[pango/tailor-break: 1/2] Add pango_tailor_break

[Matthias Clasen <matthiasc src gnome org>]

commit f0671eae4e19becac3babeaa0df307bbb7833562
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 14 12:06:18 2019 -0400

    Add pango_tailor_break
    
    This function lets you apply language-specific
    tailoring on top of breaks produced by
    pango_default_break.

 pango/break.c       | 57 ++++++++++++++++++++++++++++++++++++++---------------
 pango/pango-break.h |  7 +++++++
 2 files changed, 48 insertions(+), 16 deletions(-)
---
diff --git a/pango/break.c b/pango/break.c
index 11a1e34a..4518452a 100644
--- a/pango/break.c
+++ b/pango/break.c
@@ -1721,6 +1721,42 @@ pango_find_paragraph_boundary (const gchar *text,
     *next_paragraph_start = start - text;
 }
 
+/**
+ * pango_tailor_break:
+ * @text: text to process. Must be valid UTF-8
+ * @length: length in bytes of @text
+ * @log_attrs: (array length=attrs_len): array with one #PangoLogAttr
+ *   per character in @text, plus one extra, to be filled in
+ * @attrs_len: length of @log_attrs array
+ *
+ * Apply language-specific tailoring to the breaks in
+ * @log_attrs, which are assumed to have been produced
+ * by pango_default_break().
+ */
+void
+pango_tailor_break (const char    *text,
+                    int            length,
+                    PangoAnalysis *analysis,
+                    PangoLogAttr  *log_attrs,
+                    int            log_attrs_len)
+{
+  PangoLogAttr *start = log_attrs;
+  PangoLogAttr attr_before = *start;
+
+  if (tailor_break (text, length, analysis, log_attrs, log_attrs_len))
+    {
+      /* if tailored, we enforce some of the attrs from before
+       * tailoring at the boundary
+       */
+
+     start->backspace_deletes_character  = attr_before.backspace_deletes_character;
+
+     start->is_line_break      |= attr_before.is_line_break;
+     start->is_mandatory_break |= attr_before.is_mandatory_break;
+     start->is_cursor_position |= attr_before.is_cursor_position;
+    }
+}
+
 static int
 tailor_segment (const char      *range_start,
                const char      *range_end,
@@ -1734,22 +1770,11 @@ tailor_segment (const char      *range_start,
 
   chars_in_range = pango_utf8_strlen (range_start, range_end - range_start);
 
-  if (tailor_break (range_start,
-                   range_end - range_start,
-                   analysis,
-                   start,
-                   chars_in_range + 1))
-    {
-      /* if tailored, we enforce some of the attrs from before tailoring at
-       * the boundary
-       */
-
-     start->backspace_deletes_character  = attr_before.backspace_deletes_character;
-
-     start->is_line_break      |= attr_before.is_line_break;
-     start->is_mandatory_break |= attr_before.is_mandatory_break;
-     start->is_cursor_position |= attr_before.is_cursor_position;
-    }
+  pango_tailor_break (range_start,
+                      range_end - range_start,
+                      analysis,
+                      start,
+                      chars_in_range + 1);
 
   return chars_in_range;
 }
diff --git a/pango/pango-break.h b/pango/pango-break.h
index b035506e..f0989300 100644
--- a/pango/pango-break.h
+++ b/pango/pango-break.h
@@ -136,6 +136,13 @@ void pango_default_break (const gchar   *text,
                          PangoLogAttr  *attrs,
                          int            attrs_len);
 
+PANGO_AVAILABLE_IN_ALL
+void pango_tailor_break  (const gchar   *text,
+                         int            length,
+                         PangoAnalysis *analysis,
+                         PangoLogAttr  *attrs,
+                         int            attrs_len);
+
 G_END_DECLS
 
 #endif /* __PANGO_BREAK_H__ */