harfbuzz: check in harfbuzz-ng, add gyp define to use it

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

+/*
+ * Copyright (C) 2007,2008,2009  Red Hat, Inc.
+ * Copyright (C) 2010  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_PRIVATE_HH
+#define HB_OT_LAYOUT_GDEF_PRIVATE_HH
+
+#include "hb-ot-layout-common-private.hh"
+
+#include "hb-font-private.h"
+
+HB_BEGIN_DECLS
+
+
+/*
+ * 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) (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 ();
+    return coverage.sanitize (c, this)
+        && attachPoint.sanitize (c, this);
+  }
+
+  private:
+  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 int get_caret_value (hb_ot_layout_context_t *c, hb_direction_t direction, hb_codepoint_t glyph_id HB_UNUSED) const
+  {
+    return HB_DIRECTION_IS_HORIZONTAL (direction) ? c->scale_x (coordinate) : c->scale_y (coordinate);
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    return c->check_struct (this);
+  }
+
+  private:
+  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 int get_caret_value (hb_ot_layout_context_t *c, hb_direction_t direction, hb_codepoint_t glyph_id) const
+  {
+    hb_position_t x, y;
+    if (hb_font_get_contour_point (c->font, c->face, caretValuePoint, glyph_id, &x, &y))
+      return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
+    else
+      return 0;
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    return c->check_struct (this);
+  }
+
+  private:
+  USHORT        caretValueFormat;       /* Format identifier--format = 2 */
+  USHORT        caretValuePoint;        /* Contour point index on glyph */
+  public:
+  DEFINE_SIZE_STATIC (4);
+};
+
+struct CaretValueFormat3
+{
+  friend struct CaretValue;
+
+  inline int get_caret_value (hb_ot_layout_context_t *c, hb_direction_t direction, hb_codepoint_t glyph_id) const
+  {
+    return HB_DIRECTION_IS_HORIZONTAL (direction) ?
+           c->scale_x (coordinate) + (this+deviceTable).get_x_delta (c) :
+           c->scale_y (coordinate) + (this+deviceTable).get_y_delta (c);
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    return c->check_struct (this)
+        && deviceTable.sanitize (c, this);
+  }
+
+  private:
+  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 int get_caret_value (hb_ot_layout_context_t *c, hb_direction_t direction, hb_codepoint_t glyph_id) const
+  {
+    switch (u.format) {
+    case 1: return u.format1.get_caret_value (c, direction, glyph_id);
+    case 2: return u.format2.get_caret_value (c, direction, glyph_id);
+    case 3: return u.format3.get_caret_value (c, direction, glyph_id);
+    default:return 0;
+    }
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    if (!u.format.sanitize (c)) return false;
+    switch (u.format) {
+    case 1: return u.format1.sanitize (c);
+    case 2: return u.format2.sanitize (c);
+    case 3: return u.format3.sanitize (c);
+    default:return true;
+    }
+  }
+
+  private:
+  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_ot_layout_context_t *c,
+                                      hb_direction_t direction,
+                                      hb_codepoint_t glyph_id,
+                                      unsigned int start_offset,
+                                      unsigned int *caret_count /* IN/OUT */,
+                                      int *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 (c, direction, glyph_id);
+    }
+
+    return carets.len;
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    return carets.sanitize (c, this);
+  }
+
+  private:
+  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_ot_layout_context_t *c,
+                                      hb_direction_t direction,
+                                      hb_codepoint_t glyph_id,
+                                      unsigned int start_offset,
+                                      unsigned int *caret_count /* IN/OUT */,
+                                      int *caret_array /* OUT */) const
+  {
+    unsigned int index = (this+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 (c, direction, glyph_id, start_offset, caret_count, caret_array);
+  }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    return coverage.sanitize (c, this)
+        && ligGlyph.sanitize (c, this);
+  }
+
+  private:
+  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 ();
+    return coverage.sanitize (c, this);
+  }
+
+  private:
+  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 ();
+    if (!u.format.sanitize (c)) return false;
+    switch (u.format) {
+    case 1: return u.format1.sanitize (c);
+    default:return true;
+    }
+  }
+
+  private:
+  union {
+  USHORT                format;         /* Format identifier */
+  MarkGlyphSetsFormat1  format1;
+  } u;
+  public:
+  DEFINE_SIZE_UNION (2, format);
+};
+
+
+/*
+ * GDEF
+ */
+
+struct GDEF
+{
+  static const hb_tag_t Tag     = HB_OT_TAG_GDEF;
+
+  enum {
+    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 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_ot_layout_context_t *c,
+                                      hb_direction_t direction,
+                                      hb_codepoint_t glyph_id,
+                                      unsigned int start_offset,
+                                      unsigned int *caret_count /* IN/OUT */,
+                                      int *caret_array /* OUT */) const
+  { return (this+ligCaretList).get_lig_carets (c, direction, glyph_id, start_offset, caret_count, caret_array); }
+
+  inline bool has_mark_sets (void) const { return version >= 0x00010002 && markGlyphSetsDef[0] != 0; }
+  inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
+  { return version >= 0x00010002 && (this+markGlyphSetsDef[0]).covers (set_index, glyph_id); }
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    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 < 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);
+
+    switch (klass) {
+    default:
+    case UnclassifiedGlyph:     return HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED;
+    case BaseGlyph:             return HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH;
+    case LigatureGlyph:         return HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE;
+    case ComponentGlyph:        return HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT;
+    case MarkGlyph:
+          klass = get_mark_attachment_type (glyph);
+          return HB_OT_LAYOUT_GLYPH_CLASS_MARK | (klass << 8);
+    }
+  }
+
+
+  private:
+  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);
+};
+
+
+HB_END_DECLS
+
+#endif /* HB_OT_LAYOUT_GDEF_PRIVATE_HH */