--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff