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Diffstat (limited to 'iplan2p4/iplrrop.c')
| -rw-r--r-- | iplan2p4/iplrrop.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/iplan2p4/iplrrop.c b/iplan2p4/iplrrop.c new file mode 100644 index 000000000..cfc43c130 --- /dev/null +++ b/iplan2p4/iplrrop.c @@ -0,0 +1,215 @@ +/* $XFree86: xc/programs/Xserver/iplan2p4/iplrrop.c,v 3.0 1996/08/18 01:55:03 dawes Exp $ */ +/* + * $XConsortium: iplrrop.c,v 1.8 94/04/17 20:28:59 dpw Exp $ + * +Copyright (c) 1989 X Consortium + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of the X Consortium shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from the X Consortium. + * + * Author: Keith Packard, MIT X Consortium + */ + +/* Modified nov 94 by Martin Schaller (Martin_Schaller@maus.r.de) for use with +interleaved planes */ + +/* ipl reduced rasterop computations */ + +#include "X.h" +#include "Xmd.h" +#include "Xproto.h" +#include "ipl.h" + +#include "iplmskbits.h" + +/* A description: + * + * There are four possible operations on each bit in the destination word, + * + * 1 2 3 4 + * + * 0 0 0 1 1 + * 1 0 1 0 1 + * + * On examination of the reduced rop equation (dst = (dst & and) ^ xor), + * these four fall to reduced rops as follows: + * + * and 0 1 1 0 + * xor 0 0 1 1 + * + * or, (if 'and' is expensive) (dst = (dst | or) ^ xor) + * + * or 1 0 0 1 + * xor 1 0 1 0 + * + * The trouble with using this later equation is that trivial + * rasterop reduction is more difficult; some common rasterops + * use complicated expressions of xor/and instead of the simple + * ones while other common rasterops are not made any simpler: + * + * GXcopy: *dst = ~xor instead of *dst = xor + * GXand: *dst = *dst & ~or instead of *dst = *dst & and + * GXor: *dst = *dst | or instead of *dst = *dst | xor + * GXxor: *dst = *dst ^ xor instead of *dst = *dst ^ xor + * + * If you're really set on using this second mechanism, the changes + * are pretty simple. + * + * All that remains is to provide a mechanism for computing and/xor values + * based on the raster op and foreground value. + * + * The 16 rops fall as follows, with the associated reduced + * rop and/xor and or/xor values. The values in parenthesis following the + * reduced values gives an equation using the source value for + * the reduced value, and is one of {0, src, ~src, 1} as appropriate. + * + * clear and andReverse copy + * src 0 1 0 1 0 1 0 1 + * dst 0 0 0 0 0 0 0 0 1 0 0 1 + * 1 0 0 1 0 1 1 0 0 1 0 1 + * + * and 0 0 (0) 0 1 (src) 0 1 (src) 0 0 (0) + * xor 0 0 (0) 0 0 (0) 0 1 (src) 0 1 (src) + * + * or 1 1 (1) 1 0 (~src) 1 0 (~src) 1 1 (1) + * xor 1 1 (1) 1 0 (~src) 1 1 (1) 1 0 (~src) + * + * andInverted noop xor or + * src 0 1 0 1 0 1 0 1 + * dst 0 0 0 0 0 0 0 0 1 0 0 1 + * 1 1 0 1 1 1 1 1 0 1 1 1 + * + * and 1 0 (~src) 1 1 (1) 1 1 (1) 1 0 (~src) + * xor 0 0 (0) 0 0 (0) 0 1 (src) 0 1 (src) + * + * or 0 1 (src) 0 0 (0) 0 0 (0) 0 1 (src) + * xor 0 1 (src) 0 0 (0) 0 1 (src) 0 0 (0) + * + * nor equiv invert orReverse + * src 0 1 0 1 0 1 0 1 + * dst 0 1 0 0 1 0 0 1 1 0 1 1 + * 1 0 0 1 0 1 1 0 0 1 0 1 + * + * and 1 0 (~src) 1 1 (1) 1 1 (1) 1 0 (~src) + * xor 1 0 (~src) 1 0 (~src) 1 1 (1) 1 1 (1) + * + * or 0 1 (src) 0 0 (0) 0 0 (0) 0 1 (src) + * xor 1 1 (1) 1 0 (~src) 1 1 (1) 1 0 (~src) + * + * copyInverted orInverted nand set + * src 0 1 0 1 0 1 0 1 + * dst 0 1 0 0 1 0 0 1 1 0 1 1 + * 1 1 0 1 1 1 1 1 0 1 1 1 + * + * and 0 0 (0) 0 1 (src) 0 1 (src) 0 0 (0) + * xor 1 0 (~src) 1 0 (~src) 1 1 (1) 1 1 (1) + * + * or 1 1 (1) 1 0 (~src) 1 0 (~src) 1 1 (1) + * xor 0 1 (src) 0 0 (0) 0 1 (src) 0 0 (0) + */ + +iplReduceRasterOp (rop, fg, pm, and, xor) + int rop; + unsigned long fg, pm; + unsigned short *and; + unsigned short *xor; +{ + int rrop; + switch (rop) + { + case GXclear: + INTER_CLR(and); + INTER_CLR(xor); + break; + case GXand: + INTER_PFILL(fg, and); + INTER_CLR(xor); + break; + case GXandReverse: + INTER_PFILL(fg, and); + INTER_PFILL(fg, xor); + break; + case GXcopy: + INTER_CLR(and); + INTER_PFILL(fg, xor); + break; + case GXandInverted: + INTER_PFILL(~fg, xor); + INTER_CLR(xor); + break; + case GXnoop: + INTER_SET(and); + INTER_CLR(xor); + break; + case GXxor: + INTER_SET(and); + INTER_PFILL(fg, xor); + break; + case GXor: + INTER_PFILL(~fg, and); + INTER_PFILL(fg, xor); + break; + case GXnor: + INTER_PFILL(~fg, and); + INTER_PFILL(~fg, xor); + break; + case GXequiv: + INTER_SET(and); + INTER_PFILL(~fg, xor); + case GXinvert: + INTER_SET(and); + INTER_SET(xor); + break; + case GXorReverse: + INTER_PFILL(~fg, and); + INTER_SET(xor); + break; + case GXcopyInverted: + INTER_CLR(and); + INTER_PFILL(~fg, xor); + break; + case GXorInverted: + INTER_PFILL(fg, and); + INTER_PFILL(~fg, xor); + break; + case GXnand: + INTER_PFILL(fg, and); + INTER_SET(xor); + break; + case GXset: + INTER_CLR(and); + INTER_SET(xor); + break; + } + INTER_ANDXOR_PM(pm, and, xor); + if (INTER_IS_CLR(and)) + rrop = GXcopy; + else if (INTER_IS_SET(and)) + rrop = GXxor; + else if (INTER_IS_CLR(xor)) + rrop = GXand; + else if (INTER_IS_XOR_SET(and, xor)) + rrop = GXor; + else + rrop = GXset; + return rrop; +} + |