Krita 4.4.3 Plus - Resizing window generate a flickering

Develop Artists Feedback & Testing
#1

Hi,

Don’t know if problem is known or not and if bug on next/plus version can already be reported…

When I resize window, it seems the menubar&status are cropped and/or produce an extra space
This generate a bad flickering effect…

Can’t tell from which build it appeared…
At least, it was already here in following build:

  • Krita 4.4.3 c0196f1
  • Krita 5.0.0 86f9fd1
    (tested appimage on Debian 10)

Can’t produce problem on 4.4.2 appimage (and I don’t remember to got this effect on previous 5.0.0 and 4.4.3 build, but I don’t all of keep :sweat_smile:)

Example of produced effect:

Reading webm file in VLC allows to read frame per frame; here 2 frames where we can see menubar and status suffering:

image
image1552×1121 160 KB

image
image1552×1121 183 KB

Grum999

#2

I see this with the 4.4.2 appimage on Debian 10 (and also the 4.4.3-alpha and 5.0.0-prealpha).

It only happens with vertical resizing and it only happens if there’s an image open.
It doesn’t happen if canvas graphics acceleration is turned off.

OpenGL Info

Vendor: “NVIDIA Corporation”
Renderer: “GeForce GTX 750 Ti/PCIe/SSE2”
Version: “4.6.0 NVIDIA 450.80.02”
Shading language: “4.60 NVIDIA”
Requested format: QSurfaceFormat(version 3.0, options QFlagsQSurfaceFormat::FormatOption(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile)
Current format: QSurfaceFormat(version 4.6, options QFlagsQSurfaceFormat::FormatOption(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile)
Version: 4.6
Supports deprecated functions true
is OpenGL ES: false

QPA OpenGL Detection Info
supportsDesktopGL: true
supportsOpenGLES: true
isQtPreferOpenGLES: false

If you have a more powerful graphics card than me, maybe the more recent builds are putting more stress on the GPU?

#3

You’re right
I’m confused, I don’t know how I missed this :flushed:
Just tested all version I have, problem is already here from 4.1.7

If nobody noticed it before, it might not be such a disturbing problem :sweat_smile:

Yes and no :crazy_face:

The problem is not the same, but you can see a very strange string in window title bar: it stretched horizontally or vertically according to resize action…


This also occurs when no document is opened (but that’s barely noticeable)
But I can’t say if it’s related or not… :thinking:

But it’s right that with graphic acceleration off, the big flickering effect is not here anymore…

My GC is strong enough to support many more than a window resizing :slight_smile:

Vendor: “NVIDIA Corporation”
Renderer: “GeForce GTX 1060 3GB/PCIe/SSE2”
Version: “4.6.0 NVIDIA 418.181.07”
Shading language: “4.60 NVIDIA”
Requested format: QSurfaceFormat(version 2.0, options QFlagsQSurfaceFormat::FormatOption(), depthBufferSize -1, redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize -1, samples -1, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 1, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::NoProfile)
Current format: QSurfaceFormat(version 4.6, options QFlagsQSurfaceFormat::FormatOption(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0, stencilBufferSize 0, samples -1, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 1, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile)
Version: 4.6
Supports deprecated functions true
is OpenGL ES: false

I have a doubt that is stressing the GPU…

On my laptop, with a less powerfull GC, problem is the same

Vendor: “Intel Open Source Technology Center”
Renderer: "Mesa DRI Intel® HD Graphics 520 (Skylake GT2) "
Version: “3.0 Mesa 18.3.6”
Shading language: “1.30”
Requested format: QSurfaceFormat(version 3.0, options QFlagsQSurfaceFormat::FormatOption(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile)
Current format: QSurfaceFormat(version 3.0, options QFlagsQSurfaceFormat::FormatOption(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::NoProfile)
Version: 3.0
Supports deprecated functions true
is OpenGL ES: false

Grum999

#4

I just tested some other Qt application, I got the same problem with title bar.
I’m pretty sure that if appliciation was using graphic acceleration the same flickering problem will occurs.

So it seems to be a Qt bug, don’t think that Krita’s team can do anything on it…

Grum999

#5

The thought that later builds were stressing the GPU was based on your initial statemement that you didn’t see it on 4.4.2.
So that’s my nice theory shot down :slight_smile:

Also, from a practical and pragmatic point of view, it only happens with a quite rare event and doesn’t affect normal use.
If it is a Qt bug then that’s the thing - nothing to do but tell them, which has it’s own problems and complications.

#6

I didn’t see it on all Qt application running on my Debian… :dizzy_face: and yet I have …
Don’t know why today I’m seeing this…

Yes, I don’t resize windows all the time, they are often (almost always) in maximized state…

So nothing to do for this.

Thanks for time passed on this subject, at least I know that’s not a Krita’s relative problem :slight_smile:

Grum999

1 Like