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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 "config.h"
#include "pango-attributes.h"
#include "pango-item.h"
#include "pango-impl-utils.h"
/**
* pango_item_new:
*
* Creates a new #PangoItem structure initialized to default values.
*
* Return value: the newly allocated #PangoItem, which should
* be freed with pango_item_free().
**/
PangoItem *
pango_item_new (void)
{
PangoItem *result = g_slice_new0 (PangoItem);
return result;
}
/**
* pango_item_copy:
* @item: (nullable): a #PangoItem, may be %NULL
*
* Copy an existing #PangoItem structure.
*
* Return value: (nullable): the newly allocated #PangoItem, which
* should be freed with pango_item_free(), or %NULL if
* @item was %NULL.
**/
PangoItem *
pango_item_copy (PangoItem *item)
{
GSList *extra_attrs, *tmp_list;
PangoItem *result;
if (item == NULL)
return NULL;
result = g_slice_new (PangoItem);
result->offset = item->offset;
result->length = item->length;
result->num_chars = item->num_chars;
result->analysis = item->analysis;
if (result->analysis.font)
g_object_ref (result->analysis.font);
extra_attrs = NULL;
tmp_list = item->analysis.extra_attrs;
while (tmp_list)
{
extra_attrs = g_slist_prepend (extra_attrs, pango_attribute_copy (tmp_list->data));
tmp_list = tmp_list->next;
}
result->analysis.extra_attrs = g_slist_reverse (extra_attrs);
return result;
}
/**
* pango_item_free:
* @item: (nullable): a #PangoItem, may be %NULL
*
* Free a #PangoItem and all associated memory.
**/
void
pango_item_free (PangoItem *item)
{
if (item == NULL)
return;
if (item->analysis.extra_attrs)
{
g_slist_foreach (item->analysis.extra_attrs, (GFunc)pango_attribute_destroy, NULL);
g_slist_free (item->analysis.extra_attrs);
}
if (item->analysis.font)
g_object_unref (item->analysis.font);
g_slice_free (PangoItem, item);
}
G_DEFINE_BOXED_TYPE (PangoItem, pango_item,
pango_item_copy,
pango_item_free);
/**
* 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, which
* should be freed with pango_item_free().
**/
PangoItem*
pango_item_split (PangoItem *orig,
int split_index,
int split_offset)
{
PangoItem *new_item;
g_return_val_if_fail (orig != NULL, 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 = pango_item_copy (orig);
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;
}
static int
compare_attr (gconstpointer p1, gconstpointer p2)
{
if (pango_attribute_equal ((PangoAttribute *)p1, (PangoAttribute *)p2))
return 0;
return 1;
}
void
pango_item_apply_attrs (PangoItem *item,
PangoAttrIterator *iter)
{
int start, end;
GSList *attrs = NULL;
do
{
pango_attr_iterator_range (iter, &start, &end);
if (start >= item->offset + item->length)
break;
if (end >= item->offset)
{
GSList *list, *l;
list = pango_attr_iterator_get_attrs (iter);
for (l = list; l; l = l->next)
{
if (!g_slist_find_custom (attrs, l->data, compare_attr))
attrs = g_slist_prepend (attrs, pango_attribute_copy (l->data));
}
g_slist_free_full (list, (GDestroyNotify)pango_attribute_destroy);
}
if (end >= item->offset + item->length)
break;
}
while (pango_attr_iterator_next (iter));
item->analysis.extra_attrs = g_slist_concat (item->analysis.extra_attrs, attrs);
}
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