[pango: 1/2] pangowin32: try harder to load a font

[Matthias Clasen <matthiasc src gnome org>]

commit cade006c9ef7cbbd1aefbf5c12a2c74151f031c8
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Mon Apr 11 22:10:30 2022 +0200

    pangowin32: try harder to load a font
    
    load_fontset() in pangowin32 has various fallback code in case
    no font is found, but load_font() doesn't and just returns NULL
    in more cases.
    
    I saw that the other backends like fc and coretext just call
    load_fontset() in load_font() and return the first one.
    
    This copies this strategy to the win32 backend.

 pango/pangowin32-fontmap.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)
---
diff --git a/pango/pangowin32-fontmap.c b/pango/pangowin32-fontmap.c
index 43cffc37..4e6342a5 100644
--- a/pango/pangowin32-fontmap.c
+++ b/pango/pangowin32-fontmap.c
@@ -83,6 +83,9 @@ static void       pango_win32_font_map_finalize      (GObject
 static PangoFont *pango_win32_font_map_load_font     (PangoFontMap                 *fontmap,
                                                       PangoContext                 *context,
                                                       const PangoFontDescription   *description);
+static PangoFont *pango_win32_font_map_real_load_font  (PangoFontMap                 *fontmap,
+                                                        PangoContext                 *context,
+                                                        const PangoFontDescription   *description);
 static PangoFontset *pango_win32_font_map_load_fontset (PangoFontMap               *fontmap,
                                                         PangoContext                 *context,
                                                         const PangoFontDescription   *desc,
@@ -794,7 +797,7 @@ _pango_win32_font_map_class_init (PangoWin32FontMapClass *class)
 
   class->find_font = pango_win32_font_map_real_find_font;
   object_class->finalize = pango_win32_font_map_finalize;
-  fontmap_class->load_font = pango_win32_font_map_load_font;
+  fontmap_class->load_font = pango_win32_font_map_real_load_font;
   /* we now need a load_fontset implementation for the Win32 backend */
   fontmap_class->load_fontset = pango_win32_font_map_load_fontset;
   fontmap_class->list_families = pango_win32_font_map_list_families;
@@ -1011,6 +1014,46 @@ pango_win32_get_font_family (PangoWin32FontMap *win32fontmap,
   return win32family;
 }
 
+static gboolean
+get_first_font (PangoFontset *fontset G_GNUC_UNUSED,
+                PangoFont    *font,
+                gpointer      data)
+{
+  *(PangoFont **)data = font;
+
+  return TRUE;
+}
+
+static PangoFont *
+pango_win32_font_map_real_load_font (PangoFontMap               *fontmap,
+                                     PangoContext               *context,
+                                     const PangoFontDescription *description)
+{
+  PangoLanguage *language;
+  PangoFontset *fontset;
+  PangoFont *font = NULL;
+
+  if (context)
+    language = pango_context_get_language (context);
+  else
+    language = NULL;
+
+  fontset = pango_font_map_load_fontset (fontmap, context,
+                                         description, language);
+
+  if (fontset)
+    {
+      pango_fontset_foreach (fontset, get_first_font, &font);
+
+      if (font)
+        g_object_ref (font);
+
+      g_object_unref (fontset);
+    }
+
+  return font;
+}
+
 static PangoFont *
 pango_win32_font_map_load_font (PangoFontMap               *fontmap,
                                 PangoContext               *context,