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[coretext] Fix positioning with trailing whitespace 

Fixes https://code.google.com/p/chromium/issues/detail?id=476913
This commit is contained in:
Behdad Esfahbod 2015-04-21 19:21:32 -07:00
parent dba482fc44
commit 24f17afeaf
1 changed files with 11 additions and 0 deletions
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11
src/hb-coretext.cc
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@ -788,6 +788,17 @@ retry:
buffer->len = 0; buffer->len = 0;
uint32_t status_and = ~0, status_or = 0; uint32_t status_and = ~0, status_or = 0;
double advances_so_far = 0; double advances_so_far = 0;
/* For right-to-left runs, CoreText returns the glyphs positioned such that
* any trailing whitespace is to the left of (0,0). Adjust coordinate system
* to fix for that. Test with any RTL string with trailing spaces.
* https://code.google.com/p/chromium/issues/detail?id=476913
*/
if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
{
advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
advances_so_far = -advances_so_far;
}
const CFRange range_all = CFRangeMake (0, 0); const CFRange range_all = CFRangeMake (0, 0);