More contour point use

src/hb-font.cc

@@ -196,6 +196,7 @@ hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
 			   unsigned int point_index,
 			   hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
 {
+  *x = 0; *y = 0;
   return font->klass->get_contour_point (font, face, font->user_data,
 					 point_index,
 					 glyph, x, y);

src/hb-ot-layout-gdef-private.hh

@@ -116,9 +116,11 @@ struct CaretValueFormat2
   inline int get_caret_value (hb_ot_layout_context_t *context, hb_codepoint_t glyph_id) const
   {
     /* TODO vertical */
-    hb_position_t x = 0, y = 0;
-    hb_font_get_contour_point (context->font, context->face, caretValuePoint, glyph_id, &x, &y);
-    return x;
+    hb_position_t x, y;
+    if (hb_font_get_contour_point (context->font, context->face, caretValuePoint, glyph_id, &x, &y))
+      return x;
+    else
+      return 0;
   }
 
   inline bool sanitize (SANITIZE_ARG_DEF) {

src/hb-ot-layout-gpos-private.hh

@@ -221,10 +221,15 @@ struct AnchorFormat2
   inline void get_anchor (hb_ot_layout_context_t *layout_context, hb_codepoint_t glyph_id,
 			  hb_position_t *x, hb_position_t *y) const
   {
-      /* TODO Contour
-       * NOTE only adjust directions with nonzero ppem */
-      *x = _hb_16dot16_mul_round (layout_context->font->x_scale, xCoordinate);
-      *y = _hb_16dot16_mul_round (layout_context->font->y_scale, yCoordinate);
+      unsigned int x_ppem = layout_context->font->x_ppem;
+      unsigned int y_ppem = layout_context->font->y_ppem;
+      hb_position_t cx, cy;
+      hb_bool_t ret;
+
+      if (x_ppem || y_ppem)
+	ret = hb_font_get_contour_point (layout_context->font, layout_context->face, anchorPoint, glyph_id, &cx, &cy);
+      *x = x_ppem && ret ? cx : _hb_16dot16_mul_round (layout_context->font->x_scale, xCoordinate);
+      *y = y_ppem && ret ? cy : _hb_16dot16_mul_round (layout_context->font->y_scale, yCoordinate);
   }
 
   inline bool sanitize (SANITIZE_ARG_DEF) {