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[morx] Implement horiz-only/vert-only subtables

This commit is contained in:
Behdad Esfahbod 2018-09-19 16:24:34 -04:00
parent 041a08de3d
commit 3bccd62196
1 changed files with 23 additions and 1 deletions
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24
src/hb-aat-layout-morx-table.hh
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@ -743,8 +743,25 @@ struct ChainSubtable
friend struct Chain;
inline unsigned int get_size (void) const { return length; }
inline unsigned int get_type (void) const { return coverage & 0xFF; }
inline unsigned int get_type (void) const { return coverage & SubtableType; }
enum Coverage
{
Vertical = 0x80000000, /* If set, this subtable will only be applied
* to vertical text. If clear, this subtable
* will only be applied to horizontal text. */
Descending = 0x40000000, /* If set, this subtable will process glyphs
* in descending order. If clear, it will
* process the glyphs in ascending order. */
AllDirections = 0x20000000, /* If set, this subtable will be applied to
* both horizontal and vertical text (i.e.
* the state of bit 0x80000000 is ignored). */
Logical = 0x10000000, /* If set, this subtable will process glyphs
* in logical order (or reverse logical order,
* depending on the value of bit 0x80000000). */
Reserved = 0x0FFFFF00, /* Reserved, set to zero. */
SubtableType = 0x000000FF, /* Subtable type; see following table. */
};
enum Type
{
Rearrangement = 0,
@ -822,6 +839,11 @@ struct Chain
if (!(subtable->subFeatureFlags & flags))
goto skip;
if (!(subtable->coverage & ChainSubtable::AllDirections) &&
HB_DIRECTION_IS_VERTICAL (c->buffer->props.direction) !=
bool (subtable->coverage & ChainSubtable::Vertical))
goto skip;
if (!c->buffer->message (c->font, "start chain subtable %d", c->lookup_index))
goto skip;