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/* -*- mode: C; c-file-style: "gnu" -*- */
/* Pango
* pango-glyph-item.c: Pair of PangoItem and a glyph string
*
* Copyright (C) 2002 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 <string.h>
#include "pango-glyph-item.h"
/**
* pango_glyph_item_split:
* @orig: a #PangoItem
* @text: text to which positions in @orig apply.
* @split_index: byte index of position to split item, relative to the start of the item
*
* 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).
*
* This function is similar in function to pango_item_split() (and uses
* it internally)
*
* Return value: new item representing text before @split_index
**/
PangoGlyphItem *
pango_glyph_item_split (PangoGlyphItem *orig,
const char *text,
int split_index)
{
PangoGlyphItem *new;
int i;
int num_glyphs;
int num_remaining;
int split_offset;
gboolean ltr = (orig->item->analysis.level % 2) == 0;
g_return_val_if_fail (orig != NULL, NULL);
g_return_val_if_fail (orig->item->length > 0, NULL);
g_return_val_if_fail (split_index > 0, NULL);
g_return_val_if_fail (split_index < orig->item->length, NULL);
if (ltr)
{
for (i = 0; i < orig->glyphs->num_glyphs; i++)
{
if (orig->glyphs->log_clusters[i] >= split_index)
break;
}
if (i == orig->glyphs->num_glyphs) /* No splitting necessary */
return NULL;
split_index = orig->glyphs->log_clusters[i];
num_glyphs = i;
}
else
{
for (i = orig->glyphs->num_glyphs - 1; i >= 0; i--)
{
if (orig->glyphs->log_clusters[i] >= split_index)
break;
}
if (i < 0) /* No splitting necessary */
return NULL;
split_index = orig->glyphs->log_clusters[i];
num_glyphs = orig->glyphs->num_glyphs - 1 - i;
}
num_remaining = orig->glyphs->num_glyphs - num_glyphs;
new = g_new (PangoGlyphItem, 1);
split_offset = g_utf8_pointer_to_offset (text + orig->item->offset,
text + orig->item->offset + split_index);
new->item = pango_item_split (orig->item, split_index, split_offset);
new->glyphs = pango_glyph_string_new ();
pango_glyph_string_set_size (new->glyphs, num_glyphs);
if (ltr)
{
memcpy (new->glyphs->glyphs, orig->glyphs->glyphs, num_glyphs * sizeof (PangoGlyphInfo));
memcpy (new->glyphs->log_clusters, orig->glyphs->log_clusters, num_glyphs * sizeof (int));
memmove (orig->glyphs->glyphs, orig->glyphs->glyphs + num_glyphs,
num_remaining * sizeof (PangoGlyphInfo));
for (i = num_glyphs; i < orig->glyphs->num_glyphs; i++)
orig->glyphs->log_clusters[i - num_glyphs] = orig->glyphs->log_clusters[i] - split_index;
}
else
{
memcpy (new->glyphs->glyphs, orig->glyphs->glyphs + num_remaining, num_glyphs * sizeof (PangoGlyphInfo));
memcpy (new->glyphs->log_clusters, orig->glyphs->log_clusters + num_remaining, num_glyphs * sizeof (int));
for (i = 0; i < num_remaining; i++)
orig->glyphs->log_clusters[i] = orig->glyphs->log_clusters[i] - split_index;
}
pango_glyph_string_set_size (orig->glyphs, orig->glyphs->num_glyphs - num_glyphs);
return new;
}
static void
append_attrs (PangoGlyphItem *glyph_item,
GSList *attrs)
{
glyph_item->item->analysis.extra_attrs =
g_slist_concat (glyph_item->item->analysis.extra_attrs, attrs);
}
/**
* pango_glyph_item_apply_attrs:
* @glyph_item: a shaped item
* @text: text that @list applies to
* @list: a #PangoAttrList
*
* Splits a shaped item (PangoGlyphItem) into multiple items based
* on an attribute list. The idea is that if you have attributes
* that don't affect shaping, such as color or underline, to avoid
* affecting shaping, you filter them out (pango_attr_list_filter()),
* apply the shaping process and then reapply them to the result using
* this function.
*
* This function takes ownership of @glyph_item; it will be reused
* as one of the elements in the list.
*
* Return value: a list of glyph items resulting from splitting
* @glyph_item. Free the elements using pango_glyph_item_free(),
* the list using g_slist_free().
**/
GSList *
pango_glyph_item_apply_attrs (PangoGlyphItem *glyph_item,
const char *text,
PangoAttrList *list)
{
PangoAttrIterator *iter = pango_attr_list_get_iterator (list);
PangoGlyphItem *new;
GSList *result = NULL;
int start;
int end;
gboolean ltr = (glyph_item->item->analysis.level % 2) == 0;
while (TRUE)
{
pango_attr_iterator_range (iter, &start, &end);
if (start > glyph_item->item->offset)
{
if (start >= glyph_item->item->offset + glyph_item->item->length)
break;
new = pango_glyph_item_split (glyph_item, text,
start - glyph_item->item->offset);
result = g_slist_prepend (result, new);
}
if (end > glyph_item->item->offset)
{
if (end >= glyph_item->item->offset + glyph_item->item->length)
{
append_attrs (glyph_item, pango_attr_iterator_get_attrs (iter));
break;
}
new = pango_glyph_item_split (glyph_item, text,
end - glyph_item->item->offset);
append_attrs (new, pango_attr_iterator_get_attrs (iter));
result = g_slist_prepend (result, new);
}
if (!pango_attr_iterator_next (iter))
break;
}
result = g_slist_prepend (result, glyph_item);
if (ltr)
result = g_slist_reverse (result);
pango_attr_iterator_destroy (iter);
return result;
}
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