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-rw-r--r--thirdparty/harfbuzz/src/hb-ot-color.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-color.h b/thirdparty/harfbuzz/src/hb-ot-color.h
index c23ce4de44..d11e07e230 100644
--- a/thirdparty/harfbuzz/src/hb-ot-color.h
+++ b/thirdparty/harfbuzz/src/hb-ot-color.h
@@ -102,6 +102,10 @@ hb_ot_color_has_layers (hb_face_t *face);
*
* Pairs of glyph and color index.
*
+ * A color index of 0xFFFF does not refer to a palette
+ * color, but indicates that the foreground color should
+ * be used.
+ *
* Since: 2.1.0
**/
typedef struct hb_ot_color_layer_t {