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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /gfx/harfbuzz/src/hb-ot-layout-gdef-table.hh
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+/*
+ * 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) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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) 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) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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, const VariationStore &var_store) const
+ {
+ return HB_DIRECTION_IS_HORIZONTAL (direction) ?
+ font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) :
+ font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store);
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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 VariationStore &var_store) const
+ {
+ switch (u.format) {
+ case 1: return u.format1.get_caret_value (font, direction);
+ case 2: return u.format2.get_caret_value (font, direction, glyph_id);
+ case 3: return u.format3.get_caret_value (font, direction, var_store);
+ default:return 0;
+ }
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (!u.format.sanitize (c)) return_trace (false);
+ switch (u.format) {
+ case 1: return_trace (u.format1.sanitize (c));
+ case 2: return_trace (u.format2.sanitize (c));
+ case 3: return_trace (u.format3.sanitize (c));
+ default:return_trace (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,
+ const VariationStore &var_store,
+ 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, var_store);
+ }
+
+ return carets.len;
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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,
+ const VariationStore &var_store,
+ 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, var_store, start_offset, caret_count, caret_array);
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (coverage.sanitize (c, this));
+ }
+
+ protected:
+ USHORT format; /* Format identifier--format = 1 */
+ ArrayOf<OffsetTo<Coverage, ULONG> >
+ 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) const
+ {
+ TRACE_SANITIZE (this);
+ if (!u.format.sanitize (c)) return_trace (false);
+ switch (u.format) {
+ case 1: return_trace (u.format1.sanitize (c));
+ default:return_trace (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, get_var_store(),
+ start_offset, caret_count, caret_array); }
+
+ inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; }
+ inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
+ { return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); }
+
+ inline bool has_var_store (void) const { return version.to_int () >= 0x00010003u && varStore != 0; }
+ inline const VariationStore &get_var_store (void) const
+ { return version.to_int () >= 0x00010003u ? this+varStore : Null(VariationStore); }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (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 () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) &&
+ (version.to_int () < 0x00010003u || varStore.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
+ * 0x00010003u */
+ 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; /* Offset to the table of mark set
+ * definitions--from beginning of GDEF
+ * header (may be NULL). Introduced
+ * in version 0x00010002. */
+ OffsetTo<VariationStore, ULONG>
+ varStore; /* Offset to the table of Item Variation
+ * Store--from beginning of GDEF
+ * header (may be NULL). Introduced
+ * in version 0x00010003. */
+ public:
+ DEFINE_SIZE_MIN (12);
+};
+
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */