Curves: Use early out when apapting domain of single value

When adapting the domain of a single value virtual array, skip
allocating an array for the result and just return another single
value. Among other cases, this can help when everything is selected
in sculpt mode, moving domain interpolation from 5% of perf samples
to 0% when sculpting.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/curves_geometry.cc b/source/blender/blenkernel/intern/curves_geometry.cc
index 06789e34ad4..86bf3115c36 100644
--- a/source/blender/blenkernel/intern/curves_geometry.cc
+++ b/source/blender/blenkernel/intern/curves_geometry.cc
@@ -1558,6 +1558,11 @@ GVArray CurvesGeometry::adapt_domain(const GVArray &varray,
   if (from == to) {
     return varray;
   }
+  if (varray.is_single()) {
+    BUFFER_FOR_CPP_TYPE_VALUE(varray.type(), value);
+    varray.get_internal_single(value);
+    return GVArray::ForSingle(varray.type(), this->attributes().domain_size(to), value);
+  }
 
   if (from == ATTR_DOMAIN_POINT && to == ATTR_DOMAIN_CURVE) {
     return adapt_curve_domain_point_to_curve(*this, varray);