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rt-thread/rtgui/common/region.c

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/*
* File : region.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2009-10-16 Bernard first version
*/
#include <rtgui/region.h>
#include <rtgui/rtgui_system.h>
/* #define good(reg) RT_ASSERT(rtgui_region16_valid(reg)) */
#define good(reg)
#define RTGUI_MIN(a,b) ((a) < (b) ? (a) : (b))
#define RTGUI_MAX(a,b) ((a) > (b) ? (a) : (b))
#define RTGUI_SHRT_MIN (-32767-1)
#define RTGUI_SHRT_MAX 32767
#define PIXREGION_NIL(reg) ((reg)->data && !(reg)->data->numRects)
/* not a region */
#define PIXREGION_NAR(reg) ((reg)->data == &rtgui_brokendata)
#define PIXREGION_NUM_RECTS(reg) ((reg)->data ? (reg)->data->numRects : 1)
#define PIXREGION_SIZE(reg) ((reg)->data ? (reg)->data->size : 0)
#define PIXREGION_RECTS(reg) ((reg)->data ? (rtgui_rect_t *)((reg)->data + 1) \
: &(reg)->extents)
#define PIXREGION_BOXPTR(reg) ((rtgui_rect_t *)((reg)->data + 1))
#define PIXREGION_BOX(reg,i) (&PIXREGION_BOXPTR(reg)[i])
#define PIXREGION_TOP(reg) PIXREGION_BOX(reg, (reg)->data->numRects)
#define PIXREGION_END(reg) PIXREGION_BOX(reg, (reg)->data->numRects - 1)
#define PIXREGION_SZOF(n) (sizeof(rtgui_region_data_t) + ((n) * sizeof(rtgui_rect_t)))
rtgui_rect_t rtgui_empty_rect = {0, 0, 0, 0};
rtgui_point_t rtgui_empty_point = {0, 0};
static rtgui_region_data_t rtgui_region_emptydata = {0, 0};
static rtgui_region_data_t rtgui_brokendata = {0, 0};
static rtgui_region_status_t rtgui_break(rtgui_region_t *pReg);
/*
* 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 RTGUI_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 rtgui_region_validate in order to support several speed improvements to
* rtgui_region_validateTree. Bob Scheifler changed the representation to be more
* compact when empty or a single rectangle, and did a bunch of gratuitous
* reformatting. Carl Worth did further gratuitous reformatting while re-merging
* the server and client region code into libpixregion.
*/
/* 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 allocData(n) rtgui_malloc(PIXREGION_SZOF(n))
#define freeData(reg) if ((reg)->data && (reg)->data->size) rtgui_free((reg)->data)
#define RECTALLOC_BAIL(pReg,n,bail) \
if (!(pReg)->data || (((pReg)->data->numRects + (n)) > (pReg)->data->size)) \
if (!rtgui_rect_alloc(pReg, n)) { goto bail; }
#define RECTALLOC(pReg,n) \
if (!(pReg)->data || (((pReg)->data->numRects + (n)) > (pReg)->data->size)) \
if (!rtgui_rect_alloc(pReg, n)) { return RTGUI_REGION_STATUS_FAILURE; }
#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 (!rtgui_rect_alloc(pReg, 1)) \
return RTGUI_REGION_STATUS_FAILURE; \
pNextRect = PIXREGION_TOP(pReg); \
} \
ADDRECT(pNextRect,nx1,ny1,nx2,ny2); \
pReg->data->numRects++; \
RT_ASSERT(pReg->data->numRects<=pReg->data->size); \
}
#define DOWNSIZE(reg,numRects) \
if (((numRects) < ((reg)->data->size >> 1)) && ((reg)->data->size > 50)) \
{ \
rtgui_region_data_t * NewData; \
NewData = (rtgui_region_data_t *)rt_realloc((reg)->data, PIXREGION_SZOF(numRects)); \
if (NewData) \
{ \
NewData->size = (numRects); \
(reg)->data = NewData; \
} \
}
void rtgui_region_init(rtgui_region_t *region)
{
region->extents = rtgui_empty_rect;
region->data = &rtgui_region_emptydata;
}
void rtgui_region_init_rect(rtgui_region_t *region,
int x, int y, unsigned int width, unsigned int height)
{
region->extents.x1 = x;
region->extents.y1 = y;
region->extents.x2 = x + width;
region->extents.y2 = y + height;
region->data = RT_NULL;
}
void rtgui_region_init_with_extents(rtgui_region_t *region, rtgui_rect_t *extents)
{
region->extents = *extents;
region->data = RT_NULL;
}
void rtgui_region_fini (rtgui_region_t *region)
{
good (region);
freeData (region);
}
int rtgui_region_num_rects (rtgui_region_t *region)
{
return PIXREGION_NUM_RECTS (region);
}
rtgui_rect_t *rtgui_region_rects (rtgui_region_t *region)
{
return PIXREGION_RECTS (region);
}
static rtgui_region_status_t rtgui_break (rtgui_region_t *region)
{
freeData (region);
region->extents = rtgui_empty_rect;
region->data = &rtgui_brokendata;
return RTGUI_REGION_STATUS_FAILURE;
}
static rtgui_region_status_t rtgui_rect_alloc(rtgui_region_t * region, int n)
{
rtgui_region_data_t *data;
if (!region->data)
{
n++;
region->data = allocData(n);
if (!region->data) return rtgui_break (region);
region->data->numRects = 1;
*PIXREGION_BOXPTR(region) = region->extents;
}
else if (!region->data->size)
{
region->data = allocData(n);
if (!region->data) return rtgui_break (region);
region->data->numRects = 0;
}
else
{
if (n == 1)
{
n = region->data->numRects;
if (n > 500) /* XXX pick numbers out of a hat */
n = 250;
}
n += region->data->numRects;
data = (rtgui_region_data_t *)rt_realloc(region->data, PIXREGION_SZOF(n));
if (!data) return rtgui_break (region);
region->data = data;
}
region->data->size = n;
return RTGUI_REGION_STATUS_SUCCESS;
}
rtgui_region_status_t rtgui_region_copy(rtgui_region_t *dst, rtgui_region_t *src)
{
good(dst);
good(src);
if (dst == src)
return RTGUI_REGION_STATUS_SUCCESS;
dst->extents = src->extents;
if (!src->data || !src->data->size)
{
freeData(dst);
dst->data = src->data;
return RTGUI_REGION_STATUS_SUCCESS;
}
if (!dst->data || (dst->data->size < src->data->numRects))
{
freeData(dst);
dst->data = allocData(src->data->numRects);
if (!dst->data) return rtgui_break (dst);
dst->data->size = src->data->numRects;
}
dst->data->numRects = src->data->numRects;
rt_memmove((char *)PIXREGION_BOXPTR(dst),(char *)PIXREGION_BOXPTR(src),
dst->data->numRects * sizeof(rtgui_rect_t));
return RTGUI_REGION_STATUS_SUCCESS;
}
/*======================================================================
* Generic Region Operator
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_coalesce --
* 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 rtgui_op.
*
* 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.
* - region->data->numRects will be decreased.
*
*-----------------------------------------------------------------------
*/
rt_inline int
rtgui_coalesce (
rtgui_region_t *region, /* Region to coalesce */
int prevStart, /* Index of start of previous band */
int curStart) /* Index of start of current band */
{
rtgui_rect_t * pPrevBox; /* Current box in previous band */
rtgui_rect_t * 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;
RT_ASSERT(numRects == region->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 = PIXREGION_BOX(region, prevStart);
pCurBox = PIXREGION_BOX(region, 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;
region->data->numRects -= numRects;
do
{
pPrevBox--;
pPrevBox->y2 = y2;
numRects--;
}
while (numRects);
return prevStart;
}
/* Quicky macro to avoid trivial reject procedure calls to rtgui_coalesce */
#define Coalesce(newReg, prevBand, curBand) \
if (curBand - prevBand == newReg->data->numRects - curBand) { \
prevBand = rtgui_coalesce(newReg, prevBand, curBand); \
} else { \
prevBand = curBand; \
}
/*-
*-----------------------------------------------------------------------
* rtgui_region_appendNonO --
* 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:
* region->data->numRects is incremented and the rectangles overwritten
* with the rectangles we're passed.
*
*-----------------------------------------------------------------------
*/
rt_inline rtgui_region_status_t
rtgui_region_appendNonO (
rtgui_region_t *region,
rtgui_rect_t *r,
rtgui_rect_t *rEnd,
int y1,
int y2)
{
rtgui_rect_t * pNextRect;
int newRects;
newRects = rEnd - r;
RT_ASSERT(y1 < y2);
RT_ASSERT(newRects != 0);
/* Make sure we have enough space for all rectangles to be added */
RECTALLOC(region, newRects);
pNextRect = PIXREGION_TOP(region);
region->data->numRects += newRects;
do
{
RT_ASSERT(r->x1 < r->x2);
ADDRECT(pNextRect, r->x1, y1, r->x2, y2);
r++;
}
while (r != rEnd);
return RTGUI_REGION_STATUS_SUCCESS;
}
#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 = rEnd - r; \
if (newRects) { \
RECTALLOC(newReg, newRects); \
rt_memmove((char *)PIXREGION_TOP(newReg),(char *)r, \
newRects * sizeof(rtgui_rect_t)); \
newReg->data->numRects += newRects; \
} \
}
/*-
*-----------------------------------------------------------------------
* rtgui_op --
* Apply an operation to two regions. Called by rtgui_region_union, rtgui_region_inverse,
* rtgui_region_subtract, rtgui_region_intersect.... Both regions MUST have at least one
* rectangle, and cannot be the same object.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* The new region is overwritten.
* pOverlap set to RTGUI_REGION_STATUS_SUCCESS if overlapFunc ever returns RTGUI_REGION_STATUS_SUCCESS.
*
* 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 rtgui_region_status_t (*OverlapProcPtr)(
rtgui_region_t *region,
rtgui_rect_t *r1,
rtgui_rect_t *r1End,
rtgui_rect_t *r2,
rtgui_rect_t *r2End,
short y1,
short y2,
int *pOverlap);
static rtgui_region_status_t
rtgui_op(
rtgui_region_t *newReg, /* Place to store result */
rtgui_region_t *reg1, /* First region in operation */
rtgui_region_t *reg2, /* 2d region in operation */
OverlapProcPtr overlapFunc, /* Function to call for over-
* lapping bands */
int appendNon1, /* Append non-overlapping bands */
/* in region 1 ? */
int appendNon2, /* Append non-overlapping bands */
/* in region 2 ? */
int *pOverlap)
{
rtgui_rect_t * r1; /* Pointer into first region */
rtgui_rect_t * r2; /* Pointer into 2d region */
rtgui_rect_t * r1End; /* End of 1st region */
rtgui_rect_t * r2End; /* End of 2d region */
short ybot; /* Bottom of intersection */
short ytop; /* Top of intersection */
rtgui_region_data_t * 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 */
rtgui_rect_t * r1BandEnd; /* End of current band in r1 */
rtgui_rect_t * 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 (PIXREGION_NAR (reg1) || PIXREGION_NAR(reg2))
return rtgui_break (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 = PIXREGION_RECTS(reg1);
newSize = PIXREGION_NUM_RECTS(reg1);
r1End = r1 + newSize;
numRects = PIXREGION_NUM_RECTS(reg2);
r2 = PIXREGION_RECTS(reg2);
r2End = r2 + numRects;
RT_ASSERT(r1 != r1End);
RT_ASSERT(r2 != r2End);
oldData = (rtgui_region_data_t *)RT_NULL;
if (((newReg == reg1) && (newSize > 1)) ||
((newReg == reg2) && (numRects > 1)))
{
oldData = newReg->data;
newReg->data = &rtgui_region_emptydata;
}
/* guess at new size */
if (numRects > newSize)
newSize = numRects;
newSize <<= 1;
if (!newReg->data)
newReg->data = &rtgui_region_emptydata;
else if (newReg->data->size)
newReg->data->numRects = 0;
if (newSize > newReg->data->size)
if (!rtgui_rect_alloc(newReg, newSize))
return RTGUI_REGION_STATUS_FAILURE;
/*
* Initialize ybot.
* In the upcoRTGUI_MINg 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 = RTGUI_MIN(r1->y1, r2->y1);
/*
* prevBand serves to mark the start of the previous band so rectangles
* can be coalesced into larger rectangles. qv. rtgui_coalesce, 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 deterRTGUI_MINed 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.
*/
RT_ASSERT(r1 != r1End);
RT_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 = RTGUI_MAX(r1y1, ybot);
bot = RTGUI_MIN(r1->y2, r2y1);
if (top != bot)
{
curBand = newReg->data->numRects;
rtgui_region_appendNonO(newReg, r1, r1BandEnd, top, bot);
Coalesce(newReg, prevBand, curBand);
}
}
ytop = r2y1;
}
else if (r2y1 < r1y1)
{
if (appendNon2)
{
top = RTGUI_MAX(r2y1, ybot);
bot = RTGUI_MIN(r2->y2, r1y1);
if (top != bot)
{
curBand = newReg->data->numRects;
rtgui_region_appendNonO(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 = RTGUI_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;
rtgui_region_appendNonO(newReg, r1, r1BandEnd, RTGUI_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;
rtgui_region_appendNonO(newReg, r2, r2BandEnd, RTGUI_MAX(r2y1, ybot), r2->y2);
Coalesce(newReg, prevBand, curBand);
/* Append rest of boxes */
AppendRegions(newReg, r2BandEnd, r2End);
}
if (oldData)
rtgui_free(oldData);
numRects = newReg->data->numRects;
if (!numRects)
{
freeData(newReg);
newReg->data = &rtgui_region_emptydata;
}
else if (numRects == 1)
{
newReg->extents = *PIXREGION_BOXPTR(newReg);
freeData(newReg);
newReg->data = (rtgui_region_data_t *)RT_NULL;
}
else
{
DOWNSIZE(newReg, numRects);
}
return RTGUI_REGION_STATUS_SUCCESS;
}
/*-
*-----------------------------------------------------------------------
* rtgui_set_extents --
* Reset the extents of a region to what they should be. Called by
* rtgui_region_subtract and rtgui_region_intersect as they can't figure it out along the
* way or do so easily, as rtgui_region_union can.
*
* Results:
* None.
*
* Side Effects:
* The region's 'extents' structure is overwritten.
*
*-----------------------------------------------------------------------
*/
static void
rtgui_set_extents (rtgui_region_t *region)
{
rtgui_rect_t *box, *boxEnd;
if (!region->data)
return;
if (!region->data->size)
{
region->extents.x2 = region->extents.x1;
region->extents.y2 = region->extents.y1;
return;
}
box = PIXREGION_BOXPTR(region);
boxEnd = PIXREGION_END(region);
/*
* Since box is the first rectangle in the region, it must have the
* smallest y1 and since boxEnd is the last rectangle in the region,
* it must have the largest y2, because of banding. Initialize x1 and
* x2 from box and boxEnd, resp., as good things to initialize them
* to...
*/
region->extents.x1 = box->x1;
region->extents.y1 = box->y1;
region->extents.x2 = boxEnd->x2;
region->extents.y2 = boxEnd->y2;
RT_ASSERT(region->extents.y1 < region->extents.y2);
while (box <= boxEnd)
{
if (box->x1 < region->extents.x1)
region->extents.x1 = box->x1;
if (box->x2 > region->extents.x2)
region->extents.x2 = box->x2;
box++;
};
RT_ASSERT(region->extents.x1 < region->extents.x2);
}
/*======================================================================
* Region Intersection
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_region_intersectO --
* Handle an overlapping band for rtgui_region_intersect.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* Rectangles may be added to the region.
*
*-----------------------------------------------------------------------
*/
/*ARGSUSED*/
static rtgui_region_status_t
rtgui_region_intersectO (
rtgui_region_t *region,
rtgui_rect_t *r1,
rtgui_rect_t *r1End,
rtgui_rect_t *r2,
rtgui_rect_t *r2End,
short y1,
short y2,
int *pOverlap)
{
int x1;
int x2;
rtgui_rect_t * pNextRect;
pNextRect = PIXREGION_TOP(region);
RT_ASSERT(y1 < y2);
RT_ASSERT(r1 != r1End && r2 != r2End);
do
{
x1 = RTGUI_MAX(r1->x1, r2->x1);
x2 = RTGUI_MIN(r1->x2, r2->x2);
/*
* If there's any overlap between the two rectangles, add that
* overlap to the new region.
*/
if (x1 < x2)
NEWRECT(region, pNextRect, x1, y1, x2, y2);
/*
* Advance the pointer(s) with the leftmost right side, since the next
* rectangle on that list may still overlap the other region's
* current rectangle.
*/
if (r1->x2 == x2)
{
r1++;
}
if (r2->x2 == x2)
{
r2++;
}
}
while ((r1 != r1End) && (r2 != r2End));
return RTGUI_REGION_STATUS_SUCCESS;
}
rtgui_region_status_t
rtgui_region_intersect(rtgui_region_t *newReg,
rtgui_region_t *reg1,
rtgui_region_t *reg2)
{
good(reg1);
good(reg2);
good(newReg);
/* check for trivial reject */
if (PIXREGION_NIL(reg1) || PIXREGION_NIL(reg2) ||
!EXTENTCHECK(&reg1->extents, &reg2->extents))
{
/* Covers about 20% of all cases */
freeData(newReg);
newReg->extents.x2 = newReg->extents.x1;
newReg->extents.y2 = newReg->extents.y1;
if (PIXREGION_NAR(reg1) || PIXREGION_NAR(reg2))
{
newReg->data = &rtgui_brokendata;
return RTGUI_REGION_STATUS_FAILURE;
}
else
newReg->data = &rtgui_region_emptydata;
}
else if (!reg1->data && !reg2->data)
{
/* Covers about 80% of cases that aren't trivially rejected */
newReg->extents.x1 = RTGUI_MAX(reg1->extents.x1, reg2->extents.x1);
newReg->extents.y1 = RTGUI_MAX(reg1->extents.y1, reg2->extents.y1);
newReg->extents.x2 = RTGUI_MIN(reg1->extents.x2, reg2->extents.x2);
newReg->extents.y2 = RTGUI_MIN(reg1->extents.y2, reg2->extents.y2);
freeData(newReg);
newReg->data = (rtgui_region_data_t *)RT_NULL;
}
else if (!reg2->data && SUBSUMES(&reg2->extents, &reg1->extents))
{
return rtgui_region_copy(newReg, reg1);
}
else if (!reg1->data && SUBSUMES(&reg1->extents, &reg2->extents))
{
return rtgui_region_copy(newReg, reg2);
}
else if (reg1 == reg2)
{
return rtgui_region_copy(newReg, reg1);
}
else
{
/* General purpose intersection */
int overlap; /* result ignored */
if (!rtgui_op(newReg, reg1, reg2, rtgui_region_intersectO, RTGUI_REGION_STATUS_FAILURE, RTGUI_REGION_STATUS_FAILURE,
&overlap))
return RTGUI_REGION_STATUS_FAILURE;
rtgui_set_extents(newReg);
}
good(newReg);
return(RTGUI_REGION_STATUS_SUCCESS);
}
rtgui_region_status_t
rtgui_region_intersect_rect(rtgui_region_t *newReg,
rtgui_region_t *reg1,
rtgui_rect_t *rect)
{
rtgui_region_t region;
region.data = RT_NULL;
region.extents.x1 = rect->x1;
region.extents.y1 = rect->y1;
region.extents.x2 = rect->x2;
region.extents.y2 = rect->y2;
return rtgui_region_intersect(newReg, reg1, &region);
}
#define MERGERECT(r) \
{ \
if (r->x1 <= x2) { \
/* Merge with current rectangle */ \
if (r->x1 < x2) *pOverlap = RTGUI_REGION_STATUS_SUCCESS; \
if (x2 < r->x2) x2 = r->x2; \
} else { \
/* Add current rectangle, start new one */ \
NEWRECT(region, pNextRect, x1, y1, x2, y2); \
x1 = r->x1; \
x2 = r->x2; \
} \
r++; \
}
/*======================================================================
* Region Union
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_region_unionO --
* Handle an overlapping band for the union operation. Picks the
* left-most rectangle each time and merges it into the region.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* region is overwritten.
* pOverlap is set to RTGUI_REGION_STATUS_SUCCESS if any boxes overlap.
*
*-----------------------------------------------------------------------
*/
static rtgui_region_status_t
rtgui_region_unionO (
rtgui_region_t *region,
rtgui_rect_t *r1,
rtgui_rect_t *r1End,
rtgui_rect_t *r2,
rtgui_rect_t *r2End,
short y1,
short y2,
int *pOverlap)
{
rtgui_rect_t * pNextRect;
int x1; /* left and right side of current union */
int x2;
RT_ASSERT (y1 < y2);
RT_ASSERT(r1 != r1End && r2 != r2End);
pNextRect = PIXREGION_TOP(region);
/* 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(region, pNextRect, x1, y1, x2, y2);
return RTGUI_REGION_STATUS_SUCCESS;
}
/* Convenience function for perforRTGUI_MINg union of region with a single rectangle */
rtgui_region_status_t
rtgui_region_union_rect(rtgui_region_t *dest, rtgui_region_t *source, rtgui_rect_t* rect)
{
rtgui_region_t region;
region.data = RT_NULL;
region.extents.x1 = rect->x1;
region.extents.y1 = rect->y1;
region.extents.x2 = rect->x2;
region.extents.y2 = rect->y2;
return rtgui_region_union (dest, source, &region);
}
rtgui_region_status_t
rtgui_region_union(rtgui_region_t *newReg, rtgui_region_t *reg1, rtgui_region_t *reg2)
{
int overlap; /* result ignored */
/* Return RTGUI_REGION_STATUS_SUCCESS if some overlap between reg1, reg2 */
good(reg1);
good(reg2);
good(newReg);
/* checks all the simple cases */
/*
* Region 1 and 2 are the same
*/
if (reg1 == reg2)
{
return rtgui_region_copy(newReg, reg1);
}
/*
* Region 1 is empty
*/
if (PIXREGION_NIL(reg1))
{
if (PIXREGION_NAR(reg1)) return rtgui_break (newReg);
if (newReg != reg2)
return rtgui_region_copy(newReg, reg2);
return RTGUI_REGION_STATUS_SUCCESS;
}
/*
* Region 2 is empty
*/
if (PIXREGION_NIL(reg2))
{
if (PIXREGION_NAR(reg2)) return rtgui_break (newReg);
if (newReg != reg1)
return rtgui_region_copy(newReg, reg1);
return RTGUI_REGION_STATUS_SUCCESS;
}
/*
* Region 1 completely subsumes region 2
*/
if (!reg1->data && SUBSUMES(&reg1->extents, &reg2->extents))
{
if (newReg != reg1)
return rtgui_region_copy(newReg, reg1);
return RTGUI_REGION_STATUS_SUCCESS;
}
/*
* Region 2 completely subsumes region 1
*/
if (!reg2->data && SUBSUMES(&reg2->extents, &reg1->extents))
{
if (newReg != reg2)
return rtgui_region_copy(newReg, reg2);
return RTGUI_REGION_STATUS_SUCCESS;
}
if (!rtgui_op(newReg, reg1, reg2, rtgui_region_unionO, RTGUI_REGION_STATUS_SUCCESS, RTGUI_REGION_STATUS_SUCCESS, &overlap))
return RTGUI_REGION_STATUS_FAILURE;
newReg->extents.x1 = RTGUI_MIN(reg1->extents.x1, reg2->extents.x1);
newReg->extents.y1 = RTGUI_MIN(reg1->extents.y1, reg2->extents.y1);
newReg->extents.x2 = RTGUI_MAX(reg1->extents.x2, reg2->extents.x2);
newReg->extents.y2 = RTGUI_MAX(reg1->extents.y2, reg2->extents.y2);
good(newReg);
return RTGUI_REGION_STATUS_SUCCESS;
}
/*======================================================================
* Batch Rectangle Union
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_region_append --
*
* "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 rtgui_region_validate to ensure that a valid region is constructed.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* dstrgn is modified if rgn has rectangles.
*
*/
rtgui_region_status_t
rtgui_region_append(rtgui_region_t *dstrgn,
rtgui_region_t *rgn)
{
int numRects, dnumRects, size;
rtgui_rect_t *new, *old;
int prepend;
if (PIXREGION_NAR(rgn)) return rtgui_break (dstrgn);
if (!rgn->data && (dstrgn->data == &rtgui_region_emptydata))
{
dstrgn->extents = rgn->extents;
dstrgn->data = (rtgui_region_data_t *)RT_NULL;
return RTGUI_REGION_STATUS_SUCCESS;
}
numRects = PIXREGION_NUM_RECTS(rgn);
if (!numRects)
return RTGUI_REGION_STATUS_SUCCESS;
prepend = RTGUI_REGION_STATUS_FAILURE;
size = numRects;
dnumRects = PIXREGION_NUM_RECTS(dstrgn);
if (!dnumRects && (size < 200))
size = 200; /* XXX pick numbers out of a hat */
RECTALLOC(dstrgn, size);
old = PIXREGION_RECTS(rgn);
if (!dnumRects)
dstrgn->extents = rgn->extents;
else if (dstrgn->extents.x2 > dstrgn->extents.x1)
{
rtgui_rect_t *first, *last;
first = old;
last = PIXREGION_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 = PIXREGION_BOXPTR(dstrgn);
last = old + (numRects - 1);
if ((first->y1 > last->y2) ||
((first->y1 == last->y1) && (first->y2 == last->y2) &&
(first->x1 > last->x2)))
{
prepend = RTGUI_REGION_STATUS_SUCCESS;
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 = PIXREGION_BOX(dstrgn, numRects);
if (dnumRects == 1)
*new = *PIXREGION_BOXPTR(dstrgn);
else
rt_memmove((char *)new,(char *)PIXREGION_BOXPTR(dstrgn),
dnumRects * sizeof(rtgui_rect_t));
new = PIXREGION_BOXPTR(dstrgn);
}
else
new = PIXREGION_BOXPTR(dstrgn) + dnumRects;
if (numRects == 1)
*new = *old;
else
rt_memmove((char *)new, (char *)old, numRects * sizeof(rtgui_rect_t));
dstrgn->data->numRects += numRects;
return RTGUI_REGION_STATUS_SUCCESS;
}
#define ExchangeRects(a, b) \
{ \
rtgui_rect_t t; \
t = rects[a]; \
rects[a] = rects[b]; \
rects[b] = t; \
}
static void QuickSortRects(rtgui_rect_t rects[], int numRects)
{
int y1;
int x1;
int i, j;
rtgui_rect_t *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);
}
/*-
*-----------------------------------------------------------------------
* rtgui_region_validate --
*
* 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:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* The passed-in ``region'' may be modified.
* pOverlap set to RTGUI_REGION_STATUS_SUCCESS if any retangles overlapped, else RTGUI_REGION_STATUS_FAILURE;
*
* Strategy:
* Step 1. Sort the rectangles into ascending order with primary key y1
* and secondary key x1.
*
* Step 2. Split the rectangles into the RTGUI_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 transformation (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
* rtgui_region_union. Maximize the work each rtgui_region_union call does by using
* a binary merge.
*
*-----------------------------------------------------------------------
*/
rtgui_region_status_t rtgui_region_validate(rtgui_region_t * badreg,
int *pOverlap)
{
/* Descriptor for regions under construction in Step 2. */
typedef struct
{
rtgui_region_t 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] */
rtgui_region_t * reg; /* ri[j].reg */
rtgui_rect_t * box; /* Current box in rects */
rtgui_rect_t * riBox; /* Last box in ri[j].reg */
rtgui_region_t * hreg; /* ri[j_half].reg */
rtgui_region_status_t ret = RTGUI_REGION_STATUS_SUCCESS;
*pOverlap = RTGUI_REGION_STATUS_FAILURE;
if (!badreg->data)
{
good(badreg);
return RTGUI_REGION_STATUS_SUCCESS;
}
numRects = badreg->data->numRects;
if (!numRects)
{
if (PIXREGION_NAR(badreg))
return RTGUI_REGION_STATUS_FAILURE;
good(badreg);
return RTGUI_REGION_STATUS_SUCCESS;
}
if (badreg->extents.x1 < badreg->extents.x2)
{
if ((numRects) == 1)
{
freeData(badreg);
badreg->data = (rtgui_region_data_t *) RT_NULL;
}
else
{
DOWNSIZE(badreg, numRects);
}
good(badreg);
return RTGUI_REGION_STATUS_SUCCESS;
}
/* Step 1: Sort the rects array into ascending (y1, x1) order */
QuickSortRects(PIXREGION_BOXPTR(badreg), numRects);
/* Step 2: Scatter the sorted array into the RTGUI_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 *) rtgui_malloc(4 * sizeof(RegionInfo));
if (!ri) return rtgui_break (badreg);
sizeRI = 4;
numRI = 1;
ri[0].prevBand = 0;
ri[0].curBand = 0;
ri[0].reg = *badreg;
box = PIXREGION_BOXPTR(&ri[0].reg);
ri[0].reg.extents = *box;
ri[0].reg.data->numRects = 1;
/* Now scatter rectangles into the RTGUI_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 = PIXREGION_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 = RTGUI_REGION_STATUS_SUCCESS;
if (box->x2 > riBox->x2) riBox->x2 = box->x2;
}
else
{
RECTALLOC_BAIL(reg, 1, bail);
*PIXREGION_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);
*PIXREGION_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 *) rt_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 = (rtgui_region_data_t *)RT_NULL;
if (!rtgui_rect_alloc(&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 = PIXREGION_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 */
{
freeData(reg);
reg->data = (rtgui_region_data_t *)RT_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 (!rtgui_op(reg, reg, hreg, rtgui_region_unionO, RTGUI_REGION_STATUS_SUCCESS, RTGUI_REGION_STATUS_SUCCESS, pOverlap))
ret = RTGUI_REGION_STATUS_FAILURE;
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;
freeData(hreg);
}
numRI -= half;
}
*badreg = ri[0].reg;
rtgui_free(ri);
good(badreg);
return ret;
bail:
for (i = 0; i < numRI; i++)
freeData(&ri[i].reg);
rtgui_free (ri);
return rtgui_break (badreg);
}
/*======================================================================
* Region Subtraction
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_region_subtractO --
* Overlapping band subtraction. x1 is the left-most point not yet
* checked.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* region may have rectangles added to it.
*
*-----------------------------------------------------------------------
*/
/*ARGSUSED*/
static rtgui_region_status_t
rtgui_region_subtractO (
rtgui_region_t *region,
rtgui_rect_t *r1,
rtgui_rect_t *r1End,
rtgui_rect_t *r2,
rtgui_rect_t *r2End,
short y1,
short y2,
int *pOverlap)
{
rtgui_rect_t * pNextRect;
int x1;
x1 = r1->x1;
RT_ASSERT(y1<y2);
RT_ASSERT(r1 != r1End && r2 != r2End);
pNextRect = PIXREGION_TOP(region);
do
{
if (r2->x2 <= x1)
{
/*
* Subtrahend entirely to left of minuend: go to next subtrahend.
*/
r2++;
}
else if (r2->x1 <= x1)
{
/*
* Subtrahend preceeds RTGUI_MINuend: nuke left edge of minuend.
*/
x1 = r2->x2;
if (x1 >= r1->x2)
{
/*
* Minuend completely covered: advance to next minuend and
* reset left fence to edge of new RTGUI_MINuend.
*/
r1++;
if (r1 != r1End)
x1 = r1->x1;
}
else
{
/*
* Subtrahend now used up since it doesn't extend beyond
* minuend
*/
r2++;
}
}
else if (r2->x1 < r1->x2)
{
/*
* Left part of subtrahend covers part of minuend: add uncovered
* part of minuend to region and skip to next subtrahend.
*/
RT_ASSERT(x1<r2->x1);
NEWRECT(region, pNextRect, x1, y1, r2->x1, y2);
x1 = r2->x2;
if (x1 >= r1->x2)
{
/*
* Minuend used up: advance to new...
*/
r1++;
if (r1 != r1End)
x1 = r1->x1;
}
else
{
/*
* Subtrahend used up
*/
r2++;
}
}
else
{
/*
* Minuend used up: add any remaining piece before advancing.
*/
if (r1->x2 > x1)
NEWRECT(region, pNextRect, x1, y1, r1->x2, y2);
r1++;
if (r1 != r1End)
x1 = r1->x1;
}
}
while ((r1 != r1End) && (r2 != r2End));
/*
* Add remaining minuend rectangles to region.
*/
while (r1 != r1End)
{
RT_ASSERT(x1<r1->x2);
NEWRECT(region, pNextRect, x1, y1, r1->x2, y2);
r1++;
if (r1 != r1End)
x1 = r1->x1;
}
return RTGUI_REGION_STATUS_SUCCESS;
}
/*-
*-----------------------------------------------------------------------
* rtgui_region_subtract --
* Subtract regS from regM and leave the result in regD.
* S stands for subtrahend, M for minuend and D for difference.
*
* Results:
* RTGUI_REGION_STATUS_SUCCESS if successful.
*
* Side Effects:
* regD is overwritten.
*
*-----------------------------------------------------------------------
*/
rtgui_region_status_t
rtgui_region_subtract(rtgui_region_t *regD,
rtgui_region_t *regM,
rtgui_region_t *regS)
{
int overlap; /* result ignored */
good(regM);
good(regS);
good(regD);
/* check for trivial rejects */
if (PIXREGION_NIL(regM) || PIXREGION_NIL(regS) ||
!EXTENTCHECK(&regM->extents, &regS->extents))
{
if (PIXREGION_NAR (regS)) return rtgui_break (regD);
return rtgui_region_copy(regD, regM);
}
else if (regM == regS)
{
freeData(regD);
regD->extents.x2 = regD->extents.x1;
regD->extents.y2 = regD->extents.y1;
regD->data = &rtgui_region_emptydata;
return RTGUI_REGION_STATUS_SUCCESS;
}
/* Add those rectangles in region 1 that aren't in region 2,
do yucky substraction for overlaps, and
just throw away rectangles in region 2 that aren't in region 1 */
if (!rtgui_op(regD, regM, regS, rtgui_region_subtractO, RTGUI_REGION_STATUS_SUCCESS, RTGUI_REGION_STATUS_FAILURE, &overlap))
return RTGUI_REGION_STATUS_FAILURE;
/*
* Can't alter RegD's extents before we call rtgui_op because
* it might be one of the source regions and rtgui_op depends
* on the extents of those regions being unaltered. Besides, this
* way there's no checking against rectangles that will be nuked
* due to coalescing, so we have to exaRTGUI_MINe fewer rectangles.
*/
rtgui_set_extents(regD);
good(regD);
return RTGUI_REGION_STATUS_SUCCESS;
}
rtgui_region_status_t
rtgui_region_subtract_rect (rtgui_region_t *regD, rtgui_region_t *regM, rtgui_rect_t* rect)
{
rtgui_region_t region;
region.data = RT_NULL;
region.extents.x1 = rect->x1;
region.extents.y1 = rect->y1;
region.extents.x2 = rect->x2;
region.extents.y2 = rect->y2;
return rtgui_region_subtract(regD, regM, &region);
}
/*======================================================================
* Region Inversion
*====================================================================*/
/*-
*-----------------------------------------------------------------------
* rtgui_region_inverse --
* 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:
* RTGUI_REGION_STATUS_SUCCESS.
*
* Side Effects:
* newReg is overwritten.
*
*-----------------------------------------------------------------------
*/
rtgui_region_status_t
rtgui_region_inverse(rtgui_region_t *newReg, /* Destination region */
rtgui_region_t *reg1, /* Region to invert */
rtgui_rect_t *invRect) /* Bounding box for inversion */
{
rtgui_region_t invReg; /* Quick and dirty region made from the
* bounding box */
int overlap; /* result ignored */
good(reg1);
good(newReg);
/* check for trivial rejects */
if (PIXREGION_NIL(reg1) || !EXTENTCHECK(invRect, &reg1->extents))
{
if (PIXREGION_NAR(reg1)) return rtgui_break (newReg);
newReg->extents = *invRect;
freeData(newReg);
newReg->data = (rtgui_region_data_t *)RT_NULL;
return RTGUI_REGION_STATUS_SUCCESS;
}
/* Add those rectangles in region 1 that aren't in region 2,
do yucky substraction for overlaps, and
just throw away rectangles in region 2 that aren't in region 1 */
invReg.extents = *invRect;
invReg.data = (rtgui_region_data_t *)RT_NULL;
if (!rtgui_op(newReg, &invReg, reg1, rtgui_region_subtractO, RTGUI_REGION_STATUS_SUCCESS, RTGUI_REGION_STATUS_FAILURE, &overlap))
return RTGUI_REGION_STATUS_FAILURE;
/*
* Can't alter newReg's extents before we call rtgui_op because
* it might be one of the source regions and rtgui_op depends
* on the extents of those regions being unaltered. Besides, this
* way there's no checking against rectangles that will be nuked
* due to coalescing, so we have to exaRTGUI_MINe fewer rectangles.
*/
rtgui_set_extents(newReg);
good(newReg);
return RTGUI_REGION_STATUS_SUCCESS;
}
/*
* RectIn(region, rect)
* This routine takes a pointer to a region and a pointer to a box
* and deterRTGUI_MINes if the box is outside/inside/partly inside the region.
*
* The idea is to travel through the list of rectangles trying to cover the
* passed box with them. Anytime a piece of the rectangle isn't covered
* by a band of rectangles, partOut is set RTGUI_REGION_STATUS_SUCCESS. Any time a rectangle in
* the region covers part of the box, partIn is set RTGUI_REGION_STATUS_SUCCESS. The process ends
* when either the box has been completely covered (we reached a band that
* doesn't overlap the box, partIn is RTGUI_REGION_STATUS_SUCCESS and partOut is false), the
* box has been partially covered (partIn == partOut == RTGUI_REGION_STATUS_SUCCESS -- because of
* the banding, the first time this is true we know the box is only
* partially in the region) or is outside the region (we reached a band
* that doesn't overlap the box at all and partIn is false)
*/
int rtgui_region_contains_rectangle(rtgui_region_t *region, rtgui_rect_t *prect)
{
int x;
int y;
rtgui_rect_t * pbox;
rtgui_rect_t * pboxEnd;
int partIn, partOut;
int numRects;
good(region);
numRects = PIXREGION_NUM_RECTS(region);
/* useful optimization */
if (!numRects || !EXTENTCHECK(&region->extents, prect))
return(RTGUI_REGION_OUT);
if (numRects == 1)
{
/* We know that it must be rgnIN or rgnPART */
if (SUBSUMES(&region->extents, prect))
return(RTGUI_REGION_IN);
else
return(RTGUI_REGION_PART);
}
partOut = RTGUI_REGION_STATUS_FAILURE;
partIn = RTGUI_REGION_STATUS_FAILURE;
/* (x,y) starts at upper left of rect, moving to the right and down */
x = prect->x1;
y = prect->y1;
/* can stop when both partOut and partIn are RTGUI_REGION_STATUS_SUCCESS, or we reach prect->y2 */
for (pbox = PIXREGION_BOXPTR(region), pboxEnd = pbox + numRects;
pbox != pboxEnd;
pbox++)
{
if (pbox->y2 <= y)
continue; /* getting up to speed or skipping remainder of band */
if (pbox->y1 > y)
{
partOut = RTGUI_REGION_STATUS_SUCCESS; /* missed part of rectangle above */
if (partIn || (pbox->y1 >= prect->y2))
break;
y = pbox->y1; /* x guaranteed to be == prect->x1 */
}
if (pbox->x2 <= x)
continue; /* not far enough over yet */
if (pbox->x1 > x)
{
partOut = RTGUI_REGION_STATUS_SUCCESS; /* missed part of rectangle to left */
if (partIn)
break;
}
if (pbox->x1 < prect->x2)
{
partIn = RTGUI_REGION_STATUS_SUCCESS; /* definitely overlap */
if (partOut)
break;
}
if (pbox->x2 >= prect->x2)
{
y = pbox->y2; /* finished with this band */
if (y >= prect->y2)
break;
x = prect->x1; /* reset x out to left again */
}
else
{
/*
* Because boxes in a band are maximal width, if the first box
* to overlap the rectangle doesn't completely cover it in that
* band, the rectangle must be partially out, since some of it
* will be uncovered in that band. partIn will have been set true
* by now...
*/
partOut = RTGUI_REGION_STATUS_SUCCESS;
break;
}
}
return(partIn ? ((y < prect->y2) ? RTGUI_REGION_PART : RTGUI_REGION_IN) : RTGUI_REGION_OUT);
}
/* rtgui_region_translate (region, x, y)
translates in place
*/
void rtgui_region_translate (rtgui_region_t *region, int x, int y)
{
int x1, x2, y1, y2;
int nbox;
rtgui_rect_t * pbox;
good(region);
region->extents.x1 = x1 = region->extents.x1 + x;
region->extents.y1 = y1 = region->extents.y1 + y;
region->extents.x2 = x2 = region->extents.x2 + x;
region->extents.y2 = y2 = region->extents.y2 + y;
if (((x1 - RTGUI_SHRT_MIN)|(y1 - RTGUI_SHRT_MIN)|(RTGUI_SHRT_MAX - x2)|(RTGUI_SHRT_MAX - y2)) >= 0)
{
nbox = region->data->numRects;
if (region->data && nbox)
{
for (pbox = PIXREGION_BOXPTR(region); nbox--; pbox++)
{
pbox->x1 += x;
pbox->y1 += y;
pbox->x2 += x;
pbox->y2 += y;
}
}
return;
}
if (((x2 - RTGUI_SHRT_MIN)|(y2 - RTGUI_SHRT_MIN)|(RTGUI_SHRT_MAX - x1)|(RTGUI_SHRT_MAX - y1)) <= 0)
{
region->extents.x2 = region->extents.x1;
region->extents.y2 = region->extents.y1;
freeData(region);
region->data = &rtgui_region_emptydata;
return;
}
if (x1 < RTGUI_SHRT_MIN)
region->extents.x1 = RTGUI_SHRT_MIN;
else if (x2 > RTGUI_SHRT_MAX)
region->extents.x2 = RTGUI_SHRT_MAX;
if (y1 < RTGUI_SHRT_MIN)
region->extents.y1 = RTGUI_SHRT_MIN;
else if (y2 > RTGUI_SHRT_MAX)
region->extents.y2 = RTGUI_SHRT_MAX;
nbox = region->data->numRects;
if (region->data && nbox)
{
rtgui_rect_t * pboxout;
for (pboxout = pbox = PIXREGION_BOXPTR(region); nbox--; pbox++)
{
pboxout->x1 = x1 = pbox->x1 + x;
pboxout->y1 = y1 = pbox->y1 + y;
pboxout->x2 = x2 = pbox->x2 + x;
pboxout->y2 = y2 = pbox->y2 + y;
if (((x2 - RTGUI_SHRT_MIN)|(y2 - RTGUI_SHRT_MIN)|
(RTGUI_SHRT_MAX - x1)|(RTGUI_SHRT_MAX - y1)) <= 0)
{
region->data->numRects--;
continue;
}
if (x1 < RTGUI_SHRT_MIN)
pboxout->x1 = RTGUI_SHRT_MIN;
else if (x2 > RTGUI_SHRT_MAX)
pboxout->x2 = RTGUI_SHRT_MAX;
if (y1 < RTGUI_SHRT_MIN)
pboxout->y1 = RTGUI_SHRT_MIN;
else if (y2 > RTGUI_SHRT_MAX)
pboxout->y2 = RTGUI_SHRT_MAX;
pboxout++;
}
if (pboxout != pbox)
{
if (region->data->numRects == 1)
{
region->extents = *PIXREGION_BOXPTR(region);
freeData(region);
region->data = (rtgui_region_data_t *)RT_NULL;
}
else
rtgui_set_extents(region);
}
}
}
void rtgui_region_reset(rtgui_region_t *region, rtgui_rect_t* rect)
{
good(region);
freeData(region);
rtgui_region_init_with_extents(region, rect);
}
/* box is "return" value */
int rtgui_region_contains_point(rtgui_region_t * region,
int x, int y,
rtgui_rect_t * box)
{
rtgui_rect_t *pbox, *pboxEnd;
int numRects;
good(region);
numRects = PIXREGION_NUM_RECTS(region);
if (!numRects || !INBOX(&region->extents, x, y))
return -RT_ERROR;
if (numRects == 1)
{
*box = region->extents;
return RT_EOK;
}
for (pbox = PIXREGION_BOXPTR(region), pboxEnd = pbox + numRects;
pbox != pboxEnd;
pbox++)
{
if (y >= pbox->y2)
continue; /* not there yet */
if ((y < pbox->y1) || (x < pbox->x1))
break; /* missed it */
if (x >= pbox->x2)
continue; /* not there yet */
*box = *pbox;
return RT_EOK;
}
return -RT_ERROR;
}
int rtgui_region_not_empty(rtgui_region_t * region)
{
good(region);
return(!PIXREGION_NIL(region));
}
void rtgui_region_empty(rtgui_region_t * region)
{
good(region);
freeData(region);
region->extents = rtgui_empty_rect;
region->data = &rtgui_region_emptydata;
}
rtgui_rect_t *rtgui_region_extents(rtgui_region_t * region)
{
good(region);
return(&region->extents);
}
#define ExchangeSpans(a, b) \
{ \
rtgui_point_t 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(
rtgui_point_t spans[],
int widths[],
int numSpans)
{
int y;
int i, j, m;
rtgui_point_t *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. */
rtgui_point_t 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);
}
void rtgui_region_dump(rtgui_region_t* region)
{
int num;
int i;
rtgui_rect_t * rects;
num = PIXREGION_NUM_RECTS(region);
rects = PIXREGION_RECTS(region);
rt_kprintf("extents: (%d,%d) (%d,%d)\n",
region->extents.x1, region->extents.y1,
region->extents.x2, region->extents.y2);
for (i = 0; i < num; i++)
{
rt_kprintf("box[%d]: (%d,%d) (%d,%d)\n", i,
rects[i].x1, rects[i].y1,
rects[i].x2, rects[i].y2);
}
}
void rtgui_rect_moveto(rtgui_rect_t *rect, int x, int y)
{
rect->x1 += x;
rect->x2 += x;
rect->y1 += y;
rect->y2 += y;
}
void rtgui_rect_moveto_align(rtgui_rect_t *rect, rtgui_rect_t *to, int align)
{
int dw, dh;
dw = 0;
dh = 0;
/* get delta width and height */
dw = rtgui_rect_width(*rect) - rtgui_rect_width(*to);
dh = rtgui_rect_height(*rect) - rtgui_rect_height(*to);
if (dw < 0) dw = 0;
if (dh < 0) dh = 0;
/* move to insider of rect */
rtgui_rect_moveto(to, rect->x1, rect->y1);
/* limited the destination rect to source rect */
if (dw == 0) to->x2 = rect->x2;
if (dh == 0) to->y2 = rect->y2;
/* align to right */
if (align & RTGUI_ALIGN_RIGHT)
{
to->x1 += dw;
to->x2 += dw;
}
/* align to bottom */
if (align & RTGUI_ALIGN_BOTTOM)
{
to->y1 += dh;
to->y2 += dh;
}
/* align to center horizontal */
if (align & RTGUI_ALIGN_CENTER_HORIZONTAL)
{
to->x1 += dw >> 1;
to->x2 += dw >> 1;
}
/* align to center vertical */
if (align & RTGUI_ALIGN_CENTER_VERTICAL)
{
to->y1 += dh >> 1;
to->y2 += dh >> 1;
}
}
void rtgui_rect_inflate(rtgui_rect_t *rect, int d)
{
rect->x1 -= d;
rect->x2 += d;
rect->y1 -= d;
rect->y2 += d;
}
/* put the intersect of src rect and dest rect to dest */
void rtgui_rect_intersect(rtgui_rect_t *src, rtgui_rect_t *dest)
{
if (dest->x1 < src->x1) dest->x1 = src->x1;
if (dest->y1 < src->y1) dest->y1 = src->y1;
if (dest->x2 > src->x2) dest->x2 = src->x2;
if (dest->y2 > src->y2) dest->y2 = src->y2;
}
int rtgui_rect_contains_point(rtgui_rect_t *rect, int x, int y)
{
if (INBOX(rect, x, y)) return RT_EOK;
return -RT_ERROR;
}
int rtgui_rect_is_intersect(rtgui_rect_t *rect1, rtgui_rect_t *rect2)
{
if (INBOX(rect1, rect2->x1, rect2->y1) ||
INBOX(rect1, rect2->x1, rect2->y2) ||
INBOX(rect1, rect2->x2, rect2->y1) ||
INBOX(rect1, rect2->x2, rect2->y2))
{
return RT_EOK;
}
else if (INBOX(rect2, rect1->x1, rect1->y1) ||
INBOX(rect2, rect1->x1, rect1->y2) ||
INBOX(rect2, rect1->x2, rect1->y1) ||
INBOX(rect2, rect1->x2, rect1->y2))
{
return RT_EOK;
}
return -RT_ERROR;
}
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