java-gnome-developer

[Java-gnome-developer] cairo-java / getMatrix() problem

[David G. <dav...@ob...>]

Hi,

I'm going a little outside my comfort zone and trying out cairo-java.  So far, it is 
going pretty well, and I've got some nice things working. But, I'm having some 
trouble when I try out transformations, specifically the following code:

         ImageSurface surface = new ImageSurface(Format.ARGB32, 300, 200);
         Context context = new Context(surface);
         Matrix m = context.getMatrix();

...generates this error message:

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  SIGSEGV (0xb) at pc=0xab1b9a73, pid=10577, tid=16384
#
# Java VM: Java HotSpot(TM) Client VM (1.4.2_09-b05 mixed mode)
# Problematic frame:
# C  [libcairo.so.2+0xca73]

I'm running Eclipse on JDK 1.4.2_09 on Gentoo Linux, and I installed the 
cairo-java-1.0.1.ebuild.

I can provide additional information if required.  I have no experience using 
"native" libraries, so I don't know what's relevant information and what's not.  Any 
help will be greatly appreciated.

Regards,

Dave Gilbert

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[Ismael J. <ml...@ju...>]

On Thu, 2005-12-01 at 13:12 +0000, David Gilbert wrote:
[...]
> #
> # An unexpected error has been detected by HotSpot Virtual Machine:
> #
> #  SIGSEGV (0xb) at pc=0xab1b9a73, pid=10577, tid=16384
> #
> # Java VM: Java HotSpot(TM) Client VM (1.4.2_09-b05 mixed mode)
> # Problematic frame:
> # C  [libcairo.so.2+0xca73]
> 
[...]

Hi,

It seems like a bug in the library. It would be useful if you could post
a bug report[1], so that this doesn't get lost. Regarding relevant
information to put in the bug report, the ideal is a runnable test case.
This is obviously not always possible, and the information you provided
in your email message is generally good enough, but you may probably
want to attach the file generated by the Sun JVM when it crashes. It's
usually in the directory where the app was launched from or the home
directory. Thanks. 

Regards,
Ismael

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=cairo-java

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[David G. <dav...@ob...>]

Ismael Juma wrote:

>On Thu, 2005-12-01 at 13:12 +0000, David Gilbert wrote:
>[...]
>  
>
>>#
>># An unexpected error has been detected by HotSpot Virtual Machine:
>>#
>>#  SIGSEGV (0xb) at pc=0xab1b9a73, pid=10577, tid=16384
>>#
>># Java VM: Java HotSpot(TM) Client VM (1.4.2_09-b05 mixed mode)
>># Problematic frame:
>># C  [libcairo.so.2+0xca73]
>>
>>    
>>
>[...]
>
>Hi,
>
>It seems like a bug in the library. It would be useful if you could post
>a bug report[1], so that this doesn't get lost. Regarding relevant
>information to put in the bug report, the ideal is a runnable test case.
>This is obviously not always possible, and the information you provided
>in your email message is generally good enough, but you may probably
>want to attach the file generated by the Sun JVM when it crashes. It's
>usually in the directory where the app was launched from or the home
>directory. Thanks. 
>
>Regards,
>Ismael
>
>[1] https://bugs.freedesktop.org/enter_bug.cgi?product=cairo-java
>
>
>
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>
>
>  
>
Thanks for the quick response.  I'd like to try your patch, but so far I 
have not succeeded in building cairo-java from CVS.  I get this error 
when I execute 'make':

/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../../i686-pc-linux-gnu/bin/ld: 
cannot find -lglibjava
collect2: ld returned 1 exit status
make[1]: *** [libcairojava.la] Error 1
make[1]: Leaving directory `/home/dgilbert/cairo-java-cvs/cairo-java'
make: *** [all] Error 2

I know nothing about this stuff, I only got cairo-java working via the 
Gentoo ebuild.  Any hints?

Regards,

Dave Gilbert

P.S.  By the way, my interest in cairo-java is to create a 
CairoGraphics2D class that can be used with JFreeChart (and any other 
applications that use the Graphics2D API).  I started that and got some 
promising results before running into the getMatrix() problem.  Here are 
some PNG images I created with a very basic Graphics2D implementation 
(I'm sure it can be improved a lot):

http://www.object-refinery.com/jfreechart/cairo/PieChartTest.png

http://www.object-refinery.com/jfreechart/cairo/BarChartTest.png

http://www.object-refinery.com/jfreechart/cairo/TimeChartTest.png

This is running on Sun's JDK but I'm hopeful of getting the same thing 
running on JamVM and GNU Classpath.

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[Joao V. <jvi...@ya...>]

--- David Gilbert <dav...@ob...> escreveu:
> http://www.object-refinery.com/jfreechart/cairo/PieChartTest.png
> 
> http://www.object-refinery.com/jfreechart/cairo/BarChartTest.png
> 
> http://www.object-refinery.com/jfreechart/cairo/TimeChartTest.png
> 
> This is running on Sun's JDK but I'm hopeful of getting the same thing 
> running on JamVM and GNU Classpath.

Oh, that's awesome! I had thought about doing exactly that a while back, but the Cairo bindings
were too in-the-beginning, so i didn't go further. But this is really great.

Cheers,
J.V.



	


	
		
_______________________________________________________ 
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Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[Andrew C. <an...@op...>]

On Thu, 2005-01-12 at 19:47 +0000, David Gilbert wrote:

> I'd like to try your patch, but so far I=20
> have not succeeded in building cairo-java from CVS.  I get this error=20
> when I execute 'make':
>=20
> /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../../i686-pc-linux-gnu/bi=
n/ld:=20
> cannot find -lglibjava
...
> I know nothing about this stuff, I only got cairo-java working via the=20
> Gentoo ebuild.  Any hints?

So we just talked this over in #java-gnome, and I have a hypothesis for
you.

-lglibjava is the library that we generate when you compile to native in
using GCJ that is effectively the equivalent of glib.jar. In the Gentoo
ebuilds, it only gets built if you have USE=3Dgcj set in your USE flags
(either /etc/make.conf, /etc/portage/packages.use or on emerge command
line)

So, my speculation is that you're not finding /usr/lib/libglibjava.so
because the glib-java package was built USE=3D-gcj (either explicitly by
you, or as a default by not setting the gcj use flag).

If that is so, then when you are trying to build cairo-java from CVS,
you have configured as --with-gcj-compile which is the default. As a
workaround, you can probably do

         $ ./configure --without-gcj-compile --prefix=3D/opt/blah...

Then it won't try and build the gcj native libraries libcairojava.so
that is the equivalents of cairo.jar, which means you won't need
libglibjava.so. Give it a try and let us know?

[Or, you could re emerge glib-java with USE=3Dgcj active - all assuming
that this hypothesis is correct]

Be aware that in general, if you're building something from CVS, you end
up needing to build the dependencies from CVS. That is (probably) not
necessary in this case, but there are one or two few bug fixes in
glib-java since we released 0.2.1. FYI.

AfC
Bangalore

--=20
Andrew Frederick Cowie
Operational Dynamics

Website: http://www.operationaldynamics.com/
Blog: http://research.operationaldynamics.com/blogs/andrew/
GPG key: 0945 9282 449C 0058 1FF5  2852 2D51 130C 57F6 E7BD

Sydney    +61 2 9977 6866
New York  +1 646 472 5054
Toronto   +1 416 848 6072
London    +44 207 1019201

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[David G. <dav...@ob...>]

Andrew Cowie wrote:

>On Thu, 2005-01-12 at 19:47 +0000, David Gilbert wrote:
>
>  
>
>>I'd like to try your patch, but so far I 
>>have not succeeded in building cairo-java from CVS.  I get this error 
>>when I execute 'make':
>>
>>/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../../i686-pc-linux-gnu/bin/ld: 
>>cannot find -lglibjava
>>    
>>
>...
>  
>
>>I know nothing about this stuff, I only got cairo-java working via the 
>>Gentoo ebuild.  Any hints?
>>    
>>
>
>So we just talked this over in #java-gnome, and I have a hypothesis for
>you.
>
>-lglibjava is the library that we generate when you compile to native in
>using GCJ that is effectively the equivalent of glib.jar. In the Gentoo
>ebuilds, it only gets built if you have USE=gcj set in your USE flags
>(either /etc/make.conf, /etc/portage/packages.use or on emerge command
>line)
>
>So, my speculation is that you're not finding /usr/lib/libglibjava.so
>because the glib-java package was built USE=-gcj (either explicitly by
>you, or as a default by not setting the gcj use flag).
>
>If that is so, then when you are trying to build cairo-java from CVS,
>you have configured as --with-gcj-compile which is the default. As a
>workaround, you can probably do
>
>         $ ./configure --without-gcj-compile --prefix=/opt/blah...
>
>Then it won't try and build the gcj native libraries libcairojava.so
>that is the equivalents of cairo.jar, which means you won't need
>libglibjava.so. Give it a try and let us know?
>
>[Or, you could re emerge glib-java with USE=gcj active - all assuming
>that this hypothesis is correct]
>
>Be aware that in general, if you're building something from CVS, you end
>up needing to build the dependencies from CVS. That is (probably) not
>necessary in this case, but there are one or two few bug fixes in
>glib-java since we released 0.2.1. FYI.
>
>AfC
>Bangalore
>  
>
Thanks Andrew, this fixed the problem for me and allowed me to make more 
progress with my CairoGraphics2D class.  I'll post a new thread to show 
you what I mean...

Regards,

Dave

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[Ismael J. <ml...@ju...>]

On Thu, 2005-12-01 at 19:47 +0000, David Gilbert wrote:
[...]
> Thanks for the quick response.  I'd like to try your patch, but so far I 
> have not succeeded in building cairo-java from CVS.  I get this error 
> when I execute 'make':
> 
> /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/../../../../i686-pc-linux-gnu/bin/ld: 
> cannot find -lglibjava
> collect2: ld returned 1 exit status
> make[1]: *** [libcairojava.la] Error 1
> make[1]: Leaving directory `/home/dgilbert/cairo-java-cvs/cairo-java'
> make: *** [all] Error 2
> 
> I know nothing about this stuff, I only got cairo-java working via the 
> Gentoo ebuild.  Any hints?

I don't know much about the gentoo ebuilds myself, and from the error
snippet, it's not apparent what's going wrong. The problem is occurring
in the native compilation step, however, so you can skip that step while
we're trying to figure out why the problem is happening if you so wish.
This can be done by passing --without-gcj-compile to autogen.sh or
configure.

To help us figure out why the problem is happening, it would be useful
if you could post the whole output instead of just that small fragment.

> P.S.  By the way, my interest in cairo-java is to create a 
> CairoGraphics2D class that can be used with JFreeChart (and any other 
> applications that use the Graphics2D API).  I started that and got some 
> promising results before running into the getMatrix() problem.  Here are 
> some PNG images I created with a very basic Graphics2D implementation 
> (I'm sure it can be improved a lot):
> 
> http://www.object-refinery.com/jfreechart/cairo/PieChartTest.png
> 
> http://www.object-refinery.com/jfreechart/cairo/BarChartTest.png
> 
> http://www.object-refinery.com/jfreechart/cairo/TimeChartTest.png
> 
> This is running on Sun's JDK but I'm hopeful of getting the same thing 
> running on JamVM and GNU Classpath.

Very cool! :)

Regards,
Ismael

Re: [Java-gnome-developer] cairo-java / getMatrix() problem

[Ismael J. <ml...@ju...>]

One thing I forgot to mention, if you'd like a more real-time
interaction, the people involved with the project are often in the
#java-gnome channel at irc.gimp.net.

Ismael