I've been working on a bug for webkit related to an odd behavior with the
Ahem font in the Qt framework. I tracked it down to Qt either receiving
incorrect descent/ascent values from FT_Size_Metrics or using the Freetype
library incorrectly.
When using FT_Set_Char_Size(face, width, height, h_res, v_res), should
face->size->metrics have the proper values for all font types afterwards or
is it necessary for Qt to handle knowing truetype fonts use
((TT_Size)face->size)->root.metrics instead?
If face->size->metrics is supposed to have proper values after calling
FT_Set_Char_Size, then there is a bug in either ttdriver.c or ttobjs.c.
ttdriver.c line 248:
if ( FT_IS_SCALABLE( size->face ) )
error = tt_size_reset( ttsize );
will need to copy ttsize->metrics over to ttsize->root.metrics
or
ttobjs.c line 1057:
metrics = &size->metrics;
will need to be
metrics = &size->root.metrics;
are some potential fixes.
Thanks,
Steve
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