758 lines
18 KiB
C
758 lines
18 KiB
C
/* $XFree86: xc/programs/Xserver/cfb/cfbline.c,v 3.5 2001/10/28 03:33:01 tsi Exp $ */
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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: cfbline.c,v 1.4 2001/02/09 02:04:38 xorgcvs Exp $ */
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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 "gcstruct.h"
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#include "windowstr.h"
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#include "pixmapstr.h"
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#include "regionstr.h"
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#include "scrnintstr.h"
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#include "mistruct.h"
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#include "cfb.h"
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#include "cfbmskbits.h"
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#include "miline.h"
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/* single-pixel lines on a color frame buffer
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NON-SLOPED LINES
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horizontal lines are always drawn left to right; we have to
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move the endpoints right by one after they're swapped.
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horizontal lines will be confined to a single band of a
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region. the code finds that band (giving up if the lower
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bound of the band is above the line we're drawing); then it
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finds the first box in that band that contains part of the
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line. we clip the line to subsequent boxes in that band.
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vertical lines are always drawn top to bottom (y-increasing.)
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this requires adding one to the y-coordinate of each endpoint
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after swapping.
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SLOPED LINES
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when clipping a sloped line, we bring the second point inside
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the clipping box, rather than one beyond it, and then add 1 to
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the length of the line before drawing it. this lets us use
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the same box for finding the outcodes for both endpoints. since
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the equation for clipping the second endpoint to an edge gives us
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1 beyond the edge, we then have to move the point towards the
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first point by one step on the major axis.
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eventually, there will be a diagram here to explain what's going
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on. the method uses Cohen-Sutherland outcodes to determine
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outsideness, and a method similar to Pike's layers for doing the
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actual clipping.
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*/
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void
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#ifdef POLYSEGMENT
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cfbSegmentSS (pDrawable, pGC, nseg, pSeg)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int nseg;
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register xSegment *pSeg;
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#else
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cfbLineSS (pDrawable, pGC, mode, npt, pptInit)
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DrawablePtr pDrawable;
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GCPtr pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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DDXPointPtr pptInit;
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#endif
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{
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int nboxInit;
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register int nbox;
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BoxPtr pboxInit;
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register BoxPtr pbox;
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#ifndef POLYSEGMENT
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register DDXPointPtr ppt; /* pointer to list of translated points */
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#endif
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unsigned int oc1; /* outcode of point 1 */
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unsigned int oc2; /* outcode of point 2 */
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CfbBits *addrl; /* address of destination pixmap */
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int nlwidth; /* width in longwords of destination pixmap */
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int xorg, yorg; /* origin of window */
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int adx; /* abs values of dx and dy */
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int ady;
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int signdx; /* sign of dx and dy */
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int signdy;
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int e, e1, e2; /* bresenham error and increments */
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int len; /* length of segment */
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int axis; /* major axis */
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int octant;
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unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
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/* a bunch of temporaries */
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int tmp;
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register int y1, y2;
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register int x1, x2;
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RegionPtr cclip;
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cfbPrivGCPtr devPriv;
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CfbBits xor, and;
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int alu;
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devPriv = cfbGetGCPrivate(pGC);
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cclip = pGC->pCompositeClip;
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pboxInit = REGION_RECTS(cclip);
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nboxInit = REGION_NUM_RECTS(cclip);
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cfbGetLongWidthAndPointer (pDrawable, nlwidth, addrl)
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alu = devPriv->rop;
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xor = devPriv->xor;
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and = devPriv->and;
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xorg = pDrawable->x;
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yorg = pDrawable->y;
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#ifdef POLYSEGMENT
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while (nseg--)
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#else
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ppt = pptInit;
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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while(--npt)
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#endif
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{
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nbox = nboxInit;
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pbox = pboxInit;
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#ifdef POLYSEGMENT
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x1 = pSeg->x1 + xorg;
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y1 = pSeg->y1 + yorg;
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x2 = pSeg->x2 + xorg;
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y2 = pSeg->y2 + yorg;
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pSeg++;
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#else
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x1 = x2;
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y1 = y2;
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++ppt;
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if (mode == CoordModePrevious)
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{
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xorg = x1;
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yorg = y1;
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}
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x2 = ppt->x + xorg;
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y2 = ppt->y + yorg;
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#endif
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if (x1 == x2) /* vertical line */
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{
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/* make the line go top to bottom of screen, keeping
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endpoint semantics
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*/
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if (y1 > y2)
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{
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register int tmp;
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tmp = y2;
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y2 = y1 + 1;
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y1 = tmp + 1;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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y1--;
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#endif
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}
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#ifdef POLYSEGMENT
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else if (pGC->capStyle != CapNotLast)
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y2++;
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#endif
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/* get to first band that might contain part of line */
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while ((nbox) && (pbox->y2 <= y1))
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{
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pbox++;
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nbox--;
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}
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if (nbox)
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{
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/* stop when lower edge of box is beyond end of line */
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while((nbox) && (y2 >= pbox->y1))
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{
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if ((x1 >= pbox->x1) && (x1 < pbox->x2))
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{
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int y1t, y2t;
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/* this box has part of the line in it */
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y1t = max(y1, pbox->y1);
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y2t = min(y2, pbox->y2);
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if (y1t != y2t)
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{
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cfbVertS (alu, and, xor,
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addrl, nlwidth,
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x1, y1t, y2t-y1t);
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}
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}
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nbox--;
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pbox++;
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}
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}
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#ifndef POLYSEGMENT
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y2 = ppt->y + yorg;
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#endif
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}
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else if (y1 == y2) /* horizontal line */
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{
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/* force line from left to right, keeping
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endpoint semantics
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*/
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if (x1 > x2)
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{
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register int tmp;
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tmp = x2;
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x2 = x1 + 1;
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x1 = tmp + 1;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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x1--;
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#endif
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}
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#ifdef POLYSEGMENT
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else if (pGC->capStyle != CapNotLast)
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x2++;
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#endif
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/* find the correct band */
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while( (nbox) && (pbox->y2 <= y1))
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{
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pbox++;
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nbox--;
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}
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/* try to draw the line, if we haven't gone beyond it */
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if ((nbox) && (pbox->y1 <= y1))
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{
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/* when we leave this band, we're done */
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tmp = pbox->y1;
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while((nbox) && (pbox->y1 == tmp))
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{
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int x1t, x2t;
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if (pbox->x2 <= x1)
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{
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/* skip boxes until one might contain start point */
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nbox--;
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pbox++;
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continue;
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}
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/* stop if left of box is beyond right of line */
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if (pbox->x1 >= x2)
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{
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nbox = 0;
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break;
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}
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x1t = max(x1, pbox->x1);
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x2t = min(x2, pbox->x2);
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if (x1t != x2t)
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{
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cfbHorzS (alu, and, xor,
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addrl, nlwidth,
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x1t, y1, x2t-x1t);
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}
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nbox--;
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pbox++;
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}
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}
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#ifndef POLYSEGMENT
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x2 = ppt->x + xorg;
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#endif
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}
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else /* sloped line */
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{
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CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy,
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1, 1, octant);
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if (adx > ady)
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{
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axis = X_AXIS;
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e1 = ady << 1;
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e2 = e1 - (adx << 1);
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e = e1 - adx;
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}
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else
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{
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axis = Y_AXIS;
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e1 = adx << 1;
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e2 = e1 - (ady << 1);
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e = e1 - ady;
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SetYMajorOctant(octant);
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}
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FIXUP_ERROR(e, octant, bias);
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/* we have bresenham parameters and two points.
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all we have to do now is clip and draw.
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*/
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while(nbox--)
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{
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oc1 = 0;
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oc2 = 0;
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OUTCODES(oc1, x1, y1, pbox);
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OUTCODES(oc2, x2, y2, pbox);
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if ((oc1 | oc2) == 0)
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{
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if (axis == X_AXIS)
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len = adx;
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else
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len = ady;
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#ifdef POLYSEGMENT
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if (pGC->capStyle != CapNotLast)
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len++;
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#endif
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cfbBresS (alu, and, xor,
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addrl, nlwidth,
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signdx, signdy, axis, x1, y1,
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e, e1, e2, len);
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break;
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}
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else if (oc1 & oc2)
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{
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pbox++;
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}
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else
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{
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int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2;
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int clip1 = 0, clip2 = 0;
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int clipdx, clipdy;
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int err;
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if (miZeroClipLine(pbox->x1, pbox->y1, pbox->x2-1,
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pbox->y2-1,
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&new_x1, &new_y1, &new_x2, &new_y2,
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adx, ady, &clip1, &clip2,
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octant, bias, oc1, oc2) == -1)
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{
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pbox++;
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continue;
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}
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if (axis == X_AXIS)
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len = abs(new_x2 - new_x1);
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else
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len = abs(new_y2 - new_y1);
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#ifdef POLYSEGMENT
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if (clip2 != 0 || pGC->capStyle != CapNotLast)
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len++;
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#else
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len += (clip2 != 0);
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#endif
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if (len)
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{
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/* unwind bresenham error term to first point */
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if (clip1)
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{
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clipdx = abs(new_x1 - x1);
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clipdy = abs(new_y1 - y1);
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if (axis == X_AXIS)
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err = e+((clipdy*e2) + ((clipdx-clipdy)*e1));
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else
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err = e+((clipdx*e2) + ((clipdy-clipdx)*e1));
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}
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else
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err = e;
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cfbBresS(alu, and, xor,
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addrl, nlwidth,
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signdx, signdy, axis, new_x1, new_y1,
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err, e1, e2, len);
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}
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pbox++;
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}
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} /* while (nbox--) */
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} /* sloped line */
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} /* while (nline--) */
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#ifndef POLYSEGMENT
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/* paint the last point if the end style isn't CapNotLast.
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(Assume that a projecting, butt, or round cap that is one
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pixel wide is the same as the single pixel of the endpoint.)
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*/
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if ((pGC->capStyle != CapNotLast) &&
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((ppt->x + xorg != pptInit->x + pDrawable->x) ||
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(ppt->y + yorg != pptInit->y + pDrawable->y) ||
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(ppt == pptInit + 1)))
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{
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nbox = nboxInit;
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pbox = pboxInit;
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while (nbox--)
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{
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if ((x2 >= pbox->x1) &&
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(y2 >= pbox->y1) &&
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(x2 < pbox->x2) &&
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(y2 < pbox->y2))
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{
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CfbBits mask;
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CfbBits scrbits;
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#if PSZ == 24
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mask = cfbmask[(x2 & 3)<<1];
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addrl += (y2 * nlwidth) + ((x2*3) >> 2);
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#else
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mask = cfbmask[x2 & PIM];
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addrl += (y2 * nlwidth) + (x2 >> PWSH);
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#endif
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scrbits = *addrl;
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*addrl = (scrbits & ~mask) |
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(DoRRop (scrbits, and, xor) & mask);
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break;
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}
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else
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pbox++;
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}
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}
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#endif
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}
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/*
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* Draw dashed 1-pixel lines.
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*/
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void
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#ifdef POLYSEGMENT
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cfbSegmentSD (pDrawable, pGC, nseg, pSeg)
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DrawablePtr pDrawable;
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register GCPtr pGC;
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int nseg;
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register xSegment *pSeg;
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#else
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cfbLineSD( pDrawable, pGC, mode, npt, pptInit)
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DrawablePtr pDrawable;
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register GCPtr pGC;
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int mode; /* Origin or Previous */
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int npt; /* number of points */
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DDXPointPtr pptInit;
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#endif
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{
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int nboxInit;
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register int nbox;
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BoxPtr pboxInit;
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register BoxPtr pbox;
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#ifndef POLYSEGMENT
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register DDXPointPtr ppt; /* pointer to list of translated points */
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#endif
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register unsigned int oc1; /* outcode of point 1 */
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register unsigned int oc2; /* outcode of point 2 */
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CfbBits *addrl; /* address of destination pixmap */
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int nlwidth; /* width in longwords of destination pixmap */
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int xorg, yorg; /* origin of window */
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int adx; /* abs values of dx and dy */
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int ady;
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int signdx; /* sign of dx and dy */
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int signdy;
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int e, e1, e2; /* bresenham error and increments */
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int len; /* length of segment */
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int axis; /* major axis */
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int octant;
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unsigned int bias = miGetZeroLineBias(pDrawable->pScreen);
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int x1, x2, y1, y2;
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RegionPtr cclip;
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cfbRRopRec rrops[2];
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unsigned char *pDash;
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int dashOffset;
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int numInDashList;
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int dashIndex;
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int isDoubleDash;
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int dashIndexTmp, dashOffsetTmp;
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int unclippedlen;
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cfbPrivGCPtr devPriv;
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devPriv = cfbGetGCPrivate(pGC);
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cclip = pGC->pCompositeClip;
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rrops[0].rop = devPriv->rop;
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rrops[0].and = devPriv->and;
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rrops[0].xor = devPriv->xor;
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if (pGC->alu == GXcopy)
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{
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rrops[1].rop = GXcopy;
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rrops[1].and = 0;
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rrops[1].xor = PFILL (pGC->bgPixel);
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}
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else
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{
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rrops[1].rop = cfbReduceRasterOp (pGC->alu,
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pGC->bgPixel, pGC->planemask,
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&rrops[1].and, &rrops[1].xor);
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}
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pboxInit = REGION_RECTS(cclip);
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nboxInit = REGION_NUM_RECTS(cclip);
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cfbGetLongWidthAndPointer (pDrawable, nlwidth, addrl)
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/* compute initial dash values */
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pDash = (unsigned char *) pGC->dash;
|
|
numInDashList = pGC->numInDashList;
|
|
isDoubleDash = (pGC->lineStyle == LineDoubleDash);
|
|
dashIndex = 0;
|
|
dashOffset = 0;
|
|
miStepDash ((int)pGC->dashOffset, &dashIndex, pDash,
|
|
numInDashList, &dashOffset);
|
|
|
|
xorg = pDrawable->x;
|
|
yorg = pDrawable->y;
|
|
#ifdef POLYSEGMENT
|
|
while (nseg--)
|
|
#else
|
|
ppt = pptInit;
|
|
x2 = ppt->x + xorg;
|
|
y2 = ppt->y + yorg;
|
|
while(--npt)
|
|
#endif
|
|
{
|
|
nbox = nboxInit;
|
|
pbox = pboxInit;
|
|
|
|
#ifdef POLYSEGMENT
|
|
x1 = pSeg->x1 + xorg;
|
|
y1 = pSeg->y1 + yorg;
|
|
x2 = pSeg->x2 + xorg;
|
|
y2 = pSeg->y2 + yorg;
|
|
pSeg++;
|
|
#else
|
|
x1 = x2;
|
|
y1 = y2;
|
|
++ppt;
|
|
if (mode == CoordModePrevious)
|
|
{
|
|
xorg = x1;
|
|
yorg = y1;
|
|
}
|
|
x2 = ppt->x + xorg;
|
|
y2 = ppt->y + yorg;
|
|
#endif
|
|
|
|
CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant);
|
|
|
|
if (adx > ady)
|
|
{
|
|
axis = X_AXIS;
|
|
e1 = ady << 1;
|
|
e2 = e1 - (adx << 1);
|
|
e = e1 - adx;
|
|
unclippedlen = adx;
|
|
}
|
|
else
|
|
{
|
|
axis = Y_AXIS;
|
|
e1 = adx << 1;
|
|
e2 = e1 - (ady << 1);
|
|
e = e1 - ady;
|
|
unclippedlen = ady;
|
|
SetYMajorOctant(octant);
|
|
}
|
|
|
|
FIXUP_ERROR(e, octant, bias);
|
|
|
|
/* we have bresenham parameters and two points.
|
|
all we have to do now is clip and draw.
|
|
*/
|
|
|
|
while(nbox--)
|
|
{
|
|
oc1 = 0;
|
|
oc2 = 0;
|
|
OUTCODES(oc1, x1, y1, pbox);
|
|
OUTCODES(oc2, x2, y2, pbox);
|
|
if ((oc1 | oc2) == 0)
|
|
{
|
|
#ifdef POLYSEGMENT
|
|
if (pGC->capStyle != CapNotLast)
|
|
unclippedlen++;
|
|
dashIndexTmp = dashIndex;
|
|
dashOffsetTmp = dashOffset;
|
|
cfbBresD (rrops,
|
|
&dashIndexTmp, pDash, numInDashList,
|
|
&dashOffsetTmp, isDoubleDash,
|
|
addrl, nlwidth,
|
|
signdx, signdy, axis, x1, y1,
|
|
e, e1, e2, unclippedlen);
|
|
break;
|
|
#else
|
|
cfbBresD (rrops,
|
|
&dashIndex, pDash, numInDashList,
|
|
&dashOffset, isDoubleDash,
|
|
addrl, nlwidth,
|
|
signdx, signdy, axis, x1, y1,
|
|
e, e1, e2, unclippedlen);
|
|
goto dontStep;
|
|
#endif
|
|
}
|
|
else if (oc1 & oc2)
|
|
{
|
|
pbox++;
|
|
}
|
|
else /* have to clip */
|
|
{
|
|
int new_x1 = x1, new_y1 = y1, new_x2 = x2, new_y2 = y2;
|
|
int clip1 = 0, clip2 = 0;
|
|
int clipdx, clipdy;
|
|
int err;
|
|
|
|
if (miZeroClipLine(pbox->x1, pbox->y1, pbox->x2-1,
|
|
pbox->y2-1,
|
|
&new_x1, &new_y1, &new_x2, &new_y2,
|
|
adx, ady, &clip1, &clip2,
|
|
octant, bias, oc1, oc2) == -1)
|
|
{
|
|
pbox++;
|
|
continue;
|
|
}
|
|
|
|
dashIndexTmp = dashIndex;
|
|
dashOffsetTmp = dashOffset;
|
|
|
|
if (clip1)
|
|
{
|
|
int dlen;
|
|
|
|
if (axis == X_AXIS)
|
|
dlen = abs(new_x1 - x1);
|
|
else
|
|
dlen = abs(new_y1 - y1);
|
|
miStepDash (dlen, &dashIndexTmp, pDash,
|
|
numInDashList, &dashOffsetTmp);
|
|
}
|
|
|
|
if (axis == X_AXIS)
|
|
len = abs(new_x2 - new_x1);
|
|
else
|
|
len = abs(new_y2 - new_y1);
|
|
#ifdef POLYSEGMENT
|
|
if (clip2 != 0 || pGC->capStyle != CapNotLast)
|
|
len++;
|
|
#else
|
|
len += (clip2 != 0);
|
|
#endif
|
|
if (len)
|
|
{
|
|
/* unwind bresenham error term to first point */
|
|
if (clip1)
|
|
{
|
|
clipdx = abs(new_x1 - x1);
|
|
clipdy = abs(new_y1 - y1);
|
|
if (axis == X_AXIS)
|
|
err = e+((clipdy*e2) + ((clipdx-clipdy)*e1));
|
|
else
|
|
err = e+((clipdx*e2) + ((clipdy-clipdx)*e1));
|
|
}
|
|
else
|
|
err = e;
|
|
cfbBresD (rrops,
|
|
&dashIndexTmp, pDash, numInDashList,
|
|
&dashOffsetTmp, isDoubleDash,
|
|
addrl, nlwidth,
|
|
signdx, signdy, axis, new_x1, new_y1,
|
|
err, e1, e2, len);
|
|
}
|
|
pbox++;
|
|
}
|
|
} /* while (nbox--) */
|
|
#ifndef POLYSEGMENT
|
|
/*
|
|
* walk the dash list around to the next line
|
|
*/
|
|
miStepDash (unclippedlen, &dashIndex, pDash,
|
|
numInDashList, &dashOffset);
|
|
dontStep: ;
|
|
#endif
|
|
} /* while (nline--) */
|
|
|
|
#ifndef POLYSEGMENT
|
|
/* paint the last point if the end style isn't CapNotLast.
|
|
(Assume that a projecting, butt, or round cap that is one
|
|
pixel wide is the same as the single pixel of the endpoint.)
|
|
*/
|
|
|
|
if ((pGC->capStyle != CapNotLast) &&
|
|
((dashIndex & 1) == 0 || isDoubleDash) &&
|
|
((ppt->x + xorg != pptInit->x + pDrawable->x) ||
|
|
(ppt->y + yorg != pptInit->y + pDrawable->y) ||
|
|
(ppt == pptInit + 1)))
|
|
{
|
|
nbox = nboxInit;
|
|
pbox = pboxInit;
|
|
while (nbox--)
|
|
{
|
|
if ((x2 >= pbox->x1) &&
|
|
(y2 >= pbox->y1) &&
|
|
(x2 < pbox->x2) &&
|
|
(y2 < pbox->y2))
|
|
{
|
|
CfbBits mask;
|
|
int pix;
|
|
|
|
pix = 0;
|
|
if (dashIndex & 1)
|
|
pix = 1;
|
|
#if PSZ == 24
|
|
mask = cfbmask[(x2 & 3)<<1];
|
|
addrl += (y2 * nlwidth) + ((x2 *3)>> 2);
|
|
#else
|
|
mask = cfbmask[x2 & PIM];
|
|
addrl += (y2 * nlwidth) + (x2 >> PWSH);
|
|
#endif
|
|
*addrl = DoMaskRRop (*addrl, rrops[pix].and, rrops[pix].xor, mask);
|
|
break;
|
|
}
|
|
else
|
|
pbox++;
|
|
}
|
|
}
|
|
#endif
|
|
}
|