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[coretext] Use CFRunStatus 

Assert that all runs had expected direction, and take hint for
non-monotone clusters.
This commit is contained in:
Behdad Esfahbod 2014-08-11 20:02:45 -04:00
parent fd1a6aa8d0
commit 10b1104d79
1 changed files with 15 additions and 2 deletions
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17
src/hb-coretext.cc
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@ -740,12 +740,17 @@ retry:
unsigned int num_runs = CFArrayGetCount (glyph_runs);
buffer->len = 0;
uint32_t status_and = ~0, status_or = 0;
const CFRange range_all = CFRangeMake (0, 0);
for (unsigned int i = 0; i < num_runs; i++)
{
CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
CTRunStatus run_status = CTRunGetStatus (run);
status_or |= run_status;
status_and &= run_status;
DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
/* CoreText does automatic font fallback (AKA "cascading") for characters
* not supported by the requested font, and provides no way to turn it off,
@ -863,6 +868,11 @@ retry:
}
}
/* Make sure all runs had the expected direction. */
bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
assert (bool (status_or & kCTRunStatusRightToLeft) == backward);
buffer->clear_positions ();
unsigned int count = buffer->len;
@ -878,12 +888,15 @@ retry:
/* Fix up clusters so that we never return out-of-order indices;
* if core text has reordered glyphs, we'll merge them to the
* beginning of the reordered cluster.
* beginning of the reordered cluster. CoreText is nice enough
* to tell us whenever it has produced nonmonotonic results...
* Note that we assume the input clusters were nonmonotonic to
* begin with.
*
* This does *not* mean we'll form the same clusters as Uniscribe
* or the native OT backend, only that the cluster indices will be
* monotonic in the output buffer. */
if (count > 1)
if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
{
hb_glyph_info_t *info = buffer->info;
if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))