Add option to update window icon based on first page of a document (fixes pwmt/zathura#8)

doc/man/zathurarc.5.rst

@@ -1069,6 +1069,14 @@ Some features are disabled when using strict sandbox mode:
 
 No feature regressions are expected when using normal sandbox mode.
 
+window-icon-document
+^^^^^^^^^^^^^^^^^^^^
+Defines whether the window document should be updated based on the first page of
+a dcument.
+
+* Value type: Boolean
+* default value: false
+
 SEE ALSO
 ========
 

zathura/callbacks.c

@@ -758,3 +758,18 @@ cb_page_widget_scaled_button_release(ZathuraPage* page_widget, GdkEventButton* e
   synctex_edit(editor, page, event->x, event->y);
   g_free(editor);
 }
+
+void
+cb_window_update_icon(ZathuraRenderRequest* GIRARA_UNUSED(request), cairo_surface_t* surface, void* data)
+{
+  zathura_t* zathura = data;
+
+  girara_debug("updating window icon");
+  GdkPixbuf* pixbuf = gdk_pixbuf_get_from_surface(surface, 0, 0, cairo_image_surface_get_width(surface), cairo_image_surface_get_height(surface));
+  if (pixbuf == NULL) {
+    girara_error("Unable to convert cairo surface to Gdk Pixbuf.");
+  }
+
+  gtk_window_set_icon(GTK_WINDOW(zathura->ui.session->gtk.window), pixbuf);
+  g_object_unref(pixbuf);
+}

zathura/config.c

@@ -273,6 +273,8 @@ config_load_default(zathura_t* zathura)
   bool_value = false;
   girara_setting_add(gsession, "window-title-page",      &bool_value,  BOOLEAN, false, _("Display the page number in the window title"), cb_window_statbusbar_changed, NULL);
   bool_value = false;
+  girara_setting_add(gsession, "window-icon-document",   &bool_value,  BOOLEAN, false, _("Use first page of a document as window icon"), NULL, NULL);
+  bool_value = false;
   girara_setting_add(gsession, "statusbar-basename",     &bool_value,  BOOLEAN, false, _("Use basename of the file in the statusbar"), cb_window_statbusbar_changed, NULL);
   bool_value = false;
   girara_setting_add(gsession, "statusbar-home-tilde",  &bool_value,  BOOLEAN, false, _("Use ~ instead of $HOME in the filename in the statusbar"), cb_window_statbusbar_changed, NULL);

zathura/zathura.c

@@ -650,7 +650,8 @@ zathura_set_argv(zathura_t* zathura, char** argv)
 }
 
 static bool
-setup_renderer(zathura_t* zathura, zathura_document_t* document) {
+setup_renderer(zathura_t* zathura, zathura_document_t* document)
+{
  /* page cache size */
   int cache_size = 0;
   girara_setting_get(zathura->ui.session, "page-cache-size", &cache_size);
@@ -660,6 +661,7 @@ setup_renderer(zathura_t* zathura, zathura_document_t* document) {
     cache_size = ZATHURA_PAGE_CACHE_DEFAULT_SIZE;
   }
 
+  girara_debug("starting renderer with cache size %d", cache_size);
   ZathuraRenderer* renderer = zathura_renderer_new(cache_size);
   if (renderer == NULL) {
     return false;
@@ -684,6 +686,18 @@ setup_renderer(zathura_t* zathura, zathura_document_t* document) {
 
   zathura->sync.render_thread = renderer;
 
+  /* create render request to render window icon */
+  bool window_icon = false;
+  girara_setting_get(zathura->ui.session, "window-icon-document", &window_icon);
+  if (window_icon == true) {
+    girara_debug("starting render request for window icon");
+    ZathuraRenderRequest* request = zathura_render_request_new(renderer, zathura_document_get_page(document, 0));
+    g_signal_connect(request, "completed", G_CALLBACK(cb_window_update_icon), zathura);
+    zathura_render_request_set_render_plain(request, true);
+    zathura_render_request(request, 0);
+    zathura->window_icon_render_request = request;
+  }
+
   return true;
 }
 
@@ -1351,8 +1365,17 @@ document_close(zathura_t* zathura, bool keep_monitor)
     return false;
   }
 
+  /* reset window icon */
+  if (zathura->ui.session != NULL && zathura->window_icon_render_request != NULL) {
+    char* window_icon = NULL;
+    girara_setting_get(zathura->ui.session, "window-icon", &window_icon);
+    girara_setting_set(zathura->ui.session, "window-icon", window_icon);
+    g_free(window_icon);
+  }
+
   /* stop rendering */
   zathura_renderer_stop(zathura->sync.render_thread);
+  g_clear_object(&zathura->window_icon_render_request);
 
   /* remove monitor */
   if (keep_monitor == false) {
@@ -1375,6 +1398,7 @@ document_close(zathura_t* zathura, bool keep_monitor)
     save_fileinfo_to_db(zathura);
   }
 
+  /* remove jump list */
   girara_list_iterator_free(zathura->jumplist.cur);
   zathura->jumplist.cur = NULL;
   girara_list_free(zathura->jumplist.list);

zathura/zathura.h

@@ -183,6 +183,7 @@ struct zathura_s
   GtkWidget** pages; /**< The page widgets */
   zathura_database_t* database; /**< The database */
   ZathuraDbus* dbus; /**< D-Bus service */
+  ZathuraRenderRequest* window_icon_render_request; /**< Render request for window icon */
 
   /**
    * File monitor