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[kerx] Towards sharing Format1

This commit is contained in:
Behdad Esfahbod 2018-11-07 11:02:04 -05:00
parent e890753ebb
commit ce3451dc2a
1 changed files with 47 additions and 14 deletions
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61
src/hb-aat-layout-kerx-table.hh
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@ -156,9 +156,22 @@ struct KerxSubTableFormat0
DEFINE_SIZE_ARRAY (KernSubTableHeader::static_size + 16, pairs);
};
template <typename KernSubTableHeader>
struct KerxSubTableFormat1
template <bool extended>
struct Format1Entry;
template <>
struct Format1Entry<true>
{
enum Flags
{
Push = 0x8000, /* If set, push this glyph on the kerning stack. */
DontAdvance = 0x4000, /* If set, don't advance to the next glyph
* before going to the new state. */
Reset = 0x2000, /* If set, reset the kerning data (clear the stack) */
Reserved = 0x1FFF, /* Not used; set to 0. */
};
struct EntryData
{
HBUINT16 kernActionIndex;/* Index into the kerning value array. If
@ -167,17 +180,39 @@ struct KerxSubTableFormat1
public:
DEFINE_SIZE_STATIC (2);
};
};
template <>
struct Format1Entry<false>
{
enum Flags
{
Push = 0x8000, /* If set, push this glyph on the kerning stack. */
DontAdvance = 0x4000, /* If set, don't advance to the next glyph
* before going to the new state. */
Offset = 0x3FFF, /* Byte offset from beginning of subtable to the
* value table for the glyphs on the kerning stack. */
Reset = 0x0000, /* Not supported? */
};
typedef void EntryData;
};
template <typename KernSubTableHeader>
struct KerxSubTableFormat1
{
typedef typename KernSubTableHeader::Types Types;
typedef typename Types::HBUINT HBUINT;
typedef Format1Entry<Types::extended> Format1EntryT;
typedef typename Format1EntryT::EntryData EntryData;
struct driver_context_t
{
static const bool in_place = true;
enum Flags
enum
{
Push = 0x8000, /* If set, push this glyph on the kerning stack. */
DontAdvance = 0x4000, /* If set, don't advance to the next glyph
* before going to the new state. */
Reset = 0x2000, /* If set, reset the kerning data (clear the stack) */
Reserved = 0x1FFF, /* Not used; set to 0. */
DontAdvance = Format1EntryT::DontAdvance,
};
inline driver_context_t (const KerxSubTableFormat1 *table,
@ -202,12 +237,10 @@ struct KerxSubTableFormat1
hb_buffer_t *buffer = driver->buffer;
unsigned int flags = entry->flags;
if (flags & Reset)
{
if (flags & Format1EntryT::Reset)
depth = 0;
}
if (flags & Push)
if (flags & Format1EntryT::Push)
{
if (likely (depth < ARRAY_LENGTH (stack)))
stack[depth++] = buffer->idx;
@ -339,8 +372,8 @@ struct KerxSubTableFormat1
protected:
KernSubTableHeader header;
StateTable<MorxTypes, EntryData> machine;
LOffsetTo<UnsizedArrayOf<FWORD>, false> kernAction;
StateTable<Types, EntryData> machine;
OffsetTo<UnsizedArrayOf<FWORD>, HBUINT, false>kernAction;
public:
DEFINE_SIZE_STATIC (KernSubTableHeader::static_size + 20);
};