+static int
+merge_escape_glyph_face (struct it *it)
+{
+ int face_id;
+
+ if (it->f == last_escape_glyph_frame
+ && it->face_id == last_escape_glyph_face_id)
+ face_id = last_escape_glyph_merged_face_id;
+ else
+ {
+ /* Merge the `escape-glyph' face into the current face. */
+ face_id = merge_faces (it->f, Qescape_glyph, 0, it->face_id);
+ last_escape_glyph_frame = it->f;
+ last_escape_glyph_face_id = it->face_id;
+ last_escape_glyph_merged_face_id = face_id;
+ }
+ return face_id;
+}
+
+/* Likewise for glyphless glyph face. */
+
+static struct frame *last_glyphless_glyph_frame = NULL;
+static int last_glyphless_glyph_face_id = (1 << FACE_ID_BITS);
+static int last_glyphless_glyph_merged_face_id = 0;
+
+int
+merge_glyphless_glyph_face (struct it *it)
+{
+ int face_id;
+
+ if (it->f == last_glyphless_glyph_frame
+ && it->face_id == last_glyphless_glyph_face_id)
+ face_id = last_glyphless_glyph_merged_face_id;
+ else
+ {
+ /* Merge the `glyphless-char' face into the current face. */
+ face_id = merge_faces (it->f, Qglyphless_char, 0, it->face_id);
+ last_glyphless_glyph_frame = it->f;
+ last_glyphless_glyph_face_id = it->face_id;
+ last_glyphless_glyph_merged_face_id = face_id;
+ }
+ return face_id;
+}
+
+/* Load IT's display element fields with information about the next
+ display element from the current position of IT. Value is zero if
+ end of buffer (or C string) is reached. */