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288 lines
6.6 KiB
C
288 lines
6.6 KiB
C
/* ev-mapping.c
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* this file is part of evince, a gnome document viewer
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*
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* Copyright (C) 2009 Carlos Garcia Campos <carlosgc@gnome.org>
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*
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* Evince is free software; you can redistribute it and/or modify it
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* 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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* Evince is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "ev-mapping-list.h"
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/**
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* SECTION: ev-mapping-list
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* @short_description: a refcounted list of #EvMappings.
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*
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* Since: 3.8
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*/
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struct _EvMappingList {
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guint page;
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GList *list;
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GDestroyNotify data_destroy_func;
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volatile gint ref_count;
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};
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G_DEFINE_BOXED_TYPE (EvMappingList, ev_mapping_list, ev_mapping_list_ref, ev_mapping_list_unref)
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/**
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* ev_mapping_list_find:
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* @mapping_list: an #EvMappingList
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* @data: mapping data to find
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*
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* Returns: (transfer none): an #EvMapping
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*/
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EvMapping *
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ev_mapping_list_find (EvMappingList *mapping_list,
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gconstpointer data)
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{
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GList *list;
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for (list = mapping_list->list; list; list = list->next) {
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EvMapping *mapping = list->data;
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if (mapping->data == data)
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return mapping;
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}
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return NULL;
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}
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/**
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* ev_mapping_list_find_custom:
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* @mapping_list: an #EvMappingList
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* @data: mapping data to find
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* @func: (scope call): function to use for equality check
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*
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* Returns: (transfer none): an #EvMapping
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*/
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EvMapping *
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ev_mapping_list_find_custom (EvMappingList *mapping_list,
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gconstpointer data,
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GCompareFunc func)
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{
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GList *list;
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for (list = mapping_list->list; list; list = list->next) {
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EvMapping *mapping = list->data;
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if (!func (mapping->data, data))
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return mapping;
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}
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return NULL;
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}
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/**
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* ev_mapping_list_nth:
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* @mapping_list: an #EvMappingList
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* @n: the position to retrieve
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*
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* Returns: (transfer none): the #Evmapping at position @n in @mapping_list
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*/
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EvMapping *
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ev_mapping_list_nth (EvMappingList *mapping_list,
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guint n)
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{
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g_return_val_if_fail (mapping_list != NULL, NULL);
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return (EvMapping *)g_list_nth_data (mapping_list->list, n);
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}
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static int
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cmp_mapping_area_size (EvMapping *a,
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EvMapping *b)
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{
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gdouble wa, ha, wb, hb;
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wa = a->area.x2 - a->area.x1;
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ha = a->area.y2 - a->area.y1;
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wb = b->area.x2 - b->area.x1;
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hb = b->area.y2 - b->area.y1;
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if (wa == wb) {
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if (ha == hb)
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return 0;
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return (ha < hb) ? -1 : 1;
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}
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if (ha == hb) {
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return (wa < wb) ? -1 : 1;
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}
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return (wa * ha < wb * hb) ? -1 : 1;
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}
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/**
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* ev_mapping_list_get:
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* @mapping_list: an #EvMappingList
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* @x: X coordinate
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* @y: Y coordinate
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*
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* Returns: (transfer none): the #EvMapping in the list at coordinates (x, y)
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*
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* Since: 3.12
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*/
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EvMapping *
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ev_mapping_list_get (EvMappingList *mapping_list,
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gdouble x,
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gdouble y)
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{
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GList *list;
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EvMapping *found = NULL;
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g_return_val_if_fail (mapping_list != NULL, NULL);
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for (list = mapping_list->list; list; list = list->next) {
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EvMapping *mapping = list->data;
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if ((x >= mapping->area.x1) &&
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(y >= mapping->area.y1) &&
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(x <= mapping->area.x2) &&
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(y <= mapping->area.y2)) {
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/* In case of only one match choose that. Otherwise
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* compare the area of the bounding boxes and return the
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* smallest element */
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if(found == NULL || cmp_mapping_area_size (mapping, found) < 0)
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found = mapping;
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}
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}
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return found;
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}
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/**
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* ev_mapping_list_get_data:
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* @mapping_list: an #EvMappingList
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* @x: X coordinate
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* @y: Y coordinate
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*
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* Returns: (transfer none): the data of a mapping in the list at coordinates (x, y)
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*/
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gpointer
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ev_mapping_list_get_data (EvMappingList *mapping_list,
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gdouble x,
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gdouble y)
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{
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EvMapping *mapping;
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mapping = ev_mapping_list_get (mapping_list, x, y);
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if (mapping)
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return mapping->data;
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return NULL;
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}
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/**
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* ev_mapping_list_get_list:
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* @mapping_list: an #EvMappingList
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*
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* Returns: (transfer none) (element-type EvMapping): the data for this mapping list
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*/
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GList *
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ev_mapping_list_get_list (EvMappingList *mapping_list)
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{
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return mapping_list ? mapping_list->list : NULL;
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}
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/**
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* ev_mapping_list_remove:
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* @mapping_list: an #EvMappingList
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* @mapping: #EvMapping to remove
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*
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* Since: 3.14
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*/
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void
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ev_mapping_list_remove (EvMappingList *mapping_list,
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EvMapping *mapping)
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{
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mapping_list->list = g_list_remove (mapping_list->list, mapping);
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mapping_list->data_destroy_func (mapping->data);
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g_free (mapping);
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}
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guint
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ev_mapping_list_get_page (EvMappingList *mapping_list)
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{
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return mapping_list->page;
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}
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guint
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ev_mapping_list_length (EvMappingList *mapping_list)
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{
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g_return_val_if_fail (mapping_list != NULL, 0);
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return g_list_length (mapping_list->list);
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}
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/**
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* ev_mapping_list_new:
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* @page: page index for this mapping
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* @list: (element-type EvMapping): a #GList of data for the page
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* @data_destroy_func: function to free a list element
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*
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* Returns: an #EvMappingList
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*/
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EvMappingList *
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ev_mapping_list_new (guint page,
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GList *list,
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GDestroyNotify data_destroy_func)
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{
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EvMappingList *mapping_list;
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g_return_val_if_fail (data_destroy_func != NULL, NULL);
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mapping_list = g_slice_new (EvMappingList);
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mapping_list->page = page;
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mapping_list->list = list;
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mapping_list->data_destroy_func = data_destroy_func;
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mapping_list->ref_count = 1;
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return mapping_list;
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}
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EvMappingList *
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ev_mapping_list_ref (EvMappingList *mapping_list)
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{
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g_return_val_if_fail (mapping_list != NULL, NULL);
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g_return_val_if_fail (mapping_list->ref_count > 0, mapping_list);
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g_atomic_int_add (&mapping_list->ref_count, 1);
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return mapping_list;
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}
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static void
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mapping_list_free_foreach (EvMapping *mapping,
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GDestroyNotify destroy_func)
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{
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destroy_func (mapping->data);
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g_free (mapping);
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}
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void
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ev_mapping_list_unref (EvMappingList *mapping_list)
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{
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g_return_if_fail (mapping_list != NULL);
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g_return_if_fail (mapping_list->ref_count > 0);
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if (g_atomic_int_add (&mapping_list->ref_count, -1) - 1 == 0) {
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g_list_foreach (mapping_list->list,
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(GFunc)mapping_list_free_foreach,
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mapping_list->data_destroy_func);
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g_list_free (mapping_list->list);
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g_slice_free (EvMappingList, mapping_list);
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}
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}
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