# HG changeset patch
# User Pantxo Diribarne <pantxo.diribarne@gmail.com>
# Date 1662064349 -7200
# Node ID 4c1be4d6d0d109c26ed3adc5d4741e55c1bffb59
# Parent  0dec459a40643742402518e089894ea099714b15
Hint SVG renderers to not interpolate images (bug #62998)

* octave-svgconvert.cc (add_custom_properites): New function that currently only
  sets the "image-rendering" attribute of image elements to "optimizeSpeed".

diff -r 0dec459a4064 -r 4c1be4d6d0d1 src/octave-svgconvert.cc
--- a/src/octave-svgconvert.cc	Wed Sep 14 09:59:31 2022 -0400
+++ b/src/octave-svgconvert.cc	Thu Sep 01 22:32:29 2022 +0200
@@ -827,6 +827,26 @@
     replace_polygons (parent_elt, collection[ii].first, collection[ii].second);
 }
 
+void add_custom_properties (QDomElement& parent_elt)
+{
+  QDomNodeList nodes = parent_elt.childNodes ();
+
+  for (int ii = 0; ii < nodes.count (); ii++)
+    {
+      QDomNode node = nodes.at (ii);
+      if (! node.isElement ())
+        continue;
+
+      QDomElement elt = node.toElement ();
+
+      if (elt.tagName () == "image")
+        elt.setAttribute ("image-rendering", "optimizeSpeed");
+      else
+        add_custom_properties (elt);
+    }
+
+}
+
 #if defined (OCTAVE_USE_WINDOWS_API) && defined (_UNICODE)
 extern "C"
 int
@@ -963,6 +983,9 @@
   if (QString (argv[5]).toInt ())
     reconstruct_polygons (root);
 
+  // Add custom properties to SVG
+  add_custom_properties (root);
+
   // Draw
   if (! strcmp (argv[2], "pdf"))
     {