mirror of https://github.com/GNOME/gimp.git
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "display-types.h"
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#include "gimpdisplay-area.h"
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#define OVERHEAD 25 /* in units of pixel area */
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GimpArea *
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gimp_area_new (gint x1,
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gint y1,
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gint x2,
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gint y2)
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{
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GimpArea *area;
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area = g_new (GimpArea, 1);
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area->x1 = x1;
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area->y1 = y1;
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area->x2 = x2;
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area->y2 = y2;
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return area;
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}
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/*
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* As far as I can tell, this function takes a GimpArea and unifies it with
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* an existing list of GimpAreas, trying to avoid overdraw. [adam]
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*/
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GSList *
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gimp_display_area_list_process (GSList *list,
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GimpArea *area)
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{
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GSList *new_list;
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GSList *l;
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gint area1, area2, area3;
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GimpArea *ga2;
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/* start new list off */
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new_list = g_slist_prepend (NULL, area);
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for (l = list; l; l = g_slist_next (l))
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{
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ga2 = (GimpArea *) l->data;
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area1 = (area->x2 - area->x1) * (area->y2 - area->y1) + OVERHEAD;
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area2 = (ga2->x2 - ga2->x1) * (ga2->y2 - ga2->y1) + OVERHEAD;
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area3 = (MAX (ga2->x2, area->x2) - MIN (ga2->x1, area->x1)) *
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(MAX (ga2->y2, area->y2) - MIN (ga2->y1, area->y1)) + OVERHEAD;
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if ((area1 + area2) < area3)
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{
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new_list = g_slist_prepend (new_list, ga2);
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}
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else
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{
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area->x1 = MIN (area->x1, ga2->x1);
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area->y1 = MIN (area->y1, ga2->y1);
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area->x2 = MAX (area->x2, ga2->x2);
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area->y2 = MAX (area->y2, ga2->y2);
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g_free (ga2);
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}
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}
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if (list)
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g_slist_free (list);
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return new_list;
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}
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GSList *
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gimp_display_area_list_free (GSList *list)
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{
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if (list)
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{
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g_slist_foreach (list, (GFunc) g_free, NULL);
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g_slist_free (list);
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}
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return NULL;
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}
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