Some websites have a small pop-up that will display information, such as time since a post, information about a link, etc. etc.. In Xpra certain browsers will cause them to display a cross-hatching of colored lines before moving the mouse causes the proper pop-up to appear, with the lines just at the very bottom of the pop-up.
Interestingly, the pop-ups are only a problem in Chrome, not Firefox. The Firefox pop-ups are a solid white color, rather than the black (possibly partially transparent?) color in Chrome.
Currently running Xpra 0.11.x r5209 in Windows 7 64-bit. I'll attach a few screenshots to explain further.
the bugged pop-up in Chrome.
The pop-up working properly in Firefox
The pop-up working on interfacelift in Chrome
The pop-up working on twitch in chrome
Pop up working semi-properly on bmwusa after moving the mouse
pop-up showing colors after moving mouse on twitch
I forgot to mention in the original post, but in some websites the pop-ups behave as expected in Chrome, and in others it shows up bugged. I'm not sure yet why.
I don't think the colour (black vs white) is relevant here: browsers are free to style alt tags as they wish, it may just be how those two browsers do it. You can verify this by running the browser natively (without involving xpra).
XPRA_ALPHA=0 xpra start ...
xpra info|grep windowcaptured when the tooltip window is showing could be useful too
rgb) Does it happen with encodings that do not support transparency? (
Raising the priority: I'm waiting to hear on this bug to release 0.11.1
To answer your questions:
Interestingly instead of turning normal when you move the mouse like it does in the screenshot, the text just shifts over a couple of pixels to the right.
pngencodings work fine.
raw RGB + zlib/lz4has the bug.
How do I use
xpra info|grep window?
Okay, Alex showed me how to use it. I'll attach the relevant .txt.
the file generated after running "xpra info | grep window > xprainfo.txt"
Thanks for the details, so this is not transparency or GL related, only raw
RGB has this problem.
From the xpra info log, the tooltip window is (I'm only showing the most relevant bits):
window.window-type=('TOOLTIP',) window.total_frames[rgb24]=1 window.total_pixels[rgb24]=4002 window.size=(174, 23) window.override-redirect=True window.has-alpha=True window.encoding=h264 window.encoding.last_used=rgb24
Human readable summary: the window is a
override-redirect window and we only send a single pixel update (
4002) which is using
rgb24 because it is small enough, and not
rgb32 because the client probably does not support it (win32 I assume). The global encoding seems to be set to
h264, but we never create a video context for small transient windows like these.
And judging by the screenshot, it looks like the
rgb24 data is being processed as if it was
rgb32. This is strange but at least now I know where to look.
Updated the bug title: it isn't with
ALT tags, at least not in chrome, but with title tags (on both images and links).
A good page to test this is: links-testing.
I get the tooltip to show with chrome on tests: 13, 11, 10 (image only), 9, 8 (image only), 6, 5, 4, 3, 2
simplest html test case possible
Fixed in r5262 (r5263 for v0.11.x branch) by not sending alpha: we tell the server we don't handle
RGBA on win32 or OSX, this means we strip the alpha server side.
The reason why we didn't do this normally is that:
In the process of debugging, I cleaned up the GL codepath: r5261
I am keeping this ticket open because we should be able to handle
RGBA pixels client side, even when we don't actually paint the alpha channel.
May be related to #521
I am still seeing this issue on chrome (and lazarus) with osx client 0.12.0 r5531 and fedora 19 server 0.12.0 r 5531. Interestingly though, with firefox the tooltips are behaving as expected.
window.window-type=('TOOLTIP',) window.total_frames[png]=1 window.total_pixels[png]=3772 window.size=(164, 23) window.override-redirect=True window.has-alpha=True window.encoding=png window.encoding.last_used=png
window.window-type=('TOOLTIP',) window.total_frames[png]=1 window.total_pixels[png]=3744 window.size=(156, 24) window.override-redirect=True window.has-alpha=False window.encoding=png window.encoding.last_used=png
As expected this is because of the alpha channel: firefox doesn't use alpha but chrome does (look for
So, the core issue was that we were converting
RGBX but still sending it as
rgb24, and it needs to be
Most of the important fixes have been backported.
afarr: Feel free to close this ticket if everything works as expected, and if you have time please also check #521
Are the fixes meant to fix that? Is there some way to override the alpha for tooltips?
The interesting (but unsurprising now) bits of
xpra info | grep window:
window.has-alpha=True window.window-type=('TOOLTIP',) window.total_frames[png]=2 window.total_pixels[png]=12282 window.override-redirect=True window.size=(267, 23) window.override-redirect=True window.encoding=png
r5692 osx client chrome/lazarus tooltips still misbehaving
AFAICT, this is a different bug with the exact same symptom, as it only occurs on OSX now. win32 is now fine and it wasn't before.
Which means that I will probably have to blacklist OSX for 32-bit RGB support. But I am now blocked by #529. Oh joy.
Help... with r5760 on server and client, I just cannot reproduce this at all now. Which is odd because I haven't made any changes that should have fixed this (and I've just skimmed the list of changes since r5700), and I was seeing the problem 6 days ago!?
I also hacked my server to remove other encodings completely (to make sure only
rgb would get used), tried other encodings, etc. No luck!?
Can you still reproduce?
Got it at last! (by trying various archived beta builds to narrow things down), counterintuitively this is a real bug that has been there for much longer but only came to the surface because packaging problems on OSX prevented the inclusion of PIL (Python Imaging Library) in the disk image (and recent build improvements fixed that - which made the bug disappear from view).
Without PIL, the code reverts to the slower GDK image loading code... which did not deal with
rgb32 and assumed the data could only be
rgb24... r5771 fixes that.
In order to test this alternative codepath, you need to run a client without PIL installed (for example by removing PIL from the installation image) or using the environment variable:
XPRA_USE_PIL=0 xpra attach ...
Feel free to just test that things look good instead, and close this ticket.
Ok, testing with
XPRA_USE_PIL=0 the tooltips display as expected with all browsers (including with
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/500