The Tor Browser: gfx/harfbuzz/src/hb-ot-layout-private.hh@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-ot-layout-private.hh@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-ot-layout-private.hh

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2012,2013  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.
  *
  * Red Hat Author(s): Behdad Esfahbod
  * Google Author(s): Behdad Esfahbod
  */
 #ifndef HB_OT_LAYOUT_PRIVATE_HH
 #define HB_OT_LAYOUT_PRIVATE_HH
 #include "hb-private.hh"
 #include "hb-font-private.hh"
 #include "hb-buffer-private.hh"
 #include "hb-set-private.hh"
 /*
  * 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) ? 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() & MASK0_GEN_CAT);
 }
 inline void
 _hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info,
 					     unsigned int modified_class)
 {
   info->unicode_props1() = modified_class;
 }
 inline unsigned int
 _hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
 {
   return info->unicode_props1();
 }
 inline hb_bool_t
 _hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
 {
   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() & MASK0_ZWNJ);
 }
 inline hb_bool_t
 _hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
 {
   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;
 }
 /* lig_props: aka lig_id / lig_comp
  *
  * When a ligature is formed:
  *
  *   - The ligature glyph and any marks in between all the same newly allocated
  *     lig_id,
  *   - The ligature glyph will get lig_num_comps set to the number of components
  *   - 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,
  *   - 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:
  *
  *   - All resulting glyphs will have lig_id = 0,
  *   - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
  *   - This is used in GPOS to attach marks to the first component of a
  *     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 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
 _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);
 }
 static inline void
 _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);
 }
 static inline void
 _hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp)
 {
   _hb_glyph_info_set_lig_props_for_mark (info, 0, comp);
 }
 static inline unsigned int
 _hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
 {
   return info->lig_props() >> 5;
 }
 static inline bool
 _hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
 {
   return !!(info->lig_props() & IS_LIG_BASE);
 }
 static inline unsigned int
 _hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
 {
   if (_hb_glyph_info_ligated_internal (info))
     return 0;
   else
     return info->lig_props() & 0x0F;
 }
 static inline unsigned int
 _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
 {
   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
 _hb_allocate_lig_id (hb_buffer_t *buffer) {
   uint8_t lig_id = buffer->next_serial () & 0x07;
   if (unlikely (!lig_id))
     lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
   return lig_id;
 }
 /* glyph_props: */
 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);
 }
 inline bool
 _hb_glyph_info_is_ligature (const hb_glyph_info_t *info)
 {
   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE);
 }
 inline bool
 _hb_glyph_info_is_mark (const hb_glyph_info_t *info)
 {
   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK);
 }
 static inline bool
 _hb_glyph_info_substituted (const hb_glyph_info_t *info)
 {
   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
 }
 static inline bool
 _hb_glyph_info_ligated (const hb_glyph_info_t *info)
 {
   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED);
 }
 /* Allocation / deallocation. */
 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);
 }
 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);
 }
 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 */

The Tor Browser / annotate

gfx/harfbuzz/src/hb-ot-layout-private.hh@6474c204b198 (annotated)

gfx/harfbuzz/src/hb-ot-layout-private.hh