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/* Pango
* pango-item.c: Single run handling
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <pango-attributes.h>
#include <pango-item.h>
/**
* pango_item_new:
*
* Creates a new #PangoItem structure initialized to default values.
*
* Return value: the new #PangoItem
**/
PangoItem *
pango_item_new (void)
{
PangoItem *result = g_new0 (PangoItem, 1);
return result;
}
/**
* pango_item_copy:
* @item: a #PangoItem
*
* Copy an existing #PangoItem structure.
*
* Return value: the new #PangoItem
**/
PangoItem *
pango_item_copy (PangoItem *item)
{
GSList *extra_attrs, *tmp_list;
PangoItem *result = g_new (PangoItem, 1);
result->offset = item->offset;
result->length = item->length;
result->num_chars = item->num_chars;
extra_attrs = NULL;
tmp_list = item->extra_attrs;
while (tmp_list)
{
extra_attrs = g_slist_prepend (extra_attrs, pango_attribute_copy (tmp_list->data));
tmp_list = tmp_list->next;
}
result->extra_attrs = g_slist_reverse (extra_attrs);
result->analysis = item->analysis;
g_object_ref (G_OBJECT (result->analysis.font));
return result;
}
/**
* pango_item_free:
* @item: a #PangoItem
*
* Free a #PangoItem and all associated memory.
**/
void
pango_item_free (PangoItem *item)
{
if (item->extra_attrs)
{
g_slist_foreach (item->extra_attrs, (GFunc)pango_attribute_destroy, NULL);
g_slist_free (item->extra_attrs);
}
g_object_unref (G_OBJECT (item->analysis.font));
g_free (item);
}
/**
* pango_item_split:
* @orig: a #PangoItem
* @split_index: byte index of position to split item, relative to the start of the item
* @split_offset: number of chars between start of @orig and @split_index
*
* Modifies @orig to cover only the text after @split_index, and
* returns a new item that covers the text before @split_index that
* used to be in @orig. You can think of @split_index as the length of
* the returned item. @split_index may not be 0, and it may not be
* greater than or equal to the length of @orig (that is, there must
* be at least one byte assigned to each item, you can't create a
* zero-length item). @split_offset is the length of the first item in
* chars, and must be provided because the text used to generate the
* item isn't available, so pango_item_split() can't count the char
* length of the split items itself.
*
* Return value: new item representing text before @split_index
**/
PangoItem*
pango_item_split (PangoItem *orig,
int split_index,
int split_offset)
{
PangoItem *new_item = pango_item_copy (orig);
g_return_val_if_fail (orig != NULL, NULL);
g_return_val_if_fail (orig->length > 0, NULL);
g_return_val_if_fail (split_index > 0, NULL);
g_return_val_if_fail (split_index < orig->length, NULL);
g_return_val_if_fail (split_offset > 0, NULL);
g_return_val_if_fail (split_offset < orig->num_chars, NULL);
new_item->length = split_index;
new_item->num_chars = split_offset;
orig->offset += split_index;
orig->length -= split_index;
orig->num_chars -= split_offset;
return new_item;
}
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