234 lines
5.5 KiB
C
234 lines
5.5 KiB
C
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/***********************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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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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OPEN GROUP 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 Open Group 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 Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/* $Xorg: cfbbres.c,v 1.4 2001/02/09 02:04:37 xorgcvs Exp $ */
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#include "X.h"
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#include "misc.h"
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#include "cfb.h"
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#include "cfbmskbits.h"
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#include "servermd.h"
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#include "miline.h"
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/* Solid bresenham line */
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/* NOTES
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e2 is used less often than e1, so it's not in a register
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*/
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void
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cfbBresS(rop, and, xor, addrl, nlwidth, signdx, signdy, axis, x1, y1, e, e1,
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e2, len)
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int rop;
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unsigned long and, xor;
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unsigned long *addrl; /* pointer to base of bitmap */
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int nlwidth; /* width in longwords of bitmap */
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register int signdx;
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int signdy; /* signs of directions */
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int axis; /* major axis (Y_AXIS or X_AXIS) */
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int x1, y1; /* initial point */
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register int e; /* error accumulator */
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register int e1; /* bresenham increments */
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int e2;
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int len; /* length of line */
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{
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register int e3 = e2-e1;
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#ifdef PIXEL_ADDR
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register PixelType *addrp; /* Pixel pointer */
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if (len == 0)
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return;
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/* point to first point */
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nlwidth <<= PWSH;
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addrp = (PixelType *)(addrl) + (y1 * nlwidth) + x1;
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if (signdy < 0)
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nlwidth = -nlwidth;
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e = e-e1; /* to make looping easier */
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if (axis == Y_AXIS)
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{
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int t;
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t = nlwidth;
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nlwidth = signdx;
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signdx = t;
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}
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if (rop == GXcopy)
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{
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--len;
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#define body {\
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*addrp = xor; \
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addrp += signdx; \
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e += e1; \
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if (e >= 0) \
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{ \
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addrp += nlwidth; \
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e += e3; \
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} \
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}
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while (len >= 4)
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{
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body body body body
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len -= 4;
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}
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switch (len)
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{
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case 3: body case 2: body case 1: body
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}
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#undef body
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*addrp = xor;
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}
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else /* not GXcopy */
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{
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while(len--)
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{
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*addrp = DoRRop (*addrp, and, xor);
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e += e1;
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if (e >= 0)
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{
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addrp += nlwidth;
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e += e3;
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}
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addrp += signdx;
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}
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}
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#else /* !PIXEL_ADDR */
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register unsigned long tmp, bit;
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unsigned long leftbit, rightbit;
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/* point to longword containing first point */
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addrl = (addrl + (y1 * nlwidth) + (x1 >> PWSH));
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if (signdy < 0)
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nlwidth = -nlwidth;
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e = e-e1; /* to make looping easier */
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leftbit = cfbmask[0];
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rightbit = cfbmask[PPW-1];
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bit = cfbmask[x1 & PIM];
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if (axis == X_AXIS)
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{
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if (signdx > 0)
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{
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while (len--)
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{
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*addrl = DoMaskRRop (*addrl, and, xor, bit);
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bit = SCRRIGHT(bit,1);
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e += e1;
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if (e >= 0)
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{
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addrl += nlwidth;
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e += e3;
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}
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if (!bit)
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{
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bit = leftbit;
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addrl++;
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}
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}
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}
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else
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{
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while (len--)
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{
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*addrl = DoMaskRRop (*addrl, and, xor, bit);
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e += e1;
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bit = SCRLEFT(bit,1);
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if (e >= 0)
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{
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addrl += nlwidth;
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e += e3;
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}
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if (!bit)
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{
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bit = rightbit;
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addrl--;
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}
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}
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}
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} /* if X_AXIS */
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else
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{
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if (signdx > 0)
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{
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while(len--)
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{
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*addrl = DoMaskRRop (*addrl, and, xor, bit);
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e += e1;
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if (e >= 0)
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{
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bit = SCRRIGHT(bit,1);
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if (!bit)
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{
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bit = leftbit;
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addrl++;
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}
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e += e3;
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}
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addrl += nlwidth;
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}
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}
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else
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{
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while(len--)
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{
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*addrl = DoMaskRRop (*addrl, and, xor, bit);
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e += e1;
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if (e >= 0)
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{
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bit = SCRLEFT(bit,1);
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if (!bit)
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{
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bit = rightbit;
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addrl--;
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}
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e += e3;
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}
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addrl += nlwidth;
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}
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}
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} /* else Y_AXIS */
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#endif
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}
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