mirror of https://github.com/GNOME/gimp.git
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* GIMP - The GNU Image Manipulation Program
|
|
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib-object.h>
|
|
|
|
#include "core-types.h"
|
|
|
|
#include "gimparea.h"
|
|
|
|
|
|
#define OVERHEAD 25 /* in units of pixel area */
|
|
|
|
|
|
GimpArea *
|
|
gimp_area_new (gint x1,
|
|
gint y1,
|
|
gint x2,
|
|
gint y2)
|
|
{
|
|
GimpArea *area = g_slice_new (GimpArea);
|
|
|
|
area->x1 = x1;
|
|
area->y1 = y1;
|
|
area->x2 = x2;
|
|
area->y2 = y2;
|
|
|
|
return area;
|
|
}
|
|
|
|
void
|
|
gimp_area_free (GimpArea *area)
|
|
{
|
|
g_slice_free (GimpArea, area);
|
|
}
|
|
|
|
|
|
/*
|
|
* As far as I can tell, this function takes a GimpArea and unifies it with
|
|
* an existing list of GimpAreas, trying to avoid overdraw. [adam]
|
|
*/
|
|
GSList *
|
|
gimp_area_list_process (GSList *list,
|
|
GimpArea *area)
|
|
{
|
|
GSList *new_list;
|
|
GSList *l;
|
|
gint area1, area2, area3;
|
|
|
|
/* start new list off */
|
|
new_list = g_slist_prepend (NULL, area);
|
|
|
|
for (l = list; l; l = g_slist_next (l))
|
|
{
|
|
GimpArea *ga2 = l->data;
|
|
|
|
area1 = (area->x2 - area->x1) * (area->y2 - area->y1) + OVERHEAD;
|
|
area2 = (ga2->x2 - ga2->x1) * (ga2->y2 - ga2->y1) + OVERHEAD;
|
|
area3 = ((MAX (ga2->x2, area->x2) - MIN (ga2->x1, area->x1)) *
|
|
(MAX (ga2->y2, area->y2) - MIN (ga2->y1, area->y1)) + OVERHEAD);
|
|
|
|
if ((area1 + area2) < area3)
|
|
{
|
|
new_list = g_slist_prepend (new_list, ga2);
|
|
}
|
|
else
|
|
{
|
|
area->x1 = MIN (area->x1, ga2->x1);
|
|
area->y1 = MIN (area->y1, ga2->y1);
|
|
area->x2 = MAX (area->x2, ga2->x2);
|
|
area->y2 = MAX (area->y2, ga2->y2);
|
|
|
|
g_slice_free (GimpArea, ga2);
|
|
}
|
|
}
|
|
|
|
if (list)
|
|
g_slist_free (list);
|
|
|
|
return new_list;
|
|
}
|
|
|
|
void
|
|
gimp_area_list_free (GSList *areas)
|
|
{
|
|
GSList *list;
|
|
|
|
for (list = areas; list; list = list->next)
|
|
gimp_area_free (list->data);
|
|
|
|
g_slist_free (list);
|
|
}
|