[poppler] PopplerPage should not cache image_dev

[Kouhei Sutou]

Hi,

I find a problem of the GLib bindings.

poppler_page_get_image() always returns NULL after
poppler_page_get_image_mapping() is called. Because
PopplerPage.image_dev is cached when
poppler_page_get_image_mapping() is called. The cached
image_dev doesn't have CairoImageOutputDev.imgDrawCbk but
poppler_page_get_image() needs image_dev that has
image_draw_decide_cb() as CairoImageOutputDev.imgDrawCbk.


The following example shows poppler_page_get_image() always
returns NULL.

  PopplerPage *first_page;
  GList *image_mapping, *node;

  first_page = poppler_document_get_page(document, 0);
  image_mapping = poppler_page_get_image_mapping(page);
  for (node = image_mapping; node; node = g_list_next(node)) {
    PopplerImageMapping *mapping = node->data;
    g_print("%d:%p\n",
            mapping->image_id,
            poppler_page_get_image(first_page, mapping->image_id));
  }
  poppler_page_free_image_Mapping(image_mapping);
  g_object_unref(first_page);


Thanks,
--
kou