[metacity] libmetacity: own created title font descriptions

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 4c6a8b38970581e7979bfc344122bbfdb9627fee
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Jun 6 18:12:48 2016 +0300

    libmetacity: own created title font descriptions

 libmetacity/meta-theme.c           |   41 +++++++++++++++++++++++++++++++----
 libmetacity/meta-theme.h           |    2 +-
 src/ui/frames.c                    |    5 +--
 src/ui/ui.c                        |    3 +-
 theme-viewer/theme-viewer-window.c |    6 +---
 5 files changed, 42 insertions(+), 15 deletions(-)
---
diff --git a/libmetacity/meta-theme.c b/libmetacity/meta-theme.c
index 056dc3f..3f66add 100644
--- a/libmetacity/meta-theme.c
+++ b/libmetacity/meta-theme.c
@@ -43,6 +43,8 @@ struct _MetaTheme
   GHashTable           *variants;
 
   PangoContext         *context;
+
+  GHashTable           *font_descs;
 };
 
 enum
@@ -163,6 +165,8 @@ meta_theme_dispose (GObject *object)
 
   g_clear_object (&theme->context);
 
+  g_clear_pointer (&theme->font_descs, g_hash_table_destroy);
+
   G_OBJECT_CLASS (meta_theme_parent_class)->dispose (object);
 }
 
@@ -240,6 +244,9 @@ meta_theme_init (MetaTheme *theme)
 
   theme->variants = g_hash_table_new_full (g_str_hash, g_str_equal,
                                            g_free, g_object_unref);
+
+  theme->font_descs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
+                                             (GDestroyNotify) pango_font_description_free);
 }
 
 /**
@@ -294,6 +301,7 @@ meta_theme_invalidate (MetaTheme *theme)
 {
   g_hash_table_remove_all (theme->variants);
   g_clear_object (&theme->context);
+  g_hash_table_remove_all (theme->font_descs);
 }
 
 void
@@ -315,6 +323,8 @@ meta_theme_set_titlebar_font (MetaTheme                  *theme,
 {
   pango_font_description_free (theme->titlebar_font);
   theme->titlebar_font = pango_font_description_copy (titlebar_font);
+
+  g_hash_table_remove_all (theme->font_descs);
 }
 
 MetaFrameStyle *
@@ -435,15 +445,34 @@ meta_theme_create_title_layout (MetaTheme   *theme,
   return layout;
 }
 
+/**
+ * meta_theme_get_title_font_desc:
+ * @theme: a #MetaTheme
+ * @variant: (nullable): theme variant
+ * @type: frame type
+ * @flags: frame flags
+ *
+ * Returns: (transfer none): the #PangoFontDescription
+ */
 PangoFontDescription*
-meta_theme_create_font_desc (MetaTheme      *theme,
-                             const gchar    *variant,
-                             MetaFrameType   type,
-                             MetaFrameFlags  flags)
+meta_theme_get_title_font_desc (MetaTheme      *theme,
+                                const gchar    *variant,
+                                MetaFrameType   type,
+                                MetaFrameFlags  flags)
 {
+  gchar *key;
+  PangoFontDescription *font_desc;
   MetaStyleInfo *style_info;
   GtkStyleContext *context;
-  PangoFontDescription *font_desc;
+
+  key = g_strdup_printf ("%s_%d_%x", variant ? variant : "default", type, flags);
+  font_desc = g_hash_table_lookup (theme->font_descs, key);
+
+  if (font_desc != NULL)
+    {
+      g_free (key);
+      return font_desc;
+    }
 
   style_info = meta_theme_get_style_info (theme, variant);
   context = meta_style_info_get_style (style_info, META_STYLE_ELEMENT_TITLE);
@@ -461,6 +490,8 @@ meta_theme_create_font_desc (MetaTheme      *theme,
 
   font_desc_apply_scale (font_desc, theme, type, flags);
 
+  g_hash_table_insert (theme->font_descs, key, font_desc);
+
   return font_desc;
 }
 
diff --git a/libmetacity/meta-theme.h b/libmetacity/meta-theme.h
index d3217db..69f778b 100644
--- a/libmetacity/meta-theme.h
+++ b/libmetacity/meta-theme.h
@@ -168,7 +168,7 @@ MetaFrameStyle       *meta_theme_get_frame_style           (MetaTheme
 PangoLayout          *meta_theme_create_title_layout       (MetaTheme                   *theme,
                                                             const gchar                 *title);
 
-PangoFontDescription *meta_theme_create_font_desc          (MetaTheme                   *theme,
+PangoFontDescription *meta_theme_get_title_font_desc       (MetaTheme                   *theme,
                                                             const gchar                 *variant,
                                                             MetaFrameType                type,
                                                             MetaFrameFlags               flags);
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 1d99456..aaf03a5 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -443,8 +443,8 @@ meta_frames_ensure_layout (MetaFrames  *frames,
       int size;
 
       frame->text_layout = meta_theme_create_title_layout (theme, frame->title);
-      font_desc = meta_theme_create_font_desc (theme, frame->theme_variant,
-                                               type, flags);
+      font_desc = meta_theme_get_title_font_desc (theme, frame->theme_variant,
+                                                  type, flags);
 
       size = pango_font_description_get_size (font_desc);
 
@@ -464,7 +464,6 @@ meta_frames_ensure_layout (MetaFrames  *frames,
         }
 
       pango_layout_set_font_description (frame->text_layout, font_desc);
-      pango_font_description_free (font_desc);
     }
 }
 
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 2fa3012..3175269 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -688,9 +688,8 @@ meta_ui_theme_get_frame_borders (MetaUI           *ui,
   theme = meta_ui_get_theme ();
   theme_variant = NULL;
 
-  font_desc = meta_theme_create_font_desc (theme, theme_variant, type, flags);
+  font_desc = meta_theme_get_title_font_desc (theme, theme_variant, type, flags);
   text_height = meta_theme_get_title_height (theme, font_desc);
-  pango_font_description_free (font_desc);
 
   meta_theme_get_frame_borders (theme, theme_variant, type,
                                 text_height, flags, borders);
diff --git a/theme-viewer/theme-viewer-window.c b/theme-viewer/theme-viewer-window.c
index 11af971..ee39e5b 100644
--- a/theme-viewer/theme-viewer-window.c
+++ b/theme-viewer/theme-viewer-window.c
@@ -241,8 +241,8 @@ update_title_layout (ThemeViewerWindow *window)
   gint height;
 
   layout = meta_theme_create_title_layout (window->theme, "Metacity Theme Viewer");
-  font_desc = meta_theme_create_font_desc (window->theme, window->theme_variant,
-                                           window->frame_type, window->frame_flags);
+  font_desc = meta_theme_get_title_font_desc (window->theme, window->theme_variant,
+                                              window->frame_type, window->frame_flags);
 
   height = meta_theme_get_title_height (window->theme, font_desc);
 
@@ -253,8 +253,6 @@ update_title_layout (ThemeViewerWindow *window)
 
   window->title_layout = layout;
   window->title_height = height;
-
-  pango_font_description_free (font_desc);
 }
 
 static void