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System.NullReferenceException when attempt to Mutate.Draw on a new created Image<L8> #1224
Description
Description
What i'm trying to do: Resize white pixels but keep original image Width & Height
Error: newImage=error CS0103: The name 'newImage' does not exist in the current context
void Resize() is called under a Task
this[layerIndex].Image; // Creates a new Image that loads compressed bytes in
Parallel Loop is executed once, every image instance are new objects created inside the loop (Not shared with other iterations)
Only line "newImage.Mutate(o => o.DrawImage(image, location, 1f));" can trigger the error, Resize operation always pass.
Collection is from 500 to 1000 images but i also tried with just one, same behaviour
This error don't always happens, if i keep redoing same operation sometimes it finish ok without error, others dont.
If i turn Parallel for into a normal for loop problem seens to never happen but of course way slower than using parallel which is what make me use Parallel instead.
System Configuration
- ImageSharp version: 1.0.0-rc0002
- Environment (Operating system, version and so on): Windows 10 v1909
- .NET Framework version: .NET Standard 2.0 library, method called from .NET Framework 4.8 WinForm
Activity
antonfirsov commentedon Jun 10, 2020
@sn4k3 how is the compilation error
CS0103related to the rest of the issue?Any chance you can create a self-contained console app repro? A lot may depend on image sizes, position of
x,yand other contextual factors.sn4k3 commentedon Jun 10, 2020
Repo here: https://github.com/sn4k3/PrusaSL1Viewer
How to reproduce: Execute Main app -> Menu -> Open -> sl1 file from zip. Go to Menu -> Mutators -> Resize -> Pick any value diferent from 100 -> Click ok -> Error happen here
Note the error doesn't always trigger but most of the times will
Void Resize(): https://github.com/sn4k3/PrusaSL1Viewer/blob/master/PrusaSL1Reader/FileFormat.cs#L636
Called at: https://github.com/sn4k3/PrusaSL1Viewer/blob/master/PrusaSL1Viewer/FrmMain.cs#L1893
input_file.zip
JimBobSquarePants commentedon Jun 16, 2020
I think this might be related to #1230 @sn4k3 if you can provide a stack trace that would be really useful.
sn4k3 commentedon Jun 16, 2020
JimBobSquarePants commentedon Jun 16, 2020
@sn4k3 Perfect. Yep, definitely the same issue. I've got #1234 waiting for review to fix this.