+/* Get face and two-byte form of character C in face FACE_ID on frame
+ F. The encoding of C is returned in *CHAR2B. MULTIBYTE_P non-zero
+ means we want to display multibyte text. DISPLAY_P non-zero means
+ make sure that X resources for the face returned are allocated.
+ Value is a pointer to a realized face that is ready for display if
+ DISPLAY_P is non-zero. */
+
+static INLINE struct face *
+get_char_face_and_encoding (f, c, face_id, char2b, multibyte_p, display_p)
+ struct frame *f;
+ int c, face_id;
+ XChar2b *char2b;
+ int multibyte_p, display_p;
+{
+ struct face *face = FACE_FROM_ID (f, face_id);
+
+#ifdef USE_FONT_BACKEND
+ if (enable_font_backend)
+ {
+ struct font *font = (struct font *) face->font_info;
+
+ if (font)
+ {
+ unsigned code = font->driver->encode_char (font, c);
+
+ if (code != FONT_INVALID_CODE)
+ STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
+ else
+ STORE_XCHAR2B (char2b, 0, 0);
+ }
+ }
+ else
+#endif /* USE_FONT_BACKEND */
+ if (!multibyte_p)
+ {
+ /* Unibyte case. We don't have to encode, but we have to make
+ sure to use a face suitable for unibyte. */
+ STORE_XCHAR2B (char2b, 0, c);
+ face_id = FACE_FOR_CHAR (f, face, c, -1, Qnil);
+ face = FACE_FROM_ID (f, face_id);
+ }
+ else if (c < 128)
+ {
+ /* Case of ASCII in a face known to fit ASCII. */
+ STORE_XCHAR2B (char2b, 0, c);
+ }
+ else if (face->font != NULL)
+ {
+ struct font_info *font_info
+ = FONT_INFO_FROM_ID (f, face->font_info_id);
+ struct charset *charset = CHARSET_FROM_ID (font_info->charset);
+ unsigned code = ENCODE_CHAR (charset, c);
+
+ if (CHARSET_DIMENSION (charset) == 1)
+ STORE_XCHAR2B (char2b, 0, code);
+ else
+ STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
+ /* Maybe encode the character in *CHAR2B. */
+ FRAME_RIF (f)->encode_char (c, char2b, font_info, charset, NULL);
+ }
+
+ /* Make sure X resources of the face are allocated. */
+#ifdef HAVE_X_WINDOWS
+ if (display_p)
+#endif
+ {
+ xassert (face != NULL);
+ PREPARE_FACE_FOR_DISPLAY (f, face);
+ }
+
+ return face;
+}
+
+