(OTF_drive_gpos2): Extern it.

diff --git a/src/otf.h b/src/otf.h
index 47e2a78..431e288 100644 (file)
--- a/src/otf.h
+++ b/src/otf.h
@@ -1186,7 +1186,14 @@ typedef struct
   int c;
 
   /* Glyph ID of the glyph.  If the value is 0, the library gets a
-     correct value from the above character code via cmap.  */
+     correct value from the above character code via cmap if such a
+     glyph is available in the font.
+
+     The function OTF_drive_gpos2 may insert a glyph whose glyph_id is
+     0 but positioning_type is positive.  It is not an actual glyph
+     but just contains positioning information that should be
+     accumulated to the positioning information of the previous
+     glyphs.  */
   OTF_GlyphID glyph_id;
 
   /* GlyphClass of the glyph.  The value is extracted from the GDEF
@@ -1258,7 +1265,7 @@ typedef struct
     Process glyph string by Unicode-based cmap table.
 
     The OTF_drive_cmap() function looks up a Unicode-based cmap table
-    of OpenType font $OTF, and setup the member <glyhph_id> of all
+    of OpenType font $OTF, and setup the member <glyph_id> of all
     glhphs in the glyph string $GSTRING if the value of the member is
     not zero.  */
 
@@ -1269,7 +1276,7 @@ extern int OTF_drive_cmap (OTF *otf, OTF_GlyphString *gstring);
 
     The OTF_drive_cmap2() function looks up a cmap table (whose
     Platform-ID is $PLATFORM_ID an Encoding-ID is $ENCODING_ID) of
-    OpenType font $OTF, and setup the member <glyhph_id> of all glhphs
+    OpenType font $OTF, and setup the member <glyph_id> of all glhphs
     in the glyph string $GSTRING if the value of the member is not
     zero.  */
 
@@ -1310,15 +1317,25 @@ extern int OTF_drive_gsub (OTF *otf, OTF_GlyphString *gstring,
 /***
     Process glyph string by GPOS table.
 
-    The OTF_drive_gdef() function looks up the GPOS table of $OTF of
+    The OTF_drive_gpos() function is deprecated.  Use
+    OTF_drive_gpos2() instread.  */
+
+extern int OTF_drive_gpos (OTF *otf, OTF_GlyphString *gstring,
+                          const char *script, const char *language,
+                          const char *features);
+
+/***
+    Process glyph string by GPOS table.
+
+    The OTF_drive_gpos2() function looks up the GPOS table of $OTF of
     OpenType font $OTF, and by using features the font has for script
     $SCRIPT and language system $LANGSYS, setup members
     <positioning_type> and <f> of all glhphs in the glyph string
     $GSTRING.  $FEATURES is a list of features to apply.  */
 
-extern int OTF_drive_gpos (OTF *otf, OTF_GlyphString *gstring,
-                          const char *script, const char *language,
-                          const char *features);
+extern int OTF_drive_gpos2 (OTF *otf, OTF_GlyphString *gstring,
+                           const char *script, const char *language,
+                           const char *features);
 
 /*** (3-6) OTF_drive_tables() */