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Speed this function up, using the fact that visibility is constant across

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2005-12-12  Matthias Clasen  <mclasen@redhat.com>

	* gtk/gtktextiter.c (gtk_text_iter_set_visible_line_index):
	Speed this function up, using the fact that visibility is
	constant across segments. (#321548, Paolo Borelli)
This commit is contained in:
Matthias Clasen 2005-12-12 19:33:23 +00:00 committed by Matthias Clasen
parent 104772f87a
commit a1577e964c
3 changed files with 46 additions and 30 deletions
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4
ChangeLog
View File

@ -1,5 +1,9 @@
2005-12-12 Matthias Clasen <mclasen@redhat.com>
* gtk/gtktextiter.c (gtk_text_iter_set_visible_line_index):
Speed this function up, using the fact that visibility is
constant across segments. (#321548, Paolo Borelli)
* gtk/gtktextbtree.c (_gtk_text_line_char_to_byte_offsets):
* gtk/gtktextiter.c (gtk_text_iter_backward_chars): Speed up
stepping backwards. (#320638, Larry Ewing, Paolo Borelli)

4
ChangeLog.pre-2-10
View File

@ -1,5 +1,9 @@
2005-12-12 Matthias Clasen <mclasen@redhat.com>
* gtk/gtktextiter.c (gtk_text_iter_set_visible_line_index):
Speed this function up, using the fact that visibility is
constant across segments. (#321548, Paolo Borelli)
* gtk/gtktextbtree.c (_gtk_text_line_char_to_byte_offsets):
* gtk/gtktextiter.c (gtk_text_iter_backward_chars): Speed up
stepping backwards. (#320638, Larry Ewing, Paolo Borelli)

60
gtk/gtktextiter.c
View File

@ -3890,12 +3890,6 @@ gtk_text_iter_set_visible_line_offset (GtkTextIter *iter,
gtk_text_iter_forward_line (iter);
}
static gint
bytes_in_char (GtkTextIter *iter)
{
return g_unichar_to_utf8 (gtk_text_iter_get_char (iter), NULL);
}
/**
* gtk_text_iter_set_visible_line_index:
* @iter: a #GtkTextIter
@ -3906,40 +3900,54 @@ bytes_in_char (GtkTextIter *iter)
* in the index.
**/
void
gtk_text_iter_set_visible_line_index (GtkTextIter *iter,
gint byte_on_line)
gtk_text_iter_set_visible_line_index (GtkTextIter *iter,
gint byte_on_line)
{
gint bytes_seen = 0;
gint skipped = 0;
GtkTextRealIter *real;
gint bytes_in_line = 0;
gint offset = 0;
GtkTextIter pos;
GtkTextLineSegment *seg;
g_return_if_fail (iter != NULL);
gtk_text_iter_set_line_offset (iter, 0);
bytes_in_line = gtk_text_iter_get_bytes_in_line (iter);
pos = *iter;
/* For now we use a ludicrously slow implementation */
while (bytes_seen < byte_on_line)
real = gtk_text_iter_make_real (&pos);
if (real == NULL)
return;
ensure_byte_offsets (real);
check_invariants (&pos);
seg = _gtk_text_iter_get_indexable_segment (&pos);
while (seg != NULL && byte_on_line > 0)
{
if (!_gtk_text_btree_char_is_invisible (&pos))
bytes_seen += bytes_in_char (&pos);
else skipped++;
{
if (byte_on_line < seg->byte_count)
{
iter_set_from_byte_offset (real, real->line, offset + byte_on_line);
byte_on_line = 0;
break;
}
else
byte_on_line -= seg->byte_count;
}
if (!gtk_text_iter_forward_char (&pos))
break;
if (bytes_seen >= byte_on_line)
break;
offset += seg->byte_count;
_gtk_text_iter_forward_indexable_segment (&pos);
seg = _gtk_text_iter_get_indexable_segment (&pos);
}
if (bytes_seen > byte_on_line)
g_warning ("%s: Incorrect visible byte index %d falls in the middle of a UTF-8 "
"character; this will crash the text buffer. "
"Byte indexes must refer to the start of a character.",
G_STRLOC, byte_on_line);
if (_gtk_text_iter_get_text_line (&pos) == _gtk_text_iter_get_text_line (iter))
if (byte_on_line == 0)
*iter = pos;
else
gtk_text_iter_forward_line (iter);