[latex3-commits] [git/LaTeX3-latex3-latex3] master: Add scope surrounding PDF graphics (4860a074f)

[Joseph Wright]

Repository : https://github.com/latex3/latex3
On branch  : master
Link       : https://github.com/latex3/latex3/commit/4860a074f9521b24c5f39a39f7de9196cfc0b7f5

>---------------------------------------------------------------

commit 4860a074f9521b24c5f39a39f7de9196cfc0b7f5
Author: Joseph Wright <joseph.wright at morningstar2.co.uk>
Date:   Tue Feb 23 16:48:45 2021 +0000

    Add scope surrounding PDF graphics


>---------------------------------------------------------------

4860a074f9521b24c5f39a39f7de9196cfc0b7f5
 l3backend/CHANGELOG.md           |  3 +++
 l3backend/l3backend-graphics.dtx | 10 ++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/l3backend/CHANGELOG.md b/l3backend/CHANGELOG.md
index f787acd70..d7395455c 100644
--- a/l3backend/CHANGELOG.md
+++ b/l3backend/CHANGELOG.md
@@ -6,6 +6,9 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+### Changed
+- Add scope surrounding PDF graphics
+
 ## [2021-02-18]
 
 ### Changed
diff --git a/l3backend/l3backend-graphics.dtx b/l3backend/l3backend-graphics.dtx
index c3ec121c0..fb957eef5 100644
--- a/l3backend/l3backend-graphics.dtx
+++ b/l3backend/l3backend-graphics.dtx
@@ -164,7 +164,9 @@
 %   Measuring the graphic is done by boxing up: for PDF graphics we could
 %   use |\tex_pdfximagebbox:D|, but if doesn't work for other types.
 %   As the box always starts at $(0,0)$ there is no need to worry about
-%   the lower-left position.
+%   the lower-left position. The scope in the internal box here means that
+%   thre is no leakage of any graphics stage information at point-of-use from
+%   the image to the rest of the document.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_backend_getbb_auxii:n #1
   {
@@ -187,7 +189,11 @@
         { \l_graphics_pagebox_tl }
       {#1}
     \hbox_set:Nn \l_@@_internal_box
-      { \tex_pdfrefximage:D \tex_pdflastximage:D }
+      {
+        \__kernel_backend_scope_begin:
+        \tex_pdfrefximage:D \tex_pdflastximage:D
+        \__kernel_backend_scope_end:
+      }
     \dim_set:Nn \l_graphics_urx_dim { \box_wd:N \l_@@_internal_box }
     \dim_set:Nn \l_graphics_ury_dim { \box_ht:N \l_@@_internal_box }
     \int_const:cn { c_@@_graphics_ #1 \l_@@_graphics_attr_tl _int }