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[subset] COLRv1: add ClipList/ClipRecord/ClipBox struct definition

This commit is contained in:
Qunxin Liu 2021-09-30 10:42:17 -07:00 committed by Behdad Esfahbod
parent 2e5636eeaf
commit e51c7f8e79
1 changed files with 76 additions and 0 deletions
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76
src/hb-ot-color-colr-table.hh
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@ -872,6 +872,79 @@ struct PaintComposite
DEFINE_SIZE_STATIC (8);
};
struct ClipBoxTemplate
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
public:
HBUINT8 format; /* format = 1(noVar) or 2(Var)*/
FWORD xMin;
FWORD yMin;
FWORD xMax;
FWORD yMax;
public:
DEFINE_SIZE_STATIC (1 + 4 * FWORD::static_size);
};
struct ClipBoxFormat1 : ClipBoxTemplate {};
struct ClipBoxFormat2 : Variable<ClipBoxTemplate> {};
struct ClipBox
{
template <typename context_t, typename ...Ts>
typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
{
TRACE_DISPATCH (this, u.format);
if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
switch (u.format) {
case 1: return_trace (c->dispatch (u.format1, hb_forward<Ts> (ds)...));
case 2: return_trace (c->dispatch (u.format2, hb_forward<Ts> (ds)...));
default:return_trace (c->default_return_value ());
}
}
protected:
union {
HBUINT16 format; /* Format identifier */
ClipBoxFormat1 format1;
ClipBoxFormat2 format2;
} u;
};
struct ClipRecord
{
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && clipBox.sanitize (c, base));
}
public:
HBUINT16 startGlyphID; // first gid clip applies to
HBUINT16 endGlyphID; // last gid clip applies to, inclusive
Offset24To<ClipBox> clipBox; // Box or VarBox
public:
DEFINE_SIZE_STATIC (7);
};
struct ClipList
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && clips.sanitize (c, this));
}
HBUINT8 format; // Set to 1.
Array32Of<ClipRecord> clips; // Clip records, sorted by startGlyphID
public:
DEFINE_SIZE_ARRAY_SIZED (5, clips);
};
struct Paint
{
template <typename context_t, typename ...Ts>
@ -1244,6 +1317,8 @@ struct COLR
(COLRV1_ENABLE_SUBSETTING && version == 1 &&
baseGlyphList.sanitize (c, this) &&
layerList.sanitize (c, this) &&
clipList.sanitize (c, this) &&
varIdxMap.sanitize (c, this) &&
varStore.sanitize (c, this))));
}
@ -1397,6 +1472,7 @@ struct COLR
// Version-1 additions
Offset32To<BaseGlyphList> baseGlyphList;
Offset32To<LayerList> layerList;
Offset32To<ClipList> clipList; // Offset to ClipList table (may be NULL)
Offset32To<DeltasetIndexMap> varIdxMap; // Offset to DeltasetIndexMap table (may be NULL)
Offset32To<VariationStore> varStore;
public: