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#mythtv IRC Logs for 2008-04-22

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06:39<gbee>Chutt: Think I've got a small problem with mythuiimage and image transparency - when mythuiimage loads a new image the old one is bleeding through beneath it
06:41<gbee>gl painter
06:42<gbee>curiously forcing a repaint doesn't fix it, so maybe it's not the painter but something I'm doing wrong
06:45<gbee>http://pastebin.ca/993084 << Maybe someone more familiar with QPainter could tell me what's wrong with that and how it might be improved
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06:50<gbee>it's just proof of concept, so messy but I'm not sure why it's given a black background instead of transparent
06:51<gbee>ok, figured it out - working better now
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08:45<gbee>mythui image reflection demo (ignore the rest of the page, it's a work in progress) - http://miffteevee.co.uk/imagebin/mythui_imagereflection.png
08:45<laga>ooooh!
08:45<stuarta>blingtastic!
08:46<laga>i thought it was just a normal mirror
08:47<GreyFoxx>hahah cool
08:48<gbee>laga: the themer will have the option of specifying the shear/scale of the reflection so straight mirror reflections and angled styles will be possible
08:49<gbee>I'll knock up a proper demo screen later, I just reused the netflix poster image because it was quicker, but they are tiny images and not a great demo
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11:16<Chutt>gbee, just doing the manipulation in qimage?
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11:21<gbee>yeah, not quite the dynamic reflections that opengl etc could offer but it's a quick and easy solution until someone comes up with something better
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11:22<gbee>really more of a proof of concept, I just wanted to see how difficult it would be with QImage
11:22<gbee>http://pastebin.ca/993329
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11:23<gbee>can probably be tuned so that it's more efficient
11:23<Chutt>take it from the qt demos archive?
11:23<Chutt>heh
11:23<Chutt>look at lines 4 +13
11:23<Chutt> if (axis == ReflectHorizontal)
11:24<Chutt> else if (axis == ReflectHorizontal)
11:24<gbee>doh
11:24<gbee>I cobbled it together from reading the QImage, QMatrix man pages - if there was a demo I wish I'd found it earlier
11:25<Chutt>that exact thing is demoed
11:25<gbee>I'll have a look, if there is then it should do things the "right way"
11:26<gbee>well, haven't completely wasted my time I guess, I know QImage,QPainter and QMatrix a little better than I did before :p
11:27<Chutt>hrm
11:27<Chutt>i don't remember where the demos are
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11:41<gbee>I'll find it tonight
11:50<Chutt>it was pasted in here a while back
11:58<Chutt>gbee, http://labs.trolltech.com/page/Graphics/Examples
12:01<gbee>thanks
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12:07<gbee>at first glance looks very similar to my effort, not as flexible - can't adjust shear, or shear on horizontal mirroring
12:08<gbee>I'll see what I can learn from it though, e.g. it uses the painter in a couple of places that I've used QImage methods (e.g. copy)
12:10<gbee>QLinearGradient - Never noticed that before, could replace MythImage::MakeGradient() maybe?
12:16<Chutt>yup
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12:42<gbee>nicer demo of the vertical (X axis) reflection - http://miffteevee.co.uk/imagebin/mythui_imagereflection1.png
12:43<Chutt>angle's too high, but, cool.
12:45<gbee>angle etc is fully themeable, so themers can tweak the effect to suit
12:45<Chutt>cool.
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12:49<gbee>http://miffteevee.co.uk/imagebin/mythui_imagereflection2.png << 50% shear instead of 80%
12:49<Chutt>better, yeah
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12:51<Chutt>how fast is that?
12:51<Chutt>ie, does it cache the mirrored image?
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12:52<gbee>it's done when the image is loaded and not when it's displayed, so as long as the image is in memory it's not repeated
12:52<gbee>but I've not actually benchmarked it
12:53<gbee>probably wouldn't recommend it be used for static theme images, at least not until the theme cache is reorganised so we can can save the new image to disk
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14:21<gbee>Anduin: do you want to take #5241?
14:24<Anduin>gbee: I can if you like (almost did but then noticed it wasn't ijr's)
14:24<gbee>since it's not directly in the xmltv or main mfdb code and I'm busy with mythui I'd appreciate someone taking it from me
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14:24<Anduin>Yup, done
14:26<gbee>I only assigned myself as the "go to dev" for mfdb to catch tickets concerning bugs in the xmltv changes I made last year, plus I've some additional xmltv changes to make
14:27<gbee>thanks
14:27<gbee>:)
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16:05<gbee>Chutt: I've replaced the existing MakeGradient with the following which uses QLinearGradient and DrawRect instead of iterating through a line at a time to draw the fill/boundary, anything need changing? http://pastebin.ca/993705
16:06<Chutt>'slong as it works, looks fine to me
16:06<gbee>cool
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16:20<gbee>http://pastebin.ca/993720 http://miffteevee.co.uk/imagebin/mythui_imagereflection3.png
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16:39<janneg>gbee: the horizontal reflection looks great especially with the thin red line poster but not together with the vertical reflection
16:41<janneg>danielk22: do you have already plans for the linuxtag booth?
16:42<danielk22>two small areas, both with seating and lamps. One with a sofa + plasma, one with a plain old LCD.
16:43<danielk22>graphics are really decided yet.
16:44<danielk22>are -> are not
16:45<danielk22>is there still a qt4 ticket?
16:45<danielk22>I just found three dialog instantiations in the NVP which cause reliable segfaults under Qt4
16:48<janneg>a tracking ticket for the qt4 merge? I don't think so. we were tracking the issues before the merge manually
16:49<danielk22>k, I'll create a ticket for these then.
16:49<gbee>OSD?
16:49<danielk22>Nope creating dialogs outside Qt event thread.
16:49<gbee>ahh
16:51<danielk22>#5242 -- just committed a temporary work around, disabling error reporting.
16:53<danielk22>anyone else notice that theme image scaling now kills Xorg performance?
16:53<Chutt>the initial load?
16:53<danielk22>yup
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16:53<Chutt>it's probably a bad interaction with qt + opengl
16:53<danielk22>it's making Xorg use 99% CPU.. so the whole UI is unresponsive.
16:54<danielk22>I'
16:54<danielk22>m not using the OpenGL renderer
16:54<Chutt>painter?
16:54<danielk22>qt
16:54<Chutt>doesn't happen here..
16:54<danielk22>hmm, ok -- once I get video playback back I'll look into it.
16:55<danielk22>right now it fails to allocate a GC 50% of the time...
16:56<Chutt>yah, just verified several times
16:56<Chutt>mythfrontend takes 96% cpu, xorg 2%
16:56<danielk22>which is normal
16:57<danielk22>Here mythtv is using 2-3% cpu, Xorg 99% and 95% idle on the second CPU.
16:59<Chutt>those error popups should just post an event, and then a simple error popup handler elsewhere should work..
16:59<danielk22>yeah
16:59<danielk22>except some of them block for input, but I don't think it has to be that way.
16:59<Chutt>they still could, as long as the handler wasn't in the tv widget
17:00<Chutt>ie, it could still be shutting down
17:00<Chutt>in the background, while the popup was active
17:00<danielk22>Are QEvents still kosher in Qt4? I noticed QCustomEvent's had been changed in the code.
17:01<Chutt>yeah, they're fine
17:01<Chutt>just had to change the customevents a tiny bit
17:01<danielk22>but references in signals & slots are not, correct? due to the new queued signals?
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17:02<Chutt>i thought they were still immediate
17:03<danielk22>Only if within the same QThread.
17:03<danielk22>if you send them in pthreads or between threads they are queued by default.
17:03<Chutt>ah
17:03<Chutt>neat
17:03<Chutt>that's changeable (via connect)
17:03<danielk22>yup
17:04<Chutt>but, that's a nice change, actually
17:04<Chutt>we've had lots of cross-thread issues with signals and slots
17:04<danielk22>I was reading up on it a bit yesterday for the signal monitor stuff. it wasn't working at all.
17:04<danielk22>yeah
17:04<Chutt>heh
17:04<Chutt>probably because there wasn't a qt event thread for that?
17:05<danielk22>and we still have the QString problem. I wish they would fix that...
17:05<danielk22>a few reasons. I tried the quick fix of using a qt event thread and ran into the reference problem..
17:05<danielk22>but I had long ago planned to use callbacks anyway since this is used for the recorders..
17:05<danielk22>so :)
17:06<Chutt>heh
17:06<Chutt>i've not really seen any qt4 issues lately
17:06<Chutt>but then, all i do is record + watch tv
17:06<Chutt>"To sum it up, implicitly shared classes in Qt 4 are really implicitly shared. Even in multithreaded applications, you can safely use them as if they were plain, non-shared, reentrant value-based classes."
17:07<danielk22>I'm having serious issues with video playback..
17:07<Chutt>that would indicate that they've fixed qstring
17:07<danielk22>nope, re-enterant, not thread-safe.
17:07<Chutt>well, yeah, you can't use the same instance
17:07<danielk22>if you assign values to a strings they break
17:07<Chutt>really?
17:07<Chutt>even with the atomic refcounting?
17:08<danielk22>well the atomic refcounting makes them *much* safer, but not a 100%
17:08<danielk22>plus a few functions like local8bit and ascii are not re-enterant.
17:09<Chutt>but we shouldn't be calling those from different threads..
17:09<Chutt>(on the same object)
17:09<Chutt>anyway - what playback issues are you seeing?
17:09<danielk22>well about 50% of the time XCreateGC(XJ_disp, XJ_win, 0, 0); fails
17:10<danielk22>and when it does work I get blinking black squares on the video.
17:10<danielk22>http://www.pastebin.ca/993784
17:10<Chutt>the blinking black squares should've been fixed a while back
17:10<Chutt>an issue with the playbackbox code redrawing incorrectly
17:11<Chutt>try disabling the preview video/pixmap
17:11<danielk22>might be, I'm having too much trouble just getting video to reproduce that.
17:11<danielk22>k
17:13<gbee>danielk22: I've not noticed performance issues with scaling, in fact it's much faster to load now with both painters and doesn't seem to impact Xorg
17:13<danielk22>gbee: it's no slower to scale, it just bogs down X doing it.
17:14<danielk22>it also likes to prescale the images all the time, the cache does not appear to be working
17:15<danielk22>getting this on the console: http://www.pastebin.ca/993790
17:16<gbee>hmm, X doesn't get above 10% here and spends most of the time ~2%
17:16<danielk22>repeated many times
17:16<gbee>which theme?
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17:18<danielk22>chutt: no effect
17:18<danielk22>gbee: MythCenter (Widescreen)
17:18<gbee>best guess it's something to do with the progress bar, but I've not seen it and I've no idea as to the cause
17:19<danielk22>trying GANT now
17:19<Chutt>i was using mepo-wide
17:19<gbee>I've been testing mythui changes with MythCenter, so it's not the theme, we've not even loaded the theme at that point anyway
17:19<danielk22>k, GANT does not show the problem.
17:20<Chutt>that doesn't make any sense =)
17:20<gbee>doubt it's the qtlook.txt either, though that does define the look/behaviour of that dialog
17:20<danielk22>It still prints those QPainter messages, but it's quite quick, and doesn't forget caching.
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17:20<gbee>weird ...
17:21<gbee>qt 4.3?
17:21<danielk22>I do have two MythCenter-wide.XXX.XXX in my theme cache.. 3 resolutions cached in total.
17:21<danielk22>4.4.0-rc1
17:22<danielk22>hmm, let me reinstall MythCenter-wide and delete the cache before you spend too much time thinking about this...
17:22<gbee>k
17:24<Chutt>i don't know if anyone else has tested 4.4.0-rc1
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17:26<danielk22>wasn't Janne talking about 4.4.x for the browser component?
17:27<Chutt>yeah, but, that's future dev
17:27<gbee>qt 4.4 includes webkit which would give us a much better base for mythbrowser than konqueror
17:28<danielk22>ah, ic :) I guess I wasn't following along closely enough.
17:29<Chutt>mythbrowser's gone completely, for now
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17:53<janneg>no, I haven't tested qt4.4. but a user in #mythtv-de did, there were some easily resolvable problems but I forgot the details
17:54<janneg>working lately on a linux driver which many mythtv user will find more important than direct work on mythtv
17:55<danielk22>hmm, it looks like a couple sleep(1) 's in videoout_xv.cpp makes it work here...
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20:39<Chase>I'm interested in extending network control so that when the frontend changes location, the network control spits out the new location
20:39<Chase>so a remote controller doesn't need to poll the location
20:40<Chase>it seems that adding calls to NetworkController from within MythContext::addCurrentLocation etc would do it
20:40<Chase>but of course there's no way to get to the frontend's NetworkController from MythContext right now
20:40<Chase>what would be the best way to do this?
20:43<Chase>I could add a reference in MythContextPrivate, but I'm guessing that would be frowned upon
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---Logclosed Wed Apr 23 00:00:02 2008