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[aat] Port RearrangementSubtable to StateTableDriver

This commit is contained in:
Behdad Esfahbod 2018-01-12 00:08:22 +01:00
parent 117cfe7bb7
commit c70d58f97d
1 changed files with 45 additions and 48 deletions
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93
src/hb-aat-layout-morx-table.hh
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@ -40,57 +40,40 @@ using namespace OT;
struct RearrangementSubtable
{
enum Flags {
MarkFirst = 0x8000, /* If set, make the current glyph the first
* glyph to be rearranged. */
DontAdvance = 0x4000, /* If set, don't advance to the next glyph
* before going to the new state. This means
* that the glyph index doesn't change, even
* if the glyph at that index has changed. */
MarkLast = 0x2000, /* If set, make the current glyph the last
* glyph to be rearranged. */
Reserved = 0x1FF0, /* These bits are reserved and should be set to 0. */
Verb = 0x000F, /* The type of rearrangement specified. */
};
inline bool apply (hb_apply_context_t *c) const
struct driver_context_t
{
TRACE_APPLY (this);
enum Flags {
MarkFirst = 0x8000, /* If set, make the current glyph the first
* glyph to be rearranged. */
DontAdvance = 0x4000, /* If set, don't advance to the next glyph
* before going to the new state. This means
* that the glyph index doesn't change, even
* if the glyph at that index has changed. */
MarkLast = 0x2000, /* If set, make the current glyph the last
* glyph to be rearranged. */
Reserved = 0x1FF0, /* These bits are reserved and should be set to 0. */
Verb = 0x000F, /* The type of rearrangement specified. */
};
bool ret = false;
unsigned int num_glyphs = c->face->get_num_glyphs ();
inline driver_context_t (const RearrangementSubtable *table) :
ret (false),
start (0), end (0),
last_zero_before_start (0) {}
unsigned int state = 0;
unsigned int last_zero = 0;
unsigned int last_zero_before_start = 0;
unsigned int start = 0;
unsigned int end = 0;
hb_glyph_info_t *info = c->buffer->info;
unsigned int count = c->buffer->len;
for (unsigned int i = 0; i <= count; i++)
inline void transition (StateTableDriver<void> *driver,
const Entry<void> *entry)
{
if (!state)
last_zero = i;
unsigned int klass = i < count ?
machine.get_class (info[i].codepoint, num_glyphs) :
0 /* End of text */;
const Entry<void> *entry = machine.get_entryZ (state, klass);
if (unlikely (!entry))
break;
hb_buffer_t *buffer = driver->buffer;
unsigned int flags = entry->flags;
if (flags & MarkFirst)
{
start = i;
last_zero_before_start = last_zero;
start = buffer->idx;
last_zero_before_start = driver->last_zero;
}
if (flags & MarkLast)
end = MIN (i + 1, count);
end = MIN (buffer->idx + 1, buffer->len);
if ((flags & Verb) && start < end)
{
@ -126,10 +109,12 @@ struct RearrangementSubtable
if (end - start >= l + r)
{
c->buffer->unsafe_to_break (last_zero_before_start, MIN (i + 1, count));
c->buffer->merge_clusters (start, end);
buffer->unsafe_to_break (last_zero_before_start, MIN (buffer->idx + 1, buffer->len));
buffer->merge_clusters (start, end);
hb_glyph_info_t *info = buffer->info;
hb_glyph_info_t buf[4];
memcpy (buf, info + start, l * sizeof (buf[0]));
memcpy (buf + 2, info + end - r, r * sizeof (buf[0]));
@ -152,14 +137,26 @@ struct RearrangementSubtable
}
}
}
if (flags & DontAdvance)
i--; /* TODO Detect infinite loop. */
state = entry->newState;
}
return_trace (ret);
public:
bool ret;
private:
unsigned int start = 0;
unsigned int end = 0;
unsigned int last_zero_before_start = 0;
};
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY (this);
driver_context_t dc (this);
StateTableDriver<void> driver (machine, c->buffer, c->face);
driver.drive (&dc);
return_trace (dc.ret);
}
inline bool sanitize (hb_sanitize_context_t *c) const