[evince] pdf: Implement ev_document_get_thumbnail_surface

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 29b85dc40f5bf8b68b5647e09997f8d17ee70c18
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sat Mar 22 12:46:09 2014 +0100

    pdf: Implement ev_document_get_thumbnail_surface

 backend/pdf/ev-poppler.cc |   53 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)
---
diff --git a/backend/pdf/ev-poppler.cc b/backend/pdf/ev-poppler.cc
index c751768..b6e34e7 100644
--- a/backend/pdf/ev-poppler.cc
+++ b/backend/pdf/ev-poppler.cc
@@ -517,6 +517,58 @@ pdf_document_get_thumbnail (EvDocument      *document,
        return pixbuf;
 }
 
+static cairo_surface_t *
+pdf_document_get_thumbnail_surface (EvDocument      *document,
+                                   EvRenderContext *rc)
+{
+
+       PopplerPage *poppler_page;
+       cairo_surface_t *surface;
+       GdkPixbuf *pixbuf = NULL;
+       double page_width, page_height;
+       gint width, height;
+
+       poppler_page = POPPLER_PAGE (rc->page->backend_page);
+
+       poppler_page_get_size (poppler_page,
+                              &page_width, &page_height);
+
+       width = MAX ((gint)(page_width * rc->scale + 0.5), 1);
+       height = MAX ((gint)(page_height * rc->scale + 0.5), 1);
+
+       if (rc->rotation == 90 || rc->rotation == 270) {
+               gint  temp;
+
+               temp = width;
+               width = height;
+               height = temp;
+       }
+
+       surface = poppler_page_get_thumbnail (poppler_page);
+       if (surface) {
+               int surface_width = (rc->rotation == 90 || rc->rotation == 270) ?
+                       cairo_image_surface_get_height (surface) :
+                       cairo_image_surface_get_width (surface);
+
+               if (surface_width == width) {
+                       cairo_surface_t *rotated_surface;
+
+                       rotated_surface = ev_document_misc_surface_rotate_and_scale (surface, width, height, 
rc->rotation);
+                       cairo_surface_destroy (surface);
+                       return rotated_surface;
+               } else {
+                       /* The provided thumbnail has a different size */
+                       cairo_surface_destroy (surface);
+               }
+       }
+
+       ev_document_fc_mutex_lock ();
+       surface = pdf_page_render (poppler_page, width, height, rc);
+       ev_document_fc_mutex_unlock ();
+
+       return surface;
+}
+
 /* reference:
 
http://www.pdfa.org/lib/exe/fetch.php?id=pdfa%3Aen%3Atechdoc&cache=cache&media=pdfa:techdoc:tn0001_pdfa-1_and_namespaces_2008-03-18.pdf
 */
 static char *
@@ -947,6 +999,7 @@ pdf_document_class_init (PdfDocumentClass *klass)
        ev_document_class->get_page_label = pdf_document_get_page_label;
        ev_document_class->render = pdf_document_render;
        ev_document_class->get_thumbnail = pdf_document_get_thumbnail;
+       ev_document_class->get_thumbnail_surface = pdf_document_get_thumbnail_surface;
        ev_document_class->get_info = pdf_document_get_info;
        ev_document_class->get_backend_info = pdf_document_get_backend_info;
        ev_document_class->support_synctex = pdf_document_support_synctex;