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Diffstat (limited to 'xorg-server/mi/miregion.c')
| -rw-r--r-- | xorg-server/mi/miregion.c | 1845 |
1 files changed, 0 insertions, 1845 deletions
diff --git a/xorg-server/mi/miregion.c b/xorg-server/mi/miregion.c deleted file mode 100644 index ff58c0372..000000000 --- a/xorg-server/mi/miregion.c +++ /dev/null @@ -1,1845 +0,0 @@ -/***********************************************************
-
-Copyright 1987, 1988, 1989, 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, 1988, 1989 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.
-
-******************************************************************/
-
-/* The panoramix components contained the following notice */
-/*****************************************************************
-
-Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software.
-
-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
-DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
-BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL 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 Digital Equipment Corporation
-shall not be used in advertising or otherwise to promote the sale, use or other
-dealings in this Software without prior written authorization from Digital
-Equipment Corporation.
-
-******************************************************************/
-
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include "regionstr.h"
-#include <X11/Xprotostr.h>
-#include <X11/Xfuncproto.h>
-#include "gc.h"
-#include "mi.h"
-#include "mispans.h"
-#include <pixman.h>
-
-#undef assert
-#ifdef REGION_DEBUG
-#define assert(expr) { \
- CARD32 *foo = NULL; \
- if (!(expr)) { \
- ErrorF("Assertion failed file %s, line %d: %s\n", \
- __FILE__, __LINE__, #expr); \
- *foo = 0xdeadbeef; /* to get a backtrace */ \
- } \
- }
-#else
-#define assert(expr)
-#endif
-
-#define good(reg) assert(miValidRegion(reg))
-
-/*
- * The functions in this file implement the Region abstraction used extensively
- * throughout the X11 sample server. A Region is simply a set of disjoint
- * (non-overlapping) rectangles, plus an "extent" rectangle which is the
- * smallest single rectangle that contains all the non-overlapping rectangles.
- *
- * A Region is implemented as a "y-x-banded" array of rectangles. This array
- * imposes two degrees of order. First, all rectangles are sorted by top side
- * y coordinate first (y1), and then by left side x coordinate (x1).
- *
- * Furthermore, the rectangles are grouped into "bands". Each rectangle in a
- * band has the same top y coordinate (y1), and each has the same bottom y
- * coordinate (y2). Thus all rectangles in a band differ only in their left
- * and right side (x1 and x2). Bands are implicit in the array of rectangles:
- * there is no separate list of band start pointers.
- *
- * The y-x band representation does not minimize rectangles. In particular,
- * if a rectangle vertically crosses a band (the rectangle has scanlines in
- * the y1 to y2 area spanned by the band), then the rectangle may be broken
- * down into two or more smaller rectangles stacked one atop the other.
- *
- * ----------- -----------
- * | | | | band 0
- * | | -------- ----------- --------
- * | | | | in y-x banded | | | | band 1
- * | | | | form is | | | |
- * ----------- | | ----------- --------
- * | | | | band 2
- * -------- --------
- *
- * An added constraint on the rectangles is that they must cover as much
- * horizontal area as possible: no two rectangles within a band are allowed
- * to touch.
- *
- * Whenever possible, bands will be merged together to cover a greater vertical
- * distance (and thus reduce the number of rectangles). Two bands can be merged
- * only if the bottom of one touches the top of the other and they have
- * rectangles in the same places (of the same width, of course).
- *
- * Adam de Boor wrote most of the original region code. Joel McCormack
- * substantially modified or rewrote most of the core arithmetic routines,
- * and added miRegionValidate in order to support several speed improvements
- * to miValidateTree. Bob Scheifler changed the representation to be more
- * compact when empty or a single rectangle, and did a bunch of gratuitous
- * reformatting.
- */
-
-/* true iff two Boxes overlap */
-#define EXTENTCHECK(r1,r2) \
- (!( ((r1)->x2 <= (r2)->x1) || \
- ((r1)->x1 >= (r2)->x2) || \
- ((r1)->y2 <= (r2)->y1) || \
- ((r1)->y1 >= (r2)->y2) ) )
-
-/* true iff (x,y) is in Box */
-#define INBOX(r,x,y) \
- ( ((r)->x2 > x) && \
- ((r)->x1 <= x) && \
- ((r)->y2 > y) && \
- ((r)->y1 <= y) )
-
-/* true iff Box r1 contains Box r2 */
-#define SUBSUMES(r1,r2) \
- ( ((r1)->x1 <= (r2)->x1) && \
- ((r1)->x2 >= (r2)->x2) && \
- ((r1)->y1 <= (r2)->y1) && \
- ((r1)->y2 >= (r2)->y2) )
-
-#define xallocData(n) malloc(REGION_SZOF(n))
-#define xfreeData(reg) if ((reg)->data && (reg)->data->size) free((reg)->data)
-
-#define RECTALLOC_BAIL(pReg,n,bail) \
-if (!(pReg)->data || (((pReg)->data->numRects + (n)) > (pReg)->data->size)) \
- if (!miRectAlloc(pReg, n)) { goto bail; }
-
-#define RECTALLOC(pReg,n) \
-if (!(pReg)->data || (((pReg)->data->numRects + (n)) > (pReg)->data->size)) \
- if (!miRectAlloc(pReg, n)) { return FALSE; }
-
-#define ADDRECT(pNextRect,nx1,ny1,nx2,ny2) \
-{ \
- pNextRect->x1 = nx1; \
- pNextRect->y1 = ny1; \
- pNextRect->x2 = nx2; \
- pNextRect->y2 = ny2; \
- pNextRect++; \
-}
-
-#define NEWRECT(pReg,pNextRect,nx1,ny1,nx2,ny2) \
-{ \
- if (!(pReg)->data || ((pReg)->data->numRects == (pReg)->data->size))\
- { \
- if (!miRectAlloc(pReg, 1)) \
- return FALSE; \
- pNextRect = REGION_TOP(pReg); \
- } \
- ADDRECT(pNextRect,nx1,ny1,nx2,ny2); \
- pReg->data->numRects++; \
- assert(pReg->data->numRects<=pReg->data->size); \
-}
-
-
-#define DOWNSIZE(reg,numRects) \
-if (((numRects) < ((reg)->data->size >> 1)) && ((reg)->data->size > 50)) \
-{ \
- RegDataPtr NewData; \
- NewData = (RegDataPtr)realloc((reg)->data, REGION_SZOF(numRects)); \
- if (NewData) \
- { \
- NewData->size = (numRects); \
- (reg)->data = NewData; \
- } \
-}
-
-
-BoxRec miEmptyBox = {0, 0, 0, 0};
-RegDataRec miEmptyData = {0, 0};
-
-RegDataRec miBrokenData = {0, 0};
-static RegionRec miBrokenRegion = { { 0, 0, 0, 0 }, &miBrokenData };
-
-void
-InitRegions (void)
-{
- pixman_region_set_static_pointers (&miEmptyBox, &miEmptyData, &miBrokenData);
-}
-
-/*****************************************************************
- * RegionCreate(rect, size)
- * This routine does a simple malloc to make a structure of
- * REGION of "size" number of rectangles.
- *****************************************************************/
-
-RegionPtr
-miRegionCreate(BoxPtr rect, int size)
-{
- RegionPtr pReg;
-
- pReg = (RegionPtr)malloc(sizeof(RegionRec));
- if (!pReg)
- return &miBrokenRegion;
-
- miRegionInit (pReg, rect, size);
-
- return(pReg);
-}
-
-void
-miRegionDestroy(RegionPtr pReg)
-{
- pixman_region_fini (pReg);
- if (pReg != &miBrokenRegion)
- free(pReg);
-}
-
-void
-miPrintRegion(RegionPtr rgn)
-{
- int num, size;
- int i;
- BoxPtr rects;
-
- num = REGION_NUM_RECTS(rgn);
- size = REGION_SIZE(rgn);
- rects = REGION_RECTS(rgn);
- ErrorF("[mi] num: %d size: %d\n", num, size);
- ErrorF("[mi] extents: %d %d %d %d\n",
- rgn->extents.x1, rgn->extents.y1, rgn->extents.x2, rgn->extents.y2);
- for (i = 0; i < num; i++)
- ErrorF("[mi] %d %d %d %d \n",
- rects[i].x1, rects[i].y1, rects[i].x2, rects[i].y2);
- ErrorF("[mi] \n");
-}
-
-Bool
-miRegionEqual(RegionPtr reg1, RegionPtr reg2)
-{
- return pixman_region_equal (reg1, reg2);
-}
-
-#ifdef DEBUG
-Bool
-miValidRegion(RegionPtr reg)
-{
- int i, numRects;
-
- if ((reg->extents.x1 > reg->extents.x2) ||
- (reg->extents.y1 > reg->extents.y2))
- return FALSE;
- numRects = REGION_NUM_RECTS(reg);
- if (!numRects)
- return ((reg->extents.x1 == reg->extents.x2) &&
- (reg->extents.y1 == reg->extents.y2) &&
- (reg->data->size || (reg->data == &miEmptyData)));
- else if (numRects == 1)
- return (!reg->data);
- else
- {
- BoxPtr pboxP, pboxN;
- BoxRec box;
-
- pboxP = REGION_RECTS(reg);
- box = *pboxP;
- box.y2 = pboxP[numRects-1].y2;
- pboxN = pboxP + 1;
- for (i = numRects; --i > 0; pboxP++, pboxN++)
- {
- if ((pboxN->x1 >= pboxN->x2) ||
- (pboxN->y1 >= pboxN->y2))
- return FALSE;
- if (pboxN->x1 < box.x1)
- box.x1 = pboxN->x1;
- if (pboxN->x2 > box.x2)
- box.x2 = pboxN->x2;
- if ((pboxN->y1 < pboxP->y1) ||
- ((pboxN->y1 == pboxP->y1) &&
- ((pboxN->x1 < pboxP->x2) || (pboxN->y2 != pboxP->y2))))
- return FALSE;
- }
- return ((box.x1 == reg->extents.x1) &&
- (box.x2 == reg->extents.x2) &&
- (box.y1 == reg->extents.y1) &&
- (box.y2 == reg->extents.y2));
- }
-}
-#endif /* DEBUG */
-
-/*****************************************************************
- * RegionInit(pReg, rect, size)
- * Outer region rect is statically allocated.
- *****************************************************************/
-
-void
-miRegionInit(RegionPtr pReg, BoxPtr rect, int size)
-{
- if (rect)
- pixman_region_init_with_extents (pReg, rect);
- else
- pixman_region_init (pReg);
-}
-
-void
-miRegionUninit(RegionPtr pReg)
-{
- pixman_region_fini (pReg);
-}
-
-Bool
-miRegionBreak (RegionPtr pReg)
-{
- xfreeData (pReg);
- pReg->extents = miEmptyBox;
- pReg->data = &miBrokenData;
- return FALSE;
-}
-
-Bool
-miRectAlloc(RegionPtr pRgn, int n)
-{
- RegDataPtr data;
-
- if (!pRgn->data)
- {
- n++;
- pRgn->data = xallocData(n);
- if (!pRgn->data)
- return miRegionBreak (pRgn);
- pRgn->data->numRects = 1;
- *REGION_BOXPTR(pRgn) = pRgn->extents;
- }
- else if (!pRgn->data->size)
- {
- pRgn->data = xallocData(n);
- if (!pRgn->data)
- return miRegionBreak (pRgn);
- pRgn->data->numRects = 0;
- }
- else
- {
- if (n == 1)
- {
- n = pRgn->data->numRects;
- if (n > 500) /* XXX pick numbers out of a hat */
- n = 250;
- }
- n += pRgn->data->numRects;
- data = (RegDataPtr)realloc(pRgn->data, REGION_SZOF(n));
- if (!data)
- return miRegionBreak (pRgn);
- pRgn->data = data;
- }
- pRgn->data->size = n;
- return TRUE;
-}
-
-Bool
-miRegionCopy(RegionPtr dst, RegionPtr src)
-{
- return pixman_region_copy (dst, src);
-}
-
-/*======================================================================
- * Generic Region Operator
- *====================================================================*/
-
-/*-
- *-----------------------------------------------------------------------
- * miCoalesce --
- * Attempt to merge the boxes in the current band with those in the
- * previous one. We are guaranteed that the current band extends to
- * the end of the rects array. Used only by miRegionOp.
- *
- * Results:
- * The new index for the previous band.
- *
- * Side Effects:
- * If coalescing takes place:
- * - rectangles in the previous band will have their y2 fields
- * altered.
- * - pReg->data->numRects will be decreased.
- *
- *-----------------------------------------------------------------------
- */
-_X_INLINE static int
-miCoalesce (
- RegionPtr pReg, /* Region to coalesce */
- int prevStart, /* Index of start of previous band */
- int curStart) /* Index of start of current band */
-{
- BoxPtr pPrevBox; /* Current box in previous band */
- BoxPtr pCurBox; /* Current box in current band */
- int numRects; /* Number rectangles in both bands */
- int y2; /* Bottom of current band */
- /*
- * Figure out how many rectangles are in the band.
- */
- numRects = curStart - prevStart;
- assert(numRects == pReg->data->numRects - curStart);
-
- if (!numRects) return curStart;
-
- /*
- * The bands may only be coalesced if the bottom of the previous
- * matches the top scanline of the current.
- */
- pPrevBox = REGION_BOX(pReg, prevStart);
- pCurBox = REGION_BOX(pReg, curStart);
- if (pPrevBox->y2 != pCurBox->y1) return curStart;
-
- /*
- * Make sure the bands have boxes in the same places. This
- * assumes that boxes have been added in such a way that they
- * cover the most area possible. I.e. two boxes in a band must
- * have some horizontal space between them.
- */
- y2 = pCurBox->y2;
-
- do {
- if ((pPrevBox->x1 != pCurBox->x1) || (pPrevBox->x2 != pCurBox->x2)) {
- return (curStart);
- }
- pPrevBox++;
- pCurBox++;
- numRects--;
- } while (numRects);
-
- /*
- * The bands may be merged, so set the bottom y of each box
- * in the previous band to the bottom y of the current band.
- */
- numRects = curStart - prevStart;
- pReg->data->numRects -= numRects;
- do {
- pPrevBox--;
- pPrevBox->y2 = y2;
- numRects--;
- } while (numRects);
- return prevStart;
-}
-
-
-/* Quicky macro to avoid trivial reject procedure calls to miCoalesce */
-
-#define Coalesce(newReg, prevBand, curBand) \
- if (curBand - prevBand == newReg->data->numRects - curBand) { \
- prevBand = miCoalesce(newReg, prevBand, curBand); \
- } else { \
- prevBand = curBand; \
- }
-
-/*-
- *-----------------------------------------------------------------------
- * miAppendNonO --
- * Handle a non-overlapping band for the union and subtract operations.
- * Just adds the (top/bottom-clipped) rectangles into the region.
- * Doesn't have to check for subsumption or anything.
- *
- * Results:
- * None.
- *
- * Side Effects:
- * pReg->data->numRects is incremented and the rectangles overwritten
- * with the rectangles we're passed.
- *
- *-----------------------------------------------------------------------
- */
-
-_X_INLINE static Bool
-miAppendNonO (
- RegionPtr pReg,
- BoxPtr r,
- BoxPtr rEnd,
- int y1,
- int y2)
-{
- BoxPtr pNextRect;
- int newRects;
-
- newRects = rEnd - r;
-
- assert(y1 < y2);
- assert(newRects != 0);
-
- /* Make sure we have enough space for all rectangles to be added */
- RECTALLOC(pReg, newRects);
- pNextRect = REGION_TOP(pReg);
- pReg->data->numRects += newRects;
- do {
- assert(r->x1 < r->x2);
- ADDRECT(pNextRect, r->x1, y1, r->x2, y2);
- r++;
- } while (r != rEnd);
-
- return TRUE;
-}
-
-#define FindBand(r, rBandEnd, rEnd, ry1) \
-{ \
- ry1 = r->y1; \
- rBandEnd = r+1; \
- while ((rBandEnd != rEnd) && (rBandEnd->y1 == ry1)) { \
- rBandEnd++; \
- } \
-}
-
-#define AppendRegions(newReg, r, rEnd) \
-{ \
- int newRects; \
- if ((newRects = rEnd - r)) { \
- RECTALLOC(newReg, newRects); \
- memmove((char *)REGION_TOP(newReg),(char *)r, \
- newRects * sizeof(BoxRec)); \
- newReg->data->numRects += newRects; \
- } \
-}
-
-/*-
- *-----------------------------------------------------------------------
- * miRegionOp --
- * Apply an operation to two regions. Called by miUnion, miInverse,
- * miSubtract, miIntersect.... Both regions MUST have at least one
- * rectangle, and cannot be the same object.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * The new region is overwritten.
- * pOverlap set to TRUE if overlapFunc ever returns TRUE.
- *
- * Notes:
- * The idea behind this function is to view the two regions as sets.
- * Together they cover a rectangle of area that this function divides
- * into horizontal bands where points are covered only by one region
- * or by both. For the first case, the nonOverlapFunc is called with
- * each the band and the band's upper and lower extents. For the
- * second, the overlapFunc is called to process the entire band. It
- * is responsible for clipping the rectangles in the band, though
- * this function provides the boundaries.
- * At the end of each band, the new region is coalesced, if possible,
- * to reduce the number of rectangles in the region.
- *
- *-----------------------------------------------------------------------
- */
-
-typedef Bool (*OverlapProcPtr)(
- RegionPtr pReg,
- BoxPtr r1,
- BoxPtr r1End,
- BoxPtr r2,
- BoxPtr r2End,
- short y1,
- short y2,
- Bool *pOverlap);
-
-static Bool
-miRegionOp(
- RegionPtr newReg, /* Place to store result */
- RegionPtr reg1, /* First region in operation */
- RegionPtr reg2, /* 2d region in operation */
- OverlapProcPtr overlapFunc, /* Function to call for over-
- * lapping bands */
- Bool appendNon1, /* Append non-overlapping bands */
- /* in region 1 ? */
- Bool appendNon2, /* Append non-overlapping bands */
- /* in region 2 ? */
- Bool *pOverlap)
-{
- BoxPtr r1; /* Pointer into first region */
- BoxPtr r2; /* Pointer into 2d region */
- BoxPtr r1End; /* End of 1st region */
- BoxPtr r2End; /* End of 2d region */
- short ybot; /* Bottom of intersection */
- short ytop; /* Top of intersection */
- RegDataPtr oldData; /* Old data for newReg */
- int prevBand; /* Index of start of
- * previous band in newReg */
- int curBand; /* Index of start of current
- * band in newReg */
- BoxPtr r1BandEnd; /* End of current band in r1 */
- BoxPtr r2BandEnd; /* End of current band in r2 */
- short top; /* Top of non-overlapping band */
- short bot; /* Bottom of non-overlapping band*/
- int r1y1; /* Temps for r1->y1 and r2->y1 */
- int r2y1;
- int newSize;
- int numRects;
-
- /*
- * Break any region computed from a broken region
- */
- if (REGION_NAR (reg1) || REGION_NAR(reg2))
- return miRegionBreak (newReg);
-
- /*
- * Initialization:
- * set r1, r2, r1End and r2End appropriately, save the rectangles
- * of the destination region until the end in case it's one of
- * the two source regions, then mark the "new" region empty, allocating
- * another array of rectangles for it to use.
- */
-
- r1 = REGION_RECTS(reg1);
- newSize = REGION_NUM_RECTS(reg1);
- r1End = r1 + newSize;
- numRects = REGION_NUM_RECTS(reg2);
- r2 = REGION_RECTS(reg2);
- r2End = r2 + numRects;
- assert(r1 != r1End);
- assert(r2 != r2End);
-
- oldData = NULL;
- if (((newReg == reg1) && (newSize > 1)) ||
- ((newReg == reg2) && (numRects > 1)))
- {
- oldData = newReg->data;
- newReg->data = &miEmptyData;
- }
- /* guess at new size */
- if (numRects > newSize)
- newSize = numRects;
- newSize <<= 1;
- if (!newReg->data)
- newReg->data = &miEmptyData;
- else if (newReg->data->size)
- newReg->data->numRects = 0;
- if (newSize > newReg->data->size)
- if (!miRectAlloc(newReg, newSize))
- return FALSE;
-
- /*
- * Initialize ybot.
- * In the upcoming loop, ybot and ytop serve different functions depending
- * on whether the band being handled is an overlapping or non-overlapping
- * band.
- * In the case of a non-overlapping band (only one of the regions
- * has points in the band), ybot is the bottom of the most recent
- * intersection and thus clips the top of the rectangles in that band.
- * ytop is the top of the next intersection between the two regions and
- * serves to clip the bottom of the rectangles in the current band.
- * For an overlapping band (where the two regions intersect), ytop clips
- * the top of the rectangles of both regions and ybot clips the bottoms.
- */
-
- ybot = min(r1->y1, r2->y1);
-
- /*
- * prevBand serves to mark the start of the previous band so rectangles
- * can be coalesced into larger rectangles. qv. miCoalesce, above.
- * In the beginning, there is no previous band, so prevBand == curBand
- * (curBand is set later on, of course, but the first band will always
- * start at index 0). prevBand and curBand must be indices because of
- * the possible expansion, and resultant moving, of the new region's
- * array of rectangles.
- */
- prevBand = 0;
-
- do {
- /*
- * This algorithm proceeds one source-band (as opposed to a
- * destination band, which is determined by where the two regions
- * intersect) at a time. r1BandEnd and r2BandEnd serve to mark the
- * rectangle after the last one in the current band for their
- * respective regions.
- */
- assert(r1 != r1End);
- assert(r2 != r2End);
-
- FindBand(r1, r1BandEnd, r1End, r1y1);
- FindBand(r2, r2BandEnd, r2End, r2y1);
-
- /*
- * First handle the band that doesn't intersect, if any.
- *
- * Note that attention is restricted to one band in the
- * non-intersecting region at once, so if a region has n
- * bands between the current position and the next place it overlaps
- * the other, this entire loop will be passed through n times.
- */
- if (r1y1 < r2y1) {
- if (appendNon1) {
- top = max(r1y1, ybot);
- bot = min(r1->y2, r2y1);
- if (top != bot) {
- curBand = newReg->data->numRects;
- miAppendNonO(newReg, r1, r1BandEnd, top, bot);
- Coalesce(newReg, prevBand, curBand);
- }
- }
- ytop = r2y1;
- } else if (r2y1 < r1y1) {
- if (appendNon2) {
- top = max(r2y1, ybot);
- bot = min(r2->y2, r1y1);
- if (top != bot) {
- curBand = newReg->data->numRects;
- miAppendNonO(newReg, r2, r2BandEnd, top, bot);
- Coalesce(newReg, prevBand, curBand);
- }
- }
- ytop = r1y1;
- } else {
- ytop = r1y1;
- }
-
- /*
- * Now see if we've hit an intersecting band. The two bands only
- * intersect if ybot > ytop
- */
- ybot = min(r1->y2, r2->y2);
- if (ybot > ytop) {
- curBand = newReg->data->numRects;
- (* overlapFunc)(newReg, r1, r1BandEnd, r2, r2BandEnd, ytop, ybot,
- pOverlap);
- Coalesce(newReg, prevBand, curBand);
- }
-
- /*
- * If we've finished with a band (y2 == ybot) we skip forward
- * in the region to the next band.
- */
- if (r1->y2 == ybot) r1 = r1BandEnd;
- if (r2->y2 == ybot) r2 = r2BandEnd;
-
- } while (r1 != r1End && r2 != r2End);
-
- /*
- * Deal with whichever region (if any) still has rectangles left.
- *
- * We only need to worry about banding and coalescing for the very first
- * band left. After that, we can just group all remaining boxes,
- * regardless of how many bands, into one final append to the list.
- */
-
- if ((r1 != r1End) && appendNon1) {
- /* Do first nonOverlap1Func call, which may be able to coalesce */
- FindBand(r1, r1BandEnd, r1End, r1y1);
- curBand = newReg->data->numRects;
- miAppendNonO(newReg, r1, r1BandEnd, max(r1y1, ybot), r1->y2);
- Coalesce(newReg, prevBand, curBand);
- /* Just append the rest of the boxes */
- AppendRegions(newReg, r1BandEnd, r1End);
-
- } else if ((r2 != r2End) && appendNon2) {
- /* Do first nonOverlap2Func call, which may be able to coalesce */
- FindBand(r2, r2BandEnd, r2End, r2y1);
- curBand = newReg->data->numRects;
- miAppendNonO(newReg, r2, r2BandEnd, max(r2y1, ybot), r2->y2);
- Coalesce(newReg, prevBand, curBand);
- /* Append rest of boxes */
- AppendRegions(newReg, r2BandEnd, r2End);
- }
-
- if (oldData)
- free(oldData);
-
- if (!(numRects = newReg->data->numRects))
- {
- xfreeData(newReg);
- newReg->data = &miEmptyData;
- }
- else if (numRects == 1)
- {
- newReg->extents = *REGION_BOXPTR(newReg);
- xfreeData(newReg);
- newReg->data = NULL;
- }
- else
- {
- DOWNSIZE(newReg, numRects);
- }
-
- return TRUE;
-}
-
-/*-
- *-----------------------------------------------------------------------
- * miSetExtents --
- * Reset the extents of a region to what they should be. Called by
- * miSubtract and miIntersect as they can't figure it out along the
- * way or do so easily, as miUnion can.
- *
- * Results:
- * None.
- *
- * Side Effects:
- * The region's 'extents' structure is overwritten.
- *
- *-----------------------------------------------------------------------
- */
-static void
-miSetExtents (RegionPtr pReg)
-{
- BoxPtr pBox, pBoxEnd;
-
- if (!pReg->data)
- return;
- if (!pReg->data->size)
- {
- pReg->extents.x2 = pReg->extents.x1;
- pReg->extents.y2 = pReg->extents.y1;
- return;
- }
-
- pBox = REGION_BOXPTR(pReg);
- pBoxEnd = REGION_END(pReg);
-
- /*
- * Since pBox is the first rectangle in the region, it must have the
- * smallest y1 and since pBoxEnd is the last rectangle in the region,
- * it must have the largest y2, because of banding. Initialize x1 and
- * x2 from pBox and pBoxEnd, resp., as good things to initialize them
- * to...
- */
- pReg->extents.x1 = pBox->x1;
- pReg->extents.y1 = pBox->y1;
- pReg->extents.x2 = pBoxEnd->x2;
- pReg->extents.y2 = pBoxEnd->y2;
-
- assert(pReg->extents.y1 < pReg->extents.y2);
- while (pBox <= pBoxEnd) {
- if (pBox->x1 < pReg->extents.x1)
- pReg->extents.x1 = pBox->x1;
- if (pBox->x2 > pReg->extents.x2)
- pReg->extents.x2 = pBox->x2;
- pBox++;
- };
-
- assert(pReg->extents.x1 < pReg->extents.x2);
-}
-
-/*======================================================================
- * Region Intersection
- *====================================================================*/
-/*-
- *-----------------------------------------------------------------------
- * miIntersectO --
- * Handle an overlapping band for miIntersect.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * Rectangles may be added to the region.
- *
- *-----------------------------------------------------------------------
- */
-/*ARGSUSED*/
-Bool
-miIntersect(
- RegionPtr newReg, /* destination Region */
- RegionPtr reg1,
- RegionPtr reg2 /* source regions */
- )
-{
- return pixman_region_intersect (newReg, reg1, reg2);
-}
-
-#define MERGERECT(r) \
-{ \
- if (r->x1 <= x2) { \
- /* Merge with current rectangle */ \
- if (r->x1 < x2) *pOverlap = TRUE; \
- if (x2 < r->x2) x2 = r->x2; \
- } else { \
- /* Add current rectangle, start new one */ \
- NEWRECT(pReg, pNextRect, x1, y1, x2, y2); \
- x1 = r->x1; \
- x2 = r->x2; \
- } \
- r++; \
-}
-
-/*======================================================================
- * Region Union
- *====================================================================*/
-
-/*-
- *-----------------------------------------------------------------------
- * miUnionO --
- * Handle an overlapping band for the union operation. Picks the
- * left-most rectangle each time and merges it into the region.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * pReg is overwritten.
- * pOverlap is set to TRUE if any boxes overlap.
- *
- *-----------------------------------------------------------------------
- */
-static Bool
-miUnionO (
- RegionPtr pReg,
- BoxPtr r1,
- BoxPtr r1End,
- BoxPtr r2,
- BoxPtr r2End,
- short y1,
- short y2,
- Bool *pOverlap)
-{
- BoxPtr pNextRect;
- int x1; /* left and right side of current union */
- int x2;
-
- assert (y1 < y2);
- assert(r1 != r1End && r2 != r2End);
-
- pNextRect = REGION_TOP(pReg);
-
- /* Start off current rectangle */
- if (r1->x1 < r2->x1)
- {
- x1 = r1->x1;
- x2 = r1->x2;
- r1++;
- }
- else
- {
- x1 = r2->x1;
- x2 = r2->x2;
- r2++;
- }
- while (r1 != r1End && r2 != r2End)
- {
- if (r1->x1 < r2->x1) MERGERECT(r1) else MERGERECT(r2);
- }
-
- /* Finish off whoever (if any) is left */
- if (r1 != r1End)
- {
- do
- {
- MERGERECT(r1);
- } while (r1 != r1End);
- }
- else if (r2 != r2End)
- {
- do
- {
- MERGERECT(r2);
- } while (r2 != r2End);
- }
-
- /* Add current rectangle */
- NEWRECT(pReg, pNextRect, x1, y1, x2, y2);
-
- return TRUE;
-}
-
-Bool
-miUnion(
- RegionPtr newReg, /* destination Region */
- RegionPtr reg1,
- RegionPtr reg2 /* source regions */
- )
-{
- return pixman_region_union (newReg, reg1, reg2);
-}
-
-/*======================================================================
- * Batch Rectangle Union
- *====================================================================*/
-
-/*-
- *-----------------------------------------------------------------------
- * miRegionAppend --
- *
- * "Append" the rgn rectangles onto the end of dstrgn, maintaining
- * knowledge of YX-banding when it's easy. Otherwise, dstrgn just
- * becomes a non-y-x-banded random collection of rectangles, and not
- * yet a true region. After a sequence of appends, the caller must
- * call miRegionValidate to ensure that a valid region is constructed.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * dstrgn is modified if rgn has rectangles.
- *
- */
-Bool
-miRegionAppend(RegionPtr dstrgn, RegionPtr rgn)
-{
- int numRects, dnumRects, size;
- BoxPtr new, old;
- Bool prepend;
-
- if (REGION_NAR(rgn))
- return miRegionBreak (dstrgn);
-
- if (!rgn->data && (dstrgn->data == &miEmptyData))
- {
- dstrgn->extents = rgn->extents;
- dstrgn->data = NULL;
- return TRUE;
- }
-
- numRects = REGION_NUM_RECTS(rgn);
- if (!numRects)
- return TRUE;
- prepend = FALSE;
- size = numRects;
- dnumRects = REGION_NUM_RECTS(dstrgn);
- if (!dnumRects && (size < 200))
- size = 200; /* XXX pick numbers out of a hat */
- RECTALLOC(dstrgn, size);
- old = REGION_RECTS(rgn);
- if (!dnumRects)
- dstrgn->extents = rgn->extents;
- else if (dstrgn->extents.x2 > dstrgn->extents.x1)
- {
- BoxPtr first, last;
-
- first = old;
- last = REGION_BOXPTR(dstrgn) + (dnumRects - 1);
- if ((first->y1 > last->y2) ||
- ((first->y1 == last->y1) && (first->y2 == last->y2) &&
- (first->x1 > last->x2)))
- {
- if (rgn->extents.x1 < dstrgn->extents.x1)
- dstrgn->extents.x1 = rgn->extents.x1;
- if (rgn->extents.x2 > dstrgn->extents.x2)
- dstrgn->extents.x2 = rgn->extents.x2;
- dstrgn->extents.y2 = rgn->extents.y2;
- }
- else
- {
- first = REGION_BOXPTR(dstrgn);
- last = old + (numRects - 1);
- if ((first->y1 > last->y2) ||
- ((first->y1 == last->y1) && (first->y2 == last->y2) &&
- (first->x1 > last->x2)))
- {
- prepend = TRUE;
- if (rgn->extents.x1 < dstrgn->extents.x1)
- dstrgn->extents.x1 = rgn->extents.x1;
- if (rgn->extents.x2 > dstrgn->extents.x2)
- dstrgn->extents.x2 = rgn->extents.x2;
- dstrgn->extents.y1 = rgn->extents.y1;
- }
- else
- dstrgn->extents.x2 = dstrgn->extents.x1;
- }
- }
- if (prepend)
- {
- new = REGION_BOX(dstrgn, numRects);
- if (dnumRects == 1)
- *new = *REGION_BOXPTR(dstrgn);
- else
- memmove((char *)new,(char *)REGION_BOXPTR(dstrgn),
- dnumRects * sizeof(BoxRec));
- new = REGION_BOXPTR(dstrgn);
- }
- else
- new = REGION_BOXPTR(dstrgn) + dnumRects;
- if (numRects == 1)
- *new = *old;
- else
- memmove((char *)new, (char *)old, numRects * sizeof(BoxRec));
- dstrgn->data->numRects += numRects;
- return TRUE;
-}
-
-
-#define ExchangeRects(a, b) \
-{ \
- BoxRec t; \
- t = rects[a]; \
- rects[a] = rects[b]; \
- rects[b] = t; \
-}
-
-static void
-QuickSortRects(
- BoxRec rects[],
- int numRects)
-{
- int y1;
- int x1;
- int i, j;
- BoxPtr r;
-
- /* Always called with numRects > 1 */
-
- do
- {
- if (numRects == 2)
- {
- if (rects[0].y1 > rects[1].y1 ||
- (rects[0].y1 == rects[1].y1 && rects[0].x1 > rects[1].x1))
- ExchangeRects(0, 1);
- return;
- }
-
- /* Choose partition element, stick in location 0 */
- ExchangeRects(0, numRects >> 1);
- y1 = rects[0].y1;
- x1 = rects[0].x1;
-
- /* Partition array */
- i = 0;
- j = numRects;
- do
- {
- r = &(rects[i]);
- do
- {
- r++;
- i++;
- } while (i != numRects &&
- (r->y1 < y1 || (r->y1 == y1 && r->x1 < x1)));
- r = &(rects[j]);
- do
- {
- r--;
- j--;
- } while (y1 < r->y1 || (y1 == r->y1 && x1 < r->x1));
- if (i < j)
- ExchangeRects(i, j);
- } while (i < j);
-
- /* Move partition element back to middle */
- ExchangeRects(0, j);
-
- /* Recurse */
- if (numRects-j-1 > 1)
- QuickSortRects(&rects[j+1], numRects-j-1);
- numRects = j;
- } while (numRects > 1);
-}
-
-/*-
- *-----------------------------------------------------------------------
- * miRegionValidate --
- *
- * Take a ``region'' which is a non-y-x-banded random collection of
- * rectangles, and compute a nice region which is the union of all the
- * rectangles.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * The passed-in ``region'' may be modified.
- * pOverlap set to TRUE if any retangles overlapped, else FALSE;
- *
- * Strategy:
- * Step 1. Sort the rectangles into ascending order with primary key y1
- * and secondary key x1.
- *
- * Step 2. Split the rectangles into the minimum number of proper y-x
- * banded regions. This may require horizontally merging
- * rectangles, and vertically coalescing bands. With any luck,
- * this step in an identity tranformation (ala the Box widget),
- * or a coalescing into 1 box (ala Menus).
- *
- * Step 3. Merge the separate regions down to a single region by calling
- * miUnion. Maximize the work each miUnion call does by using
- * a binary merge.
- *
- *-----------------------------------------------------------------------
- */
-
-Bool
-miRegionValidate(RegionPtr badreg, Bool *pOverlap)
-{
- /* Descriptor for regions under construction in Step 2. */
- typedef struct {
- RegionRec reg;
- int prevBand;
- int curBand;
- } RegionInfo;
-
- int numRects; /* Original numRects for badreg */
- RegionInfo *ri; /* Array of current regions */
- int numRI; /* Number of entries used in ri */
- int sizeRI; /* Number of entries available in ri */
- int i; /* Index into rects */
- int j; /* Index into ri */
- RegionInfo *rit; /* &ri[j] */
- RegionPtr reg; /* ri[j].reg */
- BoxPtr box; /* Current box in rects */
- BoxPtr riBox; /* Last box in ri[j].reg */
- RegionPtr hreg; /* ri[j_half].reg */
- Bool ret = TRUE;
-
- *pOverlap = FALSE;
- if (!badreg->data)
- {
- good(badreg);
- return TRUE;
- }
- numRects = badreg->data->numRects;
- if (!numRects)
- {
- if (REGION_NAR(badreg))
- return FALSE;
- good(badreg);
- return TRUE;
- }
- if (badreg->extents.x1 < badreg->extents.x2)
- {
- if ((numRects) == 1)
- {
- xfreeData(badreg);
- badreg->data = (RegDataPtr) NULL;
- }
- else
- {
- DOWNSIZE(badreg, numRects);
- }
- good(badreg);
- return TRUE;
- }
-
- /* Step 1: Sort the rects array into ascending (y1, x1) order */
- QuickSortRects(REGION_BOXPTR(badreg), numRects);
-
- /* Step 2: Scatter the sorted array into the minimum number of regions */
-
- /* Set up the first region to be the first rectangle in badreg */
- /* Note that step 2 code will never overflow the ri[0].reg rects array */
- ri = (RegionInfo *) malloc(4 * sizeof(RegionInfo));
- if (!ri)
- return miRegionBreak (badreg);
- sizeRI = 4;
- numRI = 1;
- ri[0].prevBand = 0;
- ri[0].curBand = 0;
- ri[0].reg = *badreg;
- box = REGION_BOXPTR(&ri[0].reg);
- ri[0].reg.extents = *box;
- ri[0].reg.data->numRects = 1;
-
- /* Now scatter rectangles into the minimum set of valid regions. If the
- next rectangle to be added to a region would force an existing rectangle
- in the region to be split up in order to maintain y-x banding, just
- forget it. Try the next region. If it doesn't fit cleanly into any
- region, make a new one. */
-
- for (i = numRects; --i > 0;)
- {
- box++;
- /* Look for a region to append box to */
- for (j = numRI, rit = ri; --j >= 0; rit++)
- {
- reg = &rit->reg;
- riBox = REGION_END(reg);
-
- if (box->y1 == riBox->y1 && box->y2 == riBox->y2)
- {
- /* box is in same band as riBox. Merge or append it */
- if (box->x1 <= riBox->x2)
- {
- /* Merge it with riBox */
- if (box->x1 < riBox->x2) *pOverlap = TRUE;
- if (box->x2 > riBox->x2) riBox->x2 = box->x2;
- }
- else
- {
- RECTALLOC_BAIL(reg, 1, bail);
- *REGION_TOP(reg) = *box;
- reg->data->numRects++;
- }
- goto NextRect; /* So sue me */
- }
- else if (box->y1 >= riBox->y2)
- {
- /* Put box into new band */
- if (reg->extents.x2 < riBox->x2) reg->extents.x2 = riBox->x2;
- if (reg->extents.x1 > box->x1) reg->extents.x1 = box->x1;
- Coalesce(reg, rit->prevBand, rit->curBand);
- rit->curBand = reg->data->numRects;
- RECTALLOC_BAIL(reg, 1, bail);
- *REGION_TOP(reg) = *box;
- reg->data->numRects++;
- goto NextRect;
- }
- /* Well, this region was inappropriate. Try the next one. */
- } /* for j */
-
- /* Uh-oh. No regions were appropriate. Create a new one. */
- if (sizeRI == numRI)
- {
- /* Oops, allocate space for new region information */
- sizeRI <<= 1;
- rit = (RegionInfo *) realloc(ri, sizeRI * sizeof(RegionInfo));
- if (!rit)
- goto bail;
- ri = rit;
- rit = &ri[numRI];
- }
- numRI++;
- rit->prevBand = 0;
- rit->curBand = 0;
- rit->reg.extents = *box;
- rit->reg.data = NULL;
- if (!miRectAlloc(&rit->reg, (i+numRI) / numRI)) /* MUST force allocation */
- goto bail;
-NextRect: ;
- } /* for i */
-
- /* Make a final pass over each region in order to Coalesce and set
- extents.x2 and extents.y2 */
-
- for (j = numRI, rit = ri; --j >= 0; rit++)
- {
- reg = &rit->reg;
- riBox = REGION_END(reg);
- reg->extents.y2 = riBox->y2;
- if (reg->extents.x2 < riBox->x2) reg->extents.x2 = riBox->x2;
- Coalesce(reg, rit->prevBand, rit->curBand);
- if (reg->data->numRects == 1) /* keep unions happy below */
- {
- xfreeData(reg);
- reg->data = NULL;
- }
- }
-
- /* Step 3: Union all regions into a single region */
- while (numRI > 1)
- {
- int half = numRI/2;
- for (j = numRI & 1; j < (half + (numRI & 1)); j++)
- {
- reg = &ri[j].reg;
- hreg = &ri[j+half].reg;
- if (!miRegionOp(reg, reg, hreg, miUnionO, TRUE, TRUE, pOverlap))
- ret = FALSE;
- if (hreg->extents.x1 < reg->extents.x1)
- reg->extents.x1 = hreg->extents.x1;
- if (hreg->extents.y1 < reg->extents.y1)
- reg->extents.y1 = hreg->extents.y1;
- if (hreg->extents.x2 > reg->extents.x2)
- reg->extents.x2 = hreg->extents.x2;
- if (hreg->extents.y2 > reg->extents.y2)
- reg->extents.y2 = hreg->extents.y2;
- xfreeData(hreg);
- }
- numRI -= half;
- }
- *badreg = ri[0].reg;
- free(ri);
- good(badreg);
- return ret;
-bail:
- for (i = 0; i < numRI; i++)
- xfreeData(&ri[i].reg);
- free(ri);
- return miRegionBreak (badreg);
-}
-
-RegionPtr
-miRectsToRegion(int nrects, xRectangle *prect, int ctype)
-{
-
- RegionPtr pRgn;
- RegDataPtr pData;
- BoxPtr pBox;
- int i;
- int x1, y1, x2, y2;
-
- pRgn = miRegionCreate(NullBox, 0);
- if (REGION_NAR (pRgn))
- return pRgn;
- if (!nrects)
- return pRgn;
- if (nrects == 1)
- {
- x1 = prect->x;
- y1 = prect->y;
- if ((x2 = x1 + (int) prect->width) > MAXSHORT)
- x2 = MAXSHORT;
- if ((y2 = y1 + (int) prect->height) > MAXSHORT)
- y2 = MAXSHORT;
- if (x1 != x2 && y1 != y2)
- {
- pRgn->extents.x1 = x1;
- pRgn->extents.y1 = y1;
- pRgn->extents.x2 = x2;
- pRgn->extents.y2 = y2;
- pRgn->data = NULL;
- }
- return pRgn;
- }
- pData = xallocData(nrects);
- if (!pData)
- {
- miRegionBreak (pRgn);
- return pRgn;
- }
- pBox = (BoxPtr) (pData + 1);
- for (i = nrects; --i >= 0; prect++)
- {
- x1 = prect->x;
- y1 = prect->y;
- if ((x2 = x1 + (int) prect->width) > MAXSHORT)
- x2 = MAXSHORT;
- if ((y2 = y1 + (int) prect->height) > MAXSHORT)
- y2 = MAXSHORT;
- if (x1 != x2 && y1 != y2)
- {
- pBox->x1 = x1;
- pBox->y1 = y1;
- pBox->x2 = x2;
- pBox->y2 = y2;
- pBox++;
- }
- }
- if (pBox != (BoxPtr) (pData + 1))
- {
- pData->size = nrects;
- pData->numRects = pBox - (BoxPtr) (pData + 1);
- pRgn->data = pData;
- if (ctype != CT_YXBANDED)
- {
- Bool overlap; /* result ignored */
- pRgn->extents.x1 = pRgn->extents.x2 = 0;
- miRegionValidate(pRgn, &overlap);
- }
- else
- miSetExtents(pRgn);
- good(pRgn);
- }
- else
- {
- free(pData);
- }
- return pRgn;
-}
-
-/*======================================================================
- * Region Subtraction
- *====================================================================*/
-
-
-/*-
- *-----------------------------------------------------------------------
- * miSubtractO --
- * Overlapping band subtraction. x1 is the left-most point not yet
- * checked.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * pReg may have rectangles added to it.
- *
- *-----------------------------------------------------------------------
- */
-/*ARGSUSED*/
-
-/*-
- *-----------------------------------------------------------------------
- * miSubtract --
- * Subtract regS from regM and leave the result in regD.
- * S stands for subtrahend, M for minuend and D for difference.
- *
- * Results:
- * TRUE if successful.
- *
- * Side Effects:
- * regD is overwritten.
- *
- *-----------------------------------------------------------------------
- */
-Bool
-miSubtract(RegionPtr regD, RegionPtr regM, RegionPtr regS)
-{
- return pixman_region_subtract (regD, regM, regS);
-}
-
-/*======================================================================
- * Region Inversion
- *====================================================================*/
-
-/*-
- *-----------------------------------------------------------------------
- * miInverse --
- * Take a region and a box and return a region that is everything
- * in the box but not in the region. The careful reader will note
- * that this is the same as subtracting the region from the box...
- *
- * Results:
- * TRUE.
- *
- * Side Effects:
- * newReg is overwritten.
- *
- *-----------------------------------------------------------------------
- */
-Bool
-miInverse(
- RegionPtr newReg, /* Destination region */
- RegionPtr reg1, /* Region to invert */
- BoxPtr invRect /* Bounding box for inversion */
- )
-{
- return pixman_region_inverse (newReg, reg1, invRect);
-}
-int
-miRectIn(RegionPtr region, BoxPtr prect)
-{
- return pixman_region_contains_rectangle (region, prect);
-}
-
-/* TranslateRegion(pReg, x, y)
- translates in place
-*/
-
-void
-miTranslateRegion(RegionPtr pReg, int x, int y)
-{
- pixman_region_translate (pReg, x, y);
-}
-
-void
-miRegionReset(RegionPtr pReg, BoxPtr pBox)
-{
- pixman_region_reset (pReg, pBox);
-}
-
-Bool
-miPointInRegion(
- RegionPtr pReg,
- int x,
- int y,
- BoxPtr box /* "return" value */
- )
-{
- return pixman_region_contains_point (pReg, x, y, box);
-}
-
-Bool
-miRegionNotEmpty(RegionPtr pReg)
-{
- return pixman_region_not_empty (pReg);
-}
-
-Bool
-miRegionBroken(RegionPtr pReg)
-{
- good(pReg);
- return (REGION_NAR(pReg));
-}
-
-void
-miRegionEmpty(RegionPtr pReg)
-{
- good(pReg);
- xfreeData(pReg);
- pReg->extents.x2 = pReg->extents.x1;
- pReg->extents.y2 = pReg->extents.y1;
- pReg->data = &miEmptyData;
-}
-
-BoxPtr
-miRegionExtents(RegionPtr pReg)
-{
- good(pReg);
- return(&pReg->extents);
-}
-
-#define ExchangeSpans(a, b) \
-{ \
- DDXPointRec tpt; \
- int tw; \
- \
- tpt = spans[a]; spans[a] = spans[b]; spans[b] = tpt; \
- tw = widths[a]; widths[a] = widths[b]; widths[b] = tw; \
-}
-
-/* ||| I should apply the merge sort code to rectangle sorting above, and see
- if mapping time can be improved. But right now I've been at work 12 hours,
- so forget it.
-*/
-
-static void QuickSortSpans(
- DDXPointRec spans[],
- int widths[],
- int numSpans)
-{
- int y;
- int i, j, m;
- DDXPointPtr r;
-
- /* Always called with numSpans > 1 */
- /* Sorts only by y, doesn't bother to sort by x */
-
- do
- {
- if (numSpans < 9)
- {
- /* Do insertion sort */
- int yprev;
-
- yprev = spans[0].y;
- i = 1;
- do
- { /* while i != numSpans */
- y = spans[i].y;
- if (yprev > y)
- {
- /* spans[i] is out of order. Move into proper location. */
- DDXPointRec tpt;
- int tw, k;
-
- for (j = 0; y >= spans[j].y; j++) {}
- tpt = spans[i];
- tw = widths[i];
- for (k = i; k != j; k--)
- {
- spans[k] = spans[k-1];
- widths[k] = widths[k-1];
- }
- spans[j] = tpt;
- widths[j] = tw;
- y = spans[i].y;
- } /* if out of order */
- yprev = y;
- i++;
- } while (i != numSpans);
- return;
- }
-
- /* Choose partition element, stick in location 0 */
- m = numSpans / 2;
- if (spans[m].y > spans[0].y) ExchangeSpans(m, 0);
- if (spans[m].y > spans[numSpans-1].y) ExchangeSpans(m, numSpans-1);
- if (spans[m].y > spans[0].y) ExchangeSpans(m, 0);
- y = spans[0].y;
-
- /* Partition array */
- i = 0;
- j = numSpans;
- do
- {
- r = &(spans[i]);
- do
- {
- r++;
- i++;
- } while (i != numSpans && r->y < y);
- r = &(spans[j]);
- do
- {
- r--;
- j--;
- } while (y < r->y);
- if (i < j)
- ExchangeSpans(i, j);
- } while (i < j);
-
- /* Move partition element back to middle */
- ExchangeSpans(0, j);
-
- /* Recurse */
- if (numSpans-j-1 > 1)
- QuickSortSpans(&spans[j+1], &widths[j+1], numSpans-j-1);
- numSpans = j;
- } while (numSpans > 1);
-}
-
-#define NextBand() \
-{ \
- clipy1 = pboxBandStart->y1; \
- clipy2 = pboxBandStart->y2; \
- pboxBandEnd = pboxBandStart + 1; \
- while (pboxBandEnd != pboxLast && pboxBandEnd->y1 == clipy1) { \
- pboxBandEnd++; \
- } \
- for (; ppt != pptLast && ppt->y < clipy1; ppt++, pwidth++) {} \
-}
-
-/*
- Clip a list of scanlines to a region. The caller has allocated the
- space. FSorted is non-zero if the scanline origins are in ascending
- order.
- returns the number of new, clipped scanlines.
-*/
-
-int
-miClipSpans(
- RegionPtr prgnDst,
- DDXPointPtr ppt,
- int *pwidth,
- int nspans,
- DDXPointPtr pptNew,
- int *pwidthNew,
- int fSorted)
-{
- DDXPointPtr pptLast;
- int *pwidthNewStart; /* the vengeance of Xerox! */
- int y, x1, x2;
- int numRects;
-
- good(prgnDst);
- pptLast = ppt + nspans;
- pwidthNewStart = pwidthNew;
-
- if (!prgnDst->data)
- {
- /* Do special fast code with clip boundaries in registers(?) */
- /* It doesn't pay much to make use of fSorted in this case,
- so we lump everything together. */
-
- int clipx1, clipx2, clipy1, clipy2;
-
- clipx1 = prgnDst->extents.x1;
- clipy1 = prgnDst->extents.y1;
- clipx2 = prgnDst->extents.x2;
- clipy2 = prgnDst->extents.y2;
-
- for (; ppt != pptLast; ppt++, pwidth++)
- {
- y = ppt->y;
- x1 = ppt->x;
- if (clipy1 <= y && y < clipy2)
- {
- x2 = x1 + *pwidth;
- if (x1 < clipx1) x1 = clipx1;
- if (x2 > clipx2) x2 = clipx2;
- if (x1 < x2)
- {
- /* part of span in clip rectangle */
- pptNew->x = x1;
- pptNew->y = y;
- *pwidthNew = x2 - x1;
- pptNew++;
- pwidthNew++;
- }
- }
- } /* end for */
-
- }
- else if ((numRects = prgnDst->data->numRects))
- {
- /* Have to clip against many boxes */
- BoxPtr pboxBandStart, pboxBandEnd;
- BoxPtr pbox;
- BoxPtr pboxLast;
- int clipy1, clipy2;
-
- /* In this case, taking advantage of sorted spans gains more than
- the sorting costs. */
- if ((! fSorted) && (nspans > 1))
- QuickSortSpans(ppt, pwidth, nspans);
-
- pboxBandStart = REGION_BOXPTR(prgnDst);
- pboxLast = pboxBandStart + numRects;
-
- NextBand();
-
- for (; ppt != pptLast; )
- {
- y = ppt->y;
- if (y < clipy2)
- {
- /* span is in the current band */
- pbox = pboxBandStart;
- x1 = ppt->x;
- x2 = x1 + *pwidth;
- do
- { /* For each box in band */
- int newx1, newx2;
-
- newx1 = x1;
- newx2 = x2;
- if (newx1 < pbox->x1) newx1 = pbox->x1;
- if (newx2 > pbox->x2) newx2 = pbox->x2;
- if (newx1 < newx2)
- {
- /* Part of span in clip rectangle */
- pptNew->x = newx1;
- pptNew->y = y;
- *pwidthNew = newx2 - newx1;
- pptNew++;
- pwidthNew++;
- }
- pbox++;
- } while (pbox != pboxBandEnd);
- ppt++;
- pwidth++;
- }
- else
- {
- /* Move to next band, adjust ppt as needed */
- pboxBandStart = pboxBandEnd;
- if (pboxBandStart == pboxLast)
- break; /* We're completely done */
- NextBand();
- }
- }
- }
- return (pwidthNew - pwidthNewStart);
-}
|