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/*
* Copyright © 2004 David Reveman
*
* 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
* David Reveman not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
* David Reveman makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* DAVID REVEMAN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL DAVID REVEMAN 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.
*
* Author: David Reveman <davidr@novell.com>
*/
#ifdef HAVE_CONFIG_H
# include "../config.h"
#endif
#include "glitzint.h"
#define GLITZ_REGION_ALLOC_CHUNK 16
#define BOX_SUBSUMS_BOX(b1, b2) \
((b2)->x1 >= (b1)->x1 && \
(b2)->x2 <= (b1)->x2 && \
(b2)->y1 >= (b1)->y1 && \
(b2)->y2 <= (b1)->y2)
#define BOX_INTERSECTS_BOX(b1, b2) \
((b1)->x1 < (b2)->x2 && \
(b1)->x2 > (b2)->x1 && \
(b1)->y1 < (b2)->y2 && \
(b1)->y2 > (b2)->y1)
#define BOX_CLOSE_TO_BOX(b1, b2) \
((b1)->x1 < ((b2)->x2 + 1) && \
(b1)->x2 > ((b2)->x1 - 1) && \
(b1)->y1 < ((b2)->y2 + 1) && \
(b1)->y2 > ((b2)->y1 - 1))
#define BOX_NEXT_TO_BOX(b1, b2) \
((((b1)->x1 == (b2)->x2 || \
(b1)->x2 == (b2)->x1) && \
(b1)->y1 == (b2)->y1 && \
(b1)->y2 == (b2)->y2) || \
(((b1)->y1 == (b2)->y2 || \
(b1)->y2 == (b2)->y1) && \
(b1)->x1 == (b2)->x1 && \
(b1)->x2 == (b2)->x2))
#define MERGE_BOXES(d, b1, b2) \
{ \
(d)->x1 = MIN ((b1)->x1, (b2)->x1); \
(d)->y1 = MIN ((b1)->y1, (b2)->y1); \
(d)->x2 = MAX ((b1)->x2, (b2)->x2); \
(d)->y2 = MAX ((b1)->y2, (b2)->y2); \
}
/*
* No real union, boxes that intersect are just joined into bigger boxes.
* This is OK for our needs and it keeps the number of boxes down to a
* minimum and makes it faster.
*/
glitz_status_t
glitz_region_union (glitz_region_t *region,
glitz_box_t *ubox)
{
if (region->n_box == 0) {
region->extents = *ubox;
region->box = ®ion->extents;
region->n_box = 1;
return GLITZ_STATUS_SUCCESS;
}
if (BOX_CLOSE_TO_BOX (ubox, ®ion->extents)) {
glitz_box_t *box, *new_box, *dst_box;
int n_box;
box = region->box;
n_box = region->n_box;
while (n_box--) {
if (BOX_SUBSUMS_BOX (box, ubox))
return GLITZ_STATUS_SUCCESS;
box++;
}
box = region->box;
n_box = region->n_box;
new_box = ubox;
dst_box = NULL;
while (n_box--) {
if (BOX_INTERSECTS_BOX (box, new_box) ||
BOX_NEXT_TO_BOX (box, new_box)) {
if (dst_box) {
/*
* Remove box from region
*/
region->n_box--;
if (region->n_box == 1) {
MERGE_BOXES (®ion->extents, box, new_box);
region->box = ®ion->extents;
return GLITZ_STATUS_SUCCESS;
} else {
MERGE_BOXES (dst_box, box, new_box);
if (n_box)
memmove (box, box + 1,
n_box * sizeof (glitz_box_t));
}
continue;
} else {
dst_box = box;
MERGE_BOXES (dst_box, box, new_box);
new_box = dst_box;
}
}
box++;
}
if (dst_box) {
if (region->n_box > 1)
MERGE_BOXES (®ion->extents, ®ion->extents, ubox);
return GLITZ_STATUS_SUCCESS;
}
}
/*
* Add box to region
*/
if (region->size < (region->n_box + 1)) {
region->size += GLITZ_REGION_ALLOC_CHUNK;
region->data = (void *) realloc (region->data,
sizeof (glitz_box_t) * region->size);
if (!region->data)
return GLITZ_STATUS_NO_MEMORY;
}
region->box = (glitz_box_t *) region->data;
region->box[region->n_box] = *ubox;
if (region->n_box == 1)
region->box[0] = region->extents;
region->n_box++;
MERGE_BOXES (®ion->extents, ®ion->extents, ubox);
return GLITZ_STATUS_SUCCESS;
}
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