[SailfishDevel] app crashed when using Canvas in Dialog page

Gunnar Sletta gunnar.sletta at jolla.com
Thu Aug 14 09:20:01 UTC 2014


On 14 Aug 2014, at 10:39, Samuli Silvius <samuli.silvius at gmail.com> wrote:

> Thanks, great to hear! Update coming this month?

You'll hear from the right parties when the dates have been set :)

> 
> -Samuli
> 
> 
> 2014-08-14 11:34 GMT+03:00 Gunnar Sletta <gunnar.sletta at jolla.com>:
> 
> On 14 Aug 2014, at 09:21, Samuli Silvius <samuli.silvius at gmail.com> wrote:
> 
> > Hi,
> >
> > Complete app here
> > https://github.com/tace/jolla2gether.git
> > I created a branch "canvas_crash" for you. The canvas code is in https://github.com/tace/jolla2gether/blob/canvas_crash/qml/components/ExternalLinkDialog.qml.
> >
> > To reproduce the problem.
> > 1. Start app and select "Questions" from pull menu
> > 2. Open any question page having picture. E.g. put to search criteria (from pull menu) "summer" and you will see this question https://together.jolla.com/question/44887/high-contrast-ambiences-summer-ready/ which has some pics.
> > 3. Click a picture and you are on the Dialog page where the Canvas is.
> > 4. Now swipe right i.e. cancel the dialog and then click the picture again to enter Dialog page again. Repeat this until app crashes.
> 
> I couldn't reproduce a crash with 50 consecutive open/cancel, so I'm thinking this will be fixed in the next update then.
> 
> cheers,
> Gunnar
> 
> >
> > Br
> > -Samuli
> >
> >
> > 2014-08-14 9:53 GMT+03:00 Gunnar Sletta <gunnar.sletta at jolla.com>:
> > Hi,
> >
> > I'm hoping this will already be fixed in update 9 by the cleanup improvements I did to the canvas implementation a few weeks ago, but just to be on the safe side, I'd like to test it. Is there an example or app I could try to verify that? (I'd prefer to get a complete example rather than recreating it based on the posted code segment to ensure that it is covering the right cases)
> >
> > cheers,
> > Gunnar
> >
> >
> > On 13 Aug 2014, at 21:39, Samuli Silvius <samuli.silvius at gmail.com> wrote:
> >
> > > I tried FramebufferObject and now app crashes immediately when opening that dialog page, right after Canvas's onPaint is executed (I have console.log on last line of onPaint()).
> > >
> > >
> > > [W] QWaylandGLContext::makeCurrent:100 - QEGLPlatformContext::makeCurrent: eglError: 3002, this: 0x71661d28
> > >
> > >
> > > [W] GLAcquireContext::GLAcquireContext:80 - Can't make current GL context
> > >
> > > Remote application crashed: Process killed by signal
> > >
> > >
> > > 2014-08-13 22:27 GMT+03:00 Kimmo Lindholm <Kimmo.Lindholm at eke.fi>:
> > > ok.
> > >
> > >
> > >
> > > I have not used renderStrategy at all in paint,
> > >
> > > but renderTarget: Canvas.FramebufferObject
> > >
> > >
> > >
> > > I have also dialogs there, and only way I got it broken, is that vkb case.
> > >
> > >
> > >
> > > -kimmo
> > >
> > >
> > >
> > > From: devel-bounces at lists.sailfishos.org [mailto:devel-bounces at lists.sailfishos.org] On Behalf Of Samuli Silvius
> > > Sent: Wednesday, August 13, 2014 10:20 PM
> > >
> > >
> > > To: Sailfish OS Developers
> > > Subject: Re: [SailfishDevel] app crashed when using Canvas in Dialog page
> > >
> > >
> > >
> > > No vkb used on that page. Only couple of TextSwitch:es
> > >
> > >
> > >
> > > -Samuli
> > >
> > >
> > >
> > > 2014-08-13 22:15 GMT+03:00 Kimmo Lindholm <Kimmo.Lindholm at eke.fi>:
> > >
> > > Do you have virtual keyboard visible when closing dialog?
> > >
> > >
> > >
> > > https://together.jolla.com/question/44780/closing-dialog-with-vkb-active-breaks-canvas-on-returning-page/
> > >
> > >
> > >
> > > -kimmo
> > >
> > >
> > >
> > > From: devel-bounces at lists.sailfishos.org [mailto:devel-bounces at lists.sailfishos.org] On Behalf Of Samuli Silvius
> > > Sent: Wednesday, August 13, 2014 10:07 PM
> > > To: Sailfish OS Developers
> > > Subject: Re: [SailfishDevel] app crashed when using Canvas in Dialog page
> > >
> > >
> > >
> > > Hi,
> > >
> > >
> > >
> > > Sdk produces this dump, cannot really figure out the reason? Or what backtrace you mean?
> > >
> > >
> > >
> > > -Samuli
> > >
> > >
> > >
> > > 2014-08-13 21:50 GMT+03:00 Andrey Kozhevnikov <coderusinbox at gmail.com>:
> > >
> > > try to get backtrace and check what exactly is the reason of crash.
> > >
> > > 14.08.2014 00:49, Samuli Silvius пишет:
> > >
> > > Hi,
> > >
> > >
> > >
> > > I have Canvas in Silica Dialog page but app crashes when leaving dialog page both with accept or cancel swipe. It does not crash always just quite often.
> > >
> > >
> > >
> > > the code:
> > >
> > >         Canvas {
> > >             id: imageCanvas
> > >             visible: isImageUrl
> > >             width: imgLoader.sourceSize.width
> > >             height: imgLoader.sourceSize.height
> > >             renderStrategy: Canvas.Immediate
> > >             onPaint: {
> > >                 var ctx = getContext("2d")
> > >                 ctx.drawImage(imgLoader, 0, 0)
> > >             }
> > >         }
> > >         Image {
> > >             id: imgLoader
> > >             visible: false
> > >             source: isImageUrl ? url : ""
> > >         }
> > > The idea is to save image to the gallery in onAccepted if user has selected that option as Canvas has save method which can be used to save image to a file.
> > >
> > >
> > >
> > > And it works fine, but causing app to crash sometimes when leaving Dialog page with cancel swipe. SDK outputs a long crash dump.
> > >
> > >
> > >
> > > -Samuli
> > >
> > >
> > >
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