nanogui: GrText is so slow?
Subject:
Re: [nanogui] GrText is so slow?
From:
Jordan Crouse ####@####.####
Date:
4 Dec 2001 17:52:21 -0000
Message-Id: <E16BJjb-000185-00@ns.censoft.com>
Your problem here is the Truetype. You need to render each glyph
individually, which unfortunately takes time, especially if your glyphs are
complicated. This is different than the compiled in fonts, which have pre
generated bitmaps. Not as pretty, but certainly much faster.
We do have caching code (but I'm not sure if it is being used?) that should
help keep the bitmaps around for speed, but if you have lots of different
glyphs, even that gets slowed down. Plus thats a serious memory hit....
Unfortunately, this is the price that we pay for truetype support. If there
is anyone out there that is bored, this area of the code needs to be attacked
with a machete, IMHO.
Jordan
On Tuesday 04 December 2001 10:39, Olaf Winne mentioned:
> Hi all,
>
> I have to display text (a lot) with dynamical updates... I use this:
>
> GrText(wid, gc, POS_MLD_X,(POS_Y_1_2+35*ucCount),cMeldetext, -1,
> GR_TFASCII);
>
> cMeldetext is a char array of my text (40 characters). It takes at least a
> long time until the text is displayed.. You can see each character a once
> appering on the display....
>
> Besides, I use True Types. Is that the probelem? (I try it tomorrow...)
>
> I use Linux 2.4.3. with VGA 16 Color Framebuffer.
>
> Can anybody help???
>
> Thank you,
> Olaf
>
> Am Montag, 3. Dezember 2001 13:29 schrieb linuxhh:
> > Hi, all
> >
> > Now I am porting linux to Cirrus Logic EP7312. My LCD is CSTN with 4096
> > color. So how can I port MicroWindow to my platform? I have finish the
> > linux kernel driver of LCD and can run run linux in my platform. My
> > question is:
> >
> > 1. Because this LCD only have 4096 color, how can I deal with the
> > pallette of MicroWindow? 2. There isn't any code to manage the 12BPP
> > besides in "drivers\fblin12.c". Can I regard my platform as 256 color(
> > 8BPP palette ) or 4096 color( 12BPP 444TrueColor )?
> >
> > Please help me, thanks.
> >
> > Eric
> >
> > ______________________________________
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