1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)maskbits.h 8.2 (Berkeley) 3/21/94 34 * $Id: maskbits.h,v 1.1 1994/05/23 05:59:05 mycroft Exp $ 35 */ 36 37 /* 38 * Derived from X11R4 39 */ 40 41 /* the following notes use the following conventions: 42 SCREEN LEFT SCREEN RIGHT 43 in this file and maskbits.c, left and right refer to screen coordinates, 44 NOT bit numbering in registers. 45 46 starttab[n] 47 bits[0,n-1] = 0 bits[n,31] = 1 48 endtab[n] = 49 bits[0,n-1] = 1 bits[n,31] = 0 50 51 maskbits(x, w, startmask, endmask, nlw) 52 for a span of width w starting at position x, returns 53 a mask for ragged bits at start, mask for ragged bits at end, 54 and the number of whole longwords between the ends. 55 56 */ 57 58 #define maskbits(x, w, startmask, endmask, nlw) \ 59 startmask = starttab[(x)&0x1f]; \ 60 endmask = endtab[((x)+(w)) & 0x1f]; \ 61 if (startmask) \ 62 nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 63 else \ 64 nlw = (w) >> 5; 65 66 #define FASTGETBITS(psrc, x, w, dst) \ 67 asm ("bfextu %3{%1:%2},%0" \ 68 : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 69 70 #define FASTPUTBITS(src, x, w, pdst) \ 71 asm ("bfins %3,%0{%1:%2}" \ 72 : "=o" (*(char *)(pdst)) \ 73 : "di" (x), "di" (w), "d" (src), "0" (*(char *) (pdst))) 74 75 #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 76 { \ 77 register unsigned int _tmpsrc, _tmpdst; \ 78 FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 79 FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 80 DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 81 FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 82 } 83 84 #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 85 getandputrop(psrc, srcbit, 0, width, pdst, rop) 86 87 #define getunalignedword(psrc, x, dst) { \ 88 register int _tmp; \ 89 FASTGETBITS(psrc, x, 32, _tmp); \ 90 dst = _tmp; \ 91 } 92 93 #define fnCLEAR(src, dst) (0) 94 #define fnCOPY(src, dst) (src) 95 #define fnXOR(src, dst) (src ^ dst) 96 #define fnCOPYINVERTED(src, dst)(~src) 97 98 #define DoRop(result, alu, src, dst) \ 99 { \ 100 if (alu == RR_COPY) \ 101 result = fnCOPY (src, dst); \ 102 else \ 103 switch (alu) \ 104 { \ 105 case RR_CLEAR: \ 106 result = fnCLEAR (src, dst); \ 107 break; \ 108 case RR_XOR: \ 109 result = fnXOR (src, dst); \ 110 break; \ 111 case RR_COPYINVERTED: \ 112 result = fnCOPYINVERTED (src, dst); \ 113 break; \ 114 } \ 115 } 116