Update harfbuzz-ng to 0.9.24

third_party/harfbuzz-ng/src/hb-ot-layout-private.hh

Index: third_party/harfbuzz-ng/src/hb-ot-layout-private.hh
diff --git a/third_party/harfbuzz-ng/src/hb-ot-layout-private.hh b/third_party/harfbuzz-ng/src/hb-ot-layout-private.hh
index 4866c41912530838e61bec0b056f45201679e708..139e33fe7a3e189548e262accd6ae3d2b0ba1483 100644
--- a/third_party/harfbuzz-ng/src/hb-ot-layout-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-ot-layout-private.hh
@@ -1,6 +1,6 @@
 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
- * Copyright © 2012  Google, Inc.
+ * Copyright © 2012,2013  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -38,34 +38,179 @@
 #include "hb-set-private.hh"
 
 
-/* buffer var allocations, used during the GSUB/GPOS processing */
-#define glyph_props()		var1.u16[0] /* GDEF glyph properties */
-#define syllable()		var1.u8[2] /* GSUB/GPOS shaping boundaries */
-#define lig_props()		var1.u8[3] /* GSUB/GPOS ligature tracking */
+/*
+ * GDEF
+ */
+
+typedef enum
+{
+  /* The following three match LookupFlags::Ignore* numbers. */
+  HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH	= 0x02u,
+  HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE	= 0x04u,
+  HB_OT_LAYOUT_GLYPH_PROPS_MARK		= 0x08u,
+
+  /* The following are used internally; not derived from GDEF. */
+  HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED	= 0x10u,
+  HB_OT_LAYOUT_GLYPH_PROPS_LIGATED	= 0x20u,
+
+  HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE     = HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
+					  HB_OT_LAYOUT_GLYPH_PROPS_LIGATED
+} hb_ot_layout_glyph_class_mask_t;
+
+
+/*
+ * GSUB/GPOS
+ */
+
+HB_INTERNAL hb_bool_t
+hb_ot_layout_lookup_would_substitute_fast (hb_face_t            *face,
+					   unsigned int          lookup_index,
+					   const hb_codepoint_t *glyphs,
+					   unsigned int          glyphs_length,
+					   hb_bool_t             zero_context);
+
+
+/* Should be called before all the substitute_lookup's are done. */
+HB_INTERNAL void
+hb_ot_layout_substitute_start (hb_font_t    *font,
+			       hb_buffer_t  *buffer);
+
+
+struct hb_ot_layout_lookup_accelerator_t;
+
+namespace OT {
+  struct hb_apply_context_t;
+  struct SubstLookup;
+}
+
+HB_INTERNAL void
+hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
+				const OT::SubstLookup &lookup,
+				const hb_ot_layout_lookup_accelerator_t &accel);
+
+
+/* Should be called after all the substitute_lookup's are done */
+HB_INTERNAL void
+hb_ot_layout_substitute_finish (hb_font_t    *font,
+				hb_buffer_t  *buffer);
+
+
+/* Should be called before all the position_lookup's are done.  Resets positions to zero. */
+HB_INTERNAL void
+hb_ot_layout_position_start (hb_font_t    *font,
+			     hb_buffer_t  *buffer);
+
+/* Should be called after all the position_lookup's are done */
+HB_INTERNAL void
+hb_ot_layout_position_finish (hb_font_t    *font,
+			      hb_buffer_t  *buffer);
+
+
+
+/*
+ * hb_ot_layout_t
+ */
+
+namespace OT {
+  struct GDEF;
+  struct GSUB;
+  struct GPOS;
+}
+
+struct hb_ot_layout_lookup_accelerator_t
+{
+  template <typename TLookup>
+  inline void init (const TLookup &lookup)
+  {
+    digest.init ();
+    lookup.add_coverage (&digest);
+  }
+
+  template <typename TLookup>
+  inline void fini (const TLookup &lookup)
+  {
+  }
+
+  hb_set_digest_t digest;
+};
+
+struct hb_ot_layout_t
+{
+  hb_blob_t *gdef_blob;
+  hb_blob_t *gsub_blob;
+  hb_blob_t *gpos_blob;
+
+  const struct OT::GDEF *gdef;
+  const struct OT::GSUB *gsub;
+  const struct OT::GPOS *gpos;
+
+  unsigned int gsub_lookup_count;
+  unsigned int gpos_lookup_count;
+
+  hb_ot_layout_lookup_accelerator_t *gsub_accels;
+  hb_ot_layout_lookup_accelerator_t *gpos_accels;
+};
+
+
+HB_INTERNAL hb_ot_layout_t *
+_hb_ot_layout_create (hb_face_t *face);
+
+HB_INTERNAL void
+_hb_ot_layout_destroy (hb_ot_layout_t *layout);
+
+
+#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
+
+
+/*
+ * Buffer var routines.
+ */
 
 /* buffer var allocations, used during the entire shaping process */
 #define unicode_props0()	var2.u8[0]
 #define unicode_props1()	var2.u8[1]
 
+/* buffer var allocations, used during the GSUB/GPOS processing */
+#define glyph_props()		var1.u16[0] /* GDEF glyph properties */
+#define lig_props()		var1.u8[2] /* GSUB/GPOS ligature tracking */
+#define syllable()		var1.u8[3] /* GSUB/GPOS shaping boundaries */
+
+/* unicode_props */
+
+enum {
+  MASK0_ZWJ       = 0x20u,
+  MASK0_ZWNJ      = 0x40u,
+  MASK0_IGNORABLE = 0x80u,
+  MASK0_GEN_CAT   = 0x1Fu
+};
 
 inline void
 _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
 {
+  /* XXX This shouldn't be inlined, or at least not while is_default_ignorable() is inline. */
   info->unicode_props0() = ((unsigned int) unicode->general_category (info->codepoint)) |
-			   (unicode->is_default_ignorable (info->codepoint) ? 0x80 : 0) |
-			   (info->codepoint == 0x200C ? 0x40 : 0) |
-			   (info->codepoint == 0x200D ? 0x20 : 0);
+			   (unicode->is_default_ignorable (info->codepoint) ? MASK0_IGNORABLE : 0) |
+			   (info->codepoint == 0x200C ? MASK0_ZWNJ : 0) |
+			   (info->codepoint == 0x200D ? MASK0_ZWJ : 0);
   info->unicode_props1() = unicode->modified_combining_class (info->codepoint);
 }
 
+inline void
+_hb_glyph_info_set_general_category (hb_glyph_info_t *info,
+				     hb_unicode_general_category_t gen_cat)
+{
+  info->unicode_props0() = (unsigned int) gen_cat | ((info->unicode_props0()) & ~MASK0_GEN_CAT);
+}
+
 inline hb_unicode_general_category_t
 _hb_glyph_info_get_general_category (const hb_glyph_info_t *info)
 {
-  return (hb_unicode_general_category_t) (info->unicode_props0() & 0x1F);
+  return (hb_unicode_general_category_t) (info->unicode_props0() & MASK0_GEN_CAT);
 }
 
 inline void
-_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info, unsigned int modified_class)
+_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info,
+					     unsigned int modified_class)
 {
   info->unicode_props1() = modified_class;
 }
@@ -79,43 +224,28 @@ _hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
 inline hb_bool_t
 _hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
 {
-  return !!(info->unicode_props0() & 0x80);
+  return !!(info->unicode_props0() & MASK0_IGNORABLE);
 }
 
 inline hb_bool_t
 _hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
 {
-  return !!(info->unicode_props0() & 0x40);
+  return !!(info->unicode_props0() & MASK0_ZWNJ);
 }
 
 inline hb_bool_t
 _hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
 {
-  return !!(info->unicode_props0() & 0x20);
+  return !!(info->unicode_props0() & MASK0_ZWJ);
 }
 
+inline void
+_hb_glyph_info_flip_joiners (hb_glyph_info_t *info)
+{
+  info->unicode_props0() ^= MASK0_ZWNJ | MASK0_ZWJ;
+}
 
-#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
-
-/*
- * GDEF
- */
-
-typedef enum {
-  HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED	= 1 << HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED,
-  HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH	= 1 << HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH,
-  HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE	= 1 << HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE,
-  HB_OT_LAYOUT_GLYPH_PROPS_MARK		= 1 << HB_OT_LAYOUT_GLYPH_CLASS_MARK,
-  HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT	= 1 << HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT
-} hb_ot_layout_glyph_class_mask_t;
-
-
-
-/*
- * GSUB/GPOS
- */
-
-/* lig_id / lig_comp
+/* lig_props: aka lig_id / lig_comp
  *
  * When a ligature is formed:
  *
@@ -125,7 +255,9 @@ typedef enum {
  *   - The marks get lig_comp > 0, reflecting which component of the ligature
  *     they were applied to.
  *   - This is used in GPOS to attach marks to the right component of a ligature
- *     in MarkLigPos.
+ *     in MarkLigPos,
+ *   - Note that when marks are ligated together, much of the above is skipped
+ *     and the current lig_id reused.
  *
  * When a multiple-substitution is done:
  *
@@ -135,139 +267,159 @@ typedef enum {
  *     multiple substitution in MarkBasePos.
  *
  * The numbers are also used in GPOS to do mark-to-mark positioning only
- * to marks that belong to the same component of a ligature in MarkMarPos.
+ * to marks that belong to the same component of the same ligature.
  */
+
+static inline void
+_hb_glyph_info_clear_lig_props (hb_glyph_info_t *info)
+{
+  info->lig_props() = 0;
+}
+
 #define IS_LIG_BASE 0x10
+
 static inline void
-set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps)
+_hb_glyph_info_set_lig_props_for_ligature (hb_glyph_info_t *info,
+					   unsigned int lig_id,
+					   unsigned int lig_num_comps)
 {
-  info.lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
+  info->lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
 }
+
 static inline void
-set_lig_props_for_mark (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp)
+_hb_glyph_info_set_lig_props_for_mark (hb_glyph_info_t *info,
+				       unsigned int lig_id,
+				       unsigned int lig_comp)
 {
-  info.lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
+  info->lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
 }
+
 static inline void
-set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp)
+_hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp)
 {
-  set_lig_props_for_mark (info, 0, comp);
+  _hb_glyph_info_set_lig_props_for_mark (info, 0, comp);
 }
 
 static inline unsigned int
-get_lig_id (const hb_glyph_info_t &info)
+_hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
 {
-  return info.lig_props() >> 5;
+  return info->lig_props() >> 5;
 }
+
 static inline bool
-is_a_ligature (const hb_glyph_info_t &info)
+_hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
 {
-  return !!(info.lig_props() & IS_LIG_BASE);
+  return !!(info->lig_props() & IS_LIG_BASE);
 }
+
 static inline unsigned int
-get_lig_comp (const hb_glyph_info_t &info)
+_hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
 {
-  if (is_a_ligature (info))
+  if (_hb_glyph_info_ligated_internal (info))
     return 0;
   else
-    return info.lig_props() & 0x0F;
+    return info->lig_props() & 0x0F;
 }
+
 static inline unsigned int
-get_lig_num_comps (const hb_glyph_info_t &info)
+_hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
 {
-  if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info))
-    return info.lig_props() & 0x0F;
+  if ((info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) &&
+      _hb_glyph_info_ligated_internal (info))
+    return info->lig_props() & 0x0F;
   else
     return 1;
 }
 
-static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
+static inline uint8_t
+_hb_allocate_lig_id (hb_buffer_t *buffer) {
   uint8_t lig_id = buffer->next_serial () & 0x07;
   if (unlikely (!lig_id))
-    lig_id = allocate_lig_id (buffer); /* in case of overflow */
+    lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
   return lig_id;
 }
 
+/* glyph_props: */
 
-HB_INTERNAL hb_bool_t
-hb_ot_layout_lookup_would_substitute_fast (hb_face_t            *face,
-					   unsigned int          lookup_index,
-					   const hb_codepoint_t *glyphs,
-					   unsigned int          glyphs_length,
-					   hb_bool_t             zero_context);
-
-
-/* Should be called before all the substitute_lookup's are done. */
-HB_INTERNAL void
-hb_ot_layout_substitute_start (hb_font_t    *font,
-			       hb_buffer_t  *buffer);
-
-HB_INTERNAL hb_bool_t
-hb_ot_layout_substitute_lookup (hb_font_t    *font,
-				hb_buffer_t  *buffer,
-				unsigned int  lookup_index,
-				hb_mask_t     mask,
-				hb_bool_t     auto_zwj);
-
-/* Should be called after all the substitute_lookup's are done */
-HB_INTERNAL void
-hb_ot_layout_substitute_finish (hb_font_t    *font,
-				hb_buffer_t  *buffer);
-
-
-/* Should be called before all the position_lookup's are done.  Resets positions to zero. */
-HB_INTERNAL void
-hb_ot_layout_position_start (hb_font_t    *font,
-			     hb_buffer_t  *buffer);
-
-HB_INTERNAL hb_bool_t
-hb_ot_layout_position_lookup (hb_font_t    *font,
-			      hb_buffer_t  *buffer,
-			      unsigned int  lookup_index,
-			      hb_mask_t     mask,
-			      hb_bool_t     auto_zwj);
-
-/* Should be called after all the position_lookup's are done */
-HB_INTERNAL void
-hb_ot_layout_position_finish (hb_font_t    *font,
-			      hb_buffer_t  *buffer);
+inline void
+_hb_glyph_info_set_glyph_props (hb_glyph_info_t *info, unsigned int props)
+{
+  info->glyph_props() = props;
+}
 
+inline unsigned int
+_hb_glyph_info_get_glyph_props (const hb_glyph_info_t *info)
+{
+  return info->glyph_props();
+}
 
+inline bool
+_hb_glyph_info_is_base_glyph (const hb_glyph_info_t *info)
+{
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH);
+}
 
-/*
- * hb_ot_layout_t
- */
+inline bool
+_hb_glyph_info_is_ligature (const hb_glyph_info_t *info)
+{
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE);
+}
 
-namespace OT {
-  struct GDEF;
-  struct GSUB;
-  struct GPOS;
+inline bool
+_hb_glyph_info_is_mark (const hb_glyph_info_t *info)
+{
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK);
 }
 
-struct hb_ot_layout_t
+static inline bool
+_hb_glyph_info_substituted (const hb_glyph_info_t *info)
 {
-  hb_blob_t *gdef_blob;
-  hb_blob_t *gsub_blob;
-  hb_blob_t *gpos_blob;
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
+}
 
-  const struct OT::GDEF *gdef;
-  const struct OT::GSUB *gsub;
-  const struct OT::GPOS *gpos;
+static inline bool
+_hb_glyph_info_ligated (const hb_glyph_info_t *info)
+{
+  return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED);
+}
 
-  unsigned int gsub_lookup_count;
-  unsigned int gpos_lookup_count;
+/* Allocation / deallocation. */
 
-  hb_set_digest_t *gsub_digests;
-  hb_set_digest_t *gpos_digests;
-};
+inline void
+_hb_buffer_allocate_unicode_vars (hb_buffer_t *buffer)
+{
+  HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props0);
+  HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props1);
+}
 
+inline void
+_hb_buffer_deallocate_unicode_vars (hb_buffer_t *buffer)
+{
+  HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props0);
+  HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props1);
+}
 
-HB_INTERNAL hb_ot_layout_t *
-_hb_ot_layout_create (hb_face_t *face);
+inline void
+_hb_buffer_allocate_gsubgpos_vars (hb_buffer_t *buffer)
+{
+  HB_BUFFER_ALLOCATE_VAR (buffer, glyph_props);
+  HB_BUFFER_ALLOCATE_VAR (buffer, lig_props);
+  HB_BUFFER_ALLOCATE_VAR (buffer, syllable);
+}
 
-HB_INTERNAL void
-_hb_ot_layout_destroy (hb_ot_layout_t *layout);
+inline void
+_hb_buffer_deallocate_gsubgpos_vars (hb_buffer_t *buffer)
+{
+  HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
+  HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
+  HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props);
+}
 
+/* Make sure no one directly touches our props... */
+#undef unicode_props0
+#undef unicode_props1
+#undef lig_props
+#undef glyph_props
 
 
 #endif /* HB_OT_LAYOUT_PRIVATE_HH */