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[subset] add DeltasetIndexMap struct definition

This commit is contained in:
Qunxin Liu 2021-08-04 14:51:52 -07:00 committed by Behdad Esfahbod
parent d2e986fead
commit 2e5636eeaf
1 changed files with 84 additions and 2 deletions
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86
src/hb-ot-color-colr-table.hh
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@ -1043,6 +1043,87 @@ struct LayerList : Array32OfOffset32To<Paint>
}
};
struct DeltasetIndexMapFormat0
{
friend struct DeltasetIndexMap;
private:
unsigned int get_width () const
{ return ((entryFormat >> 4) & 3) + 1; }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
c->check_range (mapDataZ.arrayZ,
mapCount,
get_width ()));
}
protected:
HBUINT8 format; /* Format identifier--format = 0 */
HBUINT8 entryFormat; /* A packed field that describes the compressed
* representation of delta-set indices. */
HBUINT16 mapCount; /* The number of mapping entries. */
UnsizedArrayOf<HBUINT8>
mapDataZ; /* The delta-set index mapping data. */
public:
DEFINE_SIZE_ARRAY (4, mapDataZ);
};
struct DeltasetIndexMapFormat1
{
friend struct DeltasetIndexMap;
private:
unsigned int get_width () const
{ return ((entryFormat >> 4) & 3) + 1; }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
c->check_range (mapDataZ.arrayZ,
mapCount,
get_width ()));
}
protected:
HBUINT8 format; /* Format identifier--format = 1 */
HBUINT8 entryFormat; /* A packed field that describes the compressed
* representation of delta-set indices. */
HBUINT32 mapCount; /* The number of mapping entries. */
UnsizedArrayOf<HBUINT8>
mapDataZ; /* The delta-set index mapping data. */
public:
DEFINE_SIZE_ARRAY (6, mapDataZ);
};
struct DeltasetIndexMap
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 0: return_trace (u.format0.sanitize (c));
case 1: return_trace (u.format1.sanitize (c));
default:return_trace (true);
}
}
protected:
union {
HBUINT8 format; /* Format identifier */
DeltasetIndexMapFormat0 format0;
DeltasetIndexMapFormat1 format1;
} u;
public:
DEFINE_SIZE_UNION (1, format);
};
struct COLR
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_COLR;
@ -1287,7 +1368,7 @@ struct COLR
if (version == 0) return_trace (ret);
auto snap = c->serializer->snapshot ();
if (!c->serializer->allocate_size<void> (3 * HBUINT32::static_size)) return_trace (false);
if (!c->serializer->allocate_size<void> (4 * HBUINT32::static_size)) return_trace (false);
if (!colr_prime->baseGlyphList.serialize_subset (c, baseGlyphList, this))
{
if (c->serializer->in_error ()) return_trace (false);
@ -1299,6 +1380,7 @@ struct COLR
if (!colr_prime->layerList.serialize_subset (c, layerList, this)) return_trace (false);
colr_prime->varIdxMap = 0;
colr_prime->varStore = 0;
//TODO: subset varStore once it's implemented in fonttools
return_trace (true);
@ -1315,7 +1397,7 @@ struct COLR
// Version-1 additions
Offset32To<BaseGlyphList> baseGlyphList;
Offset32To<LayerList> layerList;
//Offset32<DeltaSetIndexMap> varIdxMap; // Offset to DeltaSetIndexMap table (may be NULL)
Offset32To<DeltasetIndexMap> varIdxMap; // Offset to DeltasetIndexMap table (may be NULL)
Offset32To<VariationStore> varStore;
public:
DEFINE_SIZE_MIN (14);