Merge branch 'preferred-languages' into 'master'

Preferred languages

See merge request GNOME/pango!232

7 files changed, 153 insertions, 5 deletions

diff --git a/pango/pango-language.c b/pango/pango-language.c
index 410ca0bf..04c3e0ca 100644
--- a/pango/pango-language.c
+++ b/pango/pango-language.c
@@ -791,13 +791,14 @@ parse_default_languages (void)
   return (PangoLanguage **) g_array_free (langs, FALSE);
 }
 
+G_LOCK_DEFINE_STATIC (languages);
+static gboolean initialized = FALSE; /* MT-safe */
+static PangoLanguage * const * languages = NULL; /* MT-safe */
+static GHashTable *hash = NULL; /* MT-safe */
+
 static PangoLanguage *
 _pango_script_get_default_language (PangoScript script)
 {
-  G_LOCK_DEFINE_STATIC (languages);
-  static gboolean initialized = FALSE; /* MT-safe */
-  static PangoLanguage * const * languages = NULL; /* MT-safe */
-  static GHashTable *hash = NULL; /* MT-safe */
   PangoLanguage *result, * const * p;
 
   G_LOCK (languages);
@@ -835,6 +836,33 @@ out:
 }
 
 /**
+ * pango_language_get_preferred:
+ *
+ * Returns the list of languages that the user prefers, as specified
+ * by the PANGO_LANGUAGE or LANGUAGE environment variables, in order
+ * of preference. Note that this list does not necessarily include
+ * the language returned by pango_language_get_default().
+ *
+ * When choosing language-specific resources, such as the sample
+ * text returned by pango_language_get_sample_string(), you should
+ * first try the default language, followed by the languages returned
+ * by this function.
+ *
+ * Returns: (transfer none) (nullable): a %NULL-terminated array of
+ *    PangoLanguage*
+ *
+ * Since: 1.48
+ */
+PangoLanguage **
+pango_language_get_preferred (void)
+{
+  /* We call this just for its side-effect of initializing languages */
+  _pango_script_get_default_language (PANGO_SCRIPT_COMMON);
+
+  return languages;
+}
+
+/**
  * pango_script_get_sample_language:
  * @script: a #PangoScript
  *
diff --git a/pango/pango-language.h b/pango/pango-language.h
index 2ab07bc0..16e6512c 100644
--- a/pango/pango-language.h
+++ b/pango/pango-language.h
@@ -53,6 +53,9 @@ const char    *pango_language_get_sample_string (PangoLanguage *language) G_GNUC
 PANGO_AVAILABLE_IN_1_16
 PangoLanguage *pango_language_get_default (void) G_GNUC_CONST;
 
+PANGO_AVAILABLE_IN_1_48
+PangoLanguage **pango_language_get_preferred (void) G_GNUC_CONST;
+
 PANGO_AVAILABLE_IN_ALL
 gboolean      pango_language_matches  (PangoLanguage *language,
 				       const char *range_list) G_GNUC_PURE;
diff --git a/pango/pango-version-macros.h b/pango/pango-version-macros.h
index 52b37049..4008579c 100644
--- a/pango/pango-version-macros.h
+++ b/pango/pango-version-macros.h
@@ -262,6 +262,16 @@
  */
 #define PANGO_VERSION_1_46       (G_ENCODE_VERSION (1, 46))
 
+/**
+ * PANGO_VERSION_1_48:
+ *
+ * A macro that evaluates to the 1.48 version of Pango, in a format
+ * that can be used by the C pre-processor.
+ *
+ * Since: 1.48
+ */
+#define PANGO_VERSION_1_48       (G_ENCODE_VERSION (1, 48))
+
 /* evaluates to the current stable version; for development cycles,
  * this means the next stable target
  */
@@ -681,4 +691,18 @@
 # define PANGO_AVAILABLE_IN_1_46                _PANGO_EXTERN
 #endif
 
+#if PANGO_VERSION_MIN_REQUIRED >= PANGO_VERSION_1_48
+# define PANGO_DEPRECATED_IN_1_48               PANGO_DEPRECATED
+# define PANGO_DEPRECATED_IN_1_48_FOR(f)        PANGO_DEPRECATED_FOR(f)
+#else
+# define PANGO_DEPRECATED_IN_1_48               _PANGO_EXTERN
+# define PANGO_DEPRECATED_IN_1_48_FOR(f)        _PANGO_EXTERN
+#endif
+
+#if PANGO_VERSION_MAX_ALLOWED < PANGO_VERSION_1_48
+# define PANGO_AVAILABLE_IN_1_48                PANGO_UNAVAILABLE(1, 48)
+#else
+# define PANGO_AVAILABLE_IN_1_48                _PANGO_EXTERN
+#endif
+
 #endif /* __PANGO_VERSION_H__ */
diff --git a/pango/pangofc-font.c b/pango/pangofc-font.c
index 7456cd9e..6c5492ad 100644
--- a/pango/pangofc-font.c
+++ b/pango/pangofc-font.c
@@ -1035,3 +1035,35 @@ pango_fc_font_create_hb_font (PangoFont *font)
 done:
   return hb_font;
 }
+
+/**
+ * pango_fc_font_get_languages:
+ * @font: a #PangoFcFont
+ *
+ * Returns the languages that are supported by @font.
+ *
+ * This corresponds to the FC_LANG member of the FcPattern.
+ *
+ * The returned array is only valid as long as the font
+ * and its fontmap are valid.
+ *
+ * Returns: (transfer none) (nullable): a %NULL-terminated
+ *    array of PangoLanguage*
+ *
+ * Since: 1.48
+ */
+PangoLanguage **
+pango_fc_font_get_languages (PangoFcFont *font)
+{
+  PangoFcFontMap *fontmap;
+  PangoLanguage **languages;
+
+  fontmap = g_weak_ref_get ((GWeakRef *) &font->fontmap);
+  if (!fontmap)
+    return NULL;
+
+  languages  = _pango_fc_font_map_get_languages (fontmap, font);
+  g_object_unref (fontmap);
+
+  return languages;
+}
diff --git a/pango/pangofc-font.h b/pango/pangofc-font.h
index 25a0277c..aa4fd3b0 100644
--- a/pango/pangofc-font.h
+++ b/pango/pangofc-font.h
@@ -94,6 +94,10 @@ gboolean   pango_fc_font_has_char          (PangoFcFont      *font,
 PANGO_AVAILABLE_IN_1_4
 guint      pango_fc_font_get_glyph         (PangoFcFont      *font,
                                             gunichar          wc);
+PANGO_AVAILABLE_IN_1_48
+PangoLanguage **
+           pango_fc_font_get_languages     (PangoFcFont      *font);
+
 PANGO_DEPRECATED_FOR(PANGO_GET_UNKNOWN_GLYPH)
 PangoGlyph pango_fc_font_get_unknown_glyph (PangoFcFont      *font,
                                             gunichar          wc);
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index eed0960a..bd15bf2a 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -166,8 +166,9 @@ struct _PangoFcFontFaceData
   int id;            /* needed to handle TTC files with multiple faces */
 
   /* Data */
-  FcPattern *pattern;	/* Referenced pattern that owns filename */
+  FcPattern *pattern;  /* Referenced pattern that owns filename */
   PangoCoverage *coverage;
+  PangoLanguage **languages;
 
   hb_face_t *hb_face;
 };
@@ -307,6 +308,8 @@ pango_fc_font_face_data_free (PangoFcFontFaceData *data)
   if (data->coverage)
     pango_coverage_unref (data->coverage);
 
+  g_free (data->languages);
+
   hb_face_destroy (data->hb_face);
 
   g_slice_free (PangoFcFontFaceData, data);
@@ -2245,6 +2248,57 @@ _pango_fc_font_map_fc_to_coverage (FcCharSet *charset)
   return (PangoCoverage *)coverage;
 }
 
+static PangoLanguage **
+_pango_fc_font_map_fc_to_languages (FcLangSet *langset)
+{
+  FcStrSet *strset;
+  FcStrList *list;
+  FcChar8 *s;
+  GArray *langs;
+
+  langs = g_array_new (TRUE, FALSE, sizeof (PangoLanguage *));
+
+  strset = FcLangSetGetLangs (langset);
+  list = FcStrListCreate (strset);
+
+  FcStrListFirst (list);
+  while ((s = FcStrListNext (list)))
+    {
+      PangoLanguage *l = pango_language_from_string ((const char *)s);
+      g_array_append_val (langs, l);
+    }
+
+  FcStrListDone (list);
+  FcStrSetDestroy (strset);
+
+  return (PangoLanguage **) g_array_free (langs, FALSE);
+}
+
+PangoLanguage **
+_pango_fc_font_map_get_languages (PangoFcFontMap *fcfontmap,
+                                  PangoFcFont    *fcfont)
+{
+  PangoFcFontFaceData *data;
+  FcLangSet *langset;
+
+  data = pango_fc_font_map_get_font_face_data (fcfontmap, fcfont->font_pattern);
+  if (G_UNLIKELY (!data))
+    return NULL;
+
+  if (G_UNLIKELY (data->languages == NULL))
+    {
+      /*
+       * Pull the languages out of the pattern, this
+       * doesn't require loading the font
+       */
+      if (FcPatternGetLangSet (fcfont->font_pattern, FC_LANG, 0, &langset) != FcResultMatch)
+        return NULL;
+
+      data->languages = _pango_fc_font_map_fc_to_languages (langset);
+    }
+
+  return data->languages;
+}
 /**
  * pango_fc_font_map_create_context:
  * @fcfontmap: a #PangoFcFontMap
diff --git a/pango/pangofc-private.h b/pango/pangofc-private.h
index 27b96df4..7e216ed9 100644
--- a/pango/pangofc-private.h
+++ b/pango/pangofc-private.h
@@ -78,6 +78,9 @@ _PANGO_EXTERN
 PangoFontMetrics *pango_fc_font_create_base_metrics_for_context (PangoFcFont   *font,
 								 PangoContext  *context);
 
+PangoLanguage **_pango_fc_font_map_get_languages (PangoFcFontMap *fcfontmap,
+                                                  PangoFcFont    *fcfont);
+
 G_END_DECLS
 
 #endif /* __PANGOFC_PRIVATE_H__ */