Add new function _gdk_screen_get_font_map() and have one fontmap per

2006-05-21  Behdad Esfahbod  <behdad@gnome.org>

        * gdk/gdkinternals.h:
        * gdk/gdkscreen.c (gdk_screen_class_init), (gdk_screen_finalize),
        (update_fontmap_resolution), (gdk_screen_set_resolution):  Add new
        function _gdk_screen_get_font_map() and have one fontmap per screen,
        with the correct resolution set on it.

        * gdk/gdkpango.c (gdk_pango_context_get_for_screen): Use
        _gdk_screen_get_font_map() instead of setting resolution on the
        PangoCairoContext.  (#342529)

1 files changed, 63 insertions, 0 deletions

diff --git a/gdk/gdkscreen.c b/gdk/gdkscreen.c
index 986f9f5525..000ca5e85b 100644
--- a/gdk/gdkscreen.c
+++ b/gdk/gdkscreen.c
@@ -25,10 +25,23 @@
 #include "gdk.h"		/* For gdk_rectangle_intersect() */
 #include "gdkcolor.h"
 #include "gdkwindow.h"
+#include "gdkinternals.h"
 #include "gdkscreen.h"
 #include "gdkintl.h"
 #include "gdkalias.h"
 
+
+#define GDK_SCREEN_GET_PRIVATE(o)  \
+    (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDK_TYPE_SCREEN, GdkScreenPrivate))
+
+typedef struct _GdkScreenPrivate GdkScreenPrivate;
+
+struct _GdkScreenPrivate
+{
+  PangoFontMap *fontmap;
+};
+
+
 static void gdk_screen_dispose      (GObject        *object);
 static void gdk_screen_finalize     (GObject        *object);
 static void gdk_screen_set_property (GObject        *object,
@@ -124,6 +137,8 @@ gdk_screen_class_init (GdkScreenClass *klass)
 		  g_cclosure_marshal_VOID__VOID,
 		  G_TYPE_NONE,
 		  0);
+
+  g_type_class_add_private (klass, sizeof (GdkScreenPrivate));
 }
 
 static void
@@ -160,10 +175,14 @@ static void
 gdk_screen_finalize (GObject *object)
 {
   GdkScreen *screen = GDK_SCREEN (object);
+  GdkScreenPrivate *priv = GDK_SCREEN_GET_PRIVATE (screen);
 
   if (screen->font_options)
       cairo_font_options_destroy (screen->font_options);
 
+  if (priv->fontmap)
+      g_object_unref (priv->fontmap);
+
   G_OBJECT_CLASS (gdk_screen_parent_class)->finalize (object);
 }
 
@@ -369,6 +388,48 @@ gdk_screen_height_mm (void)
   return gdk_screen_get_height_mm (gdk_screen_get_default ());
 }
 
+static void
+update_fontmap_resolution (GdkScreen                  *screen)
+{
+  GdkScreenPrivate *priv = GDK_SCREEN_GET_PRIVATE (screen);
+  double dpi = screen->resolution;
+
+  if (dpi < 0)
+    dpi = 96.;
+
+  if (priv->fontmap)
+    pango_cairo_font_map_set_resolution (priv->fontmap, dpi);
+}
+
+/**
+ * _gdk_screen_get_font_map:
+ * @screen: a #GdkScreen
+ *
+ * Gets the Pango fontmap for this screen that is used to create
+ * #PangoContext, with the right resolution set on it.
+ *
+ * Return value: the fontmap.
+ *
+ * Since: 2.10
+ **/
+PangoFontMap *
+_gdk_screen_get_font_map (GdkScreen *screen)
+{
+  GdkScreenPrivate *priv;
+  
+  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
+
+  priv = GDK_SCREEN_GET_PRIVATE (screen);
+
+  if (G_UNLIKELY (!priv->fontmap))
+    {
+      priv->fontmap = pango_cairo_font_map_new ();
+      update_fontmap_resolution (screen);
+    }
+    
+  return priv->fontmap;
+}
+
 /**
  * gdk_screen_set_font_options:
  * @screen: a #GdkScreen
@@ -448,6 +509,8 @@ gdk_screen_set_resolution (GdkScreen *screen,
       {
 	screen->resolution = dpi;
 
+	update_fontmap_resolution (screen);
+
 	g_object_notify (G_OBJECT (screen), "resolution");
       }
 }