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Diffstat (limited to 'src/hb-aat-layout-bsln-table.hh')
| -rw-r--r-- | src/hb-aat-layout-bsln-table.hh | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/hb-aat-layout-bsln-table.hh b/src/hb-aat-layout-bsln-table.hh new file mode 100644 index 00000000..3b9e4fea --- /dev/null +++ b/src/hb-aat-layout-bsln-table.hh @@ -0,0 +1,156 @@ +/* + * Copyright © 2018 Ebrahim Byagowi + * + * 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. + */ + +#ifndef HB_AAT_LAYOUT_BSLN_TABLE_HH +#define HB_AAT_LAYOUT_BSLN_TABLE_HH + +#include "hb-aat-layout-common-private.hh" + +#define HB_AAT_TAG_bsln HB_TAG('b','s','l','n') + + +namespace AAT { + +struct BaselineTableFormat0Part +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + // Roman, Ideographic centered, Ideographic low, Hanging and Math + // are the default defined ones, but any other maybe accessed also. + HBINT16 deltas[32]; /* These are the FUnit distance deltas from + * the font's natural baseline to the other + * baselines used in the font. */ + public: + DEFINE_SIZE_STATIC (64); +}; + +struct BaselineTableFormat1Part +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && lookupTable.sanitize (c)); + } + + protected: + HBINT16 deltas[32]; /* ditto */ + Lookup<HBUINT16> + lookupTable; /* Lookup table that maps glyphs to their + * baseline values. */ + public: + DEFINE_SIZE_MIN (66); +}; + +struct BaselineTableFormat2Part +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + GlyphID stdGlyph; /* The specific glyph index number in this + * font that is used to set the baseline values. + * This is the standard glyph. + * This glyph must contain a set of control points + * (whose numbers are contained in the ctlPoints field) + * that are used to determine baseline distances. */ + HBUINT16 ctlPoints[32]; /* Set of control point numbers, + * associated with the standard glyph. + * A value of 0xFFFF means there is no corresponding + * control point in the standard glyph. */ + public: + DEFINE_SIZE_STATIC (66); +}; + +struct BaselineTableFormat3Part +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && lookupTable.sanitize (c)); + } + + protected: + GlyphID stdGlyph; /* ditto */ + HBUINT16 ctlPoints[32]; /* ditto */ + Lookup<HBUINT16> + lookupTable; /* Lookup table that maps glyphs to their + * baseline values. */ + public: + DEFINE_SIZE_MIN (68); +}; + +/* + * bsln -- Baseline table + * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bsln.html + */ + +struct bsln +{ + static const hb_tag_t tableTag = HB_AAT_TAG_bsln; + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (!(c->check_struct (this) && defaultBaseline < 32)) + return_trace (false); + + switch (format) { + case 0: return_trace (parts.format0.sanitize (c)); + case 1: return_trace (parts.format1.sanitize (c)); + case 2: return_trace (parts.format2.sanitize (c)); + case 3: return_trace (parts.format3.sanitize (c)); + default:return_trace (true); + } + } + + protected: + FixedVersion<>version; /* Version number of the Baseline table. */ + HBUINT16 format; /* Format of the baseline table. Only one baseline + * format may be selected for the font. */ + HBUINT16 defaultBaseline;/* Default baseline value for all glyphs. + * This value can be from 0 through 31. */ + union { + // Distance-Based Formats + BaselineTableFormat0Part format0; + BaselineTableFormat1Part format1; + // Control Point-based Formats + BaselineTableFormat2Part format2; + BaselineTableFormat3Part format3; + } parts; + public: + DEFINE_SIZE_MIN (8); +}; + +} /* namespace AAT */ + + +#endif /* HB_AAT_LAYOUT_BSLN_TABLE_HH */ |