[presentation] Fix vertical white line in documents with black background

We never show the last vertical line since it's usually wrong due to
rounding errors. Fixes bug #438760.

diff --git a/libview/ev-view-presentation.c b/libview/ev-view-presentation.c
index c5166023fdbbadf0653b4b4f71d5d023508c80bc..24a8801242869f398cb16eeef5cc9c54658d0a76 100644 (file)
--- a/libview/ev-view-presentation.c
+++ b/libview/ev-view-presentation.c
@@ -1039,6 +1039,9 @@ ev_view_presentation_expose_event (GtkWidget      *widget,
                        cairo_translate (cr, page_area.x, page_area.y);
                        page_area.x = page_area.y = 0;
 
+                       /* Try to fix rounding errors */
+                       page_area.width--;
+
                        ev_transition_animation_paint (pview->animation, cr, page_area);
                        cairo_destroy (cr);
                }
@@ -1059,12 +1062,13 @@ ev_view_presentation_expose_event (GtkWidget      *widget,
        if (gdk_rectangle_intersect (&page_area, &(event->area), &overlap)) {
                cr = gdk_cairo_create (widget->window);
 
-               cairo_translate (cr, overlap.x, overlap.y);
-               cairo_surface_set_device_offset (surface,
-                                                overlap.x - page_area.x,
-                                                overlap.y - page_area.y);
-               cairo_set_source_surface (cr, surface, 0, 0);
-               cairo_paint (cr);
+               /* Try to fix rounding errors. See bug #438760 */
+               if (overlap.width == page_area.width)
+                       overlap.width--;
+
+               cairo_rectangle (cr, overlap.x, overlap.y, overlap.width, overlap.height);
+               cairo_set_source_surface (cr, surface, page_area.x, page_area.y);
+               cairo_fill (cr);
                cairo_destroy (cr);
        }