new libcairo2-1.9.10 fails to render correctly

All what is said above applies also to the newer build of libcairo2 (1.9.9~git20100620.b8051ee9-0ubuntu0sarvatt2~lucid).
No color blends at all.

thank you for your bug report, you are not using an official ubuntu version though, not sure how bugs for that ppa are tracked usually I will try to get Sarvatt to comment

could you also add a screenshot showing the issue?

Hi Sebastian,

Yes, correct, I have upgraded my system a bit.
On the other hand, the x-org-edgers PPA is meant to be used as a whole, not by using single packages.
Today I upgraded the xserver (1.8.1.902+git20100621) too.

And yes, I am attaching the screenshots here:
1) libcairo-1.8.10.png (rendering OK)
2) libcairo-1.9.9.png (issues with blending).

could be useful to report the bug upstream on bugs.freedesktop.org

Hi Sebastian,

Of coarse reporting upstreams would help, if this is an upstream issue (with libcairo2).
I am not so sure about that though.

On the other hand I do not believe this is an emerald issue anyway, perhaps rather a compiz issue.
If I disable emerald, I can still see issues with color blending (progress bars, scroll bars, button applets etc).

Could someone give info on current emerald packages in ubuntu.
We are using version 0.7.2 in lucid and maverick now.
The newest version around is 0.8.4 though, released 14th October 2009:
http://directory.fsf.org/project/emerald/

I don't notice a such issue on compiz there, emerald is probably not updated because nobody has showned interest to work on it

Hi Sebastian,

I have now narrowed this bug a bit.
It seems to be clear that it is not a bug in compiz nor a bug in emerald.

I removed the emerald and compiz packages completely from my system.
Before that I turned to metacity compositing (metacity --replace).
Then I rebooted the system.
After that I upgraded the libcairo2-1.8.10 to libcairo2-1.9.9~git20100620.b8051ee9-0ubuntu0sarvatt2~lucid.
And I can confirm the bug is still there.

You can see the issues from the screenshots I have attached above:
- issue in the title bar comes only up when emerald is used (because metacity does not blend title bar colors).
- issues in scrollbar remain even emerald and compiz removed.
- issues in buttons (section, status, origin, custom filters, search results) remain even emerald and compiz removed.

Just compare screenshots (from desktop with synaptic open) libcairo2-1.8.10.png and libcairo2-1.9.9.png.
It really is a bug concerning color blends and the older package libcairo2-1.9.8 and the newer libcairo-1.9.9,
but not the stable package libcairo2-1.8.10.

There is another bug report around with same symptoms, possibly a duplicate:
bug #597987

I opened the emerald task because one of the cairo developers said that emerald was using the cairo api incorrectly and would be a problem with the next release.

So it may very well be that many of the rendering issues with the new development version of cairo are in fact issues in several other "stable" applications using cairo application programming interface (API).
Anyone, feel free to report this upstreams.

upstream comments on IRC about the issue

"that looks just like emerald playing games with writing to surfaces behind cairo's back.
you can probably simply ignore the issue by commenting out line 322 in src/cairo-image-surface.c but then the bugs become much more subtle.
any time that they modify the pixels obtained through cairo_image_surface_get_data() or by keeping the pointer used for cairo_image_surface_create_for_data(), then they must call cairo_surface_flush() before modification and cairo_surface_mark_diry() afterwards"

closing the cairo task since bug #601220 is about the same issue using official ubuntu versions

This package has been removed from Ubuntu. Closing all related bugs.