Remove declarations of unimplemented functions

* docs/pango-sections.txt, pango/pango-ot.h: Remove declarations
        of unimplemented functions pango_ot_ruleset_set_glyph_loader and
        pango_ot_ruleset_set_alternate_func and the related typedefs
        PangoOTGlyphLoader and PangoOTAlternateFunc.

        * pango/opentype/pango-ot-info.c,
        pango/opentype/pango-ot-ruleset.c: Documentation updates.

src/pango-ot-info.c

@@ -94,6 +94,13 @@ pango_ot_info_finalize (GObject *object)
     }
 }
 
+/**
+ * pango_ot_info_new:
+ * @face: a #FT_Face.
+ * @returns: a new #PangoOTInfo for @face.
+ * 
+ * Creates a new #PangoOTInfo structure for the given FreeType font.
+ **/
 PangoOTInfo *
 pango_ot_info_new (FT_Face face)
 {
@@ -223,6 +230,16 @@ get_tables (PangoOTInfo      *info,
     }
 }
 
+/**
+ * pango_ot_info_find_script:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @script_tag: the tag of the script to find.
+ * @script_index: location to store the index of the script, or %NULL.
+ * @returns: %TRUE if the script was found.
+ * 
+ * Finds the index of a script.
+ **/
 gboolean 
 pango_ot_info_find_script (PangoOTInfo      *info,
 			   PangoOTTableType  table_type,
@@ -251,6 +268,19 @@ pango_ot_info_find_script (PangoOTInfo      *info,
   return FALSE;
 }
 
+/**
+ * pango_ot_info_find_language:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @script_index: the index of the script whose languages are searched.
+ * @language_tag: the tag of the language to find.
+ * @language_index: location to store the index of the language, or %NULL.
+ * @required_feature_index: location to store the required feature index of 
+ *    the language, or %NULL.
+ * @returns: %TRUE if the language was found.
+ * 
+ * Finds the index of a language and its required feature index.  
+ **/
 gboolean
 pango_ot_info_find_language (PangoOTInfo      *info,
 			     PangoOTTableType  table_type,
@@ -287,6 +317,19 @@ pango_ot_info_find_language (PangoOTInfo      *info,
   return FALSE;
 }
 
+/**
+ * pango_ot_info_find_feature:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @feature_tag: the tag of the feature to find.
+ * @script_index: the index of the script.
+ * @language_index: the index of the language whose features are searched,
+ *     or 0xffff to use the default language of the script.
+ * @feature_index: location to store the index of the feature, or %NULL. 
+ * @returns: %TRUE if the feature was found.
+ * 
+ * Finds the index of a feature.
+ **/
 gboolean
 pango_ot_info_find_feature  (PangoOTInfo      *info,
 			     PangoOTTableType  table_type,
@@ -335,6 +378,15 @@ pango_ot_info_find_feature  (PangoOTInfo      *info,
   return FALSE;
 }
 
+/**
+ * pango_ot_info_list_scripts:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @returns: a newly-allocated array containing the tags of the
+ *   available scripts.
+ *
+ * Obtains the list of available scripts. 
+ **/
 PangoOTTag *
 pango_ot_info_list_scripts (PangoOTInfo      *info,
 			    PangoOTTableType  table_type)
@@ -358,6 +410,17 @@ pango_ot_info_list_scripts (PangoOTInfo      *info,
   return result;
 }
 
+/**
+ * pango_ot_info_list_languages:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @script_index: the index of the script to list languages for.
+ * @language_tag: unused parameter.
+ * @returns: a newly-allocated array containing the tags of the
+ *   available languages.
+ * 
+ * Obtains the list of available languages for a given script.
+ **/ 
 PangoOTTag *
 pango_ot_info_list_languages (PangoOTInfo      *info,
 			      PangoOTTableType  table_type,
@@ -388,6 +451,19 @@ pango_ot_info_list_languages (PangoOTInfo      *info,
   return result;
 }
 
+/** 
+ * pango_ot_info_list_features:
+ * @info: a #PangoOTInfo.
+ * @table_type: the table type to obtain information about.
+ * @tag: unused parameter.
+ * @script_index: the index of the script to obtain information about. 
+ * @language_index: the indes of the language to list features for, or
+ *     0xffff, to list features for the default language of the script.
+ * @returns: a newly-allocated array containing the tags of the available
+ *    features. 
+ *
+ * Obtains the list of features for the given language of the given script.
+ **/
 PangoOTTag *
 pango_ot_info_list_features  (PangoOTInfo      *info,
 			      PangoOTTableType  table_type,

src/pango-ot-ruleset.c

@@ -90,6 +90,13 @@ pango_ot_ruleset_finalize (GObject *object)
   g_object_unref (G_OBJECT (ruleset->info));
 }
 
+/**
+ * pango_ot_ruleset_new:
+ * @info: a #PangoOTInfo.
+ * @returns: a new #PangoOTRuleset.
+ *
+ * Creates a new #PangoOTRuleset for the given OpenType info.
+ **/
 PangoOTRuleset *
 pango_ot_ruleset_new (PangoOTInfo *info)
 {
@@ -102,6 +109,16 @@ pango_ot_ruleset_new (PangoOTInfo *info)
   return ruleset;
 }
 
+/**
+ * pango_ot_ruleset_add_feature:
+ * @ruleset: a #PangoOTRuleset.
+ * @table_type: the table type to add a feature to.
+ * @feature_index: the index of the feature to add.
+ * @property_bit: the property bit to use for this feature. 
+ *
+ * Adds a feature to the ruleset. See pango_ot_ruleset_shape()
+ * for an explanation of @property_bit.
+ **/
 void
 pango_ot_ruleset_add_feature (PangoOTRuleset   *ruleset,
 			      PangoOTTableType  table_type,
@@ -119,6 +136,16 @@ pango_ot_ruleset_add_feature (PangoOTRuleset   *ruleset,
   g_array_append_val (ruleset->rules, tmp_rule);
 }
 
+/**
+ * pango_ot_ruleset_shape:
+ * @ruleset: a #PangoOTRuleset.
+ * @glyphs: a pointer to a #PangoGlyphString.
+ * @properties: an array containing one #gulong bitfield for each glyph,
+ *   which gives the glyph's properties: If a certain bit is set for a glyph, 
+ *   the feature which has the same bit set in its property value is applied.
+ *
+ * Shapes a string of glyphs with the given properties according to @ruleset.
+ **/
 void
 pango_ot_ruleset_shape (PangoOTRuleset   *ruleset,
 			PangoGlyphString *glyphs,