New function that inserts before other attributes with matching start

Sun Jul  2 17:59:56 2000  Owen Taylor  <otaylor@redhat.com>

	* pango/pango-attributes.[ch] (pango_attr_list_insert_before): New
	function that inserts before other attributes with matching
	start index.

	* pango/pango-layout.[ch] (pango_layout_set_font_description): Add
	the ability to set a default font description on the layout, overriding
	the font description from the context.

4 files changed, 142 insertions, 46 deletions

diff --git a/pango/pango-attributes.c b/pango/pango-attributes.c
index 695fa0f8..a688cab6 100644
--- a/pango/pango-attributes.c
+++ b/pango/pango-attributes.c
@@ -649,31 +649,21 @@ pango_attr_list_copy (PangoAttrList *list)
   return new;
 }
 
-/**
- * pango_attr_list_insert:
- * @list: a #PangoAttrList
- * @attr: the attribute to insert. Ownership of this value is
- *        assumed by the list.
- * 
- * Insert the given attribute into the #PangoAttrList. It will
- * be inserted after all other attributes with a matching
- * @start_index.
- **/
-void
-pango_attr_list_insert (PangoAttrList  *list,
-			PangoAttribute *attr)
+static void
+pango_attr_list_insert_internal (PangoAttrList  *list,
+				 PangoAttribute *attr,
+				 gboolean        before)
 {
   GSList *tmp_list, *prev, *link;
   gint start_index = attr->start_index;
   
-  g_return_if_fail (list != NULL);
-
   if (!list->attributes)
     {
       list->attributes = g_slist_prepend (NULL, attr);
       list->attributes_tail = list->attributes;
     }
-  else if (((PangoAttribute *)list->attributes_tail->data)->start_index <= start_index)
+  else if (((PangoAttribute *)list->attributes_tail->data)->start_index < start_index ||
+	   (!before && ((PangoAttribute *)list->attributes_tail->data)->start_index == start_index))
     {
       g_slist_append (list->attributes_tail, attr);
     }
@@ -685,7 +675,8 @@ pango_attr_list_insert (PangoAttrList  *list,
 	{
 	  PangoAttribute *tmp_attr = tmp_list->data;
 	  
-	  if (tmp_attr->start_index > start_index)
+	  if (tmp_attr->start_index > start_index ||
+	      (before && tmp_attr->start_index == start_index))
 	    {
 	      link = g_slist_alloc ();
 	      link->next = tmp_list;
@@ -707,6 +698,46 @@ pango_attr_list_insert (PangoAttrList  *list,
 }
 
 /**
+ * pango_attr_list_insert:
+ * @list: a #PangoAttrList
+ * @attr: the attribute to insert. Ownership of this value is
+ *        assumed by the list.
+ * 
+ * Insert the given attribute into the #PangoAttrList. It will
+ * be inserted after all other attributes with a matching
+ * @start_index.
+ **/
+void
+pango_attr_list_insert (PangoAttrList  *list,
+			PangoAttribute *attr)
+{
+  g_return_if_fail (list != NULL);
+  g_return_if_fail (attr != NULL);
+
+  pango_attr_list_insert_internal (list, attr, FALSE);
+}
+
+/**
+ * pango_attr_list_insert_before:
+ * @list: a #PangoAttrList
+ * @attr: the attribute to insert. Ownership of this value is
+ *        assumed by the list.
+ * 
+ * Insert the given attribute into the #PangoAttrList. It will
+ * be inserted before all other attributes with a matching
+ * @start_index.
+ **/
+void
+pango_attr_list_insert_before (PangoAttrList  *list,
+			       PangoAttribute *attr)
+{
+  g_return_if_fail (list != NULL);
+  g_return_if_fail (attr != NULL);
+
+  pango_attr_list_insert_internal (list, attr, TRUE);
+}
+
+/**
  * pango_attr_list_change:
  * @list: a #PangoAttrList
  * @attr: the attribute to insert. Ownership of this value is
diff --git a/pango/pango-attributes.h b/pango/pango-attributes.h
index 3e34d011..3670163e 100644
--- a/pango/pango-attributes.h
+++ b/pango/pango-attributes.h
@@ -128,15 +128,17 @@ PangoAttribute *pango_attr_underline_new     (PangoUnderline              underl
 PangoAttribute *pango_attr_strikethrough_new (gboolean                    strikethrough);
 PangoAttribute *pango_attr_rise_new          (int                         rise);
 
-PangoAttrList *     pango_attr_list_new          (void);
-void                pango_attr_list_ref          (PangoAttrList  *list);
-void                pango_attr_list_unref        (PangoAttrList  *list);
-PangoAttrList *     pango_attr_list_copy         (PangoAttrList  *list);
-void                pango_attr_list_insert       (PangoAttrList  *list,
+PangoAttrList *    pango_attr_list_new           (void);
+void               pango_attr_list_ref           (PangoAttrList  *list);
+void               pango_attr_list_unref         (PangoAttrList  *list);
+PangoAttrList *    pango_attr_list_copy          (PangoAttrList  *list);
+void               pango_attr_list_insert        (PangoAttrList  *list,
 						  PangoAttribute *attr);
-void                pango_attr_list_change       (PangoAttrList  *list,
+void               pango_attr_list_insert_before (PangoAttrList  *list,
 						  PangoAttribute *attr);
-PangoAttrIterator * pango_attr_list_get_iterator (PangoAttrList  *list);
+void               pango_attr_list_change        (PangoAttrList  *list,
+						  PangoAttribute *attr);
+PangoAttrIterator *pango_attr_list_get_iterator  (PangoAttrList  *list);
 
 void               pango_attr_iterator_range    (PangoAttrIterator     *iterator,
                                                  gint                  *start,
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index abcc7f5b..f8afe07a 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -39,6 +39,8 @@ struct _PangoLayout
 
   PangoContext *context;
   PangoAttrList *attrs;
+  PangoFontDescription *font_desc;
+  
   gchar *text;
   int length;			/* length of text in bytes */
   int width;			/* wrap width, in device units */
@@ -115,6 +117,7 @@ static void
 pango_layout_init (PangoLayout *layout)
 {
   layout->attrs = NULL;
+  layout->font_desc = NULL;
   layout->text = NULL;
   layout->length = 0;
   layout->width = -1;
@@ -335,6 +338,34 @@ pango_layout_set_attributes (PangoLayout   *layout,
 }
 
 /**
+ * pango_layout_set_font_description:
+ * @layout: a #PangoLayout
+ * @desc: the new pango font description, or %NULL to unset the
+ *        current font description.
+ * 
+ * Set the default font description for the layout. If no font 
+ * description is set on the layout, the font description from
+ * the layout's context is used.
+ **/
+void
+pango_layout_set_font_description (PangoLayout                 *layout,
+				    const PangoFontDescription *desc)
+{
+  g_return_if_fail (layout != NULL);
+  g_return_if_fail (desc != NULL);
+
+  if (layout->font_desc)
+    pango_font_description_free (layout->font_desc);
+  
+  if (desc)
+    layout->font_desc = pango_font_description_copy (desc);
+  else
+    layout->font_desc = NULL;
+
+  pango_layout_clear_lines (layout);
+}
+
+/**
  * pango_layout_set_justify:
  * @layout: a #PangoLayout
  * @justify: whether the lines in the layout should be justified.
@@ -1758,6 +1789,8 @@ pango_layout_check_lines (PangoLayout *layout)
   do
     {
       PangoLayoutLine *line;
+      PangoAttrList *attrs;
+      
       GList *items, *tmp_list;
       gboolean last_cant_end = FALSE;
       gboolean current_cant_end = FALSE;
@@ -1776,16 +1809,34 @@ pango_layout_check_lines (PangoLayout *layout)
       if (end == layout->text + layout->length)
 	done = TRUE;
   
-      /* FIXME, should we force people to set the attrs? */
       if (layout->attrs)
-	items = pango_itemize (layout->context, start, end - start, layout->attrs);
+	{
+	  /* If we were being clever, we'd try to catch the case here
+	   * where the set font desc doesn't change the font for any
+	   * characters.
+	   */
+	  if (layout->font_desc)
+	    attrs = pango_attr_list_copy (layout->attrs);
+	  else
+	    attrs = layout->attrs;
+	}
       else
+	attrs = pango_attr_list_new ();
+
+      if (layout->font_desc)
 	{
-	  PangoAttrList *attrs = pango_attr_list_new ();
-	  items = pango_itemize (layout->context, start, end - start, attrs);
-	  pango_attr_list_unref (attrs);
+	  PangoAttribute *attr = pango_attr_font_desc_new (layout->font_desc);
+	  attr->start_index = 0;
+	  attr->end_index = layout->length;
+	  
+	  pango_attr_list_insert_before (attrs, attr);
 	}
 
+      items = pango_itemize (layout->context, start, end - start, attrs);
+
+      if (attrs != layout->attrs)
+	  pango_attr_list_unref (attrs);
+
       get_para_log_attrs (start, items, layout->log_attrs + start_offset);
 
       line = pango_layout_line_new (layout);
@@ -2260,8 +2311,15 @@ pango_layout_line_get_empty_extents (PangoLayoutLine *line,
 	      
 	      if (start <= index && index < end)
 		{
+		  PangoFontDescription *base_font_desc;
+
+		  if (layout->font_desc)
+		    base_font_desc = layout->font_desc;
+		  else
+		    base_font_desc = pango_context_get_font_description (layout->context);
+		    
 		  pango_attr_iterator_get_font (iter,
-						pango_context_get_font_description (layout->context),
+						base_font_desc,
 						&font_desc,
 						NULL);
 		  break;
@@ -2274,7 +2332,10 @@ pango_layout_line_get_empty_extents (PangoLayoutLine *line,
 	}
       else
 	{
-	  font_desc = *pango_context_get_font_description (layout->context);
+	  if (layout->font_desc)
+	    font_desc = *layout->font_desc;
+	  else
+	    font_desc = *pango_context_get_font_description (layout->context);
 	}
 
       font = pango_context_load_font (layout->context, &font_desc);
diff --git a/pango/pango-layout.h b/pango/pango-layout.h
index 516b867a..91e22605 100644
--- a/pango/pango-layout.h
+++ b/pango/pango-layout.h
@@ -77,21 +77,23 @@ void           pango_layout_set_text       (PangoLayout    *layout,
 					    const char     *text,
 					    int             length);
 
-void           pango_layout_set_width     (PangoLayout    *layout,
-					   int             width);
-int            pango_layout_get_width     (PangoLayout    *layout);
-void           pango_layout_set_indent    (PangoLayout    *layout,
-					   int             indent);
-int            pango_layout_get_indent    (PangoLayout    *layout);
-void           pango_layout_set_spacing   (PangoLayout    *layout,
-					   int             spacing);
-int            pango_layout_get_spacing   (PangoLayout    *layout);
-void           pango_layout_set_justify   (PangoLayout    *layout,
-					   gboolean        justify);
-gboolean       pango_layout_get_justify   (PangoLayout    *layout);
-void           pango_layout_set_alignment (PangoLayout    *layout,
-					   PangoAlignment  alignment);
-PangoAlignment pango_layout_get_alignment (PangoLayout    *layout);
+void           pango_layout_set_font_description (PangoLayout                *layout,
+						  const PangoFontDescription *desc);
+void           pango_layout_set_width            (PangoLayout                *layout,
+						  int                         width);
+int            pango_layout_get_width            (PangoLayout                *layout);
+void           pango_layout_set_indent           (PangoLayout                *layout,
+						  int                         indent);
+int            pango_layout_get_indent           (PangoLayout                *layout);
+void           pango_layout_set_spacing          (PangoLayout                *layout,
+						  int                         spacing);
+int            pango_layout_get_spacing          (PangoLayout                *layout);
+void           pango_layout_set_justify          (PangoLayout                *layout,
+						  gboolean                    justify);
+gboolean       pango_layout_get_justify          (PangoLayout                *layout);
+void           pango_layout_set_alignment        (PangoLayout                *layout,
+						  PangoAlignment              alignment);
+PangoAlignment pango_layout_get_alignment        (PangoLayout                *layout);
 
 void           pango_layout_context_changed (PangoLayout    *layout);