[instancer] add a warning for CFF partial instancing

It's not supported yet
harfbuzz · May 7, 2024 · d58cb7f · d58cb7f
1 parent 847ead3
commit d58cb7f
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diff --git a/src/hb-subset-cff1.cc b/src/hb-subset-cff1.cc
@@ -986,6 +986,9 @@ OT::cff1::accelerator_subset_t::serialize (hb_serialize_context_t *c,
 bool
 OT::cff1::accelerator_subset_t::subset (hb_subset_context_t *c) const
 {
+  if (c->plan->normalized_coords && !c->plan->all_axes_pinned)
+    fprintf (stdout, "warning: CFF partial instancing is not supported.\n");
+
   cff1_subset_plan cff_plan;
 
   if (unlikely (!cff_plan.create (*this, c->plan)))

diff --git a/src/hb-subset-cff2.cc b/src/hb-subset-cff2.cc
@@ -666,6 +666,9 @@ OT::cff2::accelerator_subset_t::serialize (hb_serialize_context_t *c,
 bool
 OT::cff2::accelerator_subset_t::subset (hb_subset_context_t *c) const
 {
+  if (c->plan->normalized_coords && !c->plan->all_axes_pinned)
+    fprintf (stdout, "warning: CFF partial instancing is not supported.\n");
+
   cff2_subset_plan cff2_plan;
 
   if (unlikely (!cff2_plan.create (*this, c->plan))) return false;