mirror of https://github.com/GNOME/gimp.git
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "core-types.h"
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#include "gimparea.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 = g_slice_new (GimpArea);
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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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void
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gimp_area_free (GimpArea *area)
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{
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g_slice_free (GimpArea, 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_area_list_process (GSList *list,
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GimpArea *area)
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{
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GSList *retval;
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GSList *l;
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retval = 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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GimpArea *this = l->data;
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gint area1;
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gint area2;
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gint area3;
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area1 = (area->x2 - area->x1) * (area->y2 - area->y1) + OVERHEAD;
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area2 = (this->x2 - this->x1) * (this->y2 - this->y1) + OVERHEAD;
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area3 = ((MAX (this->x2, area->x2) - MIN (this->x1, area->x1)) *
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(MAX (this->y2, area->y2) - MIN (this->y1, area->y1)) + OVERHEAD);
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if (area1 + area2 < area3)
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{
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retval = g_slist_prepend (retval, this);
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}
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else
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{
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area->x1 = MIN (area->x1, this->x1);
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area->y1 = MIN (area->y1, this->y1);
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area->x2 = MAX (area->x2, this->x2);
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area->y2 = MAX (area->y2, this->y2);
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g_slice_free (GimpArea, this);
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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 retval;
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}
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void
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gimp_area_list_free (GSList *areas)
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{
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GSList *list;
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for (list = areas; list; list = list->next)
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gimp_area_free (list->data);
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g_slist_free (areas);
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}
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