[Cuis-dev] VectorGrahicsPlugin Troubles (WAS: Re: A few tweaks to preferences)

[Gerald Klix]

On 8/21/21 7:54 PM, Juan Vuletich via Cuis-dev wrote:
> Thanks Gerald!
> 
> Luckily, in this case, the crash.dmp pointed straight to a clear bug in 
> the code. 
That's a big relief! I feared that this spurious crashes
would lead to a tedious sequence/tree of trials and errors,
sending E-Mails back and forth.
> In most other cases, any primitive that modifies an array also 
> gets the array as argument (even if passed before). This is in case the 
> GC moves it around. But when I added contour, somehow I forgot about 
> this. #primResetContourTop:bottom: doesn't pass the contour array as 
> argument, and therefore could produce an invalid access after GC.I am still hopeful that I can withstand the temptation to start
VM development ... Thanks for the information.
> 
> This will require changes to the plugin and new VMs.
Of course. Just send me a message than I will rebuild the VMs.
> 
> I'll be working on this in the next few days. Please stay tuned.
While you are at it, any chance to get 
VectorDrawingCanvas>>image:multipliedBy:at:
implemented or should I wait until we have a proper
vector icon set?
Background information: Menus and my nice PlugableButtonMorphs
do not scale anymore, because they have icons implemented as Forms.

As a workaround is there a chance to force some morphs
to be drawn by a BitBlit canvas, doing the transformations
as image scaling (The ugly old Squeak way)?


Best Regards,

Gerald

> 
> Thanks,
> 
> On 8/21/2021 2:24 PM, Gerald Klix via Cuis-dev wrote:
>> Alas I had another SegFault, that happened after a 2h pause
>> after testing your changes, I wanted to change the screen size
>> in Haver (with no background image).
>>
>> I attached the crash.dmp-file. It is probably not that helpful,
>> I stripped the VM and its plugins.
>>
>>
>> HTH,
>>
>> Gerald
>>
>>
>>
>> On 8/21/21 7:18 PM, Juan Vuletich via Cuis-dev wrote:
>>> On 8/20/2021 11:56 PM, Phil B via Cuis-dev wrote:
>>>> Juan,
>>>>
>>>> On Fri, Aug 20, 2021 at 10:34 PM Juan Vuletich via Cuis-dev 
>>>> <cuis-dev at lists.cuis.st <mailto:cuis-dev at lists.cuis.st>> wrote:
>>>>
>>>>     Thanks Gerald. I have experienced occasional crashes when zooming
>>>>     heavy
>>>>     windows, but this surely makes it more likely to happen. I can't
>>>>     test it
>>>>     right now (I need Windows or Linux), but I thought of a possible
>>>>     reason
>>>>     for the problem. If many drag-the-scale-handle events are
>>>>     processed in
>>>>     the same Morphic cycle, and processing each takes too much time, 
>>>> next
>>>>     cycle will take longer, so it will process even more of those
>>>>     events (if
>>>>     generated at a constant rate by an insisting user). The growth is
>>>>     exponential, with no bound. So this is guaranteed to end badly!
>>>>
>>>>
>>>> Yes, this can be an issue with non-VG Morphic too if one isn't 
>>>> careful.  I've run into it with everything from scrolling to mouse 
>>>> moves to dragging etc.  VG likely just makes it a more frequent 
>>>> issue given the overhead of the increased drawing time per frame.
>>>>
>>>>
>>>>     I just pushed an update that limits the processing of
>>>>     MouseMoveEvents to
>>>>     just one per cycle. The other kinds of events are much less 
>>>> likely to
>>>>     cause this kind of problems (although not completely 
>>>> impossible), and
>>>>     are (as usual) processed until the event queue is empty.
>>>>
>>>>
>>>> Please don't discard events like this.  It will have an impact on 
>>>> sensitivity/resolution which is already not great.  Can we do some 
>>>> combination of coalescing and/or more selectively discarding them 
>>>> instead?
>>>
>>> The point is to improve sensitivity to user actions. Slowing down the 
>>> Morphic cycle, reducing fps, to process events that won't give 
>>> feedback to the user until the next cycle is what makes it worse. The 
>>> way to improve is to give the user feedback as quickly as possible.
>>>
>>>>
>>>>
>>>>     Please try again with this updates if you have the chance. It may
>>>>     help.
>>>>
>>>>     Thanks,
>>>>
>>>>     --     Juan Vuletich
>>>>     www.cuis-smalltalk.org <http://www.cuis-smalltalk.org>
>>>>     https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
>>>>     https://github.com/jvuletich
>>>>     https://www.linkedin.com/in/juan-vuletich-75611b3
>>>>     @JuanVuletich
>>>>
>>>>
>>>> Thanks,
>>>> Phil
>>>
>>>
>>>
> 
>