Something is definitely causing it to change when the font is scaled though:
Scale | x_offset ~0.666 | 2141 ~0.832 | 340 ~1.000 | -1461 ~1.165 | -3262 ~1.332 | -5063 -Jamie. On 8 May 2017 at 20:45, Jamie Dale <[email protected]> wrote: > Hey all, > > I'm running HarfBuzz 1.2.4 with a modified hb_font implementation based > on the FreeType implementation in the vanilla version. > > One of the differences is that I pass through the FreeType scale as > user-data and apply it when getting the metrics from FreeType (via > FT_Set_Transform). > > We've been running with this for a while, and haven't noticed any issues > until today when we tried it with some Thai text and found that the > hb_glyph_position_t::x_offset was coming back wrong once the text was > scaled (weirdly this same issue doesn't seem to affect > hb_glyph_position_t::y_offset). > > When the scale is 1, everything is fine, but when the scale is <1 the > glyph is too far right (suggesting that the offset is too large), and when > the scale is >1 the glyph is too far left (suggesting that the offset is > too small). > > That would suggest to me that the value I'm getting back hasn't been > scaled appropriately for the actual FreeType glyph. Unfortunately I'm not > familiar enough with how HarfBuzz calculates that value to know where that > lack of scale is happening. > > I do notice that there's no FreeType override for the > set_glyph_h_origin_func from hb_font. Could that be the issue? > > The Thai text being used is ฝึ (U+0E1D, U+0E36) and the font is Tahoma > (available in Windows). > > Has anyone else attempted something like this? > > Thanks, > Jamie. >
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