460 lines
14 KiB
C++
460 lines
14 KiB
C++
/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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* Copyright © 2010,2011,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_GDEF_TABLE_HH
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#define HB_OT_LAYOUT_GDEF_TABLE_HH
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#include "hb-ot-layout-common-private.hh"
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#include "hb-font-private.hh"
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namespace OT {
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/*
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* Attachment List Table
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*/
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typedef ArrayOf<HBUINT16> AttachPoint; /* Array of contour point indices--in
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* increasing numerical order */
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struct AttachList
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{
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inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
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unsigned int start_offset,
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unsigned int *point_count /* IN/OUT */,
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unsigned int *point_array /* OUT */) const
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{
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unsigned int index = (this+coverage).get_coverage (glyph_id);
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if (index == NOT_COVERED)
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{
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if (point_count)
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*point_count = 0;
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return 0;
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}
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const AttachPoint &points = this+attachPoint[index];
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if (point_count) {
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const HBUINT16 *array = points.sub_array (start_offset, point_count);
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unsigned int count = *point_count;
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for (unsigned int i = 0; i < count; i++)
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point_array[i] = array[i];
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}
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return points.len;
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (coverage.sanitize (c, this) && attachPoint.sanitize (c, this));
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}
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protected:
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OffsetTo<Coverage>
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coverage; /* Offset to Coverage table -- from
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* beginning of AttachList table */
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OffsetArrayOf<AttachPoint>
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attachPoint; /* Array of AttachPoint tables
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* in Coverage Index order */
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public:
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DEFINE_SIZE_ARRAY (4, attachPoint);
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};
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/*
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* Ligature Caret Table
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*/
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struct CaretValueFormat1
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{
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friend struct CaretValue;
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private:
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inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction) const
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{
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return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_x (coordinate) : font->em_scale_y (coordinate);
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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protected:
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HBUINT16 caretValueFormat; /* Format identifier--format = 1 */
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FWORD coordinate; /* X or Y value, in design units */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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struct CaretValueFormat2
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{
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friend struct CaretValue;
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private:
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inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph_id) const
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{
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hb_position_t x, y;
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if (font->get_glyph_contour_point_for_origin (glyph_id, caretValuePoint, direction, &x, &y))
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return HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
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else
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return 0;
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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protected:
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HBUINT16 caretValueFormat; /* Format identifier--format = 2 */
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HBUINT16 caretValuePoint; /* Contour point index on glyph */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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struct CaretValueFormat3
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{
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friend struct CaretValue;
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inline hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, const VariationStore &var_store) const
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{
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return HB_DIRECTION_IS_HORIZONTAL (direction) ?
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font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) :
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font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store);
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this) && deviceTable.sanitize (c, this));
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}
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protected:
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HBUINT16 caretValueFormat; /* Format identifier--format = 3 */
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FWORD coordinate; /* X or Y value, in design units */
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OffsetTo<Device>
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deviceTable; /* Offset to Device table for X or Y
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* value--from beginning of CaretValue
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* table */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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struct CaretValue
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{
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inline hb_position_t get_caret_value (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph_id,
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const VariationStore &var_store) const
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{
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switch (u.format) {
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case 1: return u.format1.get_caret_value (font, direction);
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case 2: return u.format2.get_caret_value (font, direction, glyph_id);
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case 3: return u.format3.get_caret_value (font, direction, var_store);
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default:return 0;
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (!u.format.sanitize (c)) return_trace (false);
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switch (u.format) {
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case 1: return_trace (u.format1.sanitize (c));
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case 2: return_trace (u.format2.sanitize (c));
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case 3: return_trace (u.format3.sanitize (c));
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default:return_trace (true);
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}
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}
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protected:
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union {
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HBUINT16 format; /* Format identifier */
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CaretValueFormat1 format1;
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CaretValueFormat2 format2;
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CaretValueFormat3 format3;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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struct LigGlyph
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{
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inline unsigned int get_lig_carets (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph_id,
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const VariationStore &var_store,
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unsigned int start_offset,
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unsigned int *caret_count /* IN/OUT */,
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hb_position_t *caret_array /* OUT */) const
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{
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if (caret_count) {
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const OffsetTo<CaretValue> *array = carets.sub_array (start_offset, caret_count);
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unsigned int count = *caret_count;
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for (unsigned int i = 0; i < count; i++)
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caret_array[i] = (this+array[i]).get_caret_value (font, direction, glyph_id, var_store);
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}
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return carets.len;
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (carets.sanitize (c, this));
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}
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protected:
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OffsetArrayOf<CaretValue>
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carets; /* Offset array of CaretValue tables
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* --from beginning of LigGlyph table
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* --in increasing coordinate order */
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public:
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DEFINE_SIZE_ARRAY (2, carets);
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};
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struct LigCaretList
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{
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inline unsigned int get_lig_carets (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph_id,
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const VariationStore &var_store,
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unsigned int start_offset,
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unsigned int *caret_count /* IN/OUT */,
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hb_position_t *caret_array /* OUT */) const
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{
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unsigned int index = (this+coverage).get_coverage (glyph_id);
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if (index == NOT_COVERED)
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{
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if (caret_count)
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*caret_count = 0;
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return 0;
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}
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const LigGlyph &lig_glyph = this+ligGlyph[index];
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return lig_glyph.get_lig_carets (font, direction, glyph_id, var_store, start_offset, caret_count, caret_array);
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this));
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}
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protected:
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OffsetTo<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of LigCaretList table */
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OffsetArrayOf<LigGlyph>
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ligGlyph; /* Array of LigGlyph tables
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* in Coverage Index order */
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public:
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DEFINE_SIZE_ARRAY (4, ligGlyph);
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};
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struct MarkGlyphSetsFormat1
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{
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inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{ return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; }
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (coverage.sanitize (c, this));
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}
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protected:
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HBUINT16 format; /* Format identifier--format = 1 */
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ArrayOf<LOffsetTo<Coverage> >
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coverage; /* Array of long offsets to mark set
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* coverage tables */
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public:
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DEFINE_SIZE_ARRAY (4, coverage);
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};
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struct MarkGlyphSets
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{
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inline bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{
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switch (u.format) {
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case 1: return u.format1.covers (set_index, glyph_id);
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default:return false;
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (!u.format.sanitize (c)) return_trace (false);
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switch (u.format) {
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case 1: return_trace (u.format1.sanitize (c));
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default:return_trace (true);
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}
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}
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protected:
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union {
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HBUINT16 format; /* Format identifier */
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MarkGlyphSetsFormat1 format1;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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/*
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* GDEF -- The Glyph Definition Table
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*/
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struct GDEF
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{
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static const hb_tag_t tableTag = HB_OT_TAG_GDEF;
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enum GlyphClasses {
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UnclassifiedGlyph = 0,
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BaseGlyph = 1,
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LigatureGlyph = 2,
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MarkGlyph = 3,
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ComponentGlyph = 4
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};
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inline bool has_glyph_classes (void) const { return glyphClassDef != 0; }
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inline unsigned int get_glyph_class (hb_codepoint_t glyph) const
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{ return (this+glyphClassDef).get_class (glyph); }
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inline void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const
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{ (this+glyphClassDef).add_class (glyphs, klass); }
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inline bool has_mark_attachment_types (void) const { return markAttachClassDef != 0; }
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inline unsigned int get_mark_attachment_type (hb_codepoint_t glyph) const
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{ return (this+markAttachClassDef).get_class (glyph); }
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inline bool has_attach_points (void) const { return attachList != 0; }
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inline unsigned int get_attach_points (hb_codepoint_t glyph_id,
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unsigned int start_offset,
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unsigned int *point_count /* IN/OUT */,
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unsigned int *point_array /* OUT */) const
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{ return (this+attachList).get_attach_points (glyph_id, start_offset, point_count, point_array); }
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inline bool has_lig_carets (void) const { return ligCaretList != 0; }
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inline unsigned int get_lig_carets (hb_font_t *font,
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hb_direction_t direction,
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hb_codepoint_t glyph_id,
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unsigned int start_offset,
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unsigned int *caret_count /* IN/OUT */,
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hb_position_t *caret_array /* OUT */) const
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{ return (this+ligCaretList).get_lig_carets (font,
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direction, glyph_id, get_var_store(),
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start_offset, caret_count, caret_array); }
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inline bool has_mark_sets (void) const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; }
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inline bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const
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{ return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); }
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inline bool has_var_store (void) const { return version.to_int () >= 0x00010003u && varStore != 0; }
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inline const VariationStore &get_var_store (void) const
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{ return version.to_int () >= 0x00010003u ? this+varStore : Null(VariationStore); }
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (version.sanitize (c) &&
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likely (version.major == 1) &&
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glyphClassDef.sanitize (c, this) &&
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attachList.sanitize (c, this) &&
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ligCaretList.sanitize (c, this) &&
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markAttachClassDef.sanitize (c, this) &&
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(version.to_int () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) &&
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(version.to_int () < 0x00010003u || varStore.sanitize (c, this)));
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}
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/* glyph_props is a 16-bit integer where the lower 8-bit have bits representing
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* glyph class and other bits, and high 8-bit gthe mark attachment type (if any).
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* Not to be confused with lookup_props which is very similar. */
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inline unsigned int get_glyph_props (hb_codepoint_t glyph) const
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{
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unsigned int klass = get_glyph_class (glyph);
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static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs), "");
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static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures), "");
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static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks), "");
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switch (klass) {
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default: return 0;
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case BaseGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
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case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
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case MarkGlyph:
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klass = get_mark_attachment_type (glyph);
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return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8);
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}
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}
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protected:
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FixedVersion<>version; /* Version of the GDEF table--currently
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* 0x00010003u */
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OffsetTo<ClassDef>
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glyphClassDef; /* Offset to class definition table
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* for glyph type--from beginning of
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* GDEF header (may be Null) */
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OffsetTo<AttachList>
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attachList; /* Offset to list of glyphs with
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* attachment points--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<LigCaretList>
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ligCaretList; /* Offset to list of positioning points
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* for ligature carets--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<ClassDef>
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markAttachClassDef; /* Offset to class definition table for
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* mark attachment type--from beginning
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* of GDEF header (may be Null) */
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OffsetTo<MarkGlyphSets>
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markGlyphSetsDef; /* Offset to the table of mark set
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* definitions--from beginning of GDEF
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* header (may be NULL). Introduced
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* in version 0x00010002. */
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LOffsetTo<VariationStore>
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varStore; /* Offset to the table of Item Variation
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* Store--from beginning of GDEF
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* header (may be NULL). Introduced
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* in version 0x00010003. */
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public:
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DEFINE_SIZE_MIN (12);
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};
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} /* namespace OT */
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#endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */
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