158 lines
4.5 KiB
C++
158 lines
4.5 KiB
C++
/*
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* Copyright © 2018 Ebrahim Byagowi
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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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#ifndef HB_AAT_LAYOUT_BSLN_TABLE_HH
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#define HB_AAT_LAYOUT_BSLN_TABLE_HH
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#include "hb-aat-layout-common.hh"
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/*
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* bsln -- Baseline
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bsln.html
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*/
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#define HB_AAT_TAG_bsln HB_TAG('b','s','l','n')
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namespace AAT {
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struct BaselineTableFormat0Part
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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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protected:
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// Roman, Ideographic centered, Ideographic low, Hanging and Math
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// are the default defined ones, but any other maybe accessed also.
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HBINT16 deltas[32]; /* These are the FUnit distance deltas from
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* the font's natural baseline to the other
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* baselines used in the font. */
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public:
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DEFINE_SIZE_STATIC (64);
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};
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struct BaselineTableFormat1Part
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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 (likely (c->check_struct (this) &&
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lookupTable.sanitize (c)));
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}
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protected:
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HBINT16 deltas[32]; /* ditto */
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Lookup<HBUINT16>
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lookupTable; /* Lookup table that maps glyphs to their
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* baseline values. */
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public:
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DEFINE_SIZE_MIN (66);
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};
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struct BaselineTableFormat2Part
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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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protected:
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HBGlyphID16 stdGlyph; /* The specific glyph index number in this
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* font that is used to set the baseline values.
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* This is the standard glyph.
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* This glyph must contain a set of control points
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* (whose numbers are contained in the ctlPoints field)
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* that are used to determine baseline distances. */
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HBUINT16 ctlPoints[32]; /* Set of control point numbers,
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* associated with the standard glyph.
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* A value of 0xFFFF means there is no corresponding
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* control point in the standard glyph. */
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public:
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DEFINE_SIZE_STATIC (66);
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};
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struct BaselineTableFormat3Part
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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 (likely (c->check_struct (this) && lookupTable.sanitize (c)));
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}
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protected:
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HBGlyphID16 stdGlyph; /* ditto */
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HBUINT16 ctlPoints[32]; /* ditto */
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Lookup<HBUINT16>
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lookupTable; /* Lookup table that maps glyphs to their
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* baseline values. */
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public:
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DEFINE_SIZE_MIN (68);
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};
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struct bsln
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{
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static constexpr hb_tag_t tableTag = HB_AAT_TAG_bsln;
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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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if (unlikely (!(c->check_struct (this) && defaultBaseline < 32)))
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return_trace (false);
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switch (format)
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{
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case 0: return_trace (parts.format0.sanitize (c));
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case 1: return_trace (parts.format1.sanitize (c));
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case 2: return_trace (parts.format2.sanitize (c));
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case 3: return_trace (parts.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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FixedVersion<>version; /* Version number of the Baseline table. */
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HBUINT16 format; /* Format of the baseline table. Only one baseline
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* format may be selected for the font. */
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HBUINT16 defaultBaseline;/* Default baseline value for all glyphs.
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* This value can be from 0 through 31. */
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union {
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// Distance-Based Formats
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BaselineTableFormat0Part format0;
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BaselineTableFormat1Part format1;
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// Control Point-based Formats
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BaselineTableFormat2Part format2;
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BaselineTableFormat3Part format3;
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} parts;
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public:
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DEFINE_SIZE_MIN (8);
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};
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} /* namespace AAT */
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#endif /* HB_AAT_LAYOUT_BSLN_TABLE_HH */
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