Add assertions for a couple programmer errors
diff --git a/src/hb-shape-plan.cc b/src/hb-shape-plan.cc
index 22a226f..a6d2d26 100644
--- a/src/hb-shape-plan.cc
+++ b/src/hb-shape-plan.cc
@@ -27,6 +27,7 @@
#include "hb-shape-plan-private.hh"
#include "hb-shaper-private.hh"
#include "hb-font-private.hh"
+#include "hb-buffer-private.hh"
#define HB_SHAPER_IMPLEMENT(shaper) \
HB_SHAPER_DATA_ENSURE_DECLARE(shaper, face) \
@@ -178,9 +179,14 @@
const hb_feature_t *features,
unsigned int num_features)
{
- if (unlikely (shape_plan->face != font->face))
+ if (unlikely (hb_object_is_inert (shape_plan) ||
+ hb_object_is_inert (font) ||
+ hb_object_is_inert (buffer)))
return false;
+ assert (shape_plan->face == font->face);
+ assert (hb_segment_properties_equal (&shape_plan->props, &buffer->props));
+
#define HB_SHAPER_EXECUTE(shaper) \
HB_STMT_START { \
return HB_SHAPER_DATA (shaper, shape_plan) && \
