (*(char *)(pdst)) \
: "g" (x), "g" (w), "g" (src))
#define RR_CLEAR 0x00
#define RR_SET 0x01
#define RR_COPY 0x02
#define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
do { \
unsigned int _tmpdst; \
switch (rop) { \
case RR_CLEAR: \
_tmpdst = 0; \
break; \
case RR_SET: \
_tmpdst = ~0; \
break; \
default: \
FASTGETBITS(psrc, srcbit, width, _tmpdst); \
break; \
} \
FASTPUTBITS(_tmpdst, dstbit, width, pdst); \
} while (0)
#define getunalignedword(psrc, x, dst) \
do { \
int _tmp; \
FASTGETBITS(psrc, x, 32, _tmp); \
dst = _tmp; \
} while (0)
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