159 lines
4.5 KiB
C++
159 lines
4.5 KiB
C++
/*
|
|
* 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.hh"
|
|
|
|
/*
|
|
* bsln -- Baseline
|
|
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6bsln.html
|
|
*/
|
|
#define HB_AAT_TAG_bsln HB_TAG('b','s','l','n')
|
|
|
|
|
|
namespace AAT {
|
|
|
|
|
|
struct BaselineTableFormat0Part
|
|
{
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (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
|
|
{
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (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
|
|
{
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (c->check_struct (this)));
|
|
}
|
|
|
|
protected:
|
|
HBGlyphID 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
|
|
{
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c)));
|
|
}
|
|
|
|
protected:
|
|
HBGlyphID stdGlyph; /* ditto */
|
|
HBUINT16 ctlPoints[32]; /* ditto */
|
|
Lookup<HBUINT16>
|
|
lookupTable; /* Lookup table that maps glyphs to their
|
|
* baseline values. */
|
|
public:
|
|
DEFINE_SIZE_MIN (68);
|
|
};
|
|
|
|
struct bsln
|
|
{
|
|
static constexpr hb_tag_t tableTag = HB_AAT_TAG_bsln;
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
if (unlikely (!(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 */
|