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2005-03-15 Matthias Clasen <mclasen@redhat.com> Make PLT-reduction work with gcc4, and don't include everything in gdkalias.h: * gdk/gdk.symbols: Group symbols by header and source file. * gdk/makegdkalias.pl: Protect definitions by the same preprocessor symbols used to guard the headers. Move the alias declarations to a separate file which is produced when calling makegdkalias.pl -def * gdk/Makefile.am (gdkaliasdef.c): Add a rule to generate this file. * gdk/*.c, gdk/x11/*.c: Include gdkalias.h after the other headers, include gdkaliasdef.c at the bottom.
624 lines
17 KiB
C
624 lines
17 KiB
C
/* $TOG: PolyReg.c /main/15 1998/02/06 17:47:08 kaleb $ */
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/************************************************************************
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Copyright 1987, 1998 The Open Group
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All Rights Reserved.
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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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/* $XFree86: xc/lib/X11/PolyReg.c,v 1.4 1998/10/03 08:41:21 dawes Exp $ */
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#define LARGE_COORDINATE 1000000
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#define SMALL_COORDINATE -LARGE_COORDINATE
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#include <config.h>
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#include <gdkregion.h>
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#include "gdkregion-generic.h"
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#include "gdkpoly-generic.h"
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#include "gdkalias.h"
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/*
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* InsertEdgeInET
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*
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* Insert the given edge into the edge table.
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* First we must find the correct bucket in the
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* Edge table, then find the right slot in the
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* bucket. Finally, we can insert it.
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*
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*/
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static void
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InsertEdgeInET(ET, ETE, scanline, SLLBlock, iSLLBlock)
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EdgeTable *ET;
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EdgeTableEntry *ETE;
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int scanline;
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ScanLineListBlock **SLLBlock;
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int *iSLLBlock;
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{
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EdgeTableEntry *start, *prev;
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ScanLineList *pSLL, *pPrevSLL;
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ScanLineListBlock *tmpSLLBlock;
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/*
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* find the right bucket to put the edge into
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*/
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pPrevSLL = &ET->scanlines;
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pSLL = pPrevSLL->next;
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while (pSLL && (pSLL->scanline < scanline))
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{
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pPrevSLL = pSLL;
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pSLL = pSLL->next;
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}
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/*
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* reassign pSLL (pointer to ScanLineList) if necessary
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*/
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if ((!pSLL) || (pSLL->scanline > scanline))
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{
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if (*iSLLBlock > SLLSPERBLOCK-1)
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{
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tmpSLLBlock =
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(ScanLineListBlock *)g_malloc(sizeof(ScanLineListBlock));
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(*SLLBlock)->next = tmpSLLBlock;
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tmpSLLBlock->next = (ScanLineListBlock *)NULL;
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*SLLBlock = tmpSLLBlock;
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*iSLLBlock = 0;
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}
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pSLL = &((*SLLBlock)->SLLs[(*iSLLBlock)++]);
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pSLL->next = pPrevSLL->next;
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pSLL->edgelist = (EdgeTableEntry *)NULL;
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pPrevSLL->next = pSLL;
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}
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pSLL->scanline = scanline;
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/*
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* now insert the edge in the right bucket
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*/
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prev = (EdgeTableEntry *)NULL;
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start = pSLL->edgelist;
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while (start && (start->bres.minor_axis < ETE->bres.minor_axis))
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{
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prev = start;
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start = start->next;
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}
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ETE->next = start;
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if (prev)
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prev->next = ETE;
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else
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pSLL->edgelist = ETE;
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}
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/*
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* CreateEdgeTable
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*
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* This routine creates the edge table for
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* scan converting polygons.
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* The Edge Table (ET) looks like:
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*
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* EdgeTable
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* --------
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* | ymax | ScanLineLists
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* |scanline|-->------------>-------------->...
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* -------- |scanline| |scanline|
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* |edgelist| |edgelist|
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* --------- ---------
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* | |
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* | |
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* V V
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* list of ETEs list of ETEs
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*
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* where ETE is an EdgeTableEntry data structure,
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* and there is one ScanLineList per scanline at
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* which an edge is initially entered.
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*
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*/
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static void
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CreateETandAET(count, pts, ET, AET, pETEs, pSLLBlock)
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int count;
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GdkPoint *pts;
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EdgeTable *ET;
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EdgeTableEntry *AET;
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EdgeTableEntry *pETEs;
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ScanLineListBlock *pSLLBlock;
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{
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GdkPoint *top, *bottom;
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GdkPoint *PrevPt, *CurrPt;
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int iSLLBlock = 0;
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int dy;
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if (count < 2) return;
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/*
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* initialize the Active Edge Table
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*/
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AET->next = (EdgeTableEntry *)NULL;
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AET->back = (EdgeTableEntry *)NULL;
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AET->nextWETE = (EdgeTableEntry *)NULL;
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AET->bres.minor_axis = SMALL_COORDINATE;
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/*
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* initialize the Edge Table.
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*/
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ET->scanlines.next = (ScanLineList *)NULL;
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ET->ymax = SMALL_COORDINATE;
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ET->ymin = LARGE_COORDINATE;
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pSLLBlock->next = (ScanLineListBlock *)NULL;
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PrevPt = &pts[count-1];
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/*
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* for each vertex in the array of points.
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* In this loop we are dealing with two vertices at
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* a time -- these make up one edge of the polygon.
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*/
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while (count--)
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{
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CurrPt = pts++;
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/*
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* find out which point is above and which is below.
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*/
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if (PrevPt->y > CurrPt->y)
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{
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bottom = PrevPt, top = CurrPt;
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pETEs->ClockWise = 0;
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}
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else
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{
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bottom = CurrPt, top = PrevPt;
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pETEs->ClockWise = 1;
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}
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/*
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* don't add horizontal edges to the Edge table.
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*/
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if (bottom->y != top->y)
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{
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pETEs->ymax = bottom->y-1; /* -1 so we don't get last scanline */
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/*
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* initialize integer edge algorithm
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*/
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dy = bottom->y - top->y;
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BRESINITPGONSTRUCT(dy, top->x, bottom->x, pETEs->bres);
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InsertEdgeInET(ET, pETEs, top->y, &pSLLBlock, &iSLLBlock);
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if (PrevPt->y > ET->ymax)
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ET->ymax = PrevPt->y;
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if (PrevPt->y < ET->ymin)
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ET->ymin = PrevPt->y;
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pETEs++;
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}
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PrevPt = CurrPt;
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}
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}
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/*
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* loadAET
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*
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* This routine moves EdgeTableEntries from the
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* EdgeTable into the Active Edge Table,
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* leaving them sorted by smaller x coordinate.
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*
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*/
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static void
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loadAET(AET, ETEs)
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EdgeTableEntry *AET, *ETEs;
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{
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EdgeTableEntry *pPrevAET;
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EdgeTableEntry *tmp;
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pPrevAET = AET;
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AET = AET->next;
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while (ETEs)
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{
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while (AET && (AET->bres.minor_axis < ETEs->bres.minor_axis))
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{
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pPrevAET = AET;
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AET = AET->next;
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}
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tmp = ETEs->next;
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ETEs->next = AET;
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if (AET)
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AET->back = ETEs;
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ETEs->back = pPrevAET;
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pPrevAET->next = ETEs;
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pPrevAET = ETEs;
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ETEs = tmp;
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}
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}
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/*
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* computeWAET
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*
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* This routine links the AET by the
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* nextWETE (winding EdgeTableEntry) link for
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* use by the winding number rule. The final
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* Active Edge Table (AET) might look something
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* like:
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*
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* AET
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* ---------- --------- ---------
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* |ymax | |ymax | |ymax |
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* | ... | |... | |... |
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* |next |->|next |->|next |->...
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* |nextWETE| |nextWETE| |nextWETE|
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* --------- --------- ^--------
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* | | |
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* V-------------------> V---> ...
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*
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*/
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static void
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computeWAET(AET)
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EdgeTableEntry *AET;
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{
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EdgeTableEntry *pWETE;
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int inside = 1;
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int isInside = 0;
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AET->nextWETE = (EdgeTableEntry *)NULL;
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pWETE = AET;
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AET = AET->next;
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while (AET)
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{
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if (AET->ClockWise)
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isInside++;
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else
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isInside--;
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if ((!inside && !isInside) ||
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( inside && isInside))
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{
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pWETE->nextWETE = AET;
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pWETE = AET;
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inside = !inside;
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}
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AET = AET->next;
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}
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pWETE->nextWETE = (EdgeTableEntry *)NULL;
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}
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/*
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* InsertionSort
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*
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* Just a simple insertion sort using
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* pointers and back pointers to sort the Active
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* Edge Table.
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*
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*/
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static int
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InsertionSort(AET)
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EdgeTableEntry *AET;
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{
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EdgeTableEntry *pETEchase;
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EdgeTableEntry *pETEinsert;
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EdgeTableEntry *pETEchaseBackTMP;
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int changed = 0;
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AET = AET->next;
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while (AET)
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{
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pETEinsert = AET;
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pETEchase = AET;
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while (pETEchase->back->bres.minor_axis > AET->bres.minor_axis)
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pETEchase = pETEchase->back;
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AET = AET->next;
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if (pETEchase != pETEinsert)
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{
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pETEchaseBackTMP = pETEchase->back;
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pETEinsert->back->next = AET;
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if (AET)
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AET->back = pETEinsert->back;
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pETEinsert->next = pETEchase;
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pETEchase->back->next = pETEinsert;
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pETEchase->back = pETEinsert;
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pETEinsert->back = pETEchaseBackTMP;
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changed = 1;
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}
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}
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return(changed);
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}
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/*
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* Clean up our act.
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*/
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static void
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FreeStorage(pSLLBlock)
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ScanLineListBlock *pSLLBlock;
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{
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ScanLineListBlock *tmpSLLBlock;
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while (pSLLBlock)
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{
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tmpSLLBlock = pSLLBlock->next;
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g_free (pSLLBlock);
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pSLLBlock = tmpSLLBlock;
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}
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}
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/*
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* Create an array of rectangles from a list of points.
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* If indeed these things (POINTS, RECTS) are the same,
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* then this proc is still needed, because it allocates
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* storage for the array, which was allocated on the
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* stack by the calling procedure.
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*
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*/
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static int PtsToRegion(numFullPtBlocks, iCurPtBlock, FirstPtBlock, reg)
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int numFullPtBlocks, iCurPtBlock;
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POINTBLOCK *FirstPtBlock;
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GdkRegion *reg;
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{
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GdkRegionBox *rects;
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GdkPoint *pts;
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POINTBLOCK *CurPtBlock;
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int i;
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GdkRegionBox *extents;
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int numRects;
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extents = ®->extents;
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numRects = ((numFullPtBlocks * NUMPTSTOBUFFER) + iCurPtBlock) >> 1;
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reg->rects = g_renew (GdkRegionBox, reg->rects, numRects);
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reg->size = numRects;
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CurPtBlock = FirstPtBlock;
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rects = reg->rects - 1;
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numRects = 0;
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extents->x1 = G_MAXSHORT, extents->x2 = G_MINSHORT;
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for ( ; numFullPtBlocks >= 0; numFullPtBlocks--) {
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/* the loop uses 2 points per iteration */
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i = NUMPTSTOBUFFER >> 1;
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if (!numFullPtBlocks)
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i = iCurPtBlock >> 1;
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for (pts = CurPtBlock->pts; i--; pts += 2) {
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if (pts->x == pts[1].x)
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continue;
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if (numRects && pts->x == rects->x1 && pts->y == rects->y2 &&
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pts[1].x == rects->x2 &&
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(numRects == 1 || rects[-1].y1 != rects->y1) &&
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(i && pts[2].y > pts[1].y)) {
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rects->y2 = pts[1].y + 1;
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continue;
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}
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numRects++;
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rects++;
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rects->x1 = pts->x; rects->y1 = pts->y;
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rects->x2 = pts[1].x; rects->y2 = pts[1].y + 1;
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if (rects->x1 < extents->x1)
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extents->x1 = rects->x1;
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if (rects->x2 > extents->x2)
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extents->x2 = rects->x2;
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}
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CurPtBlock = CurPtBlock->next;
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}
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if (numRects) {
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extents->y1 = reg->rects->y1;
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extents->y2 = rects->y2;
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} else {
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extents->x1 = 0;
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extents->y1 = 0;
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extents->x2 = 0;
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extents->y2 = 0;
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}
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reg->numRects = numRects;
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return(TRUE);
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}
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/*
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* polytoregion
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*
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* Scan converts a polygon by returning a run-length
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* encoding of the resultant bitmap -- the run-length
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* encoding is in the form of an array of rectangles.
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*/
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GdkRegion *
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gdk_region_polygon(GdkPoint *Pts, gint Count, GdkFillRule rule)
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{
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GdkRegion *region;
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EdgeTableEntry *pAET; /* Active Edge Table */
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int y; /* current scanline */
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int iPts = 0; /* number of pts in buffer */
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EdgeTableEntry *pWETE; /* Winding Edge Table Entry*/
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ScanLineList *pSLL; /* current scanLineList */
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GdkPoint *pts; /* output buffer */
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EdgeTableEntry *pPrevAET; /* ptr to previous AET */
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EdgeTable ET; /* header node for ET */
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EdgeTableEntry AET; /* header node for AET */
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EdgeTableEntry *pETEs; /* EdgeTableEntries pool */
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ScanLineListBlock SLLBlock; /* header for scanlinelist */
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int fixWAET = FALSE;
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POINTBLOCK FirstPtBlock, *curPtBlock; /* PtBlock buffers */
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POINTBLOCK *tmpPtBlock;
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int numFullPtBlocks = 0;
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region = gdk_region_new ();
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/* special case a rectangle */
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pts = Pts;
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if (((Count == 4) ||
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((Count == 5) && (pts[4].x == pts[0].x) && (pts[4].y == pts[0].y))) &&
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(((pts[0].y == pts[1].y) &&
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(pts[1].x == pts[2].x) &&
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(pts[2].y == pts[3].y) &&
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(pts[3].x == pts[0].x)) ||
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((pts[0].x == pts[1].x) &&
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(pts[1].y == pts[2].y) &&
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(pts[2].x == pts[3].x) &&
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(pts[3].y == pts[0].y)))) {
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region->extents.x1 = MIN(pts[0].x, pts[2].x);
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region->extents.y1 = MIN(pts[0].y, pts[2].y);
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region->extents.x2 = MAX(pts[0].x, pts[2].x);
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region->extents.y2 = MAX(pts[0].y, pts[2].y);
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if ((region->extents.x1 != region->extents.x2) &&
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(region->extents.y1 != region->extents.y2)) {
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region->numRects = 1;
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*(region->rects) = region->extents;
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}
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return(region);
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}
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pETEs = g_new (EdgeTableEntry, Count);
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pts = FirstPtBlock.pts;
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CreateETandAET(Count, Pts, &ET, &AET, pETEs, &SLLBlock);
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pSLL = ET.scanlines.next;
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curPtBlock = &FirstPtBlock;
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if (rule == GDK_EVEN_ODD_RULE) {
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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++) {
|
||
/*
|
||
* Add a new edge to the active edge table when we
|
||
* get to the next edge.
|
||
*/
|
||
if (pSLL != NULL && y == pSLL->scanline) {
|
||
loadAET(&AET, pSLL->edgelist);
|
||
pSLL = pSLL->next;
|
||
}
|
||
pPrevAET = &AET;
|
||
pAET = AET.next;
|
||
|
||
/*
|
||
* for each active edge
|
||
*/
|
||
while (pAET) {
|
||
pts->x = pAET->bres.minor_axis, pts->y = y;
|
||
pts++, iPts++;
|
||
|
||
/*
|
||
* send out the buffer
|
||
*/
|
||
if (iPts == NUMPTSTOBUFFER) {
|
||
tmpPtBlock = (POINTBLOCK *)g_malloc(sizeof(POINTBLOCK));
|
||
tmpPtBlock->next = NULL;
|
||
curPtBlock->next = tmpPtBlock;
|
||
curPtBlock = tmpPtBlock;
|
||
pts = curPtBlock->pts;
|
||
numFullPtBlocks++;
|
||
iPts = 0;
|
||
}
|
||
EVALUATEEDGEEVENODD(pAET, pPrevAET, y);
|
||
}
|
||
(void) InsertionSort(&AET);
|
||
}
|
||
}
|
||
else {
|
||
/*
|
||
* for each scanline
|
||
*/
|
||
for (y = ET.ymin; y < ET.ymax; y++) {
|
||
/*
|
||
* Add a new edge to the active edge table when we
|
||
* get to the next edge.
|
||
*/
|
||
if (pSLL != NULL && y == pSLL->scanline) {
|
||
loadAET(&AET, pSLL->edgelist);
|
||
computeWAET(&AET);
|
||
pSLL = pSLL->next;
|
||
}
|
||
pPrevAET = &AET;
|
||
pAET = AET.next;
|
||
pWETE = pAET;
|
||
|
||
/*
|
||
* for each active edge
|
||
*/
|
||
while (pAET) {
|
||
/*
|
||
* add to the buffer only those edges that
|
||
* are in the Winding active edge table.
|
||
*/
|
||
if (pWETE == pAET) {
|
||
pts->x = pAET->bres.minor_axis, pts->y = y;
|
||
pts++, iPts++;
|
||
|
||
/*
|
||
* send out the buffer
|
||
*/
|
||
if (iPts == NUMPTSTOBUFFER) {
|
||
tmpPtBlock = (POINTBLOCK *)g_malloc(sizeof(POINTBLOCK));
|
||
tmpPtBlock->next = NULL;
|
||
curPtBlock->next = tmpPtBlock;
|
||
curPtBlock = tmpPtBlock;
|
||
pts = curPtBlock->pts;
|
||
numFullPtBlocks++; iPts = 0;
|
||
}
|
||
pWETE = pWETE->nextWETE;
|
||
}
|
||
EVALUATEEDGEWINDING(pAET, pPrevAET, y, fixWAET);
|
||
}
|
||
|
||
/*
|
||
* recompute the winding active edge table if
|
||
* we just resorted or have exited an edge.
|
||
*/
|
||
if (InsertionSort(&AET) || fixWAET) {
|
||
computeWAET(&AET);
|
||
fixWAET = FALSE;
|
||
}
|
||
}
|
||
}
|
||
FreeStorage(SLLBlock.next);
|
||
(void) PtsToRegion(numFullPtBlocks, iPts, &FirstPtBlock, region);
|
||
for (curPtBlock = FirstPtBlock.next; --numFullPtBlocks >= 0;) {
|
||
tmpPtBlock = curPtBlock->next;
|
||
g_free (curPtBlock);
|
||
curPtBlock = tmpPtBlock;
|
||
}
|
||
g_free (pETEs);
|
||
return(region);
|
||
}
|
||
|
||
#define __GDK_POLYREG_GENERIC_C__
|
||
#include "gdkaliasdef.c"
|