Tweak pdf_graft_map API.

Passing a pdf_document to pdf_graft_object to specify the source
document is redundant, as if we need to know the document, it will
be pickled into the object we are copying.

Similarly, repeatedly having to pass the destination document
seems silly when we can just pickle it into the map too (and this
removes the possibility of people using a different destination
document part way through).

This leaves to simplifying the pdf_graft_object call, at the expense
of splitting it into 2 calls - one with a map, and one without.

Also, we can delay the creation of the mapping table until we are
first asked to copy an object that requires deep copying. This
avoids us ever having to manually pass in the source document.

This has knock-on effects in the java and javascript classes, but
with the advantage of being clearer in the end (IMHO).

Conflicts:
	include/mupdf/pdf/document.h

1 files changed, 2 insertions, 2 deletions

diff --git a/source/tools/pdfmerge.c b/source/tools/pdfmerge.c
index 7e38f0e1..14551ecf 100644
--- a/source/tools/pdfmerge.c
+++ b/source/tools/pdfmerge.c
@@ -56,7 +56,7 @@ static void page_merge(int page_from, int page_to, pdf_graft_map *graft_map)
 		{
 			obj = pdf_dict_get(ctx, page_ref, copy_list[i]);
 			if (obj != NULL)
-				pdf_dict_put_drop(ctx, page_dict, copy_list[i], pdf_graft_object(ctx, doc_des, doc_src, obj, graft_map));
+				pdf_dict_put_drop(ctx, page_dict, copy_list[i], pdf_graft_mapped_object(ctx, graft_map, obj));
 		}
 
 		/* Add the page object to the destination document. */
@@ -81,7 +81,7 @@ static void merge_range(const char *range)
 	pdf_graft_map *graft_map;
 
 	count = pdf_count_pages(ctx, doc_src);
-	graft_map = pdf_new_graft_map(ctx, doc_src);
+	graft_map = pdf_new_graft_map(ctx, doc_des);
 
 	fz_try(ctx)
 	{