[pango] Bug 547671 - Add pango_fc_font_map_[gs]et_fc_config()

[Behdad Esfahbod <behdad src gnome org>]

commit 4ad91ff6754f99d8c4f3ca1e09e2cc3005edb857
Author: Behdad Esfahbod <behdad behdad org>
Date:   Thu Apr 30 18:00:14 2015 -0400

    Bug 547671 - Add pango_fc_font_map_[gs]et_fc_config()

 docs/pango-sections.txt |    2 +
 pango/pangofc-fontmap.c |   73 +++++++++++++++++++++++++++++++++++++++++++---
 pango/pangofc-fontmap.h |    6 ++++
 pango/pangoft2.c        |    2 +-
 pango/pangoft2.def      |    2 +
 5 files changed, 79 insertions(+), 6 deletions(-)
---
diff --git a/docs/pango-sections.txt b/docs/pango-sections.txt
index d8ac758..96cdd3c 100644
--- a/docs/pango-sections.txt
+++ b/docs/pango-sections.txt
@@ -916,6 +916,8 @@ pango_fc_font_map_add_decoder_find_func
 pango_fc_font_map_find_decoder
 pango_fc_font_map_cache_clear
 pango_fc_font_map_shutdown
+pango_fc_font_map_set_fc_config
+pango_fc_font_map_get_fc_config
 pango_fc_font_description_from_pattern
 PANGO_FC_FONT_FEATURES
 PANGO_FC_GRAVITY
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index 3fcc0c5..d4ff2dd 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -150,6 +150,8 @@ struct _PangoFcFontMapPrivate
   GSList *findfuncs;
 
   guint closed : 1;
+
+  FcConfig *fc_config;
 };
 
 struct _PangoFcFontFaceData
@@ -780,7 +782,7 @@ pango_fc_patterns_get_font_pattern (PangoFcPatterns *pats, int i, gboolean *prep
       FcResult result;
       if (!pats->match && !pats->fontset)
         {
-         pats->match = FcFontMatch (NULL, pats->pattern, &result);
+         pats->match = FcFontMatch (pats->fontmap->priv->fc_config, pats->pattern, &result);
 #ifdef FC_PATTERN
          /* The FC_PATTERN element, which points back to our the original
           * pattern defeats our hash tables.
@@ -800,7 +802,7 @@ pango_fc_patterns_get_font_pattern (PangoFcPatterns *pats, int i, gboolean *prep
       if (!pats->fontset)
         {
          FcResult result;
-         pats->fontset = FcFontSort (NULL, pats->pattern, FcTrue, NULL, &result);
+         pats->fontset = FcFontSort (pats->fontmap->priv->fc_config, pats->pattern, FcTrue, NULL, &result);
          if (pats->match)
            {
              FcPatternDestroy (pats->match);
@@ -1312,7 +1314,7 @@ pango_fc_font_map_list_families (PangoFontMap      *fontmap,
        * the same family have different spacing values */
       GHashTable *temp_family_hash;
 
-      fontset = FcFontList (NULL, pat, os);
+      fontset = FcFontList (priv->fc_config, pat, os);
 
       FcPatternDestroy (pat);
       FcObjectSetDestroy (os);
@@ -1809,6 +1811,63 @@ pango_fc_font_map_cache_clear (PangoFcFontMap *fcfontmap)
   pango_font_map_changed (PANGO_FONT_MAP (fcfontmap));
 }
 
+/**
+ * pango_fc_font_map_set_fc_config:
+ * @fcfontmap: a #PangoFcFontMap
+ * @fcconfig: (nullable) a #FcConfig, or %NULL
+ *
+ * Set the FcConfig for this font map to use.  The default value
+ * is %NULL, which causes Fontconfig to use its global "current config".
+ * You can create a new FcConfig object and use this API to attach it
+ * to a font map.
+ *
+ * This is particularly useful for example, if you want to use application
+ * fonts with Pango.  For that, you would create a fresh FcConfig, add your
+ * app fonts to it, and attach it to a new Pango font map.
+ *
+ * This function acquires a reference to the FcConfig object; the caller
+ * does NOT need to retain a reference.
+ *
+ * Since: 1.38
+ **/
+void
+pango_fc_font_map_set_fc_config (PangoFcFontMap *fcfontmap,
+                                FcConfig       *fcconfig)
+{
+  FcConfig *oldconfig;
+
+  g_return_if_fail (PANGO_IS_FC_FONT_MAP (fcfontmap));
+
+  oldconfig = fcfontmap->priv->fc_config;
+
+  if (fcconfig)
+    FcConfigReference (fcconfig);
+
+  fcfontmap->priv->fc_config = fcconfig;
+
+  if (oldconfig)
+    FcConfigDestroy (oldconfig);
+}
+
+/**
+ * pango_fc_font_map_get_fc_config:
+ * @fcfontmap: a #PangoFcFontMap
+ *
+ * Fetches FcConfig attached to a font map.  See pango_fc_font_map_set_fc_config().
+ *
+ * Returns: (nullable): the #FcConfig object attached to @fcfontmap, which
+ *          might be %NULL.
+ *
+ * Since: 1.38
+ **/
+FcConfig *
+pango_fc_font_map_get_fc_config (PangoFcFontMap *fcfontmap)
+{
+  g_return_val_if_fail (PANGO_IS_FC_FONT_MAP (fcfontmap), NULL);
+
+  return fcfontmap->priv->fc_config;
+}
+
 static PangoFcFontFaceData *
 pango_fc_font_map_get_font_face_data (PangoFcFontMap *fcfontmap,
                                      FcPattern      *font_pattern)
@@ -2238,6 +2297,7 @@ pango_fc_face_describe (PangoFontFace *face)
   FcResult res;
   FcPattern *match_pattern;
   FcPattern *result_pattern;
+  FcConfig *fc_config = NULL;
 
   if (G_UNLIKELY (!fcfamily))
     return pango_font_description_new ();
@@ -2264,7 +2324,10 @@ pango_fc_face_describe (PangoFontFace *face)
   FcConfigSubstitute (NULL, match_pattern, FcMatchPattern);
   FcDefaultSubstitute (match_pattern);
 
-  result_pattern = FcFontMatch (NULL, match_pattern, &res);
+  if (fcface->family && fcface->family->fontmap)
+    fc_config = fcface->family->fontmap->priv->fc_config;
+
+  result_pattern = FcFontMatch (fc_config, match_pattern, &res);
   if (result_pattern)
     {
       desc = pango_fc_font_description_from_pattern (result_pattern, FALSE);
@@ -2484,7 +2547,7 @@ pango_fc_family_list_faces (PangoFontFamily  *family,
          PangoFcFace **faces;
          gint num = 0;
 
-         fontset = FcFontList (NULL, pat, os);
+         fontset = FcFontList (priv->fc_config, pat, os);
 
          FcPatternDestroy (pat);
          FcObjectSetDestroy (os);
diff --git a/pango/pangofc-fontmap.h b/pango/pangofc-fontmap.h
index fee5faa..3f81348 100644
--- a/pango/pangofc-fontmap.h
+++ b/pango/pangofc-fontmap.h
@@ -197,6 +197,12 @@ GType pango_fc_font_map_get_type (void) G_GNUC_CONST;
 
 void           pango_fc_font_map_cache_clear    (PangoFcFontMap *fcfontmap);
 
+void
+pango_fc_font_map_set_fc_config (PangoFcFontMap *fcfontmap,
+                                FcConfig       *fcconfig);
+FcConfig *
+pango_fc_font_map_get_fc_config (PangoFcFontMap *fcfontmap);
+
 /**
  * PangoFcDecoderFindFunc:
  * @pattern: a fully resolved #FcPattern specifying the font on the system
diff --git a/pango/pangoft2.c b/pango/pangoft2.c
index 186424d..ec47685 100644
--- a/pango/pangoft2.c
+++ b/pango/pangoft2.c
@@ -110,7 +110,7 @@ load_fallback_face (PangoFT2Font *ft2font,
 
   _pango_ft2_font_map_default_substitute ((PangoFcFontMap *)fcfont->fontmap, sans);
 
-  matched = FcFontMatch (NULL, sans, &result);
+  matched = FcFontMatch (pango_fc_font_map_get_fc_config (fcfont->fontmap), sans, &result);
 
   if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
     goto bail1;
diff --git a/pango/pangoft2.def b/pango/pangoft2.def
index f2082cc..1f5ec90 100644
--- a/pango/pangoft2.def
+++ b/pango/pangoft2.def
@@ -18,7 +18,9 @@ EXPORTS
        pango_fc_font_map_cache_clear
        pango_fc_font_map_create_context
        pango_fc_font_map_find_decoder
+       pango_fc_font_map_get_fc_config
        pango_fc_font_map_get_type
+       pango_fc_font_map_set_fc_config
        pango_fc_font_map_shutdown
        pango_fc_font_unlock_face
        pango_fc_fontset_key_get_absolute_size