75 lines
3.2 KiB
C
75 lines
3.2 KiB
C
/*
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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, Lawrence Berkeley Laboratory.
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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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* %W% (Berkeley) %G%
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*
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* from: Header: btvar.h,v 1.1 93/10/12 15:29:01 torek Exp
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* $Id: btvar.h,v 1.1 1993/11/11 03:36:51 deraadt Exp $
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*/
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/*
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* Brooktree color frame buffer state variables (see btreg.h).
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*
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* Unfortunately, remarkably little code can be shared between the
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* cg3 and cg6 drivers here, as the cg3 registers do longword-ops
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* `as expected', but the cg6 ones use only the upper byte.
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*
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* Still, the software color map manipulation is not completely trivial.
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*/
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union bt_cmap {
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u_char cm_map[256][3]; /* 256 R/G/B entries */
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u_int cm_chip[256 * 3 / 4]; /* the way the chip gets loaded */
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};
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/*
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* Routines in bt_subr.c.
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*/
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int bt_getcmap __P((struct fbcmap *, union bt_cmap *, int));
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int bt_putcmap __P((struct fbcmap *, union bt_cmap *, int));
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/*
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* Compute (x / 4) * 3 and (x / 4) * 4. These are used in turning
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* RGB indices (which are in multiples of three) into `chip RGB' values
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* (which are in multiples of four).
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*/
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#define BT_D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2)) /* (x / 4) * 3 */
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#define BT_D4M4(x) ((x) & ~3) /* (x / 4) * 4 */
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