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1.1 nbrk 1: /* $OpenBSD: maskbits.h,v 1.1 2006/08/05 10:00:30 miod Exp $ */
2:
3: /*-
4: * Copyright (c) 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the University nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
31: * @(#)maskbits.h 8.2 (Berkeley) 3/21/94
32: */
33:
34: /*
35: * Derived from X11R4
36: */
37:
38: /* the following notes use the following conventions:
39: SCREEN LEFT SCREEN RIGHT
40: in this file and maskbits.c, left and right refer to screen coordinates,
41: NOT bit numbering in registers.
42:
43: rasops_lmask[n]
44: bits[0,n-1] = 0 bits[n,31] = 1
45: rasops_rmask[n] =
46: bits[0,n-1] = 1 bits[n,31] = 0
47:
48: maskbits(x, w, startmask, endmask, nlw)
49: for a span of width w starting at position x, returns
50: a mask for ragged bits at start, mask for ragged bits at end,
51: and the number of whole longwords between the ends.
52:
53: */
54:
55: #define maskbits(x, w, startmask, endmask, nlw) \
56: do { \
57: startmask = rasops_lmask[(x) & 0x1f]; \
58: endmask = rasops_rmask[((x) + (w)) & 0x1f]; \
59: if (startmask) \
60: nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \
61: else \
62: nlw = (w) >> 5; \
63: } while (0)
64:
65: #define FASTGETBITS(psrc,x,w,dst) \
66: __asm__ ("extzv %1,%2,%3,%0" \
67: : "=g" (dst) \
68: : "g" (x), "g" (w), "m" (*(char *)(psrc)))
69:
70: #define FASTPUTBITS(src, x, w, pdst) \
71: __asm__ ("insv %3,%1,%2,%0" \
72: : "=m" (*(char *)(pdst)) \
73: : "g" (x), "g" (w), "g" (src))
74:
75: #define RR_CLEAR 0x00
76: #define RR_SET 0x01
77: #define RR_COPY 0x02
78:
79: #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
80: do { \
81: unsigned int _tmpdst; \
82: switch (rop) { \
83: case RR_CLEAR: \
84: _tmpdst = 0; \
85: break; \
86: case RR_SET: \
87: _tmpdst = ~0; \
88: break; \
89: default: \
90: FASTGETBITS(psrc, srcbit, width, _tmpdst); \
91: break; \
92: } \
93: FASTPUTBITS(_tmpdst, dstbit, width, pdst); \
94: } while (0)
95:
96: #define getunalignedword(psrc, x, dst) \
97: do { \
98: int _tmp; \
99: FASTGETBITS(psrc, x, 32, _tmp); \
100: dst = _tmp; \
101: } while (0)