author | prr |
Fri, 01 Mar 2019 16:59:19 -0800 | |
changeset 54232 | 7c11a7cc7c1d |
parent 50826 | f5b95be8b6e2 |
permissions | -rw-r--r-- |
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/* |
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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.hh" |
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#include "hb-font.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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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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{ |
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hb_array_t<const HBUINT16> array = points.sub_array (start_offset, point_count); |
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unsigned int count = array.length; |
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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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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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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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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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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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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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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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} |
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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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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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143 |
|
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struct CaretValueFormat3 |
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{ |
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friend struct CaretValue; |
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147 |
|
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hb_position_t get_caret_value (hb_font_t *font, hb_direction_t direction, |
149 |
const VariationStore &var_store) const |
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{ |
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return HB_DIRECTION_IS_HORIZONTAL (direction) ? |
43232 | 152 |
font->em_scale_x (coordinate) + (this+deviceTable).get_x_delta (font, var_store) : |
153 |
font->em_scale_y (coordinate) + (this+deviceTable).get_y_delta (font, var_store); |
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} |
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155 |
|
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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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161 |
|
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protected: |
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HBUINT16 caretValueFormat; /* Format identifier--format = 3 */ |
164 |
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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171 |
}; |
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172 |
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struct CaretValue |
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{ |
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hb_position_t get_caret_value (hb_font_t *font, |
43232 | 176 |
hb_direction_t direction, |
177 |
hb_codepoint_t glyph_id, |
|
178 |
const VariationStore &var_store) const |
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{ |
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switch (u.format) { |
43232 | 181 |
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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185 |
} |
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186 |
} |
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187 |
|
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bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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190 |
TRACE_SANITIZE (this); |
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191 |
if (!u.format.sanitize (c)) return_trace (false); |
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192 |
switch (u.format) { |
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193 |
case 1: return_trace (u.format1.sanitize (c)); |
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194 |
case 2: return_trace (u.format2.sanitize (c)); |
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195 |
case 3: return_trace (u.format3.sanitize (c)); |
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default:return_trace (true); |
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197 |
} |
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198 |
} |
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199 |
|
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200 |
protected: |
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201 |
union { |
50352 | 202 |
HBUINT16 format; /* Format identifier */ |
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203 |
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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208 |
DEFINE_SIZE_UNION (2, format); |
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209 |
}; |
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210 |
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struct LigGlyph |
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{ |
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unsigned int get_lig_carets (hb_font_t *font, |
214 |
hb_direction_t direction, |
|
215 |
hb_codepoint_t glyph_id, |
|
216 |
const VariationStore &var_store, |
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217 |
unsigned int start_offset, |
|
218 |
unsigned int *caret_count /* IN/OUT */, |
|
219 |
hb_position_t *caret_array /* OUT */) const |
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{ |
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if (caret_count) |
222 |
{ |
|
223 |
hb_array_t <const OffsetTo<CaretValue> > array = carets.sub_array (start_offset, caret_count); |
|
224 |
unsigned int count = array.length; |
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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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227 |
} |
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228 |
|
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229 |
return carets.len; |
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230 |
} |
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231 |
|
54232 | 232 |
bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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234 |
TRACE_SANITIZE (this); |
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235 |
return_trace (carets.sanitize (c, this)); |
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236 |
} |
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237 |
|
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238 |
protected: |
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239 |
OffsetArrayOf<CaretValue> |
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240 |
carets; /* Offset array of CaretValue tables |
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241 |
* --from beginning of LigGlyph table |
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242 |
* --in increasing coordinate order */ |
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243 |
public: |
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244 |
DEFINE_SIZE_ARRAY (2, carets); |
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245 |
}; |
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246 |
|
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247 |
struct LigCaretList |
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248 |
{ |
54232 | 249 |
unsigned int get_lig_carets (hb_font_t *font, |
250 |
hb_direction_t direction, |
|
251 |
hb_codepoint_t glyph_id, |
|
252 |
const VariationStore &var_store, |
|
253 |
unsigned int start_offset, |
|
254 |
unsigned int *caret_count /* IN/OUT */, |
|
255 |
hb_position_t *caret_array /* OUT */) const |
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256 |
{ |
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unsigned int index = (this+coverage).get_coverage (glyph_id); |
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258 |
if (index == NOT_COVERED) |
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259 |
{ |
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260 |
if (caret_count) |
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261 |
*caret_count = 0; |
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262 |
return 0; |
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263 |
} |
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264 |
const LigGlyph &lig_glyph = this+ligGlyph[index]; |
43232 | 265 |
return lig_glyph.get_lig_carets (font, direction, glyph_id, var_store, start_offset, caret_count, caret_array); |
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266 |
} |
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267 |
|
54232 | 268 |
bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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270 |
TRACE_SANITIZE (this); |
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271 |
return_trace (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this)); |
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272 |
} |
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273 |
|
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274 |
protected: |
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275 |
OffsetTo<Coverage> |
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276 |
coverage; /* Offset to Coverage table--from |
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277 |
* beginning of LigCaretList table */ |
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278 |
OffsetArrayOf<LigGlyph> |
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ligGlyph; /* Array of LigGlyph tables |
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280 |
* in Coverage Index order */ |
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281 |
public: |
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282 |
DEFINE_SIZE_ARRAY (4, ligGlyph); |
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283 |
}; |
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284 |
|
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285 |
|
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286 |
struct MarkGlyphSetsFormat1 |
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287 |
{ |
54232 | 288 |
bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const |
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289 |
{ return (this+coverage[set_index]).get_coverage (glyph_id) != NOT_COVERED; } |
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290 |
|
54232 | 291 |
bool sanitize (hb_sanitize_context_t *c) const |
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292 |
{ |
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293 |
TRACE_SANITIZE (this); |
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294 |
return_trace (coverage.sanitize (c, this)); |
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295 |
} |
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296 |
|
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297 |
protected: |
50352 | 298 |
HBUINT16 format; /* Format identifier--format = 1 */ |
48274 | 299 |
ArrayOf<LOffsetTo<Coverage> > |
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coverage; /* Array of long offsets to mark set |
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301 |
* coverage tables */ |
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302 |
public: |
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303 |
DEFINE_SIZE_ARRAY (4, coverage); |
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304 |
}; |
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305 |
|
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306 |
struct MarkGlyphSets |
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307 |
{ |
54232 | 308 |
bool covers (unsigned int set_index, hb_codepoint_t glyph_id) const |
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309 |
{ |
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310 |
switch (u.format) { |
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311 |
case 1: return u.format1.covers (set_index, glyph_id); |
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312 |
default:return false; |
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313 |
} |
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314 |
} |
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315 |
|
54232 | 316 |
bool sanitize (hb_sanitize_context_t *c) const |
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317 |
{ |
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318 |
TRACE_SANITIZE (this); |
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319 |
if (!u.format.sanitize (c)) return_trace (false); |
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320 |
switch (u.format) { |
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321 |
case 1: return_trace (u.format1.sanitize (c)); |
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322 |
default:return_trace (true); |
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323 |
} |
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324 |
} |
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325 |
|
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326 |
protected: |
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327 |
union { |
50352 | 328 |
HBUINT16 format; /* Format identifier */ |
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329 |
MarkGlyphSetsFormat1 format1; |
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330 |
} u; |
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331 |
public: |
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332 |
DEFINE_SIZE_UNION (2, format); |
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333 |
}; |
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334 |
|
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335 |
|
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336 |
/* |
50826 | 337 |
* GDEF -- Glyph Definition |
338 |
* https://docs.microsoft.com/en-us/typography/opentype/spec/gdef |
|
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339 |
*/ |
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340 |
|
54232 | 341 |
|
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342 |
struct GDEF |
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343 |
{ |
54232 | 344 |
static constexpr hb_tag_t tableTag = HB_OT_TAG_GDEF; |
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345 |
|
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346 |
enum GlyphClasses { |
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347 |
UnclassifiedGlyph = 0, |
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348 |
BaseGlyph = 1, |
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349 |
LigatureGlyph = 2, |
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350 |
MarkGlyph = 3, |
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351 |
ComponentGlyph = 4 |
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352 |
}; |
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353 |
|
54232 | 354 |
bool has_data () const { return version.to_int (); } |
355 |
bool has_glyph_classes () const { return glyphClassDef != 0; } |
|
356 |
unsigned int get_glyph_class (hb_codepoint_t glyph) const |
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357 |
{ return (this+glyphClassDef).get_class (glyph); } |
54232 | 358 |
void get_glyphs_in_class (unsigned int klass, hb_set_t *glyphs) const |
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359 |
{ (this+glyphClassDef).add_class (glyphs, klass); } |
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360 |
|
54232 | 361 |
bool has_mark_attachment_types () const { return markAttachClassDef != 0; } |
362 |
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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364 |
|
54232 | 365 |
bool has_attach_points () const { return attachList != 0; } |
366 |
unsigned int get_attach_points (hb_codepoint_t glyph_id, |
|
367 |
unsigned int start_offset, |
|
368 |
unsigned int *point_count /* IN/OUT */, |
|
369 |
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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371 |
|
54232 | 372 |
bool has_lig_carets () const { return ligCaretList != 0; } |
373 |
unsigned int get_lig_carets (hb_font_t *font, |
|
374 |
hb_direction_t direction, |
|
375 |
hb_codepoint_t glyph_id, |
|
376 |
unsigned int start_offset, |
|
377 |
unsigned int *caret_count /* IN/OUT */, |
|
378 |
hb_position_t *caret_array /* OUT */) const |
|
43232 | 379 |
{ return (this+ligCaretList).get_lig_carets (font, |
380 |
direction, glyph_id, get_var_store(), |
|
381 |
start_offset, caret_count, caret_array); } |
|
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382 |
|
54232 | 383 |
bool has_mark_sets () const { return version.to_int () >= 0x00010002u && markGlyphSetsDef != 0; } |
384 |
bool mark_set_covers (unsigned int set_index, hb_codepoint_t glyph_id) const |
|
43232 | 385 |
{ return version.to_int () >= 0x00010002u && (this+markGlyphSetsDef).covers (set_index, glyph_id); } |
386 |
||
54232 | 387 |
bool has_var_store () const { return version.to_int () >= 0x00010003u && varStore != 0; } |
388 |
const VariationStore &get_var_store () const |
|
43232 | 389 |
{ return version.to_int () >= 0x00010003u ? this+varStore : Null(VariationStore); } |
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390 |
|
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391 |
/* glyph_props is a 16-bit integer where the lower 8-bit have bits representing |
54232 | 392 |
* glyph class and other bits, and high 8-bit the mark attachment type (if any). |
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393 |
* Not to be confused with lookup_props which is very similar. */ |
54232 | 394 |
unsigned int get_glyph_props (hb_codepoint_t glyph) const |
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395 |
{ |
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396 |
unsigned int klass = get_glyph_class (glyph); |
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|
397 |
|
48274 | 398 |
static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH == (unsigned int) LookupFlag::IgnoreBaseGlyphs), ""); |
399 |
static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE == (unsigned int) LookupFlag::IgnoreLigatures), ""); |
|
400 |
static_assert (((unsigned int) HB_OT_LAYOUT_GLYPH_PROPS_MARK == (unsigned int) LookupFlag::IgnoreMarks), ""); |
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401 |
|
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402 |
switch (klass) { |
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|
403 |
default: return 0; |
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404 |
case BaseGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH; |
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405 |
case LigatureGlyph: return HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE; |
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406 |
case MarkGlyph: |
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407 |
klass = get_mark_attachment_type (glyph); |
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408 |
return HB_OT_LAYOUT_GLYPH_PROPS_MARK | (klass << 8); |
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|
409 |
} |
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|
410 |
} |
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|
411 |
|
54232 | 412 |
HB_INTERNAL bool is_blacklisted (hb_blob_t *blob, |
413 |
hb_face_t *face) const; |
|
414 |
||
415 |
struct accelerator_t |
|
416 |
{ |
|
417 |
void init (hb_face_t *face) |
|
418 |
{ |
|
419 |
this->table = hb_sanitize_context_t().reference_table<GDEF> (face); |
|
420 |
if (unlikely (this->table->is_blacklisted (this->table.get_blob (), face))) |
|
421 |
{ |
|
422 |
hb_blob_destroy (this->table.get_blob ()); |
|
423 |
this->table = hb_blob_get_empty (); |
|
424 |
} |
|
425 |
} |
|
426 |
||
427 |
void fini () { this->table.destroy (); } |
|
428 |
||
429 |
hb_blob_ptr_t<GDEF> table; |
|
430 |
}; |
|
431 |
||
432 |
unsigned int get_size () const |
|
433 |
{ |
|
434 |
return min_size + |
|
435 |
(version.to_int () >= 0x00010002u ? markGlyphSetsDef.static_size : 0) + |
|
436 |
(version.to_int () >= 0x00010003u ? varStore.static_size : 0); |
|
437 |
} |
|
438 |
||
439 |
bool subset (hb_subset_context_t *c) const |
|
440 |
{ |
|
441 |
TRACE_SUBSET (this); |
|
442 |
struct GDEF *out = c->serializer->embed (*this); |
|
443 |
if (unlikely (!out)) return_trace (false); |
|
444 |
||
445 |
out->glyphClassDef.serialize_subset (c, this+glyphClassDef, out); |
|
446 |
out->attachList.set (0);//TODO(subset) serialize_subset (c, this+attachList, out); |
|
447 |
out->ligCaretList.set (0);//TODO(subset) serialize_subset (c, this+ligCaretList, out); |
|
448 |
out->markAttachClassDef.serialize_subset (c, this+markAttachClassDef, out); |
|
449 |
||
450 |
if (version.to_int () >= 0x00010002u) |
|
451 |
out->markGlyphSetsDef.set (0);// TODO(subset) serialize_subset (c, this+markGlyphSetsDef, out); |
|
452 |
||
453 |
if (version.to_int () >= 0x00010003u) |
|
454 |
out->varStore.set (0);// TODO(subset) serialize_subset (c, this+varStore, out); |
|
455 |
||
456 |
return_trace (true); |
|
457 |
} |
|
458 |
||
459 |
bool sanitize (hb_sanitize_context_t *c) const |
|
460 |
{ |
|
461 |
TRACE_SANITIZE (this); |
|
462 |
return_trace (version.sanitize (c) && |
|
463 |
likely (version.major == 1) && |
|
464 |
glyphClassDef.sanitize (c, this) && |
|
465 |
attachList.sanitize (c, this) && |
|
466 |
ligCaretList.sanitize (c, this) && |
|
467 |
markAttachClassDef.sanitize (c, this) && |
|
468 |
(version.to_int () < 0x00010002u || markGlyphSetsDef.sanitize (c, this)) && |
|
469 |
(version.to_int () < 0x00010003u || varStore.sanitize (c, this))); |
|
470 |
} |
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471 |
|
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472 |
protected: |
40435 | 473 |
FixedVersion<>version; /* Version of the GDEF table--currently |
43232 | 474 |
* 0x00010003u */ |
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475 |
OffsetTo<ClassDef> |
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|
476 |
glyphClassDef; /* Offset to class definition table |
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|
477 |
* for glyph type--from beginning of |
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|
478 |
* GDEF header (may be Null) */ |
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|
479 |
OffsetTo<AttachList> |
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|
480 |
attachList; /* Offset to list of glyphs with |
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|
481 |
* attachment points--from beginning |
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482 |
* of GDEF header (may be Null) */ |
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483 |
OffsetTo<LigCaretList> |
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484 |
ligCaretList; /* Offset to list of positioning points |
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|
485 |
* for ligature carets--from beginning |
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|
486 |
* of GDEF header (may be Null) */ |
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487 |
OffsetTo<ClassDef> |
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488 |
markAttachClassDef; /* Offset to class definition table for |
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489 |
* mark attachment type--from beginning |
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490 |
* of GDEF header (may be Null) */ |
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491 |
OffsetTo<MarkGlyphSets> |
43232 | 492 |
markGlyphSetsDef; /* Offset to the table of mark set |
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493 |
* definitions--from beginning of GDEF |
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494 |
* header (may be NULL). Introduced |
43232 | 495 |
* in version 0x00010002. */ |
48274 | 496 |
LOffsetTo<VariationStore> |
43232 | 497 |
varStore; /* Offset to the table of Item Variation |
498 |
* Store--from beginning of GDEF |
|
499 |
* header (may be NULL). Introduced |
|
500 |
* in version 0x00010003. */ |
|
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501 |
public: |
43232 | 502 |
DEFINE_SIZE_MIN (12); |
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503 |
}; |
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504 |
|
54232 | 505 |
struct GDEF_accelerator_t : GDEF::accelerator_t {}; |
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506 |
|
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507 |
} /* namespace OT */ |
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508 |
|
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509 |
|
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510 |
#endif /* HB_OT_LAYOUT_GDEF_TABLE_HH */ |