Implement baseline shifts

Add a new baseline-shift attribute, which is similar to
rise, but accumulates. In addition, it supports font-
relative values such as superscript and subscript.

We implement support for this by computing baseline
shifts for run during line post-processing, and storing
them in the runs. The renderer now takes these shifts
into account when rendering layout lines.

1 files changed, 4 insertions, 1 deletions

diff --git a/pango/pango-glyph-item.c b/pango/pango-glyph-item.c
index 5e6ca7b6..c64bfa13 100644
--- a/pango/pango-glyph-item.c
+++ b/pango/pango-glyph-item.c
@@ -129,6 +129,8 @@ pango_glyph_item_split (PangoGlyphItem *orig,
 
   pango_glyph_string_set_size (orig->glyphs, orig->glyphs->num_glyphs - num_glyphs);
 
+  new->y_offset = orig->y_offset;
+
   return new;
 }
 
@@ -154,6 +156,7 @@ pango_glyph_item_copy  (PangoGlyphItem *orig)
 
   result->item = pango_item_copy (orig->item);
   result->glyphs = pango_glyph_string_copy (orig->glyphs);
+  result->y_offset = orig->y_offset;
 
   return result;
 }
@@ -196,7 +199,7 @@ G_DEFINE_BOXED_TYPE (PangoGlyphItem, pango_glyph_item,
  * Since: 1.22
  */
 PangoGlyphItemIter *
-pango_glyph_item_iter_copy  (PangoGlyphItemIter *orig)
+pango_glyph_item_iter_copy (PangoGlyphItemIter *orig)
 {
   PangoGlyphItemIter *result;