I have a few questions about this... motivated (of course) by my
interest in "GTK on Windows" performance issues. The [slightly]
bigger picture is that I am still trying to be positive about the "GTK
as a universal GUI" idea - even with the currently depressing
performance revelations... but I think making GTK look as good and be
as fast as possible *on Windows* is key to the viability of this notion.
After Neil's comment about possibly doing some caching for things like
operators and keywords, I started looking over how Scintilla uses
Pango (this is all in the gtk subdirectory).
The first thing is that [I think] Scintilla is using a fairly "heavy
weight" Pango interface for relatively "light weight" needs... IIRC,
Neil mentioned this himself quite a while ago - but I could be wrong
about this. In any case, the PangoLayout machinery being used is able
to do entire [possibly bi-directional] paragraphs, while Scintilla
only uses it for [at the most] single lines - and usually far less.
Again, I *think* Neil said that using this high-level interface was a
convenience issue [for him]. Comments or corrections?
So I have two approaches which are not mutually exclusive, and which
would both be of the good old conditional compile variety (based on
the PLAT_GTK_WIN32 symbol): the first is indeed to look at caching
oft-used glyph strings, while the second is more of a question mark -
why *not* use more of the Pango machinery for rendering and font
handling, especially since there seems to be "Win32-ized" versions of
this functionality?
Finally, I am having a conceptual/code-sleuthing problem with
Scintilla, Pango, and fonts - all I see is the very high-level
abstract font description stuff... I do not see where this is made
concrete. Put a different way, Pango has the abilities to directly
understand and use both Win32 [I assume this means TrueType] and
FreeType fonts (and something called OpenType also)... but I do not
see any of these [lower-level or more specific] calls being made.
What's the deal here? :)
Thanks for any illumination of any of this... it doesn't even look all
that hard to work on/with, but the right model is [naturally] all. ;)
Robert Roessler
[EMAIL PROTECTED]
http://www.rftp.com
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