The Tor Browser: gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2010,2011,2012  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.
  *
  * Red Hat Author(s): Behdad Esfahbod
  * Google Author(s): Behdad Esfahbod
  */
 #ifndef HB_OT_LAYOUT_GDEF_TABLE_HH
 #define HB_OT_LAYOUT_GDEF_TABLE_HH
 #include "hb-ot-layout-common-private.hh"
 #include "hb-font-private.hh"
 namespace OT {
 /*
  * Attachment List Table
  */
 typedef ArrayOf<USHORT> AttachPoint;	/* Array of contour point indices--in
 					 * increasing numerical order */
 struct AttachList
 {
   inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
 					 unsigned int start_offset,
 					 unsigned int *point_count /* IN/OUT */,
 					 unsigned int *point_array /* OUT */) const
   {
     unsigned int index = (this+coverage).get_coverage (glyph_id);
     if (index == NOT_COVERED)
     {
       if (point_count)
 	*point_count = 0;
       return 0;
     }
     const AttachPoint &points = this+attachPoint[index];
     if (point_count) {
       const USHORT *array = points.sub_array (start_offset, point_count);
       unsigned int count = *point_count;
       for (unsigned int i = 0; i < count; i++)
 	point_array[i] = array[i];
     }
     return points.len;
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (coverage.sanitize (c, this) && attachPoint.sanitize (c, this));
   }
   protected:
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table -- from
 					 * beginning of AttachList table */
   OffsetArrayOf<AttachPoint>
 		attachPoint;		/* Array of AttachPoint tables
 					 * in Coverage Index order */
   public:
   DEFINE_SIZE_ARRAY (4, attachPoint);
 };
 /*
  * Ligature Caret Table
  */
 struct CaretValueFormat1
 {
   friend struct CaretValue;
   private:
   inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const
   {
     return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate);
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this));
   }
   protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 1 */
   SHORT		coordinate;		/* X or Y value, in design units */
   public:
   DEFINE_SIZE_STATIC (4);
 };
 struct CaretValueFormat2
 {
   friend struct CaretValue;
   private:
   inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
   {
     hb_position_t x, y;
     if (font->get_glyph_contour_point_for_origin (glyph_id, caretValuePoint, direction, &x, &y))
       return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
     else
       return 0;
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this));
   }
   protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 2 */
   USHORT	caretValuePoint;	/* Contour point index on glyph */
   public:
   DEFINE_SIZE_STATIC (4);
 };
 struct CaretValueFormat3
 {
   friend struct CaretValue;
   inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const
   {
     return HB_DIRECTION_IS_HORIZONTAL (direction) ?
            font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font) :
            font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font);
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this) && deviceTable.sanitize (c, this));
   }
   protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 3 */
   SHORT		coordinate;		/* X or Y value, in design units */
   OffsetTo<Device>
 		deviceTable;		/* Offset to Device table for X or Y
 					 * value--from beginning of CaretValue
 					 * table */
   public:
   DEFINE_SIZE_STATIC (6);
 };
 struct CaretValue
 {
   inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
   {
     switch (u.format) {
     case 1: return u.format1.get_caret_value (font, direction, glyph_id);
     case 2: return u.format2.get_caret_value (font, direction, glyph_id);
     case 3: return u.format3.get_caret_value (font, direction, glyph_id);
     default:return 0;
     }
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     if (!u.format.sanitize (c)) return TRACE_RETURN (false);
     switch (u.format) {
     case 1: return TRACE_RETURN (u.format1.sanitize (c));
     case 2: return TRACE_RETURN (u.format2.sanitize (c));
     case 3: return TRACE_RETURN (u.format3.sanitize (c));
     default:return TRACE_RETURN (true);
     }
   }
   protected:
   union {
   USHORT		format;		/* Format identifier */
   CaretValueFormat1	format1;
   CaretValueFormat2	format2;
   CaretValueFormat3	format3;
   } u;
   public:
   DEFINE_SIZE_UNION (2, format);
 };
 struct LigGlyph
 {
   inline unsigned int get_lig_carets (hb_font_t *font,
 				      hb_direction_t direction,
 				      hb_codepoint_t glyph_id,
 				      unsigned int start_offset,
 				      unsigned int *caret_count /* IN/OUT */,
 				      hb_position_t *caret_array /* OUT */) const
   {
     if (caret_count) {
       const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count);
       unsigned int count = *caret_count;
       for (unsigned int i = 0; i < count; i++)
 	caret_array[i] = (this+array[i]).get_caret_value (font, direction, glyph_id);
     }
     return carets.len;
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (carets.sanitize (c, this));
   }
   protected:
   OffsetArrayOf<CaretValue>
 		carets;			/* Offset array of CaretValue tables
 					 * --from beginning of LigGlyph table
 					 * --in increasing coordinate order */
   public:
   DEFINE_SIZE_ARRAY (2, carets);
 };
 struct LigCaretList
 {
   inline unsigned int get_lig_carets (hb_font_t *font,
 				      hb_direction_t direction,
 				      hb_codepoint_t glyph_id,
 				      unsigned int start_offset,
 				      unsigned int *caret_count /* IN/OUT */,
 				      hb_position_t *caret_array /* OUT */) const
   {
     unsigned int index = (this+coverage).get_coverage (glyph_id);
     if (index == NOT_COVERED)
     {
       if (caret_count)
 	*caret_count = 0;
       return 0;
     }
     const LigGlyph &lig_glyph = this+ligGlyph[index];
     return lig_glyph.get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array);
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this));
   }
   protected:
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
 					 * beginning of LigCaretList table */
   OffsetArrayOf<LigGlyph>
 		ligGlyph;		/* Array of LigGlyph tables
 					 * in Coverage Index order */
   public:
   DEFINE_SIZE_ARRAY (4, ligGlyph);
 };
 struct MarkGlyphSetsFormat1
 {
   inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
   { return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (coverage.sanitize (c, this));
   }
   protected:
   USHORT	format;			/* Format identifier--format = 1 */
   LongOffsetArrayOf<Coverage>
 		coverage;		/* Array of long offsets to mark set
 					 * coverage tables */
   public:
   DEFINE_SIZE_ARRAY (4, coverage);
 };
 struct MarkGlyphSets
 {
   inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
   {
     switch (u.format) {
     case 1: return u.format1.covers (set_index, glyph_id);
     default:return false;
     }
   }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     if (!u.format.sanitize (c)) return TRACE_RETURN (false);
     switch (u.format) {
     case 1: return TRACE_RETURN (u.format1.sanitize (c));
     default:return TRACE_RETURN (true);
     }
   }
   protected:
   union {
   USHORT		format;		/* Format identifier */
   MarkGlyphSetsFormat1	format1;
   } u;
   public:
   DEFINE_SIZE_UNION (2, format);
 };
 /*
  * GDEF -- The Glyph Definition Table
  */
 struct GDEF
 {
   static const hb_tag_t tableTag	= HB_OT_TAG_GDEF;
   enum GlyphClasses {
     UnclassifiedGlyph	= 0,
     BaseGlyph		= 1,
     LigatureGlyph	= 2,
     MarkGlyph		= 3,
     ComponentGlyph	= 4
   };
   inline bool has_glyph_classes (void) const { return glyphClassDef != 0; }
   inline unsigned int get_glyph_class (hb_codepoint_t glyph) const
   { return (this+glyphClassDef).get_class (glyph); }
   inline void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const
   { (this+glyphClassDef).add_class (glyphs, klass); }
   inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; }
   inline unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const
   { return (this+markAttachClassDef).get_class (glyph); }
   inline bool has_attach_points (void) const { return attachList != 0; }
   inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
 					 unsigned int start_offset,
 					 unsigned int *point_count /* IN/OUT */,
 					 unsigned int *point_array /* OUT */) const
   { return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); }
   inline bool has_lig_carets (void) const { return ligCaretList != 0; }
   inline unsigned int get_lig_carets (hb_font_t *font,
 				      hb_direction_t direction,
 				      hb_codepoint_t glyph_id,
 				      unsigned int start_offset,
 				      unsigned int *caret_count /* IN/OUT */,
 				      hb_position_t *caret_array /* OUT */) const
   { return (this+ligCaretList).get_lig_carets (font, direction, glyph_id, start_offset, caret_count, caret_array); }
   inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002 && markGlyphSetsDef[0] != 0; }
   inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
   { return version.to_int () >= 0x00010002 && (this+markGlyphSetsDef[0]).covers (set_index, glyph_id); }
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (version.sanitize (c) &&
 			 likely (version.major == 1) &&
 			 glyphClassDef.sanitize (c, this) &&
 			 attachList.sanitize (c, this) &&
 			 ligCaretList.sanitize (c, this) &&
 			 markAttachClassDef.sanitize (c, this) &&
 			 (version.to_int () < 0x00010002 || markGlyphSetsDef[0].sanitize (c, this)));
   }
   /* glyph_props is a 16-bit integer where the lower 8-bit have bits representing
    * glyph class and other bits, and high 8-bit gthe mark attachment type (if any).
    * Not to be confused with lookup_props which is very similar. */
   inline unsigned int get_glyph_props (hb_codepoint_t glyph) const
   {
     unsigned int klass = get_glyph_class (glyph);
     ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs);
     ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures);
     ASSERT_STATIC ((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks);
     switch (klass) {
     default:			return 0;
     case BaseGlyph:		return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
     case LigatureGlyph:		return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
     case MarkGlyph:
 	  klass = get_mark_attachment_type (glyph);
 	  return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8);
     }
   }
   protected:
   FixedVersion	version;		/* Version of the GDEF table--currently
 					 * 0x00010002 */
   OffsetTo<ClassDef>
 		glyphClassDef;		/* Offset to class definition table
 					 * for glyph type--from beginning of
 					 * GDEF header (may be Null) */
   OffsetTo<AttachList>
 		attachList;		/* Offset to list of glyphs with
 					 * attachment points--from beginning
 					 * of GDEF header (may be Null) */
   OffsetTo<LigCaretList>
 		ligCaretList;		/* Offset to list of positioning points
 					 * for ligature carets--from beginning
 					 * of GDEF header (may be Null) */
   OffsetTo<ClassDef>
 		markAttachClassDef;	/* Offset to class definition table for
 					 * mark attachment type--from beginning
 					 * of GDEF header (may be Null) */
   OffsetTo<MarkGlyphSets>
 		markGlyphSetsDef[VAR];	/* Offset to the table of mark set
 					 * definitions--from beginning of GDEF
 					 * header (may be NULL).  Introduced
 					 * in version 00010002. */
   public:
   DEFINE_SIZE_ARRAY (12, markGlyphSetsDef);
 };
 } /* namespace OT */
 #endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */

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gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh