diff options
Diffstat (limited to 'xorg-server/mi/mipolyutil.c')
| -rw-r--r-- | xorg-server/mi/mipolyutil.c | 754 |
1 files changed, 369 insertions, 385 deletions
diff --git a/xorg-server/mi/mipolyutil.c b/xorg-server/mi/mipolyutil.c index e17fb52e4..5e6301d43 100644 --- a/xorg-server/mi/mipolyutil.c +++ b/xorg-server/mi/mipolyutil.c @@ -1,385 +1,369 @@ -/***********************************************************
-
-Copyright 1987, 1998 The Open Group
-
-Permission to use, copy, modify, distribute, and sell this software and its
-documentation for any purpose is hereby granted without fee, provided that
-the above copyright notice appear in all copies and that both that
-copyright notice and this permission notice appear in supporting
-documentation.
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
-AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-Except as contained in this notice, the name of The Open Group shall not be
-used in advertising or otherwise to promote the sale, use or other dealings
-in this Software without prior written authorization from The Open Group.
-
-
-Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
-
- All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and its
-documentation for any purpose and without fee is hereby granted,
-provided that the above copyright notice appear in all copies and that
-both that copyright notice and this permission notice appear in
-supporting documentation, and that the name of Digital not be
-used in advertising or publicity pertaining to distribution of the
-software without specific, written prior permission.
-
-DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
-ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
-DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
-ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
-ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
-SOFTWARE.
-
-******************************************************************/
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include "regionstr.h"
-#include "gc.h"
-#include "miscanfill.h"
-#include "mipoly.h"
-#include "misc.h" /* MAXINT */
-
-/*
- * fillUtils.c
- *
- * Written by Brian Kelleher; Oct. 1985
- *
- * This module contains all of the utility functions
- * needed to scan convert a polygon.
- *
- */
-
-/*
- * InsertEdgeInET
- *
- * Insert the given edge into the edge table.
- * First we must find the correct bucket in the
- * Edge table, then find the right slot in the
- * bucket. Finally, we can insert it.
- *
- */
-static Bool
-miInsertEdgeInET(EdgeTable *ET, EdgeTableEntry *ETE, int scanline,
- ScanLineListBlock **SLLBlock, int *iSLLBlock)
-{
- EdgeTableEntry *start, *prev;
- ScanLineList *pSLL, *pPrevSLL;
- ScanLineListBlock *tmpSLLBlock;
-
- /*
- * find the right bucket to put the edge into
- */
- pPrevSLL = &ET->scanlines;
- pSLL = pPrevSLL->next;
- while (pSLL && (pSLL->scanline < scanline))
- {
- pPrevSLL = pSLL;
- pSLL = pSLL->next;
- }
-
- /*
- * reassign pSLL (pointer to ScanLineList) if necessary
- */
- if ((!pSLL) || (pSLL->scanline > scanline))
- {
- if (*iSLLBlock > SLLSPERBLOCK-1)
- {
- tmpSLLBlock = malloc(sizeof(ScanLineListBlock));
- if (!tmpSLLBlock)
- return FALSE;
- (*SLLBlock)->next = tmpSLLBlock;
- tmpSLLBlock->next = NULL;
- *SLLBlock = tmpSLLBlock;
- *iSLLBlock = 0;
- }
- pSLL = &((*SLLBlock)->SLLs[(*iSLLBlock)++]);
-
- pSLL->next = pPrevSLL->next;
- pSLL->edgelist = NULL;
- pPrevSLL->next = pSLL;
- }
- pSLL->scanline = scanline;
-
- /*
- * now insert the edge in the right bucket
- */
- prev = NULL;
- start = pSLL->edgelist;
- while (start && (start->bres.minor < ETE->bres.minor))
- {
- prev = start;
- start = start->next;
- }
- ETE->next = start;
-
- if (prev)
- prev->next = ETE;
- else
- pSLL->edgelist = ETE;
- return TRUE;
-}
-
-/*
- * CreateEdgeTable
- *
- * This routine creates the edge table for
- * scan converting polygons.
- * The Edge Table (ET) looks like:
- *
- * EdgeTable
- * --------
- * | ymax | ScanLineLists
- * |scanline|-->------------>-------------->...
- * -------- |scanline| |scanline|
- * |edgelist| |edgelist|
- * --------- ---------
- * | |
- * | |
- * V V
- * list of ETEs list of ETEs
- *
- * where ETE is an EdgeTableEntry data structure,
- * and there is one ScanLineList per scanline at
- * which an edge is initially entered.
- *
- */
-
-Bool
-miCreateETandAET(int count, DDXPointPtr pts, EdgeTable *ET, EdgeTableEntry *AET,
- EdgeTableEntry *pETEs, ScanLineListBlock *pSLLBlock)
-{
- DDXPointPtr top, bottom;
- DDXPointPtr PrevPt, CurrPt;
- int iSLLBlock = 0;
-
- int dy;
-
- if (count < 2) return TRUE;
-
- /*
- * initialize the Active Edge Table
- */
- AET->next = NULL;
- AET->back = NULL;
- AET->nextWETE = NULL;
- AET->bres.minor = MININT;
-
- /*
- * initialize the Edge Table.
- */
- ET->scanlines.next = NULL;
- ET->ymax = MININT;
- ET->ymin = MAXINT;
- pSLLBlock->next = NULL;
-
- PrevPt = &pts[count-1];
-
- /*
- * for each vertex in the array of points.
- * In this loop we are dealing with two vertices at
- * a time -- these make up one edge of the polygon.
- */
- while (count--)
- {
- CurrPt = pts++;
-
- /*
- * find out which point is above and which is below.
- */
- if (PrevPt->y > CurrPt->y)
- {
- bottom = PrevPt, top = CurrPt;
- pETEs->ClockWise = 0;
- }
- else
- {
- bottom = CurrPt, top = PrevPt;
- pETEs->ClockWise = 1;
- }
-
- /*
- * don't add horizontal edges to the Edge table.
- */
- if (bottom->y != top->y)
- {
- pETEs->ymax = bottom->y-1; /* -1 so we don't get last scanline */
-
- /*
- * initialize integer edge algorithm
- */
- dy = bottom->y - top->y;
- BRESINITPGONSTRUCT(dy, top->x, bottom->x, pETEs->bres);
-
- if (!miInsertEdgeInET(ET, pETEs, top->y, &pSLLBlock, &iSLLBlock))
- {
- miFreeStorage(pSLLBlock->next);
- return FALSE;
- }
-
- ET->ymax = max(ET->ymax, PrevPt->y);
- ET->ymin = min(ET->ymin, PrevPt->y);
- pETEs++;
- }
-
- PrevPt = CurrPt;
- }
- return TRUE;
-}
-
-/*
- * loadAET
- *
- * This routine moves EdgeTableEntries from the
- * EdgeTable into the Active Edge Table,
- * leaving them sorted by smaller x coordinate.
- *
- */
-
-void
-miloadAET(EdgeTableEntry *AET, EdgeTableEntry *ETEs)
-{
- EdgeTableEntry *pPrevAET;
- EdgeTableEntry *tmp;
-
- pPrevAET = AET;
- AET = AET->next;
- while (ETEs)
- {
- while (AET && (AET->bres.minor < ETEs->bres.minor))
- {
- pPrevAET = AET;
- AET = AET->next;
- }
- tmp = ETEs->next;
- ETEs->next = AET;
- if (AET)
- AET->back = ETEs;
- ETEs->back = pPrevAET;
- pPrevAET->next = ETEs;
- pPrevAET = ETEs;
-
- ETEs = tmp;
- }
-}
-
-/*
- * computeWAET
- *
- * This routine links the AET by the
- * nextWETE (winding EdgeTableEntry) link for
- * use by the winding number rule. The final
- * Active Edge Table (AET) might look something
- * like:
- *
- * AET
- * ---------- --------- ---------
- * |ymax | |ymax | |ymax |
- * | ... | |... | |... |
- * |next |->|next |->|next |->...
- * |nextWETE| |nextWETE| |nextWETE|
- * --------- --------- ^--------
- * | | |
- * V-------------------> V---> ...
- *
- */
-void
-micomputeWAET(EdgeTableEntry *AET)
-{
- EdgeTableEntry *pWETE;
- int inside = 1;
- int isInside = 0;
-
- AET->nextWETE = NULL;
- pWETE = AET;
- AET = AET->next;
- while (AET)
- {
- if (AET->ClockWise)
- isInside++;
- else
- isInside--;
-
- if ((!inside && !isInside) ||
- ( inside && isInside))
- {
- pWETE->nextWETE = AET;
- pWETE = AET;
- inside = !inside;
- }
- AET = AET->next;
- }
- pWETE->nextWETE = NULL;
-}
-
-/*
- * InsertionSort
- *
- * Just a simple insertion sort using
- * pointers and back pointers to sort the Active
- * Edge Table.
- *
- */
-
-int
-miInsertionSort(EdgeTableEntry *AET)
-{
- EdgeTableEntry *pETEchase;
- EdgeTableEntry *pETEinsert;
- EdgeTableEntry *pETEchaseBackTMP;
- int changed = 0;
-
- AET = AET->next;
- while (AET)
- {
- pETEinsert = AET;
- pETEchase = AET;
- while (pETEchase->back->bres.minor > AET->bres.minor)
- pETEchase = pETEchase->back;
-
- AET = AET->next;
- if (pETEchase != pETEinsert)
- {
- pETEchaseBackTMP = pETEchase->back;
- pETEinsert->back->next = AET;
- if (AET)
- AET->back = pETEinsert->back;
- pETEinsert->next = pETEchase;
- pETEchase->back->next = pETEinsert;
- pETEchase->back = pETEinsert;
- pETEinsert->back = pETEchaseBackTMP;
- changed = 1;
- }
- }
- return changed;
-}
-
-/*
- * Clean up our act.
- */
-void
-miFreeStorage(ScanLineListBlock *pSLLBlock)
-{
- ScanLineListBlock *tmpSLLBlock;
-
- while (pSLLBlock)
- {
- tmpSLLBlock = pSLLBlock->next;
- free(pSLLBlock);
- pSLLBlock = tmpSLLBlock;
- }
-}
+/*********************************************************** + +Copyright 1987, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + +Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +#ifdef HAVE_DIX_CONFIG_H +#include <dix-config.h> +#endif + +#include "regionstr.h" +#include "gc.h" +#include "miscanfill.h" +#include "mipoly.h" +#include "misc.h" /* MAXINT */ + +/* + * fillUtils.c + * + * Written by Brian Kelleher; Oct. 1985 + * + * This module contains all of the utility functions + * needed to scan convert a polygon. + * + */ + +/* + * InsertEdgeInET + * + * Insert the given edge into the edge table. + * First we must find the correct bucket in the + * Edge table, then find the right slot in the + * bucket. Finally, we can insert it. + * + */ +static Bool +miInsertEdgeInET(EdgeTable * ET, EdgeTableEntry * ETE, int scanline, + ScanLineListBlock ** SLLBlock, int *iSLLBlock) +{ + EdgeTableEntry *start, *prev; + ScanLineList *pSLL, *pPrevSLL; + ScanLineListBlock *tmpSLLBlock; + + /* + * find the right bucket to put the edge into + */ + pPrevSLL = &ET->scanlines; + pSLL = pPrevSLL->next; + while (pSLL && (pSLL->scanline < scanline)) { + pPrevSLL = pSLL; + pSLL = pSLL->next; + } + + /* + * reassign pSLL (pointer to ScanLineList) if necessary + */ + if ((!pSLL) || (pSLL->scanline > scanline)) { + if (*iSLLBlock > SLLSPERBLOCK - 1) { + tmpSLLBlock = malloc(sizeof(ScanLineListBlock)); + if (!tmpSLLBlock) + return FALSE; + (*SLLBlock)->next = tmpSLLBlock; + tmpSLLBlock->next = NULL; + *SLLBlock = tmpSLLBlock; + *iSLLBlock = 0; + } + pSLL = &((*SLLBlock)->SLLs[(*iSLLBlock)++]); + + pSLL->next = pPrevSLL->next; + pSLL->edgelist = NULL; + pPrevSLL->next = pSLL; + } + pSLL->scanline = scanline; + + /* + * now insert the edge in the right bucket + */ + prev = NULL; + start = pSLL->edgelist; + while (start && (start->bres.minor < ETE->bres.minor)) { + prev = start; + start = start->next; + } + ETE->next = start; + + if (prev) + prev->next = ETE; + else + pSLL->edgelist = ETE; + return TRUE; +} + +/* + * CreateEdgeTable + * + * This routine creates the edge table for + * scan converting polygons. + * The Edge Table (ET) looks like: + * + * EdgeTable + * -------- + * | ymax | ScanLineLists + * |scanline|-->------------>-------------->... + * -------- |scanline| |scanline| + * |edgelist| |edgelist| + * --------- --------- + * | | + * | | + * V V + * list of ETEs list of ETEs + * + * where ETE is an EdgeTableEntry data structure, + * and there is one ScanLineList per scanline at + * which an edge is initially entered. + * + */ + +Bool +miCreateETandAET(int count, DDXPointPtr pts, EdgeTable * ET, + EdgeTableEntry * AET, EdgeTableEntry * pETEs, + ScanLineListBlock * pSLLBlock) +{ + DDXPointPtr top, bottom; + DDXPointPtr PrevPt, CurrPt; + int iSLLBlock = 0; + + int dy; + + if (count < 2) + return TRUE; + + /* + * initialize the Active Edge Table + */ + AET->next = NULL; + AET->back = NULL; + AET->nextWETE = NULL; + AET->bres.minor = MININT; + + /* + * initialize the Edge Table. + */ + ET->scanlines.next = NULL; + ET->ymax = MININT; + ET->ymin = MAXINT; + pSLLBlock->next = NULL; + + PrevPt = &pts[count - 1]; + + /* + * for each vertex in the array of points. + * In this loop we are dealing with two vertices at + * a time -- these make up one edge of the polygon. + */ + while (count--) { + CurrPt = pts++; + + /* + * find out which point is above and which is below. + */ + if (PrevPt->y > CurrPt->y) { + bottom = PrevPt, top = CurrPt; + pETEs->ClockWise = 0; + } + else { + bottom = CurrPt, top = PrevPt; + pETEs->ClockWise = 1; + } + + /* + * don't add horizontal edges to the Edge table. + */ + if (bottom->y != top->y) { + pETEs->ymax = bottom->y - 1; /* -1 so we don't get last scanline */ + + /* + * initialize integer edge algorithm + */ + dy = bottom->y - top->y; + BRESINITPGONSTRUCT(dy, top->x, bottom->x, pETEs->bres); + + if (!miInsertEdgeInET(ET, pETEs, top->y, &pSLLBlock, &iSLLBlock)) { + miFreeStorage(pSLLBlock->next); + return FALSE; + } + + ET->ymax = max(ET->ymax, PrevPt->y); + ET->ymin = min(ET->ymin, PrevPt->y); + pETEs++; + } + + PrevPt = CurrPt; + } + return TRUE; +} + +/* + * loadAET + * + * This routine moves EdgeTableEntries from the + * EdgeTable into the Active Edge Table, + * leaving them sorted by smaller x coordinate. + * + */ + +void +miloadAET(EdgeTableEntry * AET, EdgeTableEntry * ETEs) +{ + EdgeTableEntry *pPrevAET; + EdgeTableEntry *tmp; + + pPrevAET = AET; + AET = AET->next; + while (ETEs) { + while (AET && (AET->bres.minor < ETEs->bres.minor)) { + pPrevAET = AET; + AET = AET->next; + } + tmp = ETEs->next; + ETEs->next = AET; + if (AET) + AET->back = ETEs; + ETEs->back = pPrevAET; + pPrevAET->next = ETEs; + pPrevAET = ETEs; + + ETEs = tmp; + } +} + +/* + * computeWAET + * + * This routine links the AET by the + * nextWETE (winding EdgeTableEntry) link for + * use by the winding number rule. The final + * Active Edge Table (AET) might look something + * like: + * + * AET + * ---------- --------- --------- + * |ymax | |ymax | |ymax | + * | ... | |... | |... | + * |next |->|next |->|next |->... + * |nextWETE| |nextWETE| |nextWETE| + * --------- --------- ^-------- + * | | | + * V-------------------> V---> ... + * + */ +void +micomputeWAET(EdgeTableEntry * AET) +{ + EdgeTableEntry *pWETE; + int inside = 1; + int isInside = 0; + + AET->nextWETE = NULL; + pWETE = AET; + AET = AET->next; + while (AET) { + if (AET->ClockWise) + isInside++; + else + isInside--; + + if ((!inside && !isInside) || (inside && isInside)) { + pWETE->nextWETE = AET; + pWETE = AET; + inside = !inside; + } + AET = AET->next; + } + pWETE->nextWETE = NULL; +} + +/* + * InsertionSort + * + * Just a simple insertion sort using + * pointers and back pointers to sort the Active + * Edge Table. + * + */ + +int +miInsertionSort(EdgeTableEntry * AET) +{ + EdgeTableEntry *pETEchase; + EdgeTableEntry *pETEinsert; + EdgeTableEntry *pETEchaseBackTMP; + int changed = 0; + + AET = AET->next; + while (AET) { + pETEinsert = AET; + pETEchase = AET; + while (pETEchase->back->bres.minor > AET->bres.minor) + pETEchase = pETEchase->back; + + AET = AET->next; + if (pETEchase != pETEinsert) { + pETEchaseBackTMP = pETEchase->back; + pETEinsert->back->next = AET; + if (AET) + AET->back = pETEinsert->back; + pETEinsert->next = pETEchase; + pETEchase->back->next = pETEinsert; + pETEchase->back = pETEinsert; + pETEinsert->back = pETEchaseBackTMP; + changed = 1; + } + } + return changed; +} + +/* + * Clean up our act. + */ +void +miFreeStorage(ScanLineListBlock * pSLLBlock) +{ + ScanLineListBlock *tmpSLLBlock; + + while (pSLLBlock) { + tmpSLLBlock = pSLLBlock->next; + free(pSLLBlock); + pSLLBlock = tmpSLLBlock; + } +} |