Replace XChar2b with unsigned in all font backends

The xfont backend using XChar2b in its API doesn't mean that we should
use it everywhere else.

* src/dispextern.h (glyph_string):
* src/ftcrfont.c (ftcrfont_draw):
* src/ftxfont.c (ftxfont_draw):
* src/w32term.c (w32_draw_glyphless_glyph_string_foreground):
* src/xdisp.c (init_glyph_string, get_char_face_and_encoding)
(get_glyph_face_and_encoding, get_char_glyph_code)
(fill_gstring_glyph_string, fill_stretch_glyph_string)
(normal_char_ascent_descent, gui_get_glyph_overhangs)
(compute_overhangs_and_x, gui_produce_glyphs):
* src/xfont.c (xfont_get_pcm, xfont_chars_supported, xfont_open)
(xfont_encode_char, xfont_text_extents, xfont_draw)
* src/xftfont.c (xftfont_draw):
* src/xterm.c (x_compute_glyph_string_overhangs)
(x_draw_glyphless_glyph_string_foreground): Use unsigned over XChar2b.

* src/nsgui.h:
* src/w32gui.h:
* src/xterm.h: Remove XChar2b, STORE_XCHAR2B, XCHAR2B_BYTE1, and
XCHAR2B_BYTE2 typedefs and macros.

* src/font.h (font_driver):
(ftfont_text_extents)
* src/ftcrfont.c (ftcrfont_text_extents):
* src/ftfont.c (ftfont_text_extents):
* src/macfont.m (macfont_text_extents):
* src/nsfont.m (nsfont_text_extents):
* src/w32font.h (w32_font_text_extents):
* src/font.c (xfont_text_extents):
* src/xftfont.c (xftfont_text_extents): Make code parameter const.

17 files changed, 103 insertions, 152 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 05e09301b06..eee515f2d24 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1317,7 +1317,7 @@ struct glyph_string
   enum glyph_row_area area;
 
   /* Characters to be drawn, and number of characters.  */
-  XChar2b *char2b;
+  unsigned *char2b;
   int nchars;
 
   /* A face-override for drawing cursors, mouse face and similar.  */
diff --git a/src/font.h b/src/font.h
index 3720650a2e1..9ca0c97dc52 100644
--- a/src/font.h
+++ b/src/font.h
@@ -647,7 +647,7 @@ struct font_driver
      the font FONT and the sequence of glyph codes CODE, and store the
      result in METRICS.  */
   void (*text_extents) (struct font *font,
-                        unsigned *code, int nglyphs,
+                        const unsigned *code, int nglyphs,
                         struct font_metrics *metrics);
 
 #ifdef HAVE_WINDOW_SYSTEM
@@ -894,7 +894,7 @@ extern Lisp_Object ftfont_shape (Lisp_Object);
 extern unsigned ftfont_encode_char (struct font *, int);
 extern void ftfont_close (struct font *);
 extern void ftfont_filter_properties (Lisp_Object, Lisp_Object);
-extern void ftfont_text_extents (struct font *, unsigned *, int,
+extern void ftfont_text_extents (struct font *, const unsigned *, int,
                                  struct font_metrics *);
 extern void syms_of_ftfont (void);
 #endif  /* HAVE_FREETYPE */
diff --git a/src/ftcrfont.c b/src/ftcrfont.c
index e7c73eac4d3..606db0b949b 100644
--- a/src/ftcrfont.c
+++ b/src/ftcrfont.c
@@ -242,7 +242,7 @@ ftcrfont_close (struct font *font)
 
 static void
 ftcrfont_text_extents (struct font *font,
-                       unsigned *code,
+                       const unsigned *code,
                        int nglyphs,
                        struct font_metrics *metrics)
 {
@@ -341,13 +341,12 @@ ftcrfont_draw (struct glyph_string *s,
   glyphs = alloca (sizeof (cairo_glyph_t) * len);
   for (i = 0; i < len; i++)
     {
-      unsigned code = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
-                       | XCHAR2B_BYTE2 (s->char2b + from + i));
-
-      glyphs[i].index = code;
+      glyphs[i].index = s->char2b[from + i];
       glyphs[i].x = x;
       glyphs[i].y = y;
-      x += (s->padding_p ? 1 : ftcrfont_glyph_extents (s->font, code, NULL));
+      x += (s->padding_p ? 1 : ftcrfont_glyph_extents (s->font,
+                                                       glyphs[i].index,
+                                                       NULL));
     }
 
   x_set_cr_source_with_gc_foreground (f, s->gc);
diff --git a/src/ftfont.c b/src/ftfont.c
index 4770c3c40b3..f17bd9ab3f7 100644
--- a/src/ftfont.c
+++ b/src/ftfont.c
@@ -1353,7 +1353,7 @@ ftfont_encode_char (struct font *font, int c)
 }
 
 void
-ftfont_text_extents (struct font *font, unsigned int *code,
+ftfont_text_extents (struct font *font, const unsigned int *code,
                      int nglyphs, struct font_metrics *metrics)
 {
   struct font_info *ftfont_info = (struct font_info *) font;
diff --git a/src/ftxfont.c b/src/ftxfont.c
index f9a69c35151..8bce7f10f1e 100644
--- a/src/ftxfont.c
+++ b/src/ftxfont.c
@@ -252,7 +252,7 @@ ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
   struct font *font = s->font;
   XPoint p[0x700];
   int n[7];
-  unsigned *code;
+  unsigned *code = s->char2b + from;
   int len = to - from;
   int i;
   GC *gcs;
@@ -260,14 +260,9 @@ ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
 
   n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0;
 
-  USE_SAFE_ALLOCA;
-  SAFE_NALLOCA (code, 1, len);
   block_input ();
   if (with_background)
     ftxfont_draw_background (f, font, s->gc, x, y, s->width);
-  for (i = 0; i < len; i++)
-    code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
-               | XCHAR2B_BYTE2 (s->char2b + from + i));
 
   if (face->gc == s->gc)
     {
@@ -312,7 +307,6 @@ ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
     }
 
   unblock_input ();
-  SAFE_FREE ();
 
   return len;
 }
diff --git a/src/macfont.m b/src/macfont.m
index 0ade77e7337..d69af679813 100644
--- a/src/macfont.m
+++ b/src/macfont.m
@@ -1639,7 +1639,7 @@ static Lisp_Object macfont_open (struct frame *, Lisp_Object, int);
 static void macfont_close (struct font *);
 static int macfont_has_char (Lisp_Object, int);
 static unsigned macfont_encode_char (struct font *, int);
-static void macfont_text_extents (struct font *, unsigned int *, int,
+static void macfont_text_extents (struct font *, const unsigned int *, int,
                                   struct font_metrics *);
 static int macfont_draw (struct glyph_string *, int, int, int, int, bool);
 static Lisp_Object macfont_shape (Lisp_Object);
@@ -2735,7 +2735,7 @@ macfont_encode_char (struct font *font, int c)
 }
 
 static void
-macfont_text_extents (struct font *font, unsigned int *code, int nglyphs,
+macfont_text_extents (struct font *font, const unsigned int *code, int nglyphs,
                       struct font_metrics *metrics)
 {
   int width, i;
diff --git a/src/nsfont.m b/src/nsfont.m
index 9721e489357..eca97ab86cc 100644
--- a/src/nsfont.m
+++ b/src/nsfont.m
@@ -945,7 +945,7 @@ nsfont_encode_char (struct font *font, int c)
    of METRICS.  The glyphs are specified by their glyph codes in
    CODE (length NGLYPHS).  */
 static void
-nsfont_text_extents (struct font *font, unsigned int *code,
+nsfont_text_extents (struct font *font, const unsigned int *code,
                      int nglyphs, struct font_metrics *metrics)
 {
   struct nsfont_info *font_info = (struct nsfont_info *)font;
diff --git a/src/nsgui.h b/src/nsgui.h
index 87c06e68a22..c21953593ad 100644
--- a/src/nsgui.h
+++ b/src/nsgui.h
@@ -58,21 +58,6 @@ typedef struct _XCharStruct
   int descent;
 } XCharStruct;
 
-/* Fake structure from Xlib.h to represent two-byte characters.  */
-#ifndef __OBJC__
-typedef unsigned short unichar;
-#endif
-typedef unichar XChar2b;
-
-#define STORE_XCHAR2B(chp, b1, b2) \
-  (*(chp) = ((XChar2b)((((b1) & 0x00ff) << 8) | ((b2) & 0x00ff))))
-
-#define XCHAR2B_BYTE1(chp) \
-  ((*(chp) & 0xff00) >> 8)
-
-#define XCHAR2B_BYTE2(chp) \
-  (*(chp) & 0x00ff)
-
 /* Used in xdisp.c when comparing faces and frame colors.  */
 extern unsigned long ns_color_index_to_rgba(int idx, struct frame *f);
 
diff --git a/src/w32font.c b/src/w32font.c
index 848016da1ca..bd68e22cc90 100644
--- a/src/w32font.c
+++ b/src/w32font.c
@@ -433,7 +433,7 @@ w32font_encode_char (struct font *font, int c)
    CODE (length NGLYPHS).  Apparently metrics can be NULL, in this
    case just return the overall width.  */
 void
-w32font_text_extents (struct font *font, unsigned *code,
+w32font_text_extents (struct font *font, const unsigned *code,
                       int nglyphs, struct font_metrics *metrics)
 {
   int i;
diff --git a/src/w32font.h b/src/w32font.h
index 65f42a3178d..c7bb7f30570 100644
--- a/src/w32font.h
+++ b/src/w32font.h
@@ -74,7 +74,7 @@ int w32font_open_internal (struct frame *f, Lisp_Object font_entity,
                            int pixel_size, Lisp_Object font_object);
 void w32font_close (struct font *font);
 int w32font_has_char (Lisp_Object entity, int c);
-void w32font_text_extents (struct font *font, unsigned *code, int nglyphs,
+void w32font_text_extents (struct font *font, const unsigned *code, int nglyphs,
                            struct font_metrics *metrics);
 int w32font_draw (struct glyph_string *s, int from, int to,
                   int x, int y, bool with_background);
diff --git a/src/w32gui.h b/src/w32gui.h
index 5e1730b92c7..62bad33c19b 100644
--- a/src/w32gui.h
+++ b/src/w32gui.h
@@ -33,19 +33,6 @@ typedef HWND Window;
 typedef HDC Display;  /* HDC so it doesn't conflict with xpm lib.  */
 typedef HCURSOR Emacs_Cursor;
 
-#define XChar2b wchar_t
-
-/* Dealing with bits of wchar_t as if they were an XChar2b.  */
-#define STORE_XCHAR2B(chp, byte1, byte2) \
-  ((*(chp)) = ((XChar2b)((((byte1) & 0x00ff) << 8) | ((byte2) & 0x00ff))))
-
-#define XCHAR2B_BYTE1(chp) \
-  (((*(chp)) & 0xff00) >> 8)
-
-#define XCHAR2B_BYTE2(chp) \
-  ((*(chp)) & 0x00ff)
-
-
 /* Windows equivalent of XImage.  */
 typedef struct _XImage
 {
diff --git a/src/w32term.c b/src/w32term.c
index 4a93b2a4043..5726124b0ed 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -1097,14 +1097,10 @@ w32_compute_glyph_string_overhangs (struct glyph_string *s)
       && s->first_glyph->type == CHAR_GLYPH
       && !s->font_not_found_p)
     {
-      unsigned *code = alloca (sizeof (unsigned) * s->nchars);
       struct font *font = s->font;
       struct font_metrics metrics;
-      int i;
 
-      for (i = 0; i < s->nchars; i++)
-        code[i] = s->char2b[i];
-      font->driver->text_extents (font, code, s->nchars, &metrics);
+      font->driver->text_extents (font, s->char2b, s->nchars, &metrics);
       s->right_overhang = (metrics.rbearing > metrics.width
                            ? metrics.rbearing - metrics.width : 0);
       s->left_overhang = metrics.lbearing < 0 ? -metrics.lbearing : 0;
@@ -1349,7 +1345,7 @@ static void
 w32_draw_glyphless_glyph_string_foreground (struct glyph_string *s)
 {
   struct glyph *glyph = s->first_glyph;
-  XChar2b char2b[8];
+  unsigned char2b[8];
   int x, i, j;
   bool with_background;
 
@@ -1406,16 +1402,12 @@ w32_draw_glyphless_glyph_string_foreground (struct glyph_string *s)
         {
           struct font *font = s->font;
           int upper_len = (len + 1) / 2;
-          unsigned code;
           HFONT old_font;
 
           old_font = SelectObject (s->hdc, FONT_HANDLE (font));
           /* It is certain that all LEN characters in STR are ASCII.  */
           for (j = 0; j < len; j++)
-            {
-              code = font->driver->encode_char (font, str[j]);
-              STORE_XCHAR2B (char2b + j, code >> 8, code & 0xFF);
-            }
+            char2b[j] = font->driver->encode_char (font, str[j]) & 0xFFFF;
           font->driver->draw (s, 0, upper_len,
                               x + glyph->slice.glyphless.upper_xoff,
                               s->ybase + glyph->slice.glyphless.upper_yoff,
diff --git a/src/xdisp.c b/src/xdisp.c
index 6929ca4b4bf..c561ea9e36c 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -25914,7 +25914,7 @@ dump_glyph_string (struct glyph_string *s)
 #endif /* GLYPH_DEBUG */
 
 /* Initialize glyph string S.  CHAR2B is a suitably allocated vector
-   of XChar2b structures for S; it can't be allocated in
+   of 2-byte unsigned integers for S; it can't be allocated in
    init_glyph_string because it must be allocated via `alloca'.  W
    is the window on which S is drawn.  ROW and AREA are the glyph row
    and area within the row from which S is constructed.  START is the
@@ -25944,7 +25944,7 @@ init_glyph_string (struct glyph_string *s,
 #ifdef HAVE_NTGUI
                    HDC hdc,
 #endif
-                   XChar2b *char2b, struct window *w, struct glyph_row *row,
+                   unsigned *char2b, struct window *w, struct glyph_row *row,
                    enum glyph_row_area area, int start, enum draw_glyphs_face hl)
 {
   memset (s, 0, sizeof *s);
@@ -26023,7 +26023,7 @@ append_glyph_string (struct glyph_string **head, struct glyph_string **tail,
 
 static struct face *
 get_char_face_and_encoding (struct frame *f, int c, int face_id,
-                            XChar2b *char2b, bool display_p)
+                            unsigned *char2b, bool display_p)
 {
   struct face *face = FACE_FROM_ID (f, face_id);
   unsigned code = 0;
@@ -26035,7 +26035,8 @@ get_char_face_and_encoding (struct frame *f, int c, int face_id,
       if (code == FONT_INVALID_CODE)
         code = 0;
     }
-  STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
+  /* Ensure that the code is only 2 bytes wide.  */
+  *char2b = code & 0xFFFF;
 
   /* Make sure X resources of the face are allocated.  */
 #ifdef HAVE_X_WINDOWS
@@ -26056,7 +26057,7 @@ get_char_face_and_encoding (struct frame *f, int c, int face_id,
 
 static struct face *
 get_glyph_face_and_encoding (struct frame *f, struct glyph *glyph,
-                             XChar2b *char2b)
+                             unsigned *char2b)
 {
   struct face *face;
   unsigned code = 0;
@@ -26078,7 +26079,8 @@ get_glyph_face_and_encoding (struct frame *f, struct glyph *glyph,
         code = 0;
     }
 
-  STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
+  /* Ensure that the code is only 2 bytes wide.  */
+  *char2b = code & 0xFFFF;
   return face;
 }
 
@@ -26087,7 +26089,7 @@ get_glyph_face_and_encoding (struct frame *f, struct glyph *glyph,
    Return true iff FONT has a glyph for C.  */
 
 static bool
-get_char_glyph_code (int c, struct font *font, XChar2b *char2b)
+get_char_glyph_code (int c, struct font *font, unsigned *char2b)
 {
   unsigned code;
 
@@ -26098,7 +26100,9 @@ get_char_glyph_code (int c, struct font *font, XChar2b *char2b)
 
   if (code == FONT_INVALID_CODE)
     return false;
-  STORE_XCHAR2B (char2b, (code >> 8), (code & 0xFF));
+
+  /* Ensure that the code is only 2 bytes wide.  */
+  *char2b = code & 0xFFFF;
   return true;
 }
 
@@ -26211,7 +26215,8 @@ fill_gstring_glyph_string (struct glyph_string *s, int face_id,
       Lisp_Object lglyph = LGSTRING_GLYPH (lgstring, i);
       unsigned code = LGLYPH_CODE (lglyph);
 
-      STORE_XCHAR2B ((s->char2b + i), code >> 8, code & 0xFF);
+      /* Ensure that the code is only 2 bytes wide.  */
+      s->char2b[i] = code & 0xFFFF;
     }
   s->width = composition_gstring_width (lgstring, s->cmp_from, s->cmp_to, NULL);
   return glyph - s->row->glyphs[s->area];
@@ -26390,17 +26395,16 @@ fill_stretch_glyph_string (struct glyph_string *s, int start, int end)
 }
 
 static struct font_metrics *
-get_per_char_metric (struct font *font, XChar2b *char2b)
+get_per_char_metric (struct font *font, const unsigned *char2b)
 {
   static struct font_metrics metrics;
-  unsigned code;
 
   if (! font)
     return NULL;
-  code = (XCHAR2B_BYTE1 (char2b) << 8) | XCHAR2B_BYTE2 (char2b);
-  if (code == FONT_INVALID_CODE)
+  if (*char2b == FONT_INVALID_CODE)
     return NULL;
-  font->driver->text_extents (font, &code, 1, &metrics);
+
+  font->driver->text_extents (font, char2b, 1, &metrics);
   return &metrics;
 }
 
@@ -26418,7 +26422,7 @@ normal_char_ascent_descent (struct font *font, int c, int *ascent, int *descent)
 
   if (FONT_TOO_HIGH (font))
     {
-      XChar2b char2b;
+      unsigned char2b;
 
       /* Get metrics of C, defaulting to a reasonably sized ASCII
          character.  */
@@ -26465,7 +26469,7 @@ gui_get_glyph_overhangs (struct glyph *glyph, struct frame *f, int *left, int *r
 
   if (glyph->type == CHAR_GLYPH)
     {
-      XChar2b char2b;
+      unsigned char2b;
       struct face *face = get_glyph_face_and_encoding (f, glyph, &char2b);
       if (face->font)
         {
@@ -26779,7 +26783,7 @@ compute_overhangs_and_x (struct glyph_string *s, int x, bool backward_p)
      do                                                                    \
        {                                                                   \
          int face_id;                                                      \
-         XChar2b *char2b;                                                  \
+         unsigned *char2b;                                         \
                                                                            \
          face_id = (row)->glyphs[area][START].face_id;                     \
                                                                            \
@@ -26808,7 +26812,7 @@ compute_overhangs_and_x (struct glyph_string *s, int x, bool backward_p)
     struct face *base_face = FACE_FROM_ID (f, face_id);             \
     ptrdiff_t cmp_id = (row)->glyphs[area][START].u.cmp.id;                 \
     struct composition *cmp = composition_table[cmp_id];                    \
-    XChar2b *char2b;                                                        \
+    unsigned *char2b;                                                       \
     struct glyph_string *first_s = NULL;                                    \
     int n;                                                                  \
                                                                             \
@@ -26840,7 +26844,7 @@ compute_overhangs_and_x (struct glyph_string *s, int x, bool backward_p)
 #define BUILD_GSTRING_GLYPH_STRING(START, END, HEAD, TAIL, HL, X, LAST_X) \
   do {                                                                    \
     int face_id;                                                          \
-    XChar2b *char2b;                                                      \
+    unsigned *char2b;                                                     \
     Lisp_Object gstring;                                                  \
                                                                           \
     face_id = (row)->glyphs[area][START].face_id;                         \
@@ -28433,7 +28437,7 @@ gui_produce_glyphs (struct it *it)
 
   if (it->what == IT_CHARACTER)
     {
-      XChar2b char2b;
+      unsigned char2b;
       struct face *face = FACE_FROM_ID (it->f, it->face_id);
       struct font *font = face->font;
       struct font_metrics *pcm = NULL;
@@ -28832,7 +28836,7 @@ gui_produce_glyphs (struct it *it)
           int lbearing, rbearing;
           int i, width, ascent, descent;
           int c;
-          XChar2b char2b;
+          unsigned char2b;
           struct font_metrics *pcm;
           ptrdiff_t pos;
 
diff --git a/src/xfont.c b/src/xfont.c
index ff80df407d7..a402f770630 100644
--- a/src/xfont.c
+++ b/src/xfont.c
@@ -46,18 +46,20 @@ struct xfont_info
 
 /* Prototypes of support functions.  */
 
-static XCharStruct *xfont_get_pcm (XFontStruct *, XChar2b *);
+static XCharStruct *xfont_get_pcm (XFontStruct *, unsigned char2b);
 
 /* Get metrics of character CHAR2B in XFONT.  Value is null if CHAR2B
    is not contained in the font.  */
 
 static XCharStruct *
-xfont_get_pcm (XFontStruct *xfont, XChar2b *char2b)
+xfont_get_pcm (XFontStruct *xfont, unsigned char2b)
 {
   /* The result metric information.  */
   XCharStruct *pcm = NULL;
+  const unsigned char byte1 = char2b >> 8;
+  const unsigned char byte2 = char2b & 0xFF;
 
-  eassert (xfont && char2b);
+  eassert (xfont);
 
   if (xfont->per_char != NULL)
     {
@@ -66,13 +68,13 @@ xfont_get_pcm (XFontStruct *xfont, XChar2b *char2b)
           /* min_char_or_byte2 specifies the linear character index
              corresponding to the first element of the per_char array,
              max_char_or_byte2 is the index of the last character.  A
-             character with non-zero CHAR2B->byte1 is not in the font.
+             character with non-zero byte1 is not in the font.
              A character with byte2 less than min_char_or_byte2 or
              greater max_char_or_byte2 is not in the font.  */
-          if (char2b->byte1 == 0
-              && char2b->byte2 >= xfont->min_char_or_byte2
-              && char2b->byte2 <= xfont->max_char_or_byte2)
-            pcm = xfont->per_char + char2b->byte2 - xfont->min_char_or_byte2;
+          if (byte1 == 0
+              && byte2 >= xfont->min_char_or_byte2
+              && byte2 <= xfont->max_char_or_byte2)
+            pcm = xfont->per_char + byte2 - xfont->min_char_or_byte2;
         }
       else
         {
@@ -89,14 +91,14 @@ xfont_get_pcm (XFontStruct *xfont, XChar2b *char2b)
              D = max_char_or_byte2 - min_char_or_byte2 + 1
              / = integer division
              \ = integer modulus  */
-          if (char2b->byte1 >= xfont->min_byte1
-              && char2b->byte1 <= xfont->max_byte1
-              && char2b->byte2 >= xfont->min_char_or_byte2
-              && char2b->byte2 <= xfont->max_char_or_byte2)
+          if (byte1 >= xfont->min_byte1
+              && byte1 <= xfont->max_byte1
+              && byte2 >= xfont->min_char_or_byte2
+              && byte2 <= xfont->max_char_or_byte2)
             pcm = (xfont->per_char
                    + ((xfont->max_char_or_byte2 - xfont->min_char_or_byte2 + 1)
-                      * (char2b->byte1 - xfont->min_byte1))
-                   + (char2b->byte2 - xfont->min_char_or_byte2));
+                      * (byte1 - xfont->min_byte1))
+                   + (byte2 - xfont->min_char_or_byte2));
         }
     }
   else
@@ -104,8 +106,8 @@ xfont_get_pcm (XFontStruct *xfont, XChar2b *char2b)
       /* If the per_char pointer is null, all glyphs between the first
          and last character indexes inclusive have the same
          information, as given by both min_bounds and max_bounds.  */
-      if (char2b->byte2 >= xfont->min_char_or_byte2
-          && char2b->byte2 <= xfont->max_char_or_byte2)
+      if (byte2 >= xfont->min_char_or_byte2
+          && byte2 <= xfont->max_char_or_byte2)
         pcm = &xfont->max_bounds;
     }
 
@@ -193,7 +195,6 @@ xfont_chars_supported (Lisp_Object chars, XFontStruct *xfont,
         {
           int c = XFIXNUM (XCAR (chars));
           unsigned code = ENCODE_CHAR (charset, c);
-          XChar2b char2b;
 
           if (code == CHARSET_INVALID_CODE (charset))
             break;
@@ -201,9 +202,7 @@ xfont_chars_supported (Lisp_Object chars, XFontStruct *xfont,
             continue;
           if (code >= 0x10000)
             break;
-          char2b.byte1 = code >> 8;
-          char2b.byte2 = code & 0xFF;
-          if (! xfont_get_pcm (xfont, &char2b))
+          if (! xfont_get_pcm (xfont, code))
             break;
         }
       return (NILP (chars));
@@ -216,7 +215,6 @@ xfont_chars_supported (Lisp_Object chars, XFontStruct *xfont,
         {
           int c = XFIXNUM (AREF (chars, i));
           unsigned code = ENCODE_CHAR (charset, c);
-          XChar2b char2b;
 
           if (code == CHARSET_INVALID_CODE (charset))
             continue;
@@ -224,9 +222,7 @@ xfont_chars_supported (Lisp_Object chars, XFontStruct *xfont,
             break;
           if (code >= 0x10000)
             continue;
-          char2b.byte1 = code >> 8;
-          char2b.byte2 = code & 0xFF;
-          if (xfont_get_pcm (xfont, &char2b))
+          if (xfont_get_pcm (xfont, code))
             break;
         }
       return (i >= 0);
@@ -801,11 +797,9 @@ xfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
   else
     {
       XCharStruct *pcm;
-      XChar2b char2b;
       Lisp_Object val;
 
-      char2b.byte1 = 0x00, char2b.byte2 = 0x20;
-      pcm = xfont_get_pcm (xfont, &char2b);
+      pcm = xfont_get_pcm (xfont, 0x20);
       if (pcm)
         font->space_width = pcm->width;
       else
@@ -823,8 +817,8 @@ xfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
             {
               int width = font->space_width, n = pcm != NULL;
 
-              for (char2b.byte2 = 33; char2b.byte2 <= 126; char2b.byte2++)
-                if ((pcm = xfont_get_pcm (xfont, &char2b)) != NULL)
+              for (unsigned char2b = 33; char2b <= 126; ++char2b)
+                if ((pcm = xfont_get_pcm (xfont, char2b)) != NULL)
                   width += pcm->width, n++;
               if (n > 0)
                 font->average_width = width / n;
@@ -934,7 +928,6 @@ xfont_encode_char (struct font *font, int c)
   XFontStruct *xfont = ((struct xfont_info *) font)->xfont;
   struct charset *charset;
   unsigned code;
-  XChar2b char2b;
 
   charset = CHARSET_FROM_ID (font->encoding_charset);
   code = ENCODE_CHAR (charset, c);
@@ -946,13 +939,11 @@ xfont_encode_char (struct font *font, int c)
       return (ENCODE_CHAR (charset, c) != CHARSET_INVALID_CODE (charset)
               ? code : FONT_INVALID_CODE);
     }
-  char2b.byte1 = code >> 8;
-  char2b.byte2 = code & 0xFF;
-  return (xfont_get_pcm (xfont, &char2b) ? code : FONT_INVALID_CODE);
+  return (xfont_get_pcm (xfont, code) ? code : FONT_INVALID_CODE);
 }
 
 static void
-xfont_text_extents (struct font *font, unsigned int *code,
+xfont_text_extents (struct font *font, const unsigned int *code,
                     int nglyphs, struct font_metrics *metrics)
 {
   XFontStruct *xfont = ((struct xfont_info *) font)->xfont;
@@ -961,13 +952,11 @@ xfont_text_extents (struct font *font, unsigned int *code,
 
   for (i = 0, first = true; i < nglyphs; i++)
     {
-      XChar2b char2b;
       static XCharStruct *pcm;
 
       if (code[i] >= 0x10000)
         continue;
-      char2b.byte1 = code[i] >> 8, char2b.byte2 = code[i] & 0xFF;
-      pcm = xfont_get_pcm (xfont, &char2b);
+      pcm = xfont_get_pcm (xfont, code[i]);
       if (! pcm)
         continue;
       if (first)
@@ -1017,7 +1006,7 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
       USE_SAFE_ALLOCA;
       char *str = SAFE_ALLOCA (len);
       for (i = 0; i < len ; i++)
-        str[i] = XCHAR2B_BYTE2 (s->char2b + from + i);
+        str[i] = s->char2b[from + i] & 0xFF;
       block_input ();
       if (with_background)
         {
@@ -1049,21 +1038,41 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
     {
       if (s->padding_p)
         for (i = 0; i < len; i++)
-          XDrawImageString16 (display, FRAME_X_DRAWABLE (s->f),
-                              gc, x + i, y, s->char2b + from + i, 1);
+          {
+            const unsigned code = s->char2b[from + i];
+            const XChar2b char2b = { .byte1 = code >> 8,
+                                     .byte2 = code & 0xFF };
+            XDrawImageString16 (display, FRAME_X_DRAWABLE (s->f),
+                                gc, x + i, y, &char2b, 1);
+          }
       else
-        XDrawImageString16 (display, FRAME_X_DRAWABLE (s->f),
-                            gc, x, y, s->char2b + from, len);
+        {
+          const unsigned code = s->char2b[from];
+          const XChar2b char2b = { .byte1 = code >> 8,
+                                   .byte2 = code & 0xFF };
+          XDrawImageString16 (display, FRAME_X_DRAWABLE (s->f),
+                              gc, x, y, &char2b, len);
+        }
     }
   else
     {
       if (s->padding_p)
         for (i = 0; i < len; i++)
-          XDrawString16 (display, FRAME_X_DRAWABLE (s->f),
-                         gc, x + i, y, s->char2b + from + i, 1);
+          {
+            const unsigned code = s->char2b[from + i];
+            const XChar2b char2b = { .byte1 = code >> 8,
+                                     .byte2 = code & 0xFF };
+            XDrawString16 (display, FRAME_X_DRAWABLE (s->f),
+                           gc, x + i, y, &char2b, 1);
+          }
       else
-        XDrawString16 (display, FRAME_X_DRAWABLE (s->f),
-                       gc, x, y, s->char2b + from, len);
+        {
+          const unsigned code = s->char2b[from];
+          const XChar2b char2b = { .byte1 = code >> 8,
+                                   .byte2 = code & 0xFF };
+          XDrawString16 (display, FRAME_X_DRAWABLE (s->f),
+                         gc, x, y, &char2b, len);
+        }
     }
   unblock_input ();
 
diff --git a/src/xftfont.c b/src/xftfont.c
index 8a4516f7f91..2edc51fe356 100644
--- a/src/xftfont.c
+++ b/src/xftfont.c
@@ -536,7 +536,7 @@ xftfont_encode_char (struct font *font, int c)
 }
 
 static void
-xftfont_text_extents (struct font *font, unsigned int *code,
+xftfont_text_extents (struct font *font, const unsigned int *code,
                       int nglyphs, struct font_metrics *metrics)
 {
   struct font_info *xftfont_info = (struct font_info *) font;
@@ -621,8 +621,7 @@ xftfont_draw (struct glyph_string *s, int from, int to, int x, int y,
     }
   code = alloca (sizeof (FT_UInt) * len);
   for (i = 0; i < len; i++)
-    code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
-               | XCHAR2B_BYTE2 (s->char2b + from + i));
+    code[i] = s->char2b[from + i];
 
   if (s->padding_p)
     for (i = 0; i < len; i++)
diff --git a/src/xterm.c b/src/xterm.c
index 2de6198359c..bff9f74a17b 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -1599,13 +1599,8 @@ x_compute_glyph_string_overhangs (struct glyph_string *s)
 
       if (s->first_glyph->type == CHAR_GLYPH)
         {
-          unsigned *code = alloca (sizeof (unsigned) * s->nchars);
           struct font *font = s->font;
-          int i;
-
-          for (i = 0; i < s->nchars; i++)
-            code[i] = (s->char2b[i].byte1 << 8) | s->char2b[i].byte2;
-          font->driver->text_extents (font, code, s->nchars, &metrics);
+          font->driver->text_extents (font, s->char2b, s->nchars, &metrics);
         }
       else
         {
@@ -1831,7 +1826,7 @@ static void
 x_draw_glyphless_glyph_string_foreground (struct glyph_string *s)
 {
   struct glyph *glyph = s->first_glyph;
-  XChar2b char2b[8];
+  unsigned char2b[8];
   int x, i, j;
 
   /* If first glyph of S has a left box line, start drawing the text
@@ -1882,14 +1877,10 @@ x_draw_glyphless_glyph_string_foreground (struct glyph_string *s)
       if (str)
         {
           int upper_len = (len + 1) / 2;
-          unsigned code;
 
           /* It is assured that all LEN characters in STR is ASCII.  */
           for (j = 0; j < len; j++)
-            {
-              code = s->font->driver->encode_char (s->font, str[j]);
-              STORE_XCHAR2B (char2b + j, code >> 8, code & 0xFF);
-            }
+            char2b[j] = s->font->driver->encode_char (s->font, str[j]) & 0xFFFF;
           s->font->driver->draw (s, 0, upper_len,
                                  x + glyph->slice.glyphless.upper_xoff,
                                  s->ybase + glyph->slice.glyphless.upper_yoff,
diff --git a/src/xterm.h b/src/xterm.h
index 54473045787..ce1443c381c 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -1262,15 +1262,6 @@ extern void x_session_close (void);
 
 #define FRAME_X_EMBEDDED_P(f) (FRAME_X_OUTPUT(f)->explicit_parent != 0)
 
-#define STORE_XCHAR2B(chp, b1, b2) \
-  ((chp)->byte1 = (b1), (chp)->byte2 = (b2))
-
-#define XCHAR2B_BYTE1(chp) \
-  ((chp)->byte1)
-
-#define XCHAR2B_BYTE2(chp) \
-  ((chp)->byte2)
-
 #define STORE_NATIVE_RECT(nr,rx,ry,rwidth,rheight)      \
   ((nr).x = (rx),                                       \
    (nr).y = (ry),                                       \