229 lines
7.7 KiB
C
229 lines
7.7 KiB
C
/* $XFree86: xc/programs/Xserver/mi/mipolygen.c,v 1.3 2001/12/14 20:00:25 dawes 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: mipolygen.c,v 1.4 2001/02/09 02:05:21 xorgcvs Exp $ */
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#include "X.h"
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#include "gcstruct.h"
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#include "miscanfill.h"
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#include "mipoly.h"
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#include "pixmap.h"
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#include "mi.h"
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/*
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*
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* Written by Brian Kelleher; Oct. 1985
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*
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* Routine to fill a polygon. Two fill rules are
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* supported: frWINDING and frEVENODD.
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*
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* See fillpoly.h for a complete description of the algorithm.
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*/
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Bool
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miFillGeneralPoly(dst, pgc, count, ptsIn)
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DrawablePtr dst;
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GCPtr pgc;
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int count; /* number of points */
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DDXPointPtr ptsIn; /* the points */
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{
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register EdgeTableEntry *pAET; /* the Active Edge Table */
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register int y; /* the current scanline */
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register int nPts = 0; /* number of pts in buffer */
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register EdgeTableEntry *pWETE; /* Winding Edge Table */
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register ScanLineList *pSLL; /* Current ScanLineList */
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register DDXPointPtr ptsOut; /* ptr to output buffers */
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int *width;
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DDXPointRec FirstPoint[NUMPTSTOBUFFER]; /* the output buffers */
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int FirstWidth[NUMPTSTOBUFFER];
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EdgeTableEntry *pPrevAET; /* previous AET entry */
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EdgeTable ET; /* Edge Table header node */
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EdgeTableEntry AET; /* Active ET header node */
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EdgeTableEntry *pETEs; /* Edge Table Entries buff */
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ScanLineListBlock SLLBlock; /* header for ScanLineList */
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int fixWAET = 0;
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if (count < 3)
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return(TRUE);
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if(!(pETEs = (EdgeTableEntry *)
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ALLOCATE_LOCAL(sizeof(EdgeTableEntry) * count)))
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return(FALSE);
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ptsOut = FirstPoint;
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width = FirstWidth;
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if (!miCreateETandAET(count, ptsIn, &ET, &AET, pETEs, &SLLBlock))
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{
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DEALLOCATE_LOCAL(pETEs);
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return(FALSE);
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}
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pSLL = ET.scanlines.next;
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if (pgc->fillRule == EvenOddRule)
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{
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/*
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* for each scanline
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*/
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for (y = ET.ymin; y < ET.ymax; y++)
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{
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/*
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* Add a new edge to the active edge table when we
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* get to the next edge.
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*/
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if (pSLL && y == pSLL->scanline)
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{
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miloadAET(&AET, pSLL->edgelist);
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pSLL = pSLL->next;
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}
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pPrevAET = &AET;
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pAET = AET.next;
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/*
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* for each active edge
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*/
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while (pAET)
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{
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ptsOut->x = pAET->bres.minor;
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ptsOut++->y = y;
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*width++ = pAET->next->bres.minor - pAET->bres.minor;
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nPts++;
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/*
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* send out the buffer when its full
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*/
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if (nPts == NUMPTSTOBUFFER)
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{
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(*pgc->ops->FillSpans)(dst, pgc,
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nPts, FirstPoint, FirstWidth,
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1);
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ptsOut = FirstPoint;
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width = FirstWidth;
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nPts = 0;
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}
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EVALUATEEDGEEVENODD(pAET, pPrevAET, y)
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EVALUATEEDGEEVENODD(pAET, pPrevAET, y);
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}
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miInsertionSort(&AET);
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}
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}
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else /* default to WindingNumber */
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{
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/*
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* for each scanline
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*/
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for (y = ET.ymin; y < ET.ymax; y++)
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{
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/*
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* Add a new edge to the active edge table when we
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* get to the next edge.
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*/
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if (pSLL && y == pSLL->scanline)
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{
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miloadAET(&AET, pSLL->edgelist);
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micomputeWAET(&AET);
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pSLL = pSLL->next;
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}
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pPrevAET = &AET;
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pAET = AET.next;
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pWETE = pAET;
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/*
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* for each active edge
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*/
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while (pAET)
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{
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/*
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* if the next edge in the active edge table is
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* also the next edge in the winding active edge
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* table.
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*/
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if (pWETE == pAET)
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{
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ptsOut->x = pAET->bres.minor;
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ptsOut++->y = y;
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*width++ = pAET->nextWETE->bres.minor - pAET->bres.minor;
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nPts++;
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/*
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* send out the buffer
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*/
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if (nPts == NUMPTSTOBUFFER)
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{
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(*pgc->ops->FillSpans)(dst, pgc, nPts, FirstPoint,
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FirstWidth, 1);
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ptsOut = FirstPoint;
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width = FirstWidth;
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nPts = 0;
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}
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pWETE = pWETE->nextWETE;
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while (pWETE != pAET)
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EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET);
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pWETE = pWETE->nextWETE;
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}
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EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET);
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}
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/*
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* reevaluate the Winding active edge table if we
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* just had to resort it or if we just exited an edge.
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*/
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if (miInsertionSort(&AET) || fixWAET)
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{
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micomputeWAET(&AET);
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fixWAET = 0;
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}
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}
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}
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/*
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* Get any spans that we missed by buffering
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*/
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(*pgc->ops->FillSpans)(dst, pgc, nPts, FirstPoint, FirstWidth, 1);
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DEALLOCATE_LOCAL(pETEs);
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miFreeStorage(SLLBlock.next);
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return(TRUE);
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}
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