OK, I have the strangest problem. I'm drawing text with ATSUI via
ATSUDrawText, but the text is not being anti-aliased. I know this
because when I use universal access to zoom way in, it's clear there's
no aliasing. On top of that, the text just looks terrible: the tracking
and spacing of some glyphs seems to be just wrong.
Now, some things I know about this code:
- the CGContext I'm associating with the layout is the same CGContext
my HIView is telling me to draw into
- calling CGContextSetShouldAntialias(true) seems to have no effect
(even when called right before drawing)
- using kATSLineApplyAntiAliasing in the Line Layout options has no
effect
- if I rip the core code that draws out of my app and drop it into a
"simple" app the text is drawn beautifully anti-aliased
- no errors are being returned from any of the ATSUI related APIs
My logic for drawing is pretty simple:
- create unciode text from the macroman text
- create an ATSUI style based on the desired font, size, tracking,
color and h/v scale
- create an ATSUI layout for the unicode text and style, adding just
two "layout controls" (layout options and the CGContext).
- call ATSUDrawText
It's really very very straight-forward code and works perfectly in
modified Hello World sample app.
*Something* is causing ATSUI to draw in a really undesired way, but for
the life of me, I can't figure out what's causing this. It might be
some side effect elsewhere in the app, but I can't even begin to guess
where to look. I've searched for every call to
CGContextSetShouldAntialias() and it's always true. I've verified that
the same CGContext we get when told to draw our HIView is the same
CGContext used with ATSUI. We're not using QuickDraw anywhere that I
can think of. I'm at a bit of a loss here, any suggestions would be
appreciated.
Bryan
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