[evince] ev-view-accessible: Rewrite get_run_attributes to return the text attributes from the document

[Carlos Garcia Campos <carlosgc src gnome org>]

commit f8a0ce334609db99274aee28354ddc113c2ab477
Author: Antia Puentes <apuentes igalia com>
Date:   Wed Jul 10 19:18:14 2013 +0200

    ev-view-accessible: Rewrite get_run_attributes to return the text attributes from the document
    
    https://bugzilla.gnome.org/show_bug.cgi?id=639932

 libview/ev-view-accessible.c |  120 ++++++++++++++++++++++++++++++++++++++----
 1 files changed, 109 insertions(+), 11 deletions(-)
---
diff --git a/libview/ev-view-accessible.c b/libview/ev-view-accessible.c
index 6e60dcb..4c3af0b 100644
--- a/libview/ev-view-accessible.c
+++ b/libview/ev-view-accessible.c
@@ -349,29 +349,127 @@ ev_view_accessible_set_caret_offset (AtkText *text, gint offset)
        return TRUE;
 }
 
+static AtkAttributeSet *
+add_attribute (AtkAttributeSet  *attr_set,
+               AtkTextAttribute  attr_type,
+               gchar            *attr_value)
+{
+  AtkAttribute *attr = g_new (AtkAttribute, 1);
+
+  attr->name = g_strdup (atk_text_attribute_get_name (attr_type));
+  attr->value = attr_value;
+
+  return g_slist_prepend (attr_set, attr);
+}
+
+static AtkAttributeSet *
+get_run_attributes (PangoAttrList   *attrs,
+                   const gchar     *text,
+                   gint             offset,
+                   gint            *start_offset,
+                   gint            *end_offset)
+{
+       AtkAttributeSet   *atk_attr_set = NULL;
+       PangoAttrString   *pango_string;
+       PangoAttrInt      *pango_int;
+       PangoAttrColor    *pango_color;
+       PangoAttrIterator *iter;
+       gint               i, start, end;
+       gboolean           has_attrs = FALSE;
+       glong              text_length;
+       gchar             *attr_value;
+
+       text_length = g_utf8_strlen (text, -1);
+       if (offset < 0 || offset >= text_length)
+               return NULL;
+
+       /* Check if there are attributes for the offset,
+        * and set the attributes range if positive */
+       iter = pango_attr_list_get_iterator (attrs);
+       i = g_utf8_offset_to_pointer (text, offset) - text;
+
+       do {
+               pango_attr_iterator_range (iter, &start, &end);
+               if (i >= start && i < end) {
+                       *start_offset = g_utf8_pointer_to_offset (text, text + start);
+                       if (end == G_MAXINT) /* Last iterator */
+                               end = text_length;
+                       *end_offset = g_utf8_pointer_to_offset (text, text + end);
+                        has_attrs = TRUE;
+               }
+       } while (!has_attrs && pango_attr_iterator_next (iter));
+
+       if (!has_attrs) {
+               pango_attr_iterator_destroy (iter);
+               return NULL;
+       }
+
+       /* Create the AtkAttributeSet from the Pango attributes */
+       pango_string = (PangoAttrString *) pango_attr_iterator_get (iter, PANGO_ATTR_FAMILY);
+       if (pango_string) {
+               attr_value = g_strdup (pango_string->value);
+               atk_attr_set = add_attribute (atk_attr_set, ATK_TEXT_ATTR_FAMILY_NAME, attr_value);
+       }
+
+       pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_SIZE);
+       if (pango_int) {
+               attr_value = g_strdup_printf ("%i", pango_int->value / PANGO_SCALE);
+               atk_attr_set = add_attribute (atk_attr_set, ATK_TEXT_ATTR_SIZE, attr_value);
+       }
+
+       pango_int = (PangoAttrInt *) pango_attr_iterator_get (iter, PANGO_ATTR_UNDERLINE);
+       if (pango_int) {
+               atk_attr_set = add_attribute (atk_attr_set,
+                                             ATK_TEXT_ATTR_UNDERLINE,
+                                             g_strdup (atk_text_attribute_get_value (ATK_TEXT_ATTR_UNDERLINE,
+                                                                                     pango_int->value)));
+       }
+
+       pango_color = (PangoAttrColor *) pango_attr_iterator_get (iter, PANGO_ATTR_FOREGROUND);
+       if (pango_color) {
+               attr_value = g_strdup_printf ("%u,%u,%u",
+                                             pango_color->color.red,
+                                             pango_color->color.green,
+                                             pango_color->color.blue);
+               atk_attr_set = add_attribute (atk_attr_set, ATK_TEXT_ATTR_FG_COLOR, attr_value);
+       }
+
+       pango_attr_iterator_destroy (iter);
+
+       return atk_attr_set;
+}
+
 static AtkAttributeSet*
 ev_view_accessible_get_run_attributes (AtkText *text,
-                                      gint    offset,
+                                      gint     offset,
                                       gint    *start_offset,
                                       gint    *end_offset)
 {
-       GtkWidget *widget;
-       GtkTextBuffer *buffer;
-       AtkAttributeSet *retval;
+       EvView        *view;
+       GtkWidget     *widget;
+       PangoAttrList *attrs;
+       const gchar   *page_text;
+
+       if (offset < 0)
+               return NULL;
 
        widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (text));
-       if (widget == NULL)
-               /* State is defunct */
+       if (!widget)
                return NULL;
 
-       buffer = ev_view_accessible_get_text_buffer (EV_VIEW_ACCESSIBLE (text), EV_VIEW (widget));
-       if (!buffer)
+       view = EV_VIEW (widget);
+       if (!view->page_cache)
                return NULL;
 
-       retval = gail_misc_buffer_get_run_attributes (buffer, offset,
-                                                     start_offset, end_offset);
+       page_text = ev_page_cache_get_text (view->page_cache, view->current_page);
+       if (!page_text)
+               return NULL;
 
-       return retval;
+       attrs = ev_page_cache_get_text_attrs (view->page_cache, view->current_page);
+       if (!attrs)
+               return NULL;
+
+       return get_run_attributes (attrs, page_text, offset, start_offset, end_offset);
 }
 
 static AtkAttributeSet*