[OT] Start adding fallback positioning

Used when there is no GPOS.

src/Makefile.am

@@ -87,6 +87,8 @@ HBSOURCES += \
 	hb-ot-shape-complex-private.hh \
 	hb-ot-shape-normalize-private.hh \
 	hb-ot-shape-normalize.cc \
+	hb-ot-shape-position-fallback-private.hh \
+	hb-ot-shape-position-fallback.cc \
 	hb-ot-shape-private.hh \
 	$(NULL)
 HBHEADERS += \

src/hb-ot-shape-position-fallback-private.hh

+/*
+ * Copyright © 2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_POSITION_FALLBACK_PRIVATE_HH
+#define HB_OT_POSITION_FALLBACK_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-ot-shape-private.hh"
+
+
+HB_INTERNAL void _hb_ot_shape_position_fallback (const hb_ot_shape_plan_t *plan,
+						 hb_font_t *font,
+						 hb_buffer_t  *buffer);
+
+#endif /* HB_OT_POSITION_FALLBACK_PRIVATE_HH */

src/hb-ot-shape-position-fallback.cc

+/*
+ * Copyright © 2011,2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-ot-shape-position-fallback-private.hh"
+
+static void
+hb_zero_mark_advances (hb_buffer_t *buffer)
+{
+  unsigned int count = buffer->len;
+  for (unsigned int i = 0; i < count; i++)
+    if (_hb_glyph_info_get_general_category (&buffer->info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
+    {
+      buffer->pos[i].x_advance = 0;
+      buffer->pos[i].y_advance = 0;
+    }
+}
+
+void
+_hb_ot_shape_position_fallback (const hb_ot_shape_plan_t *plan,
+				hb_font_t *font,
+				hb_buffer_t  *buffer)
+{
+  hb_zero_mark_advances (buffer);
+}

src/hb-ot-shape.cc

@@ -32,8 +32,9 @@
 #include "hb-shaper-impl-private.hh"
 
 #include "hb-ot-shape-private.hh"
-#include "hb-ot-shape-normalize-private.hh"
 #include "hb-ot-shape-complex-private.hh"
+#include "hb-ot-shape-normalize-private.hh"
+#include "hb-ot-shape-position-fallback-private.hh"
 
 #include "hb-ot-layout-private.hh"
 #include "hb-set-private.hh"
@@ -207,7 +208,6 @@ _hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
 
 struct hb_ot_shape_context_t
 {
-  /* Input to hb_ot_shape_internal() */
   hb_ot_shape_plan_t *plan;
   hb_font_t *font;
   hb_face_t *face;
@@ -391,18 +391,6 @@ hb_position_default (hb_ot_shape_context_t *c)
   }
 }
 
-static void
-hb_zero_mark_advances (hb_ot_shape_context_t *c)
-{
-  unsigned int count = c->buffer->len;
-  for (unsigned int i = 0; i < count; i++)
-    if (_hb_glyph_info_get_general_category (&c->buffer->info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
-    {
-      c->buffer->pos[i].x_advance = 0;
-      c->buffer->pos[i].y_advance = 0;
-    }
-}
-
 static void
 hb_ot_position_complex (hb_ot_shape_context_t *c)
 {
@@ -429,8 +417,7 @@ hb_ot_position_complex (hb_ot_shape_context_t *c)
     }
 
     c->applied_position_complex = true;
-  } else
-    hb_zero_mark_advances (c);
+  }
 
   hb_ot_layout_position_finish (c->font, c->buffer, c->plan->shaper->zero_width_attached_marks);
 
@@ -438,9 +425,9 @@ hb_ot_position_complex (hb_ot_shape_context_t *c)
 }
 
 static void
-hb_position_complex_fallback (hb_ot_shape_context_t *c HB_UNUSED)
+hb_position_complex_fallback (hb_ot_shape_context_t *c)
 {
-  /* TODO Mark pos */
+  _hb_ot_shape_position_fallback (c->plan, c->font, c->buffer);
 }
 
 static void