[evince] Check for failed rendering jobs

[Felipe Borges <felipeborges src gnome org>]

commit f93a84c015a53f6fa89f2af04ad004631d8b7442
Author: Marek Kasik <mkasik redhat com>
Date:   Wed Feb 11 12:13:40 2015 +0100

    Check for failed rendering jobs
    
    Check whether creating of thumbnails for sidebar, thumbnails for recent view
    or rendering of document itself failed to avoid crashes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744049
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744586

 libdocument/ev-document.c     |    8 +++++---
 libview/ev-jobs.c             |   26 +++++++++++++++++++++++++-
 libview/ev-pixbuf-cache.c     |    6 ++++++
 shell/ev-recent-view.c        |    3 ++-
 shell/ev-sidebar-thumbnails.c |    5 +++++
 5 files changed, 43 insertions(+), 5 deletions(-)
---
diff --git a/libdocument/ev-document.c b/libdocument/ev-document.c
index 6c2f1b9..6af0ad7 100644
--- a/libdocument/ev-document.c
+++ b/libdocument/ev-document.c
@@ -724,11 +724,13 @@ _ev_document_get_thumbnail (EvDocument      *document,
                            EvRenderContext *rc)
 {
        cairo_surface_t *surface;
-       GdkPixbuf       *pixbuf;
+       GdkPixbuf       *pixbuf = NULL;
 
        surface = ev_document_render (document, rc);
-       pixbuf = ev_document_misc_pixbuf_from_surface (surface);
-       cairo_surface_destroy (surface);
+       if (surface != NULL) {
+               pixbuf = ev_document_misc_pixbuf_from_surface (surface);
+               cairo_surface_destroy (surface);
+       }
 
        return pixbuf;
 }
diff --git a/libview/ev-jobs.c b/libview/ev-jobs.c
index 3337276..d338666 100644
--- a/libview/ev-jobs.c
+++ b/libview/ev-jobs.c
@@ -637,6 +637,21 @@ ev_job_render_run (EvJob *job)
        g_object_unref (ev_page);
 
        job_render->surface = ev_document_render (job->document, rc);
+
+       if (job_render->surface == NULL) {
+               ev_document_fc_mutex_unlock ();
+               ev_document_doc_mutex_unlock ();
+               g_object_unref (rc);
+
+               ev_job_failed (job,
+                              EV_DOCUMENT_ERROR,
+                              EV_DOCUMENT_ERROR_INVALID,
+                              _("Failed to render page %d"),
+                              job_render->page);
+
+               return FALSE;
+       }
+
        /* If job was cancelled during the page rendering,
         * we return now, so that the thread is finished ASAP
         */
@@ -873,7 +888,16 @@ ev_job_thumbnail_run (EvJob *job)
                 g_object_unref (pixbuf);
         }
 
-       ev_job_succeeded (job);
+       if ((job_thumb->format == EV_JOB_THUMBNAIL_PIXBUF && pixbuf == NULL) ||
+            job_thumb->thumbnail_surface == NULL) {
+               ev_job_failed (job,
+                              EV_DOCUMENT_ERROR,
+                              EV_DOCUMENT_ERROR_INVALID,
+                              _("Failed to create thumbnail for page %d"),
+                              job_thumb->page);
+       } else {
+               ev_job_succeeded (job);
+       }
        
        return FALSE;
 }
diff --git a/libview/ev-pixbuf-cache.c b/libview/ev-pixbuf-cache.c
index f308c9c..c7ae47a 100644
--- a/libview/ev-pixbuf-cache.c
+++ b/libview/ev-pixbuf-cache.c
@@ -337,6 +337,12 @@ job_finished_cb (EvJob         *job,
 
        job_info = find_job_cache (pixbuf_cache, job_render->page);
 
+       if (ev_job_is_failed (job)) {
+               job_info->job = NULL;
+               g_object_unref (job);
+               return;
+       }
+
        copy_job_to_job_info (job_render, job_info, pixbuf_cache);
        g_signal_emit (pixbuf_cache, signals[JOB_FINISHED], 0, job_info->region);
 }
diff --git a/shell/ev-recent-view.c b/shell/ev-recent-view.c
index facea47..2dabf86 100644
--- a/shell/ev-recent-view.c
+++ b/shell/ev-recent-view.c
@@ -350,7 +350,8 @@ static void
 thumbnail_job_completed_callback (EvJobThumbnail           *job,
                                   GetDocumentInfoAsyncData *data)
 {
-        if (g_cancellable_is_cancelled (data->cancellable)) {
+        if (g_cancellable_is_cancelled (data->cancellable) ||
+            ev_job_is_failed (EV_JOB (job))) {
                 get_document_info_async_data_free (data);
                 return;
         }
diff --git a/shell/ev-sidebar-thumbnails.c b/shell/ev-sidebar-thumbnails.c
index 78b4b31..9374034 100644
--- a/shell/ev-sidebar-thumbnails.c
+++ b/shell/ev-sidebar-thumbnails.c
@@ -934,7 +934,12 @@ thumbnail_job_completed_callback (EvJobThumbnail      *job,
         cairo_surface_t            *surface;
 #ifdef HAVE_HIDPI_SUPPORT
         gint                        device_scale;
+#endif
+
+        if (ev_job_is_failed (EV_JOB (job)))
+          return;
 
+#ifdef HAVE_HIDPI_SUPPORT
         device_scale = gtk_widget_get_scale_factor (widget);
         cairo_surface_set_device_scale (job->thumbnail_surface, device_scale, device_scale);
 #endif