(ucs-mule-to-mule-unicode): Define this

translation table name here.
(ucs-mule-cjk-to-unicode): New translation table name.
(ccl-encode-unicode-font): Merge the code in ucs-tables.el.
(font-ccl-encoder-alist): Change the font registry pattern to
"ISO10646.*-*".

1 files changed, 61 insertions, 26 deletions

diff --git a/lisp/international/fontset.el b/lisp/international/fontset.el
index 9ea6e8d3f8e..2c73d46b532 100644
--- a/lisp/international/fontset.el
+++ b/lisp/international/fontset.el
@@ -142,35 +142,70 @@
 (set-font-encoding "ISO8859-1" 'ascii 0)
 (set-font-encoding "JISX0201" 'latin-jisx0201 0)
 
+;; Allow display of arbitrary characters with an iso-10646-encoded
+;; (`Unicode') font.
+(define-translation-table 'ucs-mule-to-mule-unicode
+  ucs-mule-to-mule-unicode)
+(define-translation-hash-table 'ucs-mule-cjk-to-unicode
+  ucs-mule-cjk-to-unicode)
+
 (define-ccl-program ccl-encode-unicode-font
   `(0
-    (if (r0 == ,(charset-id 'ascii))
-        ((r2 = r1)
-         (r1 = 0))
-      (if (r0 == ,(charset-id 'latin-iso8859-1))
-          ((r2 = (r1 + 128))
-           (r1 = 0))
-        (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
-            ((r1 *= 96)
-             (r1 += r2)
-             (r1 += ,(- #x100 (* 32 96) 32))
-             (r1 >8= 0)
-             (r2 = r7))
-          (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
-              ((r1 *= 96)
-               (r1 += r2)
-               (r1 += ,(- #x2500 (* 32 96) 32))
-               (r1 >8= 0)
-               (r2 = r7))
-            (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
-                ((r1 *= 96)
-                 (r1 += r2)
-                 (r1 += ,(- #xe000 (* 32 96) 32))
-                 (r1 >8= 0)
-                 (r2 = r7)))))))))
-
+    ;; r0: charset-id
+    ;; r1: 1st position code
+    ;; r2: 2nd position code (if r0 is 2D charset)
+    ((if (r0 == ,(charset-id 'ascii))
+         ((r2 = r1)
+          (r1 = 0))
+       ;; At first, try to get a Unicode code point directly.
+       ((if (r2 >= 0)
+            ;; This is a 2D charset.
+            (r1 = ((r1 << 7) | r2)))
+        (lookup-character ucs-mule-cjk-to-unicode r0 r1)
+        (if r7
+            ;; We got it!
+            ((r1 = (r0 >> 8))
+             (r2 = (r0 & #xFF)))
+          ;; Look for a translation for non-ASCII chars.
+          ((translate-character ucs-mule-to-mule-unicode r0 r1)
+           (if (r0 == ,(charset-id 'latin-iso8859-1))
+               ((r2 = (r1 + 128))
+                (r1 = 0))
+             ((r2 = (r1 & #x7F))
+              (r1 >>= 7)
+              (if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
+                  ((r1 *= 96)
+                   (r1 += r2)
+                   (r1 += ,(- #x100 (* 32 96) 32))
+                   (r1 >8= 0)
+                   (r2 = r7))
+                (if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
+                    ((r1 *= 96)
+                     (r1 += r2)
+                     (r1 += ,(- #x2500 (* 32 96) 32))
+                     (r1 >8= 0)
+                     (r2 = r7))
+                  (if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
+                      ((r1 *= 96)
+                       (r1 += r2)
+                       (r1 += ,(- #xe000 (* 32 96) 32))
+                       (r1 >8= 0)
+                       (r2 = r7))
+                    ;; No way, use the glyph for U+FFFD.
+                    ((r1 = #xFF)
+                     (r2 = #xFD)))))))))))))
+  "Encode characters for display with iso10646 font.
+Translate through the translation-hash-table named
+`ucs-mule-cjk-to-unicode' and the translation-table named
+`ucs-mule-to-mule-unicode' initially.")
+
+;; Use the above CCL encoder for Unicode fonts.  Please note that the
+;; regexp is not simply "ISO10646-1" because there exists, for
+;; instance, the following Devanagari Unicode fonts:
+;;      -misc-fixed-medium-r-normal--24-240-72-72-c-120-iso10646.indian-1
+;;      -sibal-devanagari-medium-r-normal--24-240-75-75-P--iso10646-dev
 (setq font-ccl-encoder-alist
-      (cons '("ISO10646-1" . ccl-encode-unicode-font)
+      (cons '("ISO10646.*-*" . ccl-encode-unicode-font)
             font-ccl-encoder-alist))
 
 ;; Setting for suppressing XLoadQueryFont on big fonts.