Comparion of LogicalFontInstance::ImplGetGlyphBoundRect() between platforms
caolanm at redhat.com
Sat Oct 22 18:20:44 UTC 2022
On Sat, 2022-10-22 at 01:42 +1100, Chris Sherlock wrote:
> > Test name: VclLogicalFontInstanceTest::testglyphboundrect
> > equality assertion failed
> > - Expected: 51x82@(7,-80)
> > - Actual : 51x83@(7,-80)
> I’ve had another look at the code, with some help from Khaled. The
> issue is the way in which we do our final rounding.
> On Freetype, it uses 26.6 fixed point, and thus needs it’s own
> special FreeType ceil and floor functions. CoreText appears to using
> floating point, but the std::ceil and std::floor functions give
> slight different results.
I presume that for mac its CoreTextStyle::ImplGetGlyphoundRect and the
CTFontGetBoundingRectsForGlyphs so could print the numbers we get there
vs the ones we get in FreeTypeFont::GetGlyphBoundRect to verify that.
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