delete lang engine

2000-11-30  Havoc Pennington  <hp@pobox.com>

* modules/thai/thai.c: delete lang engine

* modules/tamil/tamil.c: delete lang engine
(tamil_engine_x_new): fix type tag for shape engine

* modules/indic/myanmar.c: delete lang engine
(pango_engine_x_new): fix type tag for shape engine

* modules/indic/gurmukhi.c: delete lang engine
(pango_indic_engine_x_new): fix type tag for shape engine

* modules/indic/gujarati.c: delete lang engine
(pango_indic_engine_x_new): fix type tag for shape engine

* modules/indic/devanagari.c: delete lang engine
(pango_indic_engine_x_new): fix type tag for shape engine

* modules/indic/pango-indic-script.h (SCRIPT_ENGINE_DEFINITION):
delete lang engine

* modules/indic/bengali.c: delete the lang engine
(pango_indic_engine_x_new): fix type tag for shape engine

* modules/hangul/hangul.c: delete the lang engine
(hangul_engine_x_new): fix type tag for shape engine

* modules/basic/basic.c: delete the lang engine
(basic_engine_x_new): fix type tag for shape engine

* modules/basic/basic-win32.c: delete the lang engine
(basic_engine_win32_new): this was a shape engine,
use correct type tag

* modules/basic/basic-ft2.c: delete the lang engine

* modules/arabic/arabic.c: Delete the lang engine
(arabic_engine_x_new): this is a shape
engine, not a lang engine, fix type tag

* pango/pango-layout.c (pango_layout_index_to_line_x): handle
the fact that paragraph delimiters aren't in the layout lines
(pango_layout_index_to_pos): update to handle paragraph
delimiters

* pango/break.c (pango_find_paragraph_boundary): New function
to find paragraph boundaries

* pango/pango-layout.c (get_items_log_attrs): don't separate calls
to pango_break() when directional level changes

* pango/pango-layout.h (struct _PangoLayoutLine): put start index
of the line into the struct

 * pango/pango-layout.c (pango_layout_get_cursor_pos): Fixups to
 reflect the fact that paragraph separators are removed from the
 input text.

 * pango/pango-layout.c (can_break_at): don't
 special-case start of line and whitespace-following-alphabetic
 here, because pango_break() already handles that properly

 * tests/testboundaries.c, tests/Makefile.am, tests/runtests.sh:
 Add directory for test programs, and a script to run them all

 * configure.in: Create Makefile in tests

 * pango/break.c (pango_break): Try for a real implementation of
 the Unicode text boundary algorithms
 (pango_get_log_attrs): Allow length to be -1

 * pango/pango-context.c (pango_itemize): use pango_item_new(),
 assert that items added to the list are sane.

 * pango/pango-layout.c (pango_layout_check_lines): Reimplement
 to honor the paragraph boundaries from pango_break()

 * pango/pango-layout.c (process_item): use pango_item_split() here

 * pango/pango-item.c (pango_item_split): New function to split an
 item into two items

1 files changed, 42 insertions, 0 deletions

diff --git a/pango/pango-item.c b/pango/pango-item.c
index d3e0dbd9..b13b60e9 100644
--- a/pango/pango-item.c
+++ b/pango/pango-item.c
@@ -88,3 +88,45 @@ pango_item_free (PangoItem *item)
   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;
+}