220 lines
6.1 KiB
C
220 lines
6.1 KiB
C
/* $XFree86$ */
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/*
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* $XConsortium: iplrrop.c,v 1.8 94/04/17 20:28:59 dpw Exp $
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*
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Copyright (c) 1989 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from the X Consortium.
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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/* Modified nov 94 by Martin Schaller (Martin_Schaller@maus.r.de) for use with
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interleaved planes */
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/* ipl reduced rasterop computations */
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xmd.h>
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#include <X11/Xproto.h>
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#include "ipl.h"
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#include "iplmskbits.h"
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/* A description:
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*
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* There are four possible operations on each bit in the destination word,
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*
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* 1 2 3 4
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*
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* 0 0 0 1 1
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* 1 0 1 0 1
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*
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* On examination of the reduced rop equation (dst = (dst & and) ^ xor),
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* these four fall to reduced rops as follows:
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*
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* and 0 1 1 0
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* xor 0 0 1 1
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*
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* or, (if 'and' is expensive) (dst = (dst | or) ^ xor)
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*
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* or 1 0 0 1
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* xor 1 0 1 0
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*
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* The trouble with using this later equation is that trivial
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* rasterop reduction is more difficult; some common rasterops
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* use complicated expressions of xor/and instead of the simple
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* ones while other common rasterops are not made any simpler:
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*
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* GXcopy: *dst = ~xor instead of *dst = xor
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* GXand: *dst = *dst & ~or instead of *dst = *dst & and
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* GXor: *dst = *dst | or instead of *dst = *dst | xor
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* GXxor: *dst = *dst ^ xor instead of *dst = *dst ^ xor
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*
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* If you're really set on using this second mechanism, the changes
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* are pretty simple.
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*
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* All that remains is to provide a mechanism for computing and/xor values
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* based on the raster op and foreground value.
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*
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* The 16 rops fall as follows, with the associated reduced
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* rop and/xor and or/xor values. The values in parenthesis following the
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* reduced values gives an equation using the source value for
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* the reduced value, and is one of {0, src, ~src, 1} as appropriate.
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*
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* clear and andReverse copy
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* src 0 1 0 1 0 1 0 1
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* dst 0 0 0 0 0 0 0 0 1 0 0 1
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* 1 0 0 1 0 1 1 0 0 1 0 1
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*
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* and 0 0 (0) 0 1 (src) 0 1 (src) 0 0 (0)
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* xor 0 0 (0) 0 0 (0) 0 1 (src) 0 1 (src)
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*
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* or 1 1 (1) 1 0 (~src) 1 0 (~src) 1 1 (1)
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* xor 1 1 (1) 1 0 (~src) 1 1 (1) 1 0 (~src)
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*
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* andInverted noop xor or
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* src 0 1 0 1 0 1 0 1
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* dst 0 0 0 0 0 0 0 0 1 0 0 1
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* 1 1 0 1 1 1 1 1 0 1 1 1
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*
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* and 1 0 (~src) 1 1 (1) 1 1 (1) 1 0 (~src)
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* xor 0 0 (0) 0 0 (0) 0 1 (src) 0 1 (src)
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*
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* or 0 1 (src) 0 0 (0) 0 0 (0) 0 1 (src)
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* xor 0 1 (src) 0 0 (0) 0 1 (src) 0 0 (0)
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*
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* nor equiv invert orReverse
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* src 0 1 0 1 0 1 0 1
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* dst 0 1 0 0 1 0 0 1 1 0 1 1
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* 1 0 0 1 0 1 1 0 0 1 0 1
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*
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* and 1 0 (~src) 1 1 (1) 1 1 (1) 1 0 (~src)
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* xor 1 0 (~src) 1 0 (~src) 1 1 (1) 1 1 (1)
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*
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* or 0 1 (src) 0 0 (0) 0 0 (0) 0 1 (src)
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* xor 1 1 (1) 1 0 (~src) 1 1 (1) 1 0 (~src)
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*
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* copyInverted orInverted nand set
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* src 0 1 0 1 0 1 0 1
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* dst 0 1 0 0 1 0 0 1 1 0 1 1
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* 1 1 0 1 1 1 1 1 0 1 1 1
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*
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* and 0 0 (0) 0 1 (src) 0 1 (src) 0 0 (0)
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* xor 1 0 (~src) 1 0 (~src) 1 1 (1) 1 1 (1)
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*
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* or 1 1 (1) 1 0 (~src) 1 0 (~src) 1 1 (1)
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* xor 0 1 (src) 0 0 (0) 0 1 (src) 0 0 (0)
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*/
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iplReduceRasterOp (rop, fg, pm, and, xor)
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int rop;
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unsigned long fg, pm;
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unsigned short *and;
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unsigned short *xor;
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{
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int rrop;
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switch (rop)
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{
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case GXclear:
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INTER_CLR(and);
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INTER_CLR(xor);
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break;
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case GXand:
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INTER_PFILL(fg, and);
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INTER_CLR(xor);
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break;
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case GXandReverse:
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INTER_PFILL(fg, and);
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INTER_PFILL(fg, xor);
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break;
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case GXcopy:
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INTER_CLR(and);
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INTER_PFILL(fg, xor);
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break;
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case GXandInverted:
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INTER_PFILL(~fg, xor);
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INTER_CLR(xor);
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break;
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case GXnoop:
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INTER_SET(and);
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INTER_CLR(xor);
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break;
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case GXxor:
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INTER_SET(and);
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INTER_PFILL(fg, xor);
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break;
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case GXor:
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INTER_PFILL(~fg, and);
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INTER_PFILL(fg, xor);
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break;
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case GXnor:
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INTER_PFILL(~fg, and);
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INTER_PFILL(~fg, xor);
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break;
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case GXequiv:
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INTER_SET(and);
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INTER_PFILL(~fg, xor);
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case GXinvert:
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INTER_SET(and);
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INTER_SET(xor);
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break;
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case GXorReverse:
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INTER_PFILL(~fg, and);
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INTER_SET(xor);
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break;
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case GXcopyInverted:
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INTER_CLR(and);
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INTER_PFILL(~fg, xor);
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break;
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case GXorInverted:
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INTER_PFILL(fg, and);
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INTER_PFILL(~fg, xor);
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break;
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case GXnand:
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INTER_PFILL(fg, and);
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INTER_SET(xor);
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break;
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case GXset:
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INTER_CLR(and);
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INTER_SET(xor);
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break;
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}
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INTER_ANDXOR_PM(pm, and, xor);
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if (INTER_IS_CLR(and))
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rrop = GXcopy;
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else if (INTER_IS_SET(and))
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rrop = GXxor;
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else if (INTER_IS_CLR(xor))
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rrop = GXand;
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else if (INTER_IS_XOR_SET(and, xor))
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rrop = GXor;
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else
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rrop = GXset;
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return rrop;
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}
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