wip: Add an api to select palettes for color glyphsfont-palette-api

This commit adds a light-background attribute that can
be used to influence which palette will be used to render
COLRv0 layered glyphs with color fonts that have multiple
palettes. This needs a way for cairo to invalidate its
glyph cache when the selected palette changes, which
needs new freetype api.

1 files changed, 14 insertions, 0 deletions

diff --git a/pango/pango-attributes.c b/pango/pango-attributes.c
index 60d14706..59966575 100644
--- a/pango/pango-attributes.c
+++ b/pango/pango-attributes.c
@@ -1556,6 +1556,20 @@ pango_attr_text_transform_new (PangoTextTransform transform)
 
   return pango_attr_int_new (&klass, transform);
 }
+
+PangoAttribute *
+pango_attr_light_background_new (gboolean light_background)
+{
+  static const PangoAttrClass klass = {
+    PANGO_ATTR_LIGHT_BACKGROUND,
+    pango_attr_int_copy,
+    pango_attr_int_destroy,
+    pango_attr_int_equal
+  };
+
+  return pango_attr_int_new (&klass, light_background);
+}
+
 /* }}} */
 /* {{{ Binding helpers */