[kerx] Implement Format0 apply()

Not hooked up to be called yet.

src/hb-aat-layout-common.hh

@@ -518,6 +518,7 @@ struct hb_aat_apply_context_t :
   static return_t default_return_value (void) { return false; }
   bool stop_sublookup_iteration (return_t r) const { return r; }
 
+  hb_ot_shape_plan_t *plan;
   hb_font_t *font;
   hb_face_t *face;
   hb_buffer_t *buffer;
@@ -527,10 +528,11 @@ struct hb_aat_apply_context_t :
   unsigned int lookup_index;
   unsigned int debug_depth;
 
-  inline hb_aat_apply_context_t (hb_font_t *font_,
+  inline hb_aat_apply_context_t (hb_ot_shape_plan_t *plan_,
+				 hb_font_t *font_,
 				 hb_buffer_t *buffer_,
 				 hb_blob_t *table) :
-		font (font_), face (font->face), buffer (buffer_),
+		plan (plan_), font (font_), face (font->face), buffer (buffer_),
 		sanitizer (), lookup_index (0), debug_depth (0)
   {
     sanitizer.init (table);

src/hb-aat-layout-kerx-table.hh

@@ -59,7 +59,9 @@ struct KerxSubTableFormat0
   {
     TRACE_APPLY (this);
 
-    /* TODO */
+    hb_kern_machine_t<KerxSubTableFormat0> machine (*this);
+
+    machine.kern (c->font, c->buffer, c->plan->kern_mask);
 
     return_trace (true);
   }
@@ -111,8 +113,6 @@ struct KerxSubTableFormat2
     unsigned int r = *(this+rightClassTable).get_value (right, num_glyphs);
     unsigned int offset = l + r;
     const FWORD *arr = &(this+array);
-    if (unlikely ((const void *) arr < (const void *) this || (const void *) arr >= (const void *) end))
-      return 0;
     const FWORD *v = &StructAtOffset<FWORD> (arr, offset);
     if (unlikely ((const void *) v < (const void *) arr || (const void *) (v + 1) > (const void *) end))
       return 0;
@@ -124,6 +124,13 @@ struct KerxSubTableFormat2
     TRACE_APPLY (this);
 
     /* TODO */
+#if 0
+    accelerator_t accel (*this,
+			 c->blob->data + c->blob->len,
+			 c->face->get_num_glyphs ());
+    hb_kern_machine_t<accelerator_t> machine (accel);
+    machine.kern (c->font, c->buffer, c->plan->kern_mask);
+#endif
 
     return_trace (true);
   }
@@ -138,6 +145,22 @@ struct KerxSubTableFormat2
 			  array.sanitize (c, this)));
   }
 
+  struct accelerator_t
+  {
+    const KerxSubTableFormat2 &table;
+    const char *end;
+    unsigned int num_glyphs;
+
+    inline accelerator_t (const KerxSubTableFormat2 &table_,
+			  const char *end_, unsigned int num_glyphs_)
+			  : table (table_), end (end_), num_glyphs (num_glyphs_) {}
+
+    inline int get_kerning (hb_codepoint_t left, hb_codepoint_t right) const
+    {
+      return table.get_kerning (left, right, end, num_glyphs);
+    }
+  };
+
   protected:
   HBUINT32	rowWidth;	/* The width, in bytes, of a row in the table. */
   LOffsetTo<Lookup<HBUINT16> >

src/hb-aat-layout.cc

@@ -62,12 +62,14 @@ hb_aat_layout_has_substitution (hb_face_t *face)
 }
 
 void
-hb_aat_layout_substitute (hb_font_t *font, hb_buffer_t *buffer)
+hb_aat_layout_substitute (hb_ot_shape_plan_t *plan,
+			  hb_font_t *font,
+			  hb_buffer_t *buffer)
 {
   hb_blob_t *blob;
   const AAT::morx& morx = _get_morx (font->face, &blob);
 
-  AAT::hb_aat_apply_context_t c (font, buffer, blob);
+  AAT::hb_aat_apply_context_t c (plan, font, buffer, blob);
   morx.apply (&c);
 }
 

src/hb-aat-layout.hh

@@ -29,17 +29,19 @@
 
 #include "hb.hh"
 
-#include "hb-font.hh"
+#include "hb-ot-shape.hh"
-#include "hb-buffer.hh"
-#include "hb-open-type.hh"
 
 HB_INTERNAL hb_bool_t
 hb_aat_layout_has_substitution (hb_face_t *face);
 
 HB_INTERNAL void
-hb_aat_layout_substitute (hb_font_t *font, hb_buffer_t *buffer);
+hb_aat_layout_substitute (hb_ot_shape_plan_t *plan,
+			  hb_font_t *font,
+			  hb_buffer_t *buffer);
 
 HB_INTERNAL void
-hb_aat_layout_position (hb_font_t *font, hb_buffer_t *buffer);
+hb_aat_layout_position (hb_ot_shape_plan_t *plan,
+			hb_font_t *font,
+			hb_buffer_t *buffer);
 
 #endif /* HB_AAT_LAYOUT_HH */

src/hb-ot-shape.cc

@@ -668,7 +668,7 @@ hb_ot_substitute_complex (const hb_ot_shape_context_t *c)
     hb_synthesize_glyph_classes (c);
 
   if (unlikely (c->plan->apply_morx))
-    hb_aat_layout_substitute (c->font, c->buffer);
+    hb_aat_layout_substitute (c->plan, c->font, c->buffer);
   else
     c->plan->substitute (c->font, buffer);
 }