On Sat, Feb 14, 2009 at 9:58 PM, Aki Inoue <a...@apple.com> wrote:
The Text System encapsulates the logic to determine the ideal
layout. It's
not just queried from a font instance. It requires the context of
an entire
line.
What if the line is rendered with a single font? Which font attributes
are involved, exactly? Suppose I have a font and I know the content of
the line as a sequence of code points. Surely there are some font
attributes that the Cocoa text system queries that I can also query
myself?
The most simple logic for getting the default line height can be
accessible via -[NSLayoutManager defaultLineHeightForFont:].
AppKit puts descent + leading below the baseline, so you should be
able to calculate the line spacing delta on top of ascent.
NSATSTypesetter taps into the power of CoreText and still provides
additional abstraction and functionalities (attachment, all the
NSParagraphStyle attributes, etc).
Thanks, I'll take a look. Does NSATSTypesetter work on 64-bit systems?
The documentation mentions it uses ATSUI, and I thought this did not
exist in the 64-bit libraries.
Ah, the documentation didn't get updated to reflect the reality.
Despite of the naming, it's been using CoreText since Tiger.
Aki
Slava
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