[latex3-commits] [git/LaTeX3-latex3-latex3] master: Extend opacity to older (x)dvipdfmx (1238d6e0f)

[Joseph Wright]

Repository : https://github.com/latex3/latex3
On branch  : master
Link       : https://github.com/latex3/latex3/commit/1238d6e0fba1f3d5b553cbf30bc96c12d5d48292

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

commit 1238d6e0fba1f3d5b553cbf30bc96c12d5d48292
Author: Joseph Wright <joseph.wright at morningstar2.co.uk>
Date:   Sun Jan 24 17:37:41 2021 +0000

    Extend opacity to older (x)dvipdfmx
    
    At least, I hope so!


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

1238d6e0fba1f3d5b553cbf30bc96c12d5d48292
 l3backend/l3backend-opacity.dtx | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/l3backend/l3backend-opacity.dtx b/l3backend/l3backend-opacity.dtx
index 25999e291..c9f2a8cde 100644
--- a/l3backend/l3backend-opacity.dtx
+++ b/l3backend/l3backend-opacity.dtx
@@ -214,11 +214,36 @@
 %    \end{macrocode}
 %
 % \begin{macro}{\@@_backend_select:n}
-%   Older backends have no stack support.
+%   Older backends have no stack support, so everything is done directly.
 %    \begin{macrocode}
 \int_compare:nNnT \c__kernel_sys_dvipdfmx_version_int < { 20201111 }
   {
-    \cs_gset_protected:Npn \@@_backend_select:n #1 { }
+    \cs_gset_protected:Npn \@@_backend_select_aux:n #1
+      {
+        \tl_set:Nn \l_@@_backend_fill_tl {#1}
+        \tl_set:Nn \l_@@_backend_stroke_tl {#1}
+        \pdfmanagement_add:nnn { Page / Resources / ExtGState }
+          { opacity #1 }
+          { << /ca ~ #1 /CA ~ #1 >> }
+        \__kernel_backend_literal_pdf:n { /opacity #1 ~ gs }
+      }
+    \cs_gset_protected:Npn \@@_backend_fill_stroke:nn #1#2
+      {
+        \str_if_eq:nnTF {#1} {#2}
+          { \@@_backend_select_aux:n {#1} }
+          {
+            \tl_set:Nn \l_@@_backend_fill_tl {#1}
+            \tl_set:Nn \l_@@_backend_stroke_tl {#2}
+            \pdfmanagement_add:nnn { Page / Resources / ExtGState }
+              { opacity.fill #1 }
+              { << /ca ~ #1 >> }
+            \pdfmanagement_add:nnn { Page / Resources / ExtGState }
+              { opacity.stroke #1 }
+              { << /CA ~ #2 >> }
+            \__kernel_backend_literal_pdf:n
+             { /opacity.fill #1 ~ gs /opacity.stroke #2 ~ gs }
+          }
+      }
   }
 %    \end{macrocode}
 % \end{macro}