213 lines
6.7 KiB
C++
213 lines
6.7 KiB
C++
/*
|
|
* Copyright © 2017 Google, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* Google Author(s): Behdad Esfahbod
|
|
*/
|
|
|
|
#ifndef HB_OT_VAR_FVAR_TABLE_HH
|
|
#define HB_OT_VAR_FVAR_TABLE_HH
|
|
|
|
#include "hb-open-type-private.hh"
|
|
|
|
/*
|
|
* fvar -- Font Variations
|
|
* https://docs.microsoft.com/en-us/typography/opentype/spec/fvar
|
|
*/
|
|
|
|
#define HB_OT_TAG_fvar HB_TAG('f','v','a','r')
|
|
|
|
|
|
namespace OT {
|
|
|
|
|
|
struct InstanceRecord
|
|
{
|
|
inline bool sanitize (hb_sanitize_context_t *c, unsigned int axis_count) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (c->check_struct (this) &&
|
|
c->check_array (coordinates, coordinates[0].static_size, axis_count));
|
|
}
|
|
|
|
protected:
|
|
NameID subfamilyNameID;/* The name ID for entries in the 'name' table
|
|
* that provide subfamily names for this instance. */
|
|
HBUINT16 reserved; /* Reserved for future use — set to 0. */
|
|
Fixed coordinates[VAR];/* The coordinates array for this instance. */
|
|
//NameID postScriptNameIDX;/*Optional. The name ID for entries in the 'name'
|
|
// * table that provide PostScript names for this
|
|
// * instance. */
|
|
|
|
public:
|
|
DEFINE_SIZE_ARRAY (4, coordinates);
|
|
};
|
|
|
|
struct AxisRecord
|
|
{
|
|
inline bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (c->check_struct (this));
|
|
}
|
|
|
|
public:
|
|
Tag axisTag; /* Tag identifying the design variation for the axis. */
|
|
Fixed minValue; /* The minimum coordinate value for the axis. */
|
|
Fixed defaultValue; /* The default coordinate value for the axis. */
|
|
Fixed maxValue; /* The maximum coordinate value for the axis. */
|
|
HBUINT16 reserved; /* Reserved for future use — set to 0. */
|
|
NameID axisNameID; /* The name ID for entries in the 'name' table that
|
|
* provide a display name for this axis. */
|
|
|
|
public:
|
|
DEFINE_SIZE_STATIC (20);
|
|
};
|
|
|
|
struct fvar
|
|
{
|
|
static const hb_tag_t tableTag = HB_OT_TAG_fvar;
|
|
|
|
inline bool has_data (void) const { return version.to_int () != 0; }
|
|
|
|
inline bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (version.sanitize (c) &&
|
|
likely (version.major == 1) &&
|
|
c->check_struct (this) &&
|
|
instanceSize >= axisCount * 4 + 4 &&
|
|
axisSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */
|
|
instanceSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */
|
|
c->check_range (this, things) &&
|
|
c->check_range (&StructAtOffset<char> (this, things),
|
|
axisCount * axisSize + instanceCount * instanceSize));
|
|
}
|
|
|
|
inline unsigned int get_axis_count (void) const
|
|
{ return axisCount; }
|
|
|
|
inline bool get_axis (unsigned int index, hb_ot_var_axis_t *info) const
|
|
{
|
|
if (unlikely (index >= axisCount))
|
|
return false;
|
|
|
|
if (info)
|
|
{
|
|
const AxisRecord &axis = get_axes ()[index];
|
|
info->tag = axis.axisTag;
|
|
info->name_id = axis.axisNameID;
|
|
info->default_value = axis.defaultValue / 65536.;
|
|
/* Ensure order, to simplify client math. */
|
|
info->min_value = MIN<float> (info->default_value, axis.minValue / 65536.);
|
|
info->max_value = MAX<float> (info->default_value, axis.maxValue / 65536.);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
inline unsigned int get_axis_infos (unsigned int start_offset,
|
|
unsigned int *axes_count /* IN/OUT */,
|
|
hb_ot_var_axis_t *axes_array /* OUT */) const
|
|
{
|
|
if (axes_count)
|
|
{
|
|
unsigned int count = axisCount;
|
|
start_offset = MIN (start_offset, count);
|
|
|
|
count -= start_offset;
|
|
axes_array += start_offset;
|
|
|
|
count = MIN (count, *axes_count);
|
|
*axes_count = count;
|
|
|
|
for (unsigned int i = 0; i < count; i++)
|
|
get_axis (start_offset + i, axes_array + i);
|
|
}
|
|
return axisCount;
|
|
}
|
|
|
|
inline bool find_axis (hb_tag_t tag, unsigned int *index, hb_ot_var_axis_t *info) const
|
|
{
|
|
const AxisRecord *axes = get_axes ();
|
|
unsigned int count = get_axis_count ();
|
|
for (unsigned int i = 0; i < count; i++)
|
|
if (axes[i].axisTag == tag)
|
|
{
|
|
if (index)
|
|
*index = i;
|
|
return get_axis (i, info);
|
|
}
|
|
if (index)
|
|
*index = HB_OT_VAR_NO_AXIS_INDEX;
|
|
return false;
|
|
}
|
|
|
|
inline int normalize_axis_value (unsigned int axis_index, float v) const
|
|
{
|
|
hb_ot_var_axis_t axis;
|
|
if (!get_axis (axis_index, &axis))
|
|
return 0;
|
|
|
|
v = MAX (MIN (v, axis.max_value), axis.min_value); /* Clamp. */
|
|
|
|
if (v == axis.default_value)
|
|
return 0;
|
|
else if (v < axis.default_value)
|
|
v = (v - axis.default_value) / (axis.default_value - axis.min_value);
|
|
else
|
|
v = (v - axis.default_value) / (axis.max_value - axis.default_value);
|
|
return (int) (v * 16384. + (v >= 0. ? .5 : -.5));
|
|
}
|
|
|
|
protected:
|
|
inline const AxisRecord * get_axes (void) const
|
|
{ return &StructAtOffset<AxisRecord> (this, things); }
|
|
|
|
inline const InstanceRecord * get_instances (void) const
|
|
{ return &StructAtOffset<InstanceRecord> (get_axes () + axisCount, 0); }
|
|
|
|
protected:
|
|
FixedVersion<>version; /* Version of the fvar table
|
|
* initially set to 0x00010000u */
|
|
Offset16 things; /* Offset in bytes from the beginning of the table
|
|
* to the start of the AxisRecord array. */
|
|
HBUINT16 reserved; /* This field is permanently reserved. Set to 2. */
|
|
HBUINT16 axisCount; /* The number of variation axes in the font (the
|
|
* number of records in the axes array). */
|
|
HBUINT16 axisSize; /* The size in bytes of each VariationAxisRecord —
|
|
* set to 20 (0x0014) for this version. */
|
|
HBUINT16 instanceCount; /* The number of named instances defined in the font
|
|
* (the number of records in the instances array). */
|
|
HBUINT16 instanceSize; /* The size in bytes of each InstanceRecord — set
|
|
* to either axisCount * sizeof(Fixed) + 4, or to
|
|
* axisCount * sizeof(Fixed) + 6. */
|
|
|
|
public:
|
|
DEFINE_SIZE_STATIC (16);
|
|
};
|
|
|
|
} /* namespace OT */
|
|
|
|
|
|
#endif /* HB_OT_VAR_FVAR_TABLE_HH */
|