diff options
Diffstat (limited to 'hw/xfree86/xf4bpp/mfbbres.c')
| -rw-r--r-- | hw/xfree86/xf4bpp/mfbbres.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/hw/xfree86/xf4bpp/mfbbres.c b/hw/xfree86/xf4bpp/mfbbres.c new file mode 100644 index 000000000..300256021 --- /dev/null +++ b/hw/xfree86/xf4bpp/mfbbres.c @@ -0,0 +1,162 @@ +/* $XFree86: xc/programs/Xserver/hw/xfree86/xf4bpp/mfbbres.c,v 1.3 1999/06/06 08:48:54 dawes Exp $ */ +/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */ +/*********************************************************** + +Copyright (c) 1987 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. + + +Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +/* GJA -- modified this file for vga16 */ +/* $XConsortium: mfbbres.c /main/5 1996/02/21 17:56:30 kaleb $ */ + +#include "xf4bpp.h" +#include "OScompiler.h" +#include "mfbmap.h" +#include "mfb.h" +#include "maskbits.h" +#include "miline.h" +#include "wm3.h" + +/* Solid bresenham line */ +/* NOTES + e2 is used less often than e1, so it's not in a register +*/ + +void +xf4bppBresS(addrlbase, nlwidth, signdx, signdy, axis, x1, y1, e, e1, e2, len) +PixelType *addrlbase; /* pointer to base of bitmap */ +int nlwidth; /* width in longwords of bitmap */ +int signdx, signdy; /* signs of directions */ +int axis; /* major axis (Y_AXIS or X_AXIS) */ +int x1, y1; /* initial point */ +register int e; /* error accumulator */ +register int e1; /* bresenham increments */ +int e2; +int len; /* length of line */ +{ + register int yinc; /* increment to next scanline, in bytes */ + register PixelType *addrl; /* bitmask long pointer + *dont* * cast to char pointer */ + register PixelType bit; /* current bit being set/cleared/etc. */ + PixelType leftbit = mask[0]; /* leftmost bit to process in new word */ + PixelType rightbit = mask[PPW-1]; /* rightmost bit to process in new word */ + + register int e3 = e2-e1; + + /* point to longword containing first point */ + addrl = mfbScanline(addrlbase, x1, y1, nlwidth); + yinc = signdy * nlwidth; + e = e-e1; /* to make looping easier */ + bit = mask[x1 & PIM]; + + if (!len) + return; + + if (axis == X_AXIS) + { + if (signdx > 0) + { + while(len--) + { + UPDRW(addrl,bit); + e += e1; + if (e >= 0) + { + addrl += yinc; + e += e3; + } + bit = SCRRIGHT(bit,1); + if (!bit) { bit = leftbit; addrl++; } + } + } + else + { + while(len--) + { + UPDRW(addrl,bit); + e += e1; + if (e >= 0) + { + addrl += yinc; + e += e3; + } + bit = SCRLEFT(bit,1); + if (!bit) { bit = rightbit; addrl--; } + } + } + } /* if X_AXIS */ + else + { + if (signdx > 0) + { + while(len--) + { + UPDRW(addrl,bit); + e += e1; + if (e >= 0) + { + bit = SCRRIGHT(bit,1); + if (!bit) { bit = leftbit; addrl++; } + e += e3; + } + addrl += yinc; + } + } + else + { + while(len--) + { + UPDRW(addrl,bit); + e += e1; + if (e >= 0) + { + bit = SCRLEFT(bit,1); + if (!bit) { bit = rightbit; addrl--; } + e += e3; + } + addrl += yinc; + } + } + } /* else Y_AXIS */ +} |