[morx] Implement horiz-only/vert-only subtables
diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index 03f3102..03bb4d5 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -743,8 +743,25 @@
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 @@
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;
