walkero
/
harfbuzz
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[trak] Clean up

This commit is contained in:
Behdad Esfahbod 2018-10-11 10:18:46 -04:00
parent fbbd926dba
commit 071a2cbcdd
1 changed files with 38 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
src/hb-aat-layout-trak-table.hh
View File

@ -46,28 +46,32 @@ struct TrackTableEntry
{
friend struct TrackData;
inline bool sanitize (hb_sanitize_context_t *c, const void *base,
unsigned int size) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
(valuesZ.sanitize (c, base, size))));
}
private:
inline float get_track_value () const
{
return track.to_float ();
}
inline int get_value (const void *base, unsigned int index) const
inline int get_value (const void *base,
unsigned int index,
unsigned int nSizes) const
{
return (base+valuesZ)[index];
return hb_array_t<FWORD> ((base+valuesZ).arrayZ, nSizes)[index];
}
public:
inline bool sanitize (hb_sanitize_context_t *c, const void *base,
unsigned int nSizes) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
(valuesZ.sanitize (c, base, nSizes))));
}
protected:
Fixed track; /* Track value for this record. */
NameID trackNameID; /* The 'name' table index for this track */
NameID trackNameID; /* The 'name' table index for this track.
* (a short word or phrase like "loose"
* or "very tight") */
OffsetTo<UnsizedArrayOf<FWORD>, HBUINT16, false>
valuesZ; /* Offset from start of tracking table to
* per-size tracking values for this track. */
@ -78,14 +82,6 @@ struct TrackTableEntry
struct TrackData
{
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
sizeTable.sanitize (c, base, nSizes) &&
trackTable.sanitize (c, nTracks, base, nSizes));
}
inline float get_tracking (const void *base, float ptem) const
{
/* CoreText points are CSS pixels (96 per inch),
@ -120,22 +116,31 @@ struct TrackData
// TODO(ebraminio): We don't attempt to extrapolate to larger or
// smaller values for now but we should do, per spec
if (size_index == sizes)
return trackTableEntry->get_value (base, sizes - 1);
return trackTableEntry->get_value (base, sizes - 1, nSizes);
if (size_index == 0 || size_table[size_index] == fixed_size)
return trackTableEntry->get_value (base, size_index);
return trackTableEntry->get_value (base, size_index, nSizes);
float s0 = size_table[size_index - 1].to_float ();
float s1 = size_table[size_index].to_float ();
float t = (csspx - s0) / (s1 - s0);
return (float) t * trackTableEntry->get_value (base, size_index) +
((float) 1.0 - t) * trackTableEntry->get_value (base, size_index - 1);
return (float) t * trackTableEntry->get_value (base, size_index, nSizes) +
((float) 1.0 - t) * trackTableEntry->get_value (base, size_index - 1, nSizes);
}
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
sizeTable.sanitize (c, base, nSizes) &&
trackTable.sanitize (c, nTracks, base, nSizes));
}
protected:
HBUINT16 nTracks; /* Number of separate tracks included in this table. */
HBUINT16 nSizes; /* Number of point sizes included in this table. */
LOffsetTo<UnsizedArrayOf<Fixed>, false>
sizeTable; /* Offset to array[nSizes] of size values. */
sizeTable; /* Offset from start of the tracking table to
* Array[nSizes] of size values.. */
UnsizedArrayOf<TrackTableEntry>
trackTable; /* Array[nTracks] of TrackTableEntry records. */
@ -194,15 +199,17 @@ struct trak
}
protected:
FixedVersion<> version; /* Version of the tracking table--currently
* 0x00010000u for version 1.0. */
HBUINT16 format; /* Format of the tracking table */
OffsetTo<TrackData> horizData; /* TrackData for horizontal text */
OffsetTo<TrackData> vertData; /* TrackData for vertical text */
FixedVersion<> version; /* Version of the tracking table
* (0x00010000u for version 1.0). */
HBUINT16 format; /* Format of the tracking table (set to 0). */
OffsetTo<TrackData> horizData; /* Offset from start of tracking table to TrackData
* for horizontal text (or 0 if none). */
OffsetTo<TrackData> vertData; /* Offset from start of tracking table to TrackData
* for vertical text (or 0 if none). */
HBUINT16 reserved; /* Reserved. Set to 0. */
public:
DEFINE_SIZE_MIN (12);
DEFINE_SIZE_STATIC (12);
};
} /* namespace AAT */