[cairo-bugs] [Bug 23333] Mismatches hinting at certain glyph pixelsizes.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23333





--- Comment #10 from James Cloos <cloos at jhcloos.com>  2009-08-18 14:44:33 PST ---
>> Also, one last thing...shouldn't slight-hinting give you the same
>> width no matter what?  I thought slight-hinting only hinted the
>> vertical direction, never horizontal, and wouldn't need any metric
>> correction for width.

> I don't remember how slight-hinting works.  Again, we're just getting
> the metrics and outline from FreeType, and rounding the metrics if
> metrics-hinting is enabled.

Slight Hinting (aka the Light Autofit module, in freetype-speak) does
exactly as he said:  it adjusts the glyph outlines in the vertical
direction¹ only for the express purpose of not changing the horizontal
metrics.

Properly set text should accumulate the fractions even when snapping
the glyphs to pixels; it should skip extra pixels w/in whitespace, as
required, to closely match the unrounded positioning.