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Diffstat (limited to 'libs/pixman-0.40.0/pixman/pixman-region.c')
| -rw-r--r-- | libs/pixman-0.40.0/pixman/pixman-region.c | 2792 |
1 files changed, 2792 insertions, 0 deletions
diff --git a/libs/pixman-0.40.0/pixman/pixman-region.c b/libs/pixman-0.40.0/pixman/pixman-region.c new file mode 100644 index 0000000..59bc9c7 --- /dev/null +++ b/libs/pixman-0.40.0/pixman/pixman-region.c @@ -0,0 +1,2792 @@ +/* + * 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. + * + * Copyright © 1998 Keith Packard + * + * 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, and that the name of Keith Packard not be used in + * advertising or publicity pertaining to distribution of the software without + * specific, written prior permission. Keith Packard makes no + * representations about the suitability of this software for any purpose. It + * is provided "as is" without express or implied warranty. + * + * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL KEITH PACKARD 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. + */ + +#include <stdlib.h> +#include <limits.h> +#include <string.h> +#include <stdio.h> +#include "pixman-private.h" + +#define PIXREGION_NIL(reg) ((reg)->data && !(reg)->data->numRects) +/* not a region */ +#define PIXREGION_NAR(reg) ((reg)->data == pixman_broken_data) +#define PIXREGION_NUMRECTS(reg) ((reg)->data ? (reg)->data->numRects : 1) +#define PIXREGION_SIZE(reg) ((reg)->data ? (reg)->data->size : 0) +#define PIXREGION_RECTS(reg) \ + ((reg)->data ? (box_type_t *)((reg)->data + 1) \ + : &(reg)->extents) +#define PIXREGION_BOXPTR(reg) ((box_type_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 GOOD_RECT(rect) ((rect)->x1 < (rect)->x2 && (rect)->y1 < (rect)->y2) +#define BAD_RECT(rect) ((rect)->x1 > (rect)->x2 || (rect)->y1 > (rect)->y2) + +#ifdef DEBUG + +#define GOOD(reg) \ + do \ + { \ + if (!PREFIX (_selfcheck (reg))) \ + _pixman_log_error (FUNC, "Malformed region " # reg); \ + } while (0) + +#else + +#define GOOD(reg) + +#endif + +static const box_type_t PREFIX (_empty_box_) = { 0, 0, 0, 0 }; +static const region_data_type_t PREFIX (_empty_data_) = { 0, 0 }; +#if defined (__llvm__) && !defined (__clang__) +static const volatile region_data_type_t PREFIX (_broken_data_) = { 0, 0 }; +#else +static const region_data_type_t PREFIX (_broken_data_) = { 0, 0 }; +#endif + +static box_type_t *pixman_region_empty_box = + (box_type_t *)&PREFIX (_empty_box_); +static region_data_type_t *pixman_region_empty_data = + (region_data_type_t *)&PREFIX (_empty_data_); +static region_data_type_t *pixman_broken_data = + (region_data_type_t *)&PREFIX (_broken_data_); + +static pixman_bool_t +pixman_break (region_type_t *region); + +/* + * 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 pixman_region_validate in order to support several speed improvements + * to pixman_region_validate_tree. 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. + * Soren Sandmann did even more 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) ) + +static size_t +PIXREGION_SZOF (size_t n) +{ + size_t size = n * sizeof(box_type_t); + + if (n > UINT32_MAX / sizeof(box_type_t)) + return 0; + + if (sizeof(region_data_type_t) > UINT32_MAX - size) + return 0; + + return size + sizeof(region_data_type_t); +} + +static region_data_type_t * +alloc_data (size_t n) +{ + size_t sz = PIXREGION_SZOF (n); + + if (!sz) + return NULL; + + return malloc (sz); +} + +#define FREE_DATA(reg) if ((reg)->data && (reg)->data->size) free ((reg)->data) + +#define RECTALLOC_BAIL(region, n, bail) \ + do \ + { \ + if (!(region)->data || \ + (((region)->data->numRects + (n)) > (region)->data->size)) \ + { \ + if (!pixman_rect_alloc (region, n)) \ + goto bail; \ + } \ + } while (0) + +#define RECTALLOC(region, n) \ + do \ + { \ + if (!(region)->data || \ + (((region)->data->numRects + (n)) > (region)->data->size)) \ + { \ + if (!pixman_rect_alloc (region, n)) { \ + return FALSE; \ + } \ + } \ + } while (0) + +#define ADDRECT(next_rect, nx1, ny1, nx2, ny2) \ + do \ + { \ + next_rect->x1 = nx1; \ + next_rect->y1 = ny1; \ + next_rect->x2 = nx2; \ + next_rect->y2 = ny2; \ + next_rect++; \ + } \ + while (0) + +#define NEWRECT(region, next_rect, nx1, ny1, nx2, ny2) \ + do \ + { \ + if (!(region)->data || \ + ((region)->data->numRects == (region)->data->size)) \ + { \ + if (!pixman_rect_alloc (region, 1)) \ + return FALSE; \ + next_rect = PIXREGION_TOP (region); \ + } \ + ADDRECT (next_rect, nx1, ny1, nx2, ny2); \ + region->data->numRects++; \ + critical_if_fail (region->data->numRects <= region->data->size); \ + } while (0) + +#define DOWNSIZE(reg, numRects) \ + do \ + { \ + if (((numRects) < ((reg)->data->size >> 1)) && \ + ((reg)->data->size > 50)) \ + { \ + region_data_type_t * new_data; \ + size_t data_size = PIXREGION_SZOF (numRects); \ + \ + if (!data_size) \ + { \ + new_data = NULL; \ + } \ + else \ + { \ + new_data = (region_data_type_t *) \ + realloc ((reg)->data, data_size); \ + } \ + \ + if (new_data) \ + { \ + new_data->size = (numRects); \ + (reg)->data = new_data; \ + } \ + } \ + } while (0) + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_equal) (region_type_t *reg1, region_type_t *reg2) +{ + int i; + box_type_t *rects1; + box_type_t *rects2; + + if (reg1->extents.x1 != reg2->extents.x1) + return FALSE; + + if (reg1->extents.x2 != reg2->extents.x2) + return FALSE; + + if (reg1->extents.y1 != reg2->extents.y1) + return FALSE; + + if (reg1->extents.y2 != reg2->extents.y2) + return FALSE; + + if (PIXREGION_NUMRECTS (reg1) != PIXREGION_NUMRECTS (reg2)) + return FALSE; + + rects1 = PIXREGION_RECTS (reg1); + rects2 = PIXREGION_RECTS (reg2); + + for (i = 0; i != PIXREGION_NUMRECTS (reg1); i++) + { + if (rects1[i].x1 != rects2[i].x1) + return FALSE; + + if (rects1[i].x2 != rects2[i].x2) + return FALSE; + + if (rects1[i].y1 != rects2[i].y1) + return FALSE; + + if (rects1[i].y2 != rects2[i].y2) + return FALSE; + } + + return TRUE; +} + +int +PREFIX (_print) (region_type_t *rgn) +{ + int num, size; + int i; + box_type_t * rects; + + num = PIXREGION_NUMRECTS (rgn); + size = PIXREGION_SIZE (rgn); + rects = PIXREGION_RECTS (rgn); + + fprintf (stderr, "num: %d size: %d\n", num, size); + fprintf (stderr, "extents: %d %d %d %d\n", + rgn->extents.x1, + rgn->extents.y1, + rgn->extents.x2, + rgn->extents.y2); + + for (i = 0; i < num; i++) + { + fprintf (stderr, "%d %d %d %d \n", + rects[i].x1, rects[i].y1, rects[i].x2, rects[i].y2); + } + + fprintf (stderr, "\n"); + + return(num); +} + + +PIXMAN_EXPORT void +PREFIX (_init) (region_type_t *region) +{ + region->extents = *pixman_region_empty_box; + region->data = pixman_region_empty_data; +} + +PIXMAN_EXPORT void +PREFIX (_init_rect) (region_type_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; + + if (!GOOD_RECT (®ion->extents)) + { + if (BAD_RECT (®ion->extents)) + _pixman_log_error (FUNC, "Invalid rectangle passed"); + PREFIX (_init) (region); + return; + } + + region->data = NULL; +} + +PIXMAN_EXPORT void +PREFIX (_init_with_extents) (region_type_t *region, box_type_t *extents) +{ + if (!GOOD_RECT (extents)) + { + if (BAD_RECT (extents)) + _pixman_log_error (FUNC, "Invalid rectangle passed"); + PREFIX (_init) (region); + return; + } + region->extents = *extents; + + region->data = NULL; +} + +PIXMAN_EXPORT void +PREFIX (_fini) (region_type_t *region) +{ + GOOD (region); + FREE_DATA (region); +} + +PIXMAN_EXPORT int +PREFIX (_n_rects) (region_type_t *region) +{ + return PIXREGION_NUMRECTS (region); +} + +PIXMAN_EXPORT box_type_t * +PREFIX (_rectangles) (region_type_t *region, + int *n_rects) +{ + if (n_rects) + *n_rects = PIXREGION_NUMRECTS (region); + + return PIXREGION_RECTS (region); +} + +static pixman_bool_t +pixman_break (region_type_t *region) +{ + FREE_DATA (region); + + region->extents = *pixman_region_empty_box; + region->data = pixman_broken_data; + + return FALSE; +} + +static pixman_bool_t +pixman_rect_alloc (region_type_t * region, + int n) +{ + region_data_type_t *data; + + if (!region->data) + { + n++; + region->data = alloc_data (n); + + if (!region->data) + return pixman_break (region); + + region->data->numRects = 1; + *PIXREGION_BOXPTR (region) = region->extents; + } + else if (!region->data->size) + { + region->data = alloc_data (n); + + if (!region->data) + return pixman_break (region); + + region->data->numRects = 0; + } + else + { + size_t data_size; + + if (n == 1) + { + n = region->data->numRects; + if (n > 500) /* XXX pick numbers out of a hat */ + n = 250; + } + + n += region->data->numRects; + data_size = PIXREGION_SZOF (n); + + if (!data_size) + { + data = NULL; + } + else + { + data = (region_data_type_t *) + realloc (region->data, PIXREGION_SZOF (n)); + } + + if (!data) + return pixman_break (region); + + region->data = data; + } + + region->data->size = n; + + return TRUE; +} + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_copy) (region_type_t *dst, region_type_t *src) +{ + GOOD (dst); + GOOD (src); + + if (dst == src) + return TRUE; + + dst->extents = src->extents; + + if (!src->data || !src->data->size) + { + FREE_DATA (dst); + dst->data = src->data; + return TRUE; + } + + if (!dst->data || (dst->data->size < src->data->numRects)) + { + FREE_DATA (dst); + + dst->data = alloc_data (src->data->numRects); + + if (!dst->data) + return pixman_break (dst); + + dst->data->size = src->data->numRects; + } + + dst->data->numRects = src->data->numRects; + + memmove ((char *)PIXREGION_BOXPTR (dst), (char *)PIXREGION_BOXPTR (src), + dst->data->numRects * sizeof(box_type_t)); + + return TRUE; +} + +/*====================================================================== + * Generic Region Operator + *====================================================================*/ + +/*- + *----------------------------------------------------------------------- + * pixman_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 pixman_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. + * + *----------------------------------------------------------------------- + */ +static inline int +pixman_coalesce (region_type_t * region, /* Region to coalesce */ + int prev_start, /* Index of start of previous band */ + int cur_start) /* Index of start of current band */ +{ + box_type_t *prev_box; /* Current box in previous band */ + box_type_t *cur_box; /* 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 = cur_start - prev_start; + critical_if_fail (numRects == region->data->numRects - cur_start); + + if (!numRects) return cur_start; + + /* + * The bands may only be coalesced if the bottom of the previous + * matches the top scanline of the current. + */ + prev_box = PIXREGION_BOX (region, prev_start); + cur_box = PIXREGION_BOX (region, cur_start); + if (prev_box->y2 != cur_box->y1) return cur_start; + + /* + * 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 = cur_box->y2; + + do + { + if ((prev_box->x1 != cur_box->x1) || (prev_box->x2 != cur_box->x2)) + return (cur_start); + + prev_box++; + cur_box++; + 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 = cur_start - prev_start; + region->data->numRects -= numRects; + + do + { + prev_box--; + prev_box->y2 = y2; + numRects--; + } + while (numRects); + + return prev_start; +} + +/* Quicky macro to avoid trivial reject procedure calls to pixman_coalesce */ + +#define COALESCE(new_reg, prev_band, cur_band) \ + do \ + { \ + if (cur_band - prev_band == new_reg->data->numRects - cur_band) \ + prev_band = pixman_coalesce (new_reg, prev_band, cur_band); \ + else \ + prev_band = cur_band; \ + } while (0) + +/*- + *----------------------------------------------------------------------- + * pixman_region_append_non_o -- + * 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. + * + *----------------------------------------------------------------------- + */ +static inline pixman_bool_t +pixman_region_append_non_o (region_type_t * region, + box_type_t * r, + box_type_t * r_end, + int y1, + int y2) +{ + box_type_t *next_rect; + int new_rects; + + new_rects = r_end - r; + + critical_if_fail (y1 < y2); + critical_if_fail (new_rects != 0); + + /* Make sure we have enough space for all rectangles to be added */ + RECTALLOC (region, new_rects); + next_rect = PIXREGION_TOP (region); + region->data->numRects += new_rects; + + do + { + critical_if_fail (r->x1 < r->x2); + ADDRECT (next_rect, r->x1, y1, r->x2, y2); + r++; + } + while (r != r_end); + + return TRUE; +} + +#define FIND_BAND(r, r_band_end, r_end, ry1) \ + do \ + { \ + ry1 = r->y1; \ + r_band_end = r + 1; \ + while ((r_band_end != r_end) && (r_band_end->y1 == ry1)) { \ + r_band_end++; \ + } \ + } while (0) + +#define APPEND_REGIONS(new_reg, r, r_end) \ + do \ + { \ + int new_rects; \ + if ((new_rects = r_end - r)) { \ + RECTALLOC_BAIL (new_reg, new_rects, bail); \ + memmove ((char *)PIXREGION_TOP (new_reg), (char *)r, \ + new_rects * sizeof(box_type_t)); \ + new_reg->data->numRects += new_rects; \ + } \ + } while (0) + +/*- + *----------------------------------------------------------------------- + * pixman_op -- + * Apply an operation to two regions. Called by pixman_region_union, pixman_region_inverse, + * pixman_region_subtract, pixman_region_intersect.... 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. + * overlap set to TRUE if overlap_func 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 non_overlap_func is called with + * each the band and the band's upper and lower extents. For the + * second, the overlap_func 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 pixman_bool_t (*overlap_proc_ptr) (region_type_t *region, + box_type_t * r1, + box_type_t * r1_end, + box_type_t * r2, + box_type_t * r2_end, + int y1, + int y2); + +static pixman_bool_t +pixman_op (region_type_t * new_reg, /* Place to store result */ + region_type_t * reg1, /* First region in operation */ + region_type_t * reg2, /* 2d region in operation */ + overlap_proc_ptr overlap_func, /* Function to call for over- + * lapping bands */ + int append_non1, /* Append non-overlapping bands + * in region 1 ? + */ + int append_non2 /* Append non-overlapping bands + * in region 2 ? + */ + ) +{ + box_type_t *r1; /* Pointer into first region */ + box_type_t *r2; /* Pointer into 2d region */ + box_type_t *r1_end; /* End of 1st region */ + box_type_t *r2_end; /* End of 2d region */ + int ybot; /* Bottom of intersection */ + int ytop; /* Top of intersection */ + region_data_type_t *old_data; /* Old data for new_reg */ + int prev_band; /* Index of start of + * previous band in new_reg */ + int cur_band; /* Index of start of current + * band in new_reg */ + box_type_t * r1_band_end; /* End of current band in r1 */ + box_type_t * r2_band_end; /* End of current band in r2 */ + int top; /* Top of non-overlapping band */ + int bot; /* Bottom of non-overlapping band*/ + int r1y1; /* Temps for r1->y1 and r2->y1 */ + int r2y1; + int new_size; + int numRects; + + /* + * Break any region computed from a broken region + */ + if (PIXREGION_NAR (reg1) || PIXREGION_NAR (reg2)) + return pixman_break (new_reg); + + /* + * Initialization: + * set r1, r2, r1_end and r2_end 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); + new_size = PIXREGION_NUMRECTS (reg1); + r1_end = r1 + new_size; + + numRects = PIXREGION_NUMRECTS (reg2); + r2 = PIXREGION_RECTS (reg2); + r2_end = r2 + numRects; + + critical_if_fail (r1 != r1_end); + critical_if_fail (r2 != r2_end); + + old_data = (region_data_type_t *)NULL; + + if (((new_reg == reg1) && (new_size > 1)) || + ((new_reg == reg2) && (numRects > 1))) + { + old_data = new_reg->data; + new_reg->data = pixman_region_empty_data; + } + + /* guess at new size */ + if (numRects > new_size) + new_size = numRects; + + new_size <<= 1; + + if (!new_reg->data) + new_reg->data = pixman_region_empty_data; + else if (new_reg->data->size) + new_reg->data->numRects = 0; + + if (new_size > new_reg->data->size) + { + if (!pixman_rect_alloc (new_reg, new_size)) + { + free (old_data); + 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); + + /* + * prev_band serves to mark the start of the previous band so rectangles + * can be coalesced into larger rectangles. qv. pixman_coalesce, above. + * In the beginning, there is no previous band, so prev_band == cur_band + * (cur_band is set later on, of course, but the first band will always + * start at index 0). prev_band and cur_band must be indices because of + * the possible expansion, and resultant moving, of the new region's + * array of rectangles. + */ + prev_band = 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. r1_band_end and r2_band_end serve to mark the + * rectangle after the last one in the current band for their + * respective regions. + */ + critical_if_fail (r1 != r1_end); + critical_if_fail (r2 != r2_end); + + FIND_BAND (r1, r1_band_end, r1_end, r1y1); + FIND_BAND (r2, r2_band_end, r2_end, 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 (append_non1) + { + top = MAX (r1y1, ybot); + bot = MIN (r1->y2, r2y1); + if (top != bot) + { + cur_band = new_reg->data->numRects; + if (!pixman_region_append_non_o (new_reg, r1, r1_band_end, top, bot)) + goto bail; + COALESCE (new_reg, prev_band, cur_band); + } + } + ytop = r2y1; + } + else if (r2y1 < r1y1) + { + if (append_non2) + { + top = MAX (r2y1, ybot); + bot = MIN (r2->y2, r1y1); + + if (top != bot) + { + cur_band = new_reg->data->numRects; + + if (!pixman_region_append_non_o (new_reg, r2, r2_band_end, top, bot)) + goto bail; + + COALESCE (new_reg, prev_band, cur_band); + } + } + 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) + { + cur_band = new_reg->data->numRects; + + if (!(*overlap_func)(new_reg, + r1, r1_band_end, + r2, r2_band_end, + ytop, ybot)) + { + goto bail; + } + + COALESCE (new_reg, prev_band, cur_band); + } + + /* + * If we've finished with a band (y2 == ybot) we skip forward + * in the region to the next band. + */ + if (r1->y2 == ybot) + r1 = r1_band_end; + + if (r2->y2 == ybot) + r2 = r2_band_end; + + } + while (r1 != r1_end && r2 != r2_end); + + /* + * 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 != r1_end) && append_non1) + { + /* Do first non_overlap1Func call, which may be able to coalesce */ + FIND_BAND (r1, r1_band_end, r1_end, r1y1); + + cur_band = new_reg->data->numRects; + + if (!pixman_region_append_non_o (new_reg, + r1, r1_band_end, + MAX (r1y1, ybot), r1->y2)) + { + goto bail; + } + + COALESCE (new_reg, prev_band, cur_band); + + /* Just append the rest of the boxes */ + APPEND_REGIONS (new_reg, r1_band_end, r1_end); + } + else if ((r2 != r2_end) && append_non2) + { + /* Do first non_overlap2Func call, which may be able to coalesce */ + FIND_BAND (r2, r2_band_end, r2_end, r2y1); + + cur_band = new_reg->data->numRects; + + if (!pixman_region_append_non_o (new_reg, + r2, r2_band_end, + MAX (r2y1, ybot), r2->y2)) + { + goto bail; + } + + COALESCE (new_reg, prev_band, cur_band); + + /* Append rest of boxes */ + APPEND_REGIONS (new_reg, r2_band_end, r2_end); + } + + free (old_data); + + if (!(numRects = new_reg->data->numRects)) + { + FREE_DATA (new_reg); + new_reg->data = pixman_region_empty_data; + } + else if (numRects == 1) + { + new_reg->extents = *PIXREGION_BOXPTR (new_reg); + FREE_DATA (new_reg); + new_reg->data = (region_data_type_t *)NULL; + } + else + { + DOWNSIZE (new_reg, numRects); + } + + return TRUE; + +bail: + free (old_data); + + return pixman_break (new_reg); +} + +/*- + *----------------------------------------------------------------------- + * pixman_set_extents -- + * Reset the extents of a region to what they should be. Called by + * pixman_region_subtract and pixman_region_intersect as they can't + * figure it out along the way or do so easily, as pixman_region_union can. + * + * Results: + * None. + * + * Side Effects: + * The region's 'extents' structure is overwritten. + * + *----------------------------------------------------------------------- + */ +static void +pixman_set_extents (region_type_t *region) +{ + box_type_t *box, *box_end; + + 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); + box_end = PIXREGION_END (region); + + /* + * Since box is the first rectangle in the region, it must have the + * smallest y1 and since box_end is the last rectangle in the region, + * it must have the largest y2, because of banding. Initialize x1 and + * x2 from box and box_end, resp., as good things to initialize them + * to... + */ + region->extents.x1 = box->x1; + region->extents.y1 = box->y1; + region->extents.x2 = box_end->x2; + region->extents.y2 = box_end->y2; + + critical_if_fail (region->extents.y1 < region->extents.y2); + + while (box <= box_end) + { + if (box->x1 < region->extents.x1) + region->extents.x1 = box->x1; + if (box->x2 > region->extents.x2) + region->extents.x2 = box->x2; + box++; + } + + critical_if_fail (region->extents.x1 < region->extents.x2); +} + +/*====================================================================== + * Region Intersection + *====================================================================*/ +/*- + *----------------------------------------------------------------------- + * pixman_region_intersect_o -- + * Handle an overlapping band for pixman_region_intersect. + * + * Results: + * TRUE if successful. + * + * Side Effects: + * Rectangles may be added to the region. + * + *----------------------------------------------------------------------- + */ +/*ARGSUSED*/ +static pixman_bool_t +pixman_region_intersect_o (region_type_t *region, + box_type_t * r1, + box_type_t * r1_end, + box_type_t * r2, + box_type_t * r2_end, + int y1, + int y2) +{ + int x1; + int x2; + box_type_t * next_rect; + + next_rect = PIXREGION_TOP (region); + + critical_if_fail (y1 < y2); + critical_if_fail (r1 != r1_end && r2 != r2_end); + + do + { + x1 = MAX (r1->x1, r2->x1); + x2 = 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, next_rect, 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 != r1_end) && (r2 != r2_end)); + + return TRUE; +} + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_intersect) (region_type_t * new_reg, + region_type_t * reg1, + region_type_t * reg2) +{ + GOOD (reg1); + GOOD (reg2); + GOOD (new_reg); + + /* check for trivial reject */ + if (PIXREGION_NIL (reg1) || PIXREGION_NIL (reg2) || + !EXTENTCHECK (®1->extents, ®2->extents)) + { + /* Covers about 20% of all cases */ + FREE_DATA (new_reg); + new_reg->extents.x2 = new_reg->extents.x1; + new_reg->extents.y2 = new_reg->extents.y1; + if (PIXREGION_NAR (reg1) || PIXREGION_NAR (reg2)) + { + new_reg->data = pixman_broken_data; + return FALSE; + } + else + { + new_reg->data = pixman_region_empty_data; + } + } + else if (!reg1->data && !reg2->data) + { + /* Covers about 80% of cases that aren't trivially rejected */ + new_reg->extents.x1 = MAX (reg1->extents.x1, reg2->extents.x1); + new_reg->extents.y1 = MAX (reg1->extents.y1, reg2->extents.y1); + new_reg->extents.x2 = MIN (reg1->extents.x2, reg2->extents.x2); + new_reg->extents.y2 = MIN (reg1->extents.y2, reg2->extents.y2); + + FREE_DATA (new_reg); + + new_reg->data = (region_data_type_t *)NULL; + } + else if (!reg2->data && SUBSUMES (®2->extents, ®1->extents)) + { + return PREFIX (_copy) (new_reg, reg1); + } + else if (!reg1->data && SUBSUMES (®1->extents, ®2->extents)) + { + return PREFIX (_copy) (new_reg, reg2); + } + else if (reg1 == reg2) + { + return PREFIX (_copy) (new_reg, reg1); + } + else + { + /* General purpose intersection */ + + if (!pixman_op (new_reg, reg1, reg2, pixman_region_intersect_o, FALSE, FALSE)) + return FALSE; + + pixman_set_extents (new_reg); + } + + GOOD (new_reg); + return(TRUE); +} + +#define MERGERECT(r) \ + do \ + { \ + if (r->x1 <= x2) \ + { \ + /* Merge with current rectangle */ \ + if (x2 < r->x2) \ + x2 = r->x2; \ + } \ + else \ + { \ + /* Add current rectangle, start new one */ \ + NEWRECT (region, next_rect, x1, y1, x2, y2); \ + x1 = r->x1; \ + x2 = r->x2; \ + } \ + r++; \ + } while (0) + +/*====================================================================== + * Region Union + *====================================================================*/ + +/*- + *----------------------------------------------------------------------- + * pixman_region_union_o -- + * 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: + * region is overwritten. + * overlap is set to TRUE if any boxes overlap. + * + *----------------------------------------------------------------------- + */ +static pixman_bool_t +pixman_region_union_o (region_type_t *region, + box_type_t * r1, + box_type_t * r1_end, + box_type_t * r2, + box_type_t * r2_end, + int y1, + int y2) +{ + box_type_t *next_rect; + int x1; /* left and right side of current union */ + int x2; + + critical_if_fail (y1 < y2); + critical_if_fail (r1 != r1_end && r2 != r2_end); + + next_rect = 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 != r1_end && r2 != r2_end) + { + if (r1->x1 < r2->x1) + MERGERECT (r1); + else + MERGERECT (r2); + } + + /* Finish off whoever (if any) is left */ + if (r1 != r1_end) + { + do + { + MERGERECT (r1); + } + while (r1 != r1_end); + } + else if (r2 != r2_end) + { + do + { + MERGERECT (r2); + } + while (r2 != r2_end); + } + + /* Add current rectangle */ + NEWRECT (region, next_rect, x1, y1, x2, y2); + + return TRUE; +} + +PIXMAN_EXPORT pixman_bool_t +PREFIX(_intersect_rect) (region_type_t *dest, + region_type_t *source, + int x, int y, + unsigned int width, + unsigned int height) +{ + region_type_t region; + + region.data = NULL; + region.extents.x1 = x; + region.extents.y1 = y; + region.extents.x2 = x + width; + region.extents.y2 = y + height; + + return PREFIX(_intersect) (dest, source, ®ion); +} + +/* Convenience function for performing union of region with a + * single rectangle + */ +PIXMAN_EXPORT pixman_bool_t +PREFIX (_union_rect) (region_type_t *dest, + region_type_t *source, + int x, + int y, + unsigned int width, + unsigned int height) +{ + region_type_t region; + + region.extents.x1 = x; + region.extents.y1 = y; + region.extents.x2 = x + width; + region.extents.y2 = y + height; + + if (!GOOD_RECT (®ion.extents)) + { + if (BAD_RECT (®ion.extents)) + _pixman_log_error (FUNC, "Invalid rectangle passed"); + return PREFIX (_copy) (dest, source); + } + + region.data = NULL; + + return PREFIX (_union) (dest, source, ®ion); +} + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_union) (region_type_t *new_reg, + region_type_t *reg1, + region_type_t *reg2) +{ + /* Return TRUE if some overlap + * between reg1, reg2 + */ + GOOD (reg1); + GOOD (reg2); + GOOD (new_reg); + + /* checks all the simple cases */ + + /* + * Region 1 and 2 are the same + */ + if (reg1 == reg2) + return PREFIX (_copy) (new_reg, reg1); + + /* + * Region 1 is empty + */ + if (PIXREGION_NIL (reg1)) + { + if (PIXREGION_NAR (reg1)) + return pixman_break (new_reg); + + if (new_reg != reg2) + return PREFIX (_copy) (new_reg, reg2); + + return TRUE; + } + + /* + * Region 2 is empty + */ + if (PIXREGION_NIL (reg2)) + { + if (PIXREGION_NAR (reg2)) + return pixman_break (new_reg); + + if (new_reg != reg1) + return PREFIX (_copy) (new_reg, reg1); + + return TRUE; + } + + /* + * Region 1 completely subsumes region 2 + */ + if (!reg1->data && SUBSUMES (®1->extents, ®2->extents)) + { + if (new_reg != reg1) + return PREFIX (_copy) (new_reg, reg1); + + return TRUE; + } + + /* + * Region 2 completely subsumes region 1 + */ + if (!reg2->data && SUBSUMES (®2->extents, ®1->extents)) + { + if (new_reg != reg2) + return PREFIX (_copy) (new_reg, reg2); + + return TRUE; + } + + if (!pixman_op (new_reg, reg1, reg2, pixman_region_union_o, TRUE, TRUE)) + return FALSE; + + new_reg->extents.x1 = MIN (reg1->extents.x1, reg2->extents.x1); + new_reg->extents.y1 = MIN (reg1->extents.y1, reg2->extents.y1); + new_reg->extents.x2 = MAX (reg1->extents.x2, reg2->extents.x2); + new_reg->extents.y2 = MAX (reg1->extents.y2, reg2->extents.y2); + + GOOD (new_reg); + + return TRUE; +} + +/*====================================================================== + * Batch Rectangle Union + *====================================================================*/ + +#define EXCHANGE_RECTS(a, b) \ + { \ + box_type_t t; \ + t = rects[a]; \ + rects[a] = rects[b]; \ + rects[b] = t; \ + } + +static void +quick_sort_rects ( + box_type_t rects[], + int numRects) +{ + int y1; + int x1; + int i, j; + box_type_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)) + { + EXCHANGE_RECTS (0, 1); + } + + return; + } + + /* Choose partition element, stick in location 0 */ + EXCHANGE_RECTS (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) + EXCHANGE_RECTS (i, j); + } + while (i < j); + + /* Move partition element back to middle */ + EXCHANGE_RECTS (0, j); + + /* Recurse */ + if (numRects - j - 1 > 1) + quick_sort_rects (&rects[j + 1], numRects - j - 1); + + numRects = j; + } + while (numRects > 1); +} + +/*- + *----------------------------------------------------------------------- + * pixman_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: + * TRUE if successful. + * + * Side Effects: + * The passed-in ``region'' may be modified. + * overlap 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 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 + * pixman_region_union. Maximize the work each pixman_region_union call does by using + * a binary merge. + * + *----------------------------------------------------------------------- + */ + +static pixman_bool_t +validate (region_type_t * badreg) +{ + /* Descriptor for regions under construction in Step 2. */ + typedef struct + { + region_type_t reg; + int prev_band; + int cur_band; + } region_info_t; + + region_info_t stack_regions[64]; + + int numRects; /* Original numRects for badreg */ + region_info_t *ri; /* Array of current regions */ + int num_ri; /* Number of entries used in ri */ + int size_ri; /* Number of entries available in ri */ + int i; /* Index into rects */ + int j; /* Index into ri */ + region_info_t *rit; /* &ri[j] */ + region_type_t *reg; /* ri[j].reg */ + box_type_t *box; /* Current box in rects */ + box_type_t *ri_box; /* Last box in ri[j].reg */ + region_type_t *hreg; /* ri[j_half].reg */ + pixman_bool_t ret = TRUE; + + if (!badreg->data) + { + GOOD (badreg); + return TRUE; + } + + numRects = badreg->data->numRects; + if (!numRects) + { + if (PIXREGION_NAR (badreg)) + return FALSE; + GOOD (badreg); + return TRUE; + } + + if (badreg->extents.x1 < badreg->extents.x2) + { + if ((numRects) == 1) + { + FREE_DATA (badreg); + badreg->data = (region_data_type_t *) NULL; + } + else + { + DOWNSIZE (badreg, numRects); + } + + GOOD (badreg); + + return TRUE; + } + + /* Step 1: Sort the rects array into ascending (y1, x1) order */ + quick_sort_rects (PIXREGION_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 = stack_regions; + size_ri = sizeof (stack_regions) / sizeof (stack_regions[0]); + num_ri = 1; + ri[0].prev_band = 0; + ri[0].cur_band = 0; + ri[0].reg = *badreg; + box = PIXREGION_BOXPTR (&ri[0].reg); + ri[0].reg.extents = *box; + ri[0].reg.data->numRects = 1; + badreg->extents = *pixman_region_empty_box; + badreg->data = pixman_region_empty_data; + + /* 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 = num_ri, rit = ri; --j >= 0; rit++) + { + reg = &rit->reg; + ri_box = PIXREGION_END (reg); + + if (box->y1 == ri_box->y1 && box->y2 == ri_box->y2) + { + /* box is in same band as ri_box. Merge or append it */ + if (box->x1 <= ri_box->x2) + { + /* Merge it with ri_box */ + if (box->x2 > ri_box->x2) + ri_box->x2 = box->x2; + } + else + { + RECTALLOC_BAIL (reg, 1, bail); + *PIXREGION_TOP (reg) = *box; + reg->data->numRects++; + } + + goto next_rect; /* So sue me */ + } + else if (box->y1 >= ri_box->y2) + { + /* Put box into new band */ + if (reg->extents.x2 < ri_box->x2) + reg->extents.x2 = ri_box->x2; + + if (reg->extents.x1 > box->x1) + reg->extents.x1 = box->x1; + + COALESCE (reg, rit->prev_band, rit->cur_band); + rit->cur_band = reg->data->numRects; + RECTALLOC_BAIL (reg, 1, bail); + *PIXREGION_TOP (reg) = *box; + reg->data->numRects++; + + goto next_rect; + } + /* Well, this region was inappropriate. Try the next one. */ + } /* for j */ + + /* Uh-oh. No regions were appropriate. Create a new one. */ + if (size_ri == num_ri) + { + size_t data_size; + + /* Oops, allocate space for new region information */ + size_ri <<= 1; + + data_size = size_ri * sizeof(region_info_t); + if (data_size / size_ri != sizeof(region_info_t)) + goto bail; + + if (ri == stack_regions) + { + rit = malloc (data_size); + if (!rit) + goto bail; + memcpy (rit, ri, num_ri * sizeof (region_info_t)); + } + else + { + rit = (region_info_t *) realloc (ri, data_size); + if (!rit) + goto bail; + } + ri = rit; + rit = &ri[num_ri]; + } + num_ri++; + rit->prev_band = 0; + rit->cur_band = 0; + rit->reg.extents = *box; + rit->reg.data = (region_data_type_t *)NULL; + + /* MUST force allocation */ + if (!pixman_rect_alloc (&rit->reg, (i + num_ri) / num_ri)) + goto bail; + + next_rect: ; + } /* for i */ + + /* Make a final pass over each region in order to COALESCE and set + * extents.x2 and extents.y2 + */ + for (j = num_ri, rit = ri; --j >= 0; rit++) + { + reg = &rit->reg; + ri_box = PIXREGION_END (reg); + reg->extents.y2 = ri_box->y2; + + if (reg->extents.x2 < ri_box->x2) + reg->extents.x2 = ri_box->x2; + + COALESCE (reg, rit->prev_band, rit->cur_band); + + if (reg->data->numRects == 1) /* keep unions happy below */ + { + FREE_DATA (reg); + reg->data = (region_data_type_t *)NULL; + } + } + + /* Step 3: Union all regions into a single region */ + while (num_ri > 1) + { + int half = num_ri / 2; + for (j = num_ri & 1; j < (half + (num_ri & 1)); j++) + { + reg = &ri[j].reg; + hreg = &ri[j + half].reg; + + if (!pixman_op (reg, reg, hreg, pixman_region_union_o, TRUE, TRUE)) + 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; + + FREE_DATA (hreg); + } + + num_ri -= half; + + if (!ret) + goto bail; + } + + *badreg = ri[0].reg; + + if (ri != stack_regions) + free (ri); + + GOOD (badreg); + return ret; + +bail: + for (i = 0; i < num_ri; i++) + FREE_DATA (&ri[i].reg); + + if (ri != stack_regions) + free (ri); + + return pixman_break (badreg); +} + +/*====================================================================== + * Region Subtraction + *====================================================================*/ + +/*- + *----------------------------------------------------------------------- + * pixman_region_subtract_o -- + * Overlapping band subtraction. x1 is the left-most point not yet + * checked. + * + * Results: + * TRUE if successful. + * + * Side Effects: + * region may have rectangles added to it. + * + *----------------------------------------------------------------------- + */ +/*ARGSUSED*/ +static pixman_bool_t +pixman_region_subtract_o (region_type_t * region, + box_type_t * r1, + box_type_t * r1_end, + box_type_t * r2, + box_type_t * r2_end, + int y1, + int y2) +{ + box_type_t * next_rect; + int x1; + + x1 = r1->x1; + + critical_if_fail (y1 < y2); + critical_if_fail (r1 != r1_end && r2 != r2_end); + + next_rect = 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 precedes 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 minuend. + */ + r1++; + if (r1 != r1_end) + 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. + */ + critical_if_fail (x1 < r2->x1); + NEWRECT (region, next_rect, x1, y1, r2->x1, y2); + + x1 = r2->x2; + if (x1 >= r1->x2) + { + /* + * Minuend used up: advance to new... + */ + r1++; + if (r1 != r1_end) + x1 = r1->x1; + } + else + { + /* + * Subtrahend used up + */ + r2++; + } + } + else + { + /* + * Minuend used up: add any remaining piece before advancing. + */ + if (r1->x2 > x1) + NEWRECT (region, next_rect, x1, y1, r1->x2, y2); + + r1++; + + if (r1 != r1_end) + x1 = r1->x1; + } + } + while ((r1 != r1_end) && (r2 != r2_end)); + + /* + * Add remaining minuend rectangles to region. + */ + while (r1 != r1_end) + { + critical_if_fail (x1 < r1->x2); + + NEWRECT (region, next_rect, x1, y1, r1->x2, y2); + + r1++; + if (r1 != r1_end) + x1 = r1->x1; + } + return TRUE; +} + +/*- + *----------------------------------------------------------------------- + * pixman_region_subtract -- + * Subtract reg_s from reg_m and leave the result in reg_d. + * S stands for subtrahend, M for minuend and D for difference. + * + * Results: + * TRUE if successful. + * + * Side Effects: + * reg_d is overwritten. + * + *----------------------------------------------------------------------- + */ +PIXMAN_EXPORT pixman_bool_t +PREFIX (_subtract) (region_type_t *reg_d, + region_type_t *reg_m, + region_type_t *reg_s) +{ + GOOD (reg_m); + GOOD (reg_s); + GOOD (reg_d); + + /* check for trivial rejects */ + if (PIXREGION_NIL (reg_m) || PIXREGION_NIL (reg_s) || + !EXTENTCHECK (®_m->extents, ®_s->extents)) + { + if (PIXREGION_NAR (reg_s)) + return pixman_break (reg_d); + + return PREFIX (_copy) (reg_d, reg_m); + } + else if (reg_m == reg_s) + { + FREE_DATA (reg_d); + reg_d->extents.x2 = reg_d->extents.x1; + reg_d->extents.y2 = reg_d->extents.y1; + reg_d->data = pixman_region_empty_data; + + return TRUE; + } + + /* Add those rectangles in region 1 that aren't in region 2, + do yucky subtraction for overlaps, and + just throw away rectangles in region 2 that aren't in region 1 */ + if (!pixman_op (reg_d, reg_m, reg_s, pixman_region_subtract_o, TRUE, FALSE)) + return FALSE; + + /* + * Can't alter reg_d's extents before we call pixman_op because + * it might be one of the source regions and pixman_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 examine fewer rectangles. + */ + pixman_set_extents (reg_d); + GOOD (reg_d); + return TRUE; +} + +/*====================================================================== + * Region Inversion + *====================================================================*/ + +/*- + *----------------------------------------------------------------------- + * pixman_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: + * TRUE. + * + * Side Effects: + * new_reg is overwritten. + * + *----------------------------------------------------------------------- + */ +PIXMAN_EXPORT pixman_bool_t +PREFIX (_inverse) (region_type_t *new_reg, /* Destination region */ + region_type_t *reg1, /* Region to invert */ + box_type_t * inv_rect) /* Bounding box for inversion */ +{ + region_type_t inv_reg; /* Quick and dirty region made from the + * bounding box */ + GOOD (reg1); + GOOD (new_reg); + + /* check for trivial rejects */ + if (PIXREGION_NIL (reg1) || !EXTENTCHECK (inv_rect, ®1->extents)) + { + if (PIXREGION_NAR (reg1)) + return pixman_break (new_reg); + + new_reg->extents = *inv_rect; + FREE_DATA (new_reg); + new_reg->data = (region_data_type_t *)NULL; + + return TRUE; + } + + /* Add those rectangles in region 1 that aren't in region 2, + * do yucky subtraction for overlaps, and + * just throw away rectangles in region 2 that aren't in region 1 + */ + inv_reg.extents = *inv_rect; + inv_reg.data = (region_data_type_t *)NULL; + if (!pixman_op (new_reg, &inv_reg, reg1, pixman_region_subtract_o, TRUE, FALSE)) + return FALSE; + + /* + * Can't alter new_reg's extents before we call pixman_op because + * it might be one of the source regions and pixman_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 examine fewer rectangles. + */ + pixman_set_extents (new_reg); + GOOD (new_reg); + return TRUE; +} + +/* In time O(log n), locate the first box whose y2 is greater than y. + * Return @end if no such box exists. + */ +static box_type_t * +find_box_for_y (box_type_t *begin, box_type_t *end, int y) +{ + box_type_t *mid; + + if (end == begin) + return end; + + if (end - begin == 1) + { + if (begin->y2 > y) + return begin; + else + return end; + } + + mid = begin + (end - begin) / 2; + if (mid->y2 > y) + { + /* If no box is found in [begin, mid], the function + * will return @mid, which is then known to be the + * correct answer. + */ + return find_box_for_y (begin, mid, y); + } + else + { + return find_box_for_y (mid, end, y); + } +} + +/* + * rect_in(region, rect) + * This routine takes a pointer to a region and a pointer to a box + * and determines 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, part_out is set TRUE. Any time a rectangle in + * the region covers part of the box, part_in is set TRUE. The process ends + * when either the box has been completely covered (we reached a band that + * doesn't overlap the box, part_in is TRUE and part_out is false), the + * box has been partially covered (part_in == part_out == TRUE -- 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 part_in is false) + */ +PIXMAN_EXPORT pixman_region_overlap_t +PREFIX (_contains_rectangle) (region_type_t * region, + box_type_t * prect) +{ + box_type_t * pbox; + box_type_t * pbox_end; + int part_in, part_out; + int numRects; + int x, y; + + GOOD (region); + + numRects = PIXREGION_NUMRECTS (region); + + /* useful optimization */ + if (!numRects || !EXTENTCHECK (®ion->extents, prect)) + return(PIXMAN_REGION_OUT); + + if (numRects == 1) + { + /* We know that it must be PIXMAN_REGION_IN or PIXMAN_REGION_PART */ + if (SUBSUMES (®ion->extents, prect)) + return(PIXMAN_REGION_IN); + else + return(PIXMAN_REGION_PART); + } + + part_out = FALSE; + part_in = FALSE; + + /* (x,y) starts at upper left of rect, moving to the right and down */ + x = prect->x1; + y = prect->y1; + + /* can stop when both part_out and part_in are TRUE, or we reach prect->y2 */ + for (pbox = PIXREGION_BOXPTR (region), pbox_end = pbox + numRects; + pbox != pbox_end; + pbox++) + { + /* getting up to speed or skipping remainder of band */ + if (pbox->y2 <= y) + { + if ((pbox = find_box_for_y (pbox, pbox_end, y)) == pbox_end) + break; + } + + if (pbox->y1 > y) + { + part_out = TRUE; /* missed part of rectangle above */ + if (part_in || (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) + { + part_out = TRUE; /* missed part of rectangle to left */ + if (part_in) + break; + } + + if (pbox->x1 < prect->x2) + { + part_in = TRUE; /* definitely overlap */ + if (part_out) + 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. part_in will have been set true + * by now... + */ + part_out = TRUE; + break; + } + } + + if (part_in) + { + if (y < prect->y2) + return PIXMAN_REGION_PART; + else + return PIXMAN_REGION_IN; + } + else + { + return PIXMAN_REGION_OUT; + } +} + +/* PREFIX(_translate) (region, x, y) + * translates in place + */ + +PIXMAN_EXPORT void +PREFIX (_translate) (region_type_t *region, int x, int y) +{ + overflow_int_t x1, x2, y1, y2; + int nbox; + box_type_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 - PIXMAN_REGION_MIN) | (y1 - PIXMAN_REGION_MIN) | (PIXMAN_REGION_MAX - x2) | (PIXMAN_REGION_MAX - y2)) >= 0) + { + if (region->data && (nbox = region->data->numRects)) + { + for (pbox = PIXREGION_BOXPTR (region); nbox--; pbox++) + { + pbox->x1 += x; + pbox->y1 += y; + pbox->x2 += x; + pbox->y2 += y; + } + } + return; + } + + if (((x2 - PIXMAN_REGION_MIN) | (y2 - PIXMAN_REGION_MIN) | (PIXMAN_REGION_MAX - x1) | (PIXMAN_REGION_MAX - y1)) <= 0) + { + region->extents.x2 = region->extents.x1; + region->extents.y2 = region->extents.y1; + FREE_DATA (region); + region->data = pixman_region_empty_data; + return; + } + + if (x1 < PIXMAN_REGION_MIN) + region->extents.x1 = PIXMAN_REGION_MIN; + else if (x2 > PIXMAN_REGION_MAX) + region->extents.x2 = PIXMAN_REGION_MAX; + + if (y1 < PIXMAN_REGION_MIN) + region->extents.y1 = PIXMAN_REGION_MIN; + else if (y2 > PIXMAN_REGION_MAX) + region->extents.y2 = PIXMAN_REGION_MAX; + + if (region->data && (nbox = region->data->numRects)) + { + box_type_t * pbox_out; + + for (pbox_out = pbox = PIXREGION_BOXPTR (region); nbox--; pbox++) + { + pbox_out->x1 = x1 = pbox->x1 + x; + pbox_out->y1 = y1 = pbox->y1 + y; + pbox_out->x2 = x2 = pbox->x2 + x; + pbox_out->y2 = y2 = pbox->y2 + y; + + if (((x2 - PIXMAN_REGION_MIN) | (y2 - PIXMAN_REGION_MIN) | + (PIXMAN_REGION_MAX - x1) | (PIXMAN_REGION_MAX - y1)) <= 0) + { + region->data->numRects--; + continue; + } + + if (x1 < PIXMAN_REGION_MIN) + pbox_out->x1 = PIXMAN_REGION_MIN; + else if (x2 > PIXMAN_REGION_MAX) + pbox_out->x2 = PIXMAN_REGION_MAX; + + if (y1 < PIXMAN_REGION_MIN) + pbox_out->y1 = PIXMAN_REGION_MIN; + else if (y2 > PIXMAN_REGION_MAX) + pbox_out->y2 = PIXMAN_REGION_MAX; + + pbox_out++; + } + + if (pbox_out != pbox) + { + if (region->data->numRects == 1) + { + region->extents = *PIXREGION_BOXPTR (region); + FREE_DATA (region); + region->data = (region_data_type_t *)NULL; + } + else + { + pixman_set_extents (region); + } + } + } + + GOOD (region); +} + +PIXMAN_EXPORT void +PREFIX (_reset) (region_type_t *region, box_type_t *box) +{ + GOOD (region); + + critical_if_fail (GOOD_RECT (box)); + + region->extents = *box; + + FREE_DATA (region); + + region->data = NULL; +} + +PIXMAN_EXPORT void +PREFIX (_clear) (region_type_t *region) +{ + GOOD (region); + FREE_DATA (region); + + region->extents = *pixman_region_empty_box; + region->data = pixman_region_empty_data; +} + +/* box is "return" value */ +PIXMAN_EXPORT int +PREFIX (_contains_point) (region_type_t * region, + int x, int y, + box_type_t * box) +{ + box_type_t *pbox, *pbox_end; + int numRects; + + GOOD (region); + numRects = PIXREGION_NUMRECTS (region); + + if (!numRects || !INBOX (®ion->extents, x, y)) + return(FALSE); + + if (numRects == 1) + { + if (box) + *box = region->extents; + + return(TRUE); + } + + pbox = PIXREGION_BOXPTR (region); + pbox_end = pbox + numRects; + + pbox = find_box_for_y (pbox, pbox_end, y); + + for (;pbox != pbox_end; pbox++) + { + if ((y < pbox->y1) || (x < pbox->x1)) + break; /* missed it */ + + if (x >= pbox->x2) + continue; /* not there yet */ + + if (box) + *box = *pbox; + + return(TRUE); + } + + return(FALSE); +} + +PIXMAN_EXPORT int +PREFIX (_not_empty) (region_type_t * region) +{ + GOOD (region); + + return(!PIXREGION_NIL (region)); +} + +PIXMAN_EXPORT box_type_t * +PREFIX (_extents) (region_type_t * region) +{ + GOOD (region); + + return(®ion->extents); +} + +/* + * 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. + */ + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_selfcheck) (region_type_t *reg) +{ + int i, numRects; + + if ((reg->extents.x1 > reg->extents.x2) || + (reg->extents.y1 > reg->extents.y2)) + { + return FALSE; + } + + numRects = PIXREGION_NUMRECTS (reg); + if (!numRects) + { + return ((reg->extents.x1 == reg->extents.x2) && + (reg->extents.y1 == reg->extents.y2) && + (reg->data->size || (reg->data == pixman_region_empty_data))); + } + else if (numRects == 1) + { + return (!reg->data); + } + else + { + box_type_t * pbox_p, * pbox_n; + box_type_t box; + + pbox_p = PIXREGION_RECTS (reg); + box = *pbox_p; + box.y2 = pbox_p[numRects - 1].y2; + pbox_n = pbox_p + 1; + + for (i = numRects; --i > 0; pbox_p++, pbox_n++) + { + if ((pbox_n->x1 >= pbox_n->x2) || + (pbox_n->y1 >= pbox_n->y2)) + { + return FALSE; + } + + if (pbox_n->x1 < box.x1) + box.x1 = pbox_n->x1; + + if (pbox_n->x2 > box.x2) + box.x2 = pbox_n->x2; + + if ((pbox_n->y1 < pbox_p->y1) || + ((pbox_n->y1 == pbox_p->y1) && + ((pbox_n->x1 < pbox_p->x2) || (pbox_n->y2 != pbox_p->y2)))) + { + return FALSE; + } + } + + return ((box.x1 == reg->extents.x1) && + (box.x2 == reg->extents.x2) && + (box.y1 == reg->extents.y1) && + (box.y2 == reg->extents.y2)); + } +} + +PIXMAN_EXPORT pixman_bool_t +PREFIX (_init_rects) (region_type_t *region, + const box_type_t *boxes, int count) +{ + box_type_t *rects; + int displacement; + int i; + + /* if it's 1, then we just want to set the extents, so call + * the existing method. */ + if (count == 1) + { + PREFIX (_init_rect) (region, + boxes[0].x1, + boxes[0].y1, + boxes[0].x2 - boxes[0].x1, + boxes[0].y2 - boxes[0].y1); + return TRUE; + } + + PREFIX (_init) (region); + + /* if it's 0, don't call pixman_rect_alloc -- 0 rectangles is + * a special case, and causing pixman_rect_alloc would cause + * us to leak memory (because the 0-rect case should be the + * static pixman_region_empty_data data). + */ + if (count == 0) + return TRUE; + + if (!pixman_rect_alloc (region, count)) + return FALSE; + + rects = PIXREGION_RECTS (region); + + /* Copy in the rects */ + memcpy (rects, boxes, sizeof(box_type_t) * count); + region->data->numRects = count; + + /* Eliminate empty and malformed rectangles */ + displacement = 0; + + for (i = 0; i < count; ++i) + { + box_type_t *box = &rects[i]; + + if (box->x1 >= box->x2 || box->y1 >= box->y2) + displacement++; + else if (displacement) + rects[i - displacement] = rects[i]; + } + + region->data->numRects -= displacement; + + /* If eliminating empty rectangles caused there + * to be only 0 or 1 rectangles, deal with that. + */ + if (region->data->numRects == 0) + { + FREE_DATA (region); + PREFIX (_init) (region); + + return TRUE; + } + + if (region->data->numRects == 1) + { + region->extents = rects[0]; + + FREE_DATA (region); + region->data = NULL; + + GOOD (region); + + return TRUE; + } + + /* Validate */ + region->extents.x1 = region->extents.x2 = 0; + + return validate (region); +} + +#define READ(_ptr) (*(_ptr)) + +static inline box_type_t * +bitmap_addrect (region_type_t *reg, + box_type_t *r, + box_type_t **first_rect, + int rx1, int ry1, + int rx2, int ry2) +{ + if ((rx1 < rx2) && (ry1 < ry2) && + (!(reg->data->numRects && + ((r-1)->y1 == ry1) && ((r-1)->y2 == ry2) && + ((r-1)->x1 <= rx1) && ((r-1)->x2 >= rx2)))) + { + if (reg->data->numRects == reg->data->size) + { + if (!pixman_rect_alloc (reg, 1)) + return NULL; + *first_rect = PIXREGION_BOXPTR(reg); + r = *first_rect + reg->data->numRects; + } + r->x1 = rx1; + r->y1 = ry1; + r->x2 = rx2; + r->y2 = ry2; + reg->data->numRects++; + if (r->x1 < reg->extents.x1) + reg->extents.x1 = r->x1; + if (r->x2 > reg->extents.x2) + reg->extents.x2 = r->x2; + r++; + } + return r; +} + +/* Convert bitmap clip mask into clipping region. + * First, goes through each line and makes boxes by noting the transitions + * from 0 to 1 and 1 to 0. + * Then it coalesces the current line with the previous if they have boxes + * at the same X coordinates. + * Stride is in number of uint32_t per line. + */ +PIXMAN_EXPORT void +PREFIX (_init_from_image) (region_type_t *region, + pixman_image_t *image) +{ + uint32_t mask0 = 0xffffffff & ~SCREEN_SHIFT_RIGHT(0xffffffff, 1); + box_type_t *first_rect, *rects, *prect_line_start; + box_type_t *old_rect, *new_rect; + uint32_t *pw, w, *pw_line, *pw_line_end; + int irect_prev_start, irect_line_start; + int h, base, rx1 = 0, crects; + int ib; + pixman_bool_t in_box, same; + int width, height, stride; + + PREFIX(_init) (region); + + critical_if_fail (region->data); + + return_if_fail (image->type == BITS); + return_if_fail (image->bits.format == PIXMAN_a1); + + pw_line = pixman_image_get_data (image); + width = pixman_image_get_width (image); + height = pixman_image_get_height (image); + stride = pixman_image_get_stride (image) / 4; + + first_rect = PIXREGION_BOXPTR(region); + rects = first_rect; + + region->extents.x1 = width - 1; + region->extents.x2 = 0; + irect_prev_start = -1; + for (h = 0; h < height; h++) + { + pw = pw_line; + pw_line += stride; + irect_line_start = rects - first_rect; + + /* If the Screen left most bit of the word is set, we're starting in + * a box */ + if (READ(pw) & mask0) + { + in_box = TRUE; + rx1 = 0; + } + else + { + in_box = FALSE; + } + + /* Process all words which are fully in the pixmap */ + pw_line_end = pw + (width >> 5); + for (base = 0; pw < pw_line_end; base += 32) + { + w = READ(pw++); + if (in_box) + { + if (!~w) + continue; + } + else + { + if (!w) + continue; + } + for (ib = 0; ib < 32; ib++) + { + /* If the Screen left most bit of the word is set, we're + * starting a box */ + if (w & mask0) + { + if (!in_box) + { + rx1 = base + ib; + /* start new box */ + in_box = TRUE; + } + } + else + { + if (in_box) + { + /* end box */ + rects = bitmap_addrect (region, rects, &first_rect, + rx1, h, base + ib, h + 1); + if (rects == NULL) + goto error; + in_box = FALSE; + } + } + /* Shift the word VISUALLY left one. */ + w = SCREEN_SHIFT_LEFT(w, 1); + } + } + + if (width & 31) + { + /* Process final partial word on line */ + w = READ(pw++); + for (ib = 0; ib < (width & 31); ib++) + { + /* If the Screen left most bit of the word is set, we're + * starting a box */ + if (w & mask0) + { + if (!in_box) + { + rx1 = base + ib; + /* start new box */ + in_box = TRUE; + } + } + else + { + if (in_box) + { + /* end box */ + rects = bitmap_addrect(region, rects, &first_rect, + rx1, h, base + ib, h + 1); + if (rects == NULL) + goto error; + in_box = FALSE; + } + } + /* Shift the word VISUALLY left one. */ + w = SCREEN_SHIFT_LEFT(w, 1); + } + } + /* If scanline ended with last bit set, end the box */ + if (in_box) + { + rects = bitmap_addrect(region, rects, &first_rect, + rx1, h, base + (width & 31), h + 1); + if (rects == NULL) + goto error; + } + /* if all rectangles on this line have the same x-coords as + * those on the previous line, then add 1 to all the previous y2s and + * throw away all the rectangles from this line + */ + same = FALSE; + if (irect_prev_start != -1) + { + crects = irect_line_start - irect_prev_start; + if (crects != 0 && + crects == ((rects - first_rect) - irect_line_start)) + { + old_rect = first_rect + irect_prev_start; + new_rect = prect_line_start = first_rect + irect_line_start; + same = TRUE; + while (old_rect < prect_line_start) + { + if ((old_rect->x1 != new_rect->x1) || + (old_rect->x2 != new_rect->x2)) + { + same = FALSE; + break; + } + old_rect++; + new_rect++; + } + if (same) + { + old_rect = first_rect + irect_prev_start; + while (old_rect < prect_line_start) + { + old_rect->y2 += 1; + old_rect++; + } + rects -= crects; + region->data->numRects -= crects; + } + } + } + if(!same) + irect_prev_start = irect_line_start; + } + if (!region->data->numRects) + { + region->extents.x1 = region->extents.x2 = 0; + } + else + { + region->extents.y1 = PIXREGION_BOXPTR(region)->y1; + region->extents.y2 = PIXREGION_END(region)->y2; + if (region->data->numRects == 1) + { + free (region->data); + region->data = NULL; + } + } + + error: + return; +} |