libview: Add a way to get the text logical attributes from the page cache

It returns an array of PangoLogAttr with the logical attributes of the
text for the given page.

taken from:
https://git.gnome.org/browse/evince/commit/?h=gnome-3-10&id=6870279

4 files changed, 73 insertions, 10 deletions

diff --git a/libview/ev-jobs.c b/libview/ev-jobs.c
index a2ba309a..c82ac6b5 100644
--- a/libview/ev-jobs.c
+++ b/libview/ev-jobs.c
@@ -760,6 +760,13 @@ ev_job_page_data_run (EvJob *job)
 						  ev_page,
 						  &(job_pd->text_layout),
 						  &(job_pd->text_layout_length));
+        if ((job_pd->flags & EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS) && job_pd->text) {
+                job_pd->text_log_attrs_length = g_utf8_strlen (job_pd->text, -1);
+                job_pd->text_log_attrs = g_new0 (PangoLogAttr, job_pd->text_log_attrs_length + 1);
+
+                /* FIXME: We need API to get the language of the document */
+                pango_get_log_attrs (job_pd->text, -1, -1, NULL, job_pd->text_log_attrs, job_pd->text_log_attrs_length + 1);
+        }
 	if ((job_pd->flags & EV_PAGE_DATA_INCLUDE_LINKS) && EV_IS_DOCUMENT_LINKS (job->document))
 		job_pd->link_mapping =
 			ev_document_links_get_links (EV_DOCUMENT_LINKS (job->document), ev_page);
diff --git a/libview/ev-jobs.h b/libview/ev-jobs.h
index fdc23bae..ddcbd486 100644
--- a/libview/ev-jobs.h
+++ b/libview/ev-jobs.h
@@ -253,15 +253,16 @@ struct _EvJobRenderClass
 };
 
 typedef enum {
-	EV_PAGE_DATA_INCLUDE_NONE         = 0,
-	EV_PAGE_DATA_INCLUDE_LINKS        = 1 << 0,
-	EV_PAGE_DATA_INCLUDE_TEXT         = 1 << 1,
-	EV_PAGE_DATA_INCLUDE_TEXT_MAPPING = 1 << 2,
-	EV_PAGE_DATA_INCLUDE_TEXT_LAYOUT  = 1 << 3,
-	EV_PAGE_DATA_INCLUDE_IMAGES       = 1 << 4,
-	EV_PAGE_DATA_INCLUDE_FORMS        = 1 << 5,
-	EV_PAGE_DATA_INCLUDE_ANNOTS       = 1 << 6,
-	EV_PAGE_DATA_INCLUDE_ALL          = (1 << 7) - 1
+        EV_PAGE_DATA_INCLUDE_NONE           = 0,
+        EV_PAGE_DATA_INCLUDE_LINKS          = 1 << 0,
+        EV_PAGE_DATA_INCLUDE_TEXT           = 1 << 1,
+        EV_PAGE_DATA_INCLUDE_TEXT_MAPPING   = 1 << 2,
+        EV_PAGE_DATA_INCLUDE_TEXT_LAYOUT    = 1 << 3,
+        EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS = 1 << 4,
+        EV_PAGE_DATA_INCLUDE_IMAGES         = 1 << 5,
+        EV_PAGE_DATA_INCLUDE_FORMS          = 1 << 6,
+        EV_PAGE_DATA_INCLUDE_ANNOTS         = 1 << 7,
+        EV_PAGE_DATA_INCLUDE_ALL            = (1 << 8) - 1
 } EvJobPageDataFlags;
 
 struct _EvJobPageData
@@ -279,6 +280,8 @@ struct _EvJobPageData
 	gchar *text;
 	EvRectangle *text_layout;
 	guint text_layout_length;
+        PangoLogAttr *text_log_attrs;
+        gulong text_log_attrs_length;
 };
 
 struct _EvJobPageDataClass
diff --git a/libview/ev-page-cache.c b/libview/ev-page-cache.c
index b7c5e8aa..4deef21f 100644
--- a/libview/ev-page-cache.c
+++ b/libview/ev-page-cache.c
@@ -45,6 +45,8 @@ typedef struct _EvPageCacheData {
 	EvRectangle       *text_layout;
 	guint              text_layout_length;
 	gchar             *text;
+        PangoLogAttr      *text_log_attrs;
+        gulong             text_log_attrs_length;
 } EvPageCacheData;
 
 struct _EvPageCache {
@@ -123,6 +125,12 @@ ev_page_cache_data_free (EvPageCacheData *data)
 		g_free (data->text);
 		data->text = NULL;
 	}
+
+        if (data->text_log_attrs) {
+                g_free (data->text_log_attrs);
+                data->text_log_attrs = NULL;
+                data->text_log_attrs_length = 0;
+        }
 }
 
 static void
@@ -226,6 +234,12 @@ ev_page_cache_get_flags_for_data (EvPageCache     *cache,
 			flags | EV_PAGE_DATA_INCLUDE_TEXT_LAYOUT;
 	}
 
+        if (cache->flags & EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS) {
+                flags = (data->text_log_attrs) ?
+                        flags & ~EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS :
+                        flags | EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS;
+        }
+
 	return flags;
 }
 
@@ -270,6 +284,10 @@ job_page_data_finished_cb (EvJob       *job,
 	}
 	if (job_data->flags & EV_PAGE_DATA_INCLUDE_TEXT)
 		data->text = job_data->text;
+        if (job_data->flags & EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS) {
+                data->text_log_attrs = job_data->text_log_attrs;
+                data->text_log_attrs_length = job_data->text_log_attrs_length;
+        }
 	data->done = TRUE;
 	data->dirty = FALSE;
 
@@ -541,3 +559,35 @@ ev_page_cache_get_text_layout (EvPageCache  *cache,
 
 	return FALSE;
 }
+
+gboolean
+ev_page_cache_get_text_log_attrs (EvPageCache   *cache,
+                                  gint           page,
+                                  PangoLogAttr **log_attrs,
+                                  gulong        *n_attrs)
+{
+        EvPageCacheData *data;
+
+        g_return_val_if_fail (EV_IS_PAGE_CACHE (cache), FALSE);
+        g_return_val_if_fail (page >= 0 && page < cache->n_pages, FALSE);
+
+        if (!(cache->flags & EV_PAGE_DATA_INCLUDE_TEXT_LOG_ATTRS))
+                return FALSE;
+
+        data = &cache->page_list[page];
+        if (data->done) {
+                *log_attrs = data->text_log_attrs;
+                *n_attrs = data->text_log_attrs_length;
+
+                return TRUE;
+        }
+
+        if (data->job) {
+                *log_attrs = EV_JOB_PAGE_DATA (data->job)->text_log_attrs;
+                *n_attrs = EV_JOB_PAGE_DATA (data->job)->text_log_attrs_length;
+
+                return TRUE;
+        }
+
+        return FALSE;
+}
diff --git a/libview/ev-page-cache.h b/libview/ev-page-cache.h
index 1e6bf3f6..08d5ec7d 100644
--- a/libview/ev-page-cache.h
+++ b/libview/ev-page-cache.h
@@ -66,7 +66,10 @@ gboolean           ev_page_cache_get_text_layout        (EvPageCache       *cach
 							 gint               page,
 							 EvRectangle      **areas,
 							 guint             *n_areas);
-
+gboolean           ev_page_cache_get_text_log_attrs     (EvPageCache       *cache,
+                                                         gint               page,
+                                                         PangoLogAttr     **log_attrs,
+                                                         gulong            *n_attrs);
 G_END_DECLS
 
 #endif /* EV_PAGE_CACHE_H */