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[>64k:layout:PairPos] Templatize & implement format 4 

Implements part of https://github.com/be-fonts/boring-expansion-spec/issues/38

Subset does NOT lower format.
This commit is contained in:
Behdad Esfahbod 2022-07-07 13:55:26 -06:00
parent ecd8bc5a9c
commit e9f8010fd0
2 changed files with 15 additions and 8 deletions
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8
src/OT/Layout/GPOS/PairPos.hh
View File

@ -14,7 +14,10 @@ struct PairPos
union {
HBUINT16 format; /* Format identifier */
PairPosFormat1 format1;
PairPosFormat2 format2;
PairPosFormat2_4<SmallTypes> format2;
#ifndef HB_NO_BORING_EXPANSION
PairPosFormat2_4<MediumTypes> format4;
#endif
} u;
public:
@ -26,6 +29,9 @@ struct PairPos
switch (u.format) {
case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
case 2: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
#ifndef HB_NO_BORING_EXPANSION
case 4: return_trace (c->dispatch (u.format2, std::forward<Ts> (ds)...));
#endif
default:return_trace (c->default_return_value ());
}
}

11
src/OT/Layout/GPOS/PairPosFormat2.hh
View File

@ -7,11 +7,12 @@ namespace OT {
namespace Layout {
namespace GPOS_impl {
struct PairPosFormat2
template <typename Types>
struct PairPosFormat2_4
{
protected:
HBUINT16 format; /* Format identifier--format = 2 */
Offset16To<Coverage>
typename Types::template OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat1; /* ValueRecord definition--for the
@ -20,11 +21,11 @@ struct PairPosFormat2
ValueFormat valueFormat2; /* ValueRecord definition--for the
* second glyph of the pair--may be
* zero (0) */
Offset16To<ClassDef>
typename Types::template OffsetTo<ClassDef>
classDef1; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the first glyph of the pair */
Offset16To<ClassDef>
typename Types::template OffsetTo<ClassDef>
classDef2; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the second glyph of the pair */
@ -36,7 +37,7 @@ struct PairPosFormat2
* class1-major, class2-minor,
* Each entry has value1 and value2 */
public:
DEFINE_SIZE_ARRAY (16, values);
DEFINE_SIZE_ARRAY (10 + 3 * Types::size, values);
bool sanitize (hb_sanitize_context_t *c) const
{