Faster text drawing with configurable stroke width
Faster text drawing with configurable stroke width
- Subject: Faster text drawing with configurable stroke width
- From: George Nachman <email@hidden>
- Date: Sun, 13 Mar 2011 15:03:28 -0700
Hi cocoa-dev,
I'm currently drawing text one character at a time with -[NSAttributedString
drawWithRect:options:], and it is really slow. I'm looking for a faster
alternative.
I draw one character at a time because I need exact control over horizontal
positioning (regardless of whether the font is monospaced or not, I force
characters onto a grid--this is non-negotiable) and I'm not aware of another
way to achieve this that also supports my second requirement:
I am using -[NSAttributedString drawWithRect:options:]
instead CGContextShowGlyphsWithAdvances() or CTLineDraw() because it
supports NSStrokeWidthAttributeName. It also does a nice (but not as nice a
NSTextView) job at rendering combining marks.
My performance troubles are significant when there is a substantial amount
of new text, so caching layouts would do me little good. I suspect there
might be something lurking in NSLayoutManager/NSTypesetter/etc. that can
help me, but I haven't found it.
Thanks for your help,
George
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