[SailfishDevel] app crashed when using Canvas in Dialog page

[Gunnar Sletta]

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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