117 lines
4.0 KiB
C
117 lines
4.0 KiB
C
/* $NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp $ */
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/*-
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)maskbits.h 8.2 (Berkeley) 3/21/94
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*/
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/*
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* Derived from X11R4
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*/
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/* the following notes use the following conventions:
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SCREEN LEFT SCREEN RIGHT
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in this file and maskbits.c, left and right refer to screen coordinates,
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NOT bit numbering in registers.
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starttab[n]
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bits[0,n-1] = 0 bits[n,31] = 1
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endtab[n] =
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bits[0,n-1] = 1 bits[n,31] = 0
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maskbits(x, w, startmask, endmask, nlw)
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for a span of width w starting at position x, returns
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a mask for ragged bits at start, mask for ragged bits at end,
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and the number of whole longwords between the ends.
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*/
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#define maskbits(x, w, startmask, endmask, nlw) \
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startmask = starttab[(x)&0x1f]; \
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endmask = endtab[((x)+(w)) & 0x1f]; \
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if (startmask) \
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nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \
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else \
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nlw = (w) >> 5;
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#define FASTGETBITS(psrc, x, w, dst) \
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asm ("bfextu %3{%1:%2},%0" \
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: "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc)))
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#define FASTPUTBITS(src, x, w, pdst) \
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asm ("bfins %3,%0{%1:%2}" \
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: "=o" (*(char *)(pdst)) \
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: "di" (x), "di" (w), "d" (src), "0" (*(char *) (pdst)))
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#define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
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{ \
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unsigned int _tmpsrc, _tmpdst; \
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FASTGETBITS(pdst, dstbit, width, _tmpdst); \
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FASTGETBITS(psrc, srcbit, width, _tmpsrc); \
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DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \
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FASTPUTBITS(_tmpdst, dstbit, width, pdst); \
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}
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#define getandputrop0(psrc, srcbit, width, pdst, rop) \
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getandputrop(psrc, srcbit, 0, width, pdst, rop)
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#define getunalignedword(psrc, x, dst) { \
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int _tmp; \
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FASTGETBITS(psrc, x, 32, _tmp); \
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dst = _tmp; \
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}
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#define fnCLEAR(src, dst) (0)
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#define fnCOPY(src, dst) (src)
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#define fnXOR(src, dst) (src ^ dst)
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#define fnCOPYINVERTED(src, dst)(~src)
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#define DoRop(result, alu, src, dst) \
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{ \
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if (alu == RR_COPY) \
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result = fnCOPY (src, dst); \
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else \
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switch (alu) \
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{ \
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case RR_CLEAR: \
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result = fnCLEAR (src, dst); \
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break; \
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case RR_XOR: \
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result = fnXOR (src, dst); \
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break; \
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case RR_COPYINVERTED: \
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result = fnCOPYINVERTED (src, dst); \
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break; \
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} \
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}
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