[OpenJDK 2D-Dev] Thoughts about font implementation

[Roman Kennke]

... Here comes the promised stacktrace and example app.

Exception in thread "main" java.lang.NullPointerException
	at sun.font.TrueTypeGlyphMapper.<init>(TrueTypeGlyphMapper.java:62)
	at sun.font.TrueTypeFont.getMapper(TrueTypeFont.java:1232)
	at sun.font.FileFontStrike.<init>(FileFontStrike.java:170)
	at sun.font.FileFont.createStrike(FileFont.java:104)
	at sun.font.Font2D.getStrike(Font2D.java:359)
	at sun.font.Font2D.getStrike(Font2D.java:266)
	at sun.java2d.SunGraphics2D.checkFontInfo(SunGraphics2D.java:700)
	at sun.java2d.SunGraphics2D.getFontInfo(SunGraphics2D.java:755)
	at sun.java2d.pipe.GlyphListPipe.drawString(GlyphListPipe.java:50)
	at sun.java2d.pipe.ValidatePipe.drawString(ValidatePipe.java:165)
	at sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2805)
	at TestFontsPerformance.main(TestFontsPerformance.java:21)

Am Dienstag, den 12.08.2008, 23:22 +0200 schrieb Roman Kennke:
> Hi Igor,
> 
> > Anyway, i promise i'll look into this in more detail as i get some
> > spare 
> > time (that is really rare these days :()
> 
> Thanks alot.
> 
> > >> From the top of the head i'd sugegst to check impact of such change
> > on 
> > >> performance and perceived
> > >> footprint scanning large set of large fonts.
> > >> 
> > >
> > > I can do that. Any suggestions on how to do that easily? I'm not
> > sure
> > > how that (FreeType) implementation works, but I know at least one
> > font
> > > implementation that doesn't actually load anything until the
> > > corresponding glyphs are needed (also mmap-based, very handy... this
> > is
> > > the code in Classpath, all Java, all nice :-D ).
> > > 
> > Both freetype and t2k do not read everything explicitly too.
> > However, to build list of all available fonts we have to scan some 
> > tables in all files.
> > And it will be unfortunate if process size will grew by total size of 
> > all fonts.
> 
> 
> > Quick tests are: run Font2DTest on system that has some really large 
> > ttf/ttc files.
> > 
> > Write simple test that iterates through all available fonts and draw
> > one 
> > or all glyphs to bufferedimage.
> 
> I wrote a simple test program that gets an array of all fonts and gets
> the baseline for all 0-0xffff characters. (Drawing stuff to BI didn't
> work due to NPE, see stacktrace below. BTW, this makes everything, e.g.
> SwingSet2, kindof unstable, is this a known bug?)
> 
> 10 runs of this program with my patch take: 4338ms
> 10 runs of this program w/o  my patch take: 4492ms
> 
> And I can say from the output that the jitter is not very big here. (The
> values of the runs with and w/o my patch do not overlap). Seems like a
> small but noticable performance improvement. This is on Linux though.
> 
> One interesting note here: Everytime this program is run, it shows a
> different number of fonts (around 285-302 fonts). On an OpenJDK6 system
> it constantly shows 360 fonts.
> 
> > >> I likely be mistaken here 
> > >> but on some platforms
> > >> (Windows) this might have noticeable negative consequences.
> > >> 
> > >
> > > Unfortunately, I don't have a Windows box around, and can't setup
> > one
> > > easily. Windows licenses and VS licenses are too costly for my
> > taste.
> > > Also, at work, some people tried to setup a build of OpenJDK on
> > Windows
> > > and failed (or at least, did not succeed after 16 hours of work or
> > so).
> > > 
> > It will be nice to hear why it does not build on Windows.
> > I am quite sure OpenJDK is buildable with commercial VS and
> > i know that some people were building it with VS Express too (with
> > minor 
> > tweaks).
> 
> I can ask.
> 
> Cheers, Roman
> 
-- 
http://kennke.org/blog/
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