Cut out the meat of pango_fc_font_get_metrics_for_context() and export it

2005-08-15  Owen Taylor  <otaylor@redhat.com>

        * pango/pangofc-font.c (pango_fc_font_create_metrics_for_context)
        pango/pangofc-private.h  pango/pangocairo-fcfcont.c: Cut out the meat of
        pango_fc_font_get_metrics_for_context() and export it (privately),
        so that PangoCairoFcFont can create a variant that sets the font
        options on the context it creates. (#311522)

3 files changed, 108 insertions, 33 deletions

diff --git a/pango/pangocairo-fcfont.c b/pango/pangocairo-fcfont.c
index c3e99c13..eb6825ef 100644
--- a/pango/pangocairo-fcfont.c
+++ b/pango/pangocairo-fcfont.c
@@ -30,6 +30,7 @@
 #include "pangocairo-private.h"
 #include "pangocairo-fc.h"
 #include "pangofc-private.h"
+#include "pango-utils.h"
 
 #define PANGO_TYPE_CAIRO_FC_FONT           (pango_cairo_fc_font_get_type ())
 #define PANGO_CAIRO_FC_FONT(object)        (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFont))
@@ -242,6 +243,57 @@ pango_cairo_fc_font_get_glyph_extents (PangoFont      *font,
     *logical_rect = info->logical_rect;
 }
 
+/* This function is cut-and-pasted from pangocairo-fcfont.c - it might be
+ * better to add a virtual fcfont->create_context (font).
+ */
+static PangoFontMetrics *
+pango_cairo_fc_font_get_metrics (PangoFont     *font,
+				 PangoLanguage *language)
+{
+  PangoFcFont *fcfont = PANGO_FC_FONT (font);
+  PangoCairoFcFont *cffont = PANGO_CAIRO_FC_FONT (font);
+  PangoFcMetricsInfo *info = NULL; /* Quiet gcc */
+  GSList *tmp_list;      
+
+  const char *sample_str = pango_language_get_sample_string (language);
+  
+  tmp_list = fcfont->metrics_by_lang;
+  while (tmp_list)
+    {
+      info = tmp_list->data;
+      
+      if (info->sample_str == sample_str)    /* We _don't_ need strcmp */
+	break;
+
+      tmp_list = tmp_list->next;
+    }
+
+  if (!tmp_list)
+    {
+      PangoContext *context;
+
+      if (!fcfont->fontmap)
+	return pango_font_metrics_new ();
+
+      info = g_new0 (PangoFcMetricsInfo, 1);
+      
+      fcfont->metrics_by_lang = g_slist_prepend (fcfont->metrics_by_lang, 
+						 info);
+	
+      info->sample_str = sample_str;
+
+      context = pango_fc_font_map_create_context (PANGO_FC_FONT_MAP (fcfont->fontmap));
+      pango_context_set_language (context, language);
+      pango_cairo_context_set_font_options (context, cffont->options);
+
+      info->metrics = pango_fc_font_create_metrics_for_context (fcfont, context);
+
+      g_object_unref (context);
+    }
+
+  return pango_font_metrics_ref (info->metrics);
+}
+
 static FT_Face
 pango_cairo_fc_font_lock_face (PangoFcFont *font)
 {
@@ -293,6 +345,7 @@ pango_cairo_fc_font_class_init (PangoCairoFcFontClass *class)
   object_class->finalize = pango_cairo_fc_font_finalize;
   
   font_class->get_glyph_extents = pango_cairo_fc_font_get_glyph_extents;
+  font_class->get_metrics = pango_cairo_fc_font_get_metrics;
 
   fc_font_class->lock_face = pango_cairo_fc_font_lock_face;
   fc_font_class->unlock_face = pango_cairo_fc_font_unlock_face;
diff --git a/pango/pangofc-font.c b/pango/pangofc-font.c
index 84a55eb4..21ddf8d0 100644
--- a/pango/pangofc-font.c
+++ b/pango/pangofc-font.c
@@ -30,14 +30,6 @@
 
 #include FT_TRUETYPE_TABLES_H
 
-typedef struct _PangoFcMetricsInfo  PangoFcMetricsInfo;
-
-struct _PangoFcMetricsInfo
-{
-  const char       *sample_str;
-  PangoFontMetrics *metrics;
-};
-
 enum {
   PROP_0,
   PROP_PATTERN
@@ -402,6 +394,40 @@ max_glyph_width (PangoLayout *layout)
   return max_width;
 }
 
+PangoFontMetrics *
+pango_fc_font_create_metrics_for_context (PangoFcFont   *fcfont,
+					  PangoContext  *context)
+{
+  PangoFontMetrics *metrics;
+  PangoLayout *layout;
+  PangoRectangle extents;
+  PangoLanguage *language = pango_context_get_language (context);
+  const char *sample_str = pango_language_get_sample_string (language);
+  
+  metrics = pango_font_metrics_new ();
+  
+  get_face_metrics (fcfont, metrics);
+  
+  layout = pango_layout_new (context);
+  pango_layout_set_font_description (layout, fcfont->description);
+  
+  pango_layout_set_text (layout, sample_str, -1);      
+  pango_layout_get_extents (layout, NULL, &extents);
+  
+  metrics->approximate_char_width = 
+    extents.width / g_utf8_strlen (sample_str, -1);
+
+  pango_layout_set_text (layout, "0123456789", -1);
+  metrics->approximate_digit_width = max_glyph_width (layout);
+
+  g_object_unref (layout);
+
+  return metrics;
+}		    
+
+/* This function is cut-and-pasted into pangocairo-fcfont.c - it might be
+ * better to add a virtual fcfont->create_context (font).
+ */
 static PangoFontMetrics *
 pango_fc_font_get_metrics (PangoFont     *font,
                            PangoLanguage *language)
@@ -425,39 +451,24 @@ pango_fc_font_get_metrics (PangoFont     *font,
 
   if (!tmp_list)
     {
-      PangoLayout *layout;
-      PangoRectangle extents;
       PangoContext *context;
 
+      if (!fcfont->fontmap)
+	return pango_font_metrics_new ();
+
       info = g_new0 (PangoFcMetricsInfo, 1);
+      
       fcfont->metrics_by_lang = g_slist_prepend (fcfont->metrics_by_lang, 
 						 info);
+	
+      info->sample_str = sample_str;
 
-      if (fcfont->fontmap)
-	{
-	  info->sample_str = sample_str;
-	  info->metrics = pango_font_metrics_new ();
-	  
-	  get_face_metrics (fcfont, info->metrics);
-
-	  context = pango_fc_font_map_create_context (PANGO_FC_FONT_MAP (fcfont->fontmap));
-	  pango_context_set_language (context, language);
-	  
-	  layout = pango_layout_new (context);
-	  pango_layout_set_font_description (layout, fcfont->description);
-
-	  pango_layout_set_text (layout, sample_str, -1);      
-	  pango_layout_get_extents (layout, NULL, &extents);
-      
-	  info->metrics->approximate_char_width = 
-	    extents.width / g_utf8_strlen (sample_str, -1);
+      context = pango_fc_font_map_create_context (PANGO_FC_FONT_MAP (fcfont->fontmap));
+      pango_context_set_language (context, language);
 
-          pango_layout_set_text (layout, "0123456789", -1);
-          info->metrics->approximate_digit_width = max_glyph_width (layout);
+      info->metrics = pango_fc_font_create_metrics_for_context (fcfont, context);
 
-	  g_object_unref (layout);
-	  g_object_unref (context);
-	}
+      g_object_unref (context);
     }
 
   return pango_font_metrics_ref (info->metrics);
diff --git a/pango/pangofc-private.h b/pango/pangofc-private.h
index 751a87f6..c0be7648 100644
--- a/pango/pangofc-private.h
+++ b/pango/pangofc-private.h
@@ -27,6 +27,14 @@
 
 G_BEGIN_DECLS
 
+typedef struct _PangoFcMetricsInfo  PangoFcMetricsInfo;
+
+struct _PangoFcMetricsInfo
+{
+  const char       *sample_str;
+  PangoFontMetrics *metrics;
+};
+
 #define PANGO_SCALE_26_6 (PANGO_SCALE / (1<<6))
 #define PANGO_PIXELS_26_6(d)				\
   (((d) >= 0) ?						\
@@ -52,6 +60,9 @@ void            pango_fc_font_get_raw_extents    (PangoFcFont    *font,
 						  PangoRectangle *ink_rect,
 						  PangoRectangle *logical_rect);
 
+PangoFontMetrics *pango_fc_font_create_metrics_for_context (PangoFcFont   *font,
+							    PangoContext  *context);
+
 G_END_DECLS
 
 #endif /* __PANGOFC_PRIVATE_H__ */