Stipple Lost on 2nd Display

[demisjohn]

Some stipples appear to disappear on my 2nd monitor, showing only the outline (frame/line) but no stipple. Dragging window back to primary built-in monitor causes Stipple pattern to reappear.

Versions: 0.27.4 (latest available on native MacOS Big Sur)

Video:

https://user-images.githubusercontent.com/5370181/149563863-32dd12fb-b5ac-4bfd-962f-b2f7ae5ea09b.mov

-- Created a new layout with 2 layers "1/0 2/0", made one Box on each layer, then the video shows result of dragging the window to 2nd display and back. -- You can see box on layer #2 (blue) disappears and reappears. Only vertical outline shows on 2nd display. -- I believe this behavior has been present for years.

[klayoutmatthias]

Thanks for sharing this video.

I think that's a problem of MacOS and maybe with one screen having a (much?) higher resolution than the other. And the screens and drawing is managed by Qt on which I have little influence on.

On Windows or Linux I have not seen such an issue myself yet.

Matthias

[demisjohn]

Can you suggest a project/page on which I should post this issue? Perhaps QT?

[klayoutmatthias]

I don't think the Qt people would look at KLayout code fix the problem.

I'm afraid there is little chance this gets fixed except by chance. Maybe someone with the proper skills and access to the respective hardware can debug and fix the problem. But I don't have the resources to do so myself.

Matthias

[Kazzz-S]

Thanks for the video :-)

Even though I do not usually use a second display, I've just tested and reproduced the issue between the two types of displays below.

Display	Model	Size	Resolution	KLayout & OS	Qt
A	MacBook Pro Retina	13.3"	2560x1600	0.27.7 on Catalina	5.15.2 MacPorts
B	LG E2350	23"	1920x1080	ditto	ditto

More precisely,

• Create a window in A --> move to B --> back to A : the same as the video
• Create a window in B --> move to A --> back to B: the issue not observed

Kazzz-S

[klayoutmatthias]

From what you describe, I assume that some Qt event needs to be processed which tells the application that the main window has been shifted to another display and the image needs to be re-rendered. However, that's a wild guess. I will check if I find any such event on Linux.

[demisjohn]

IN case it helps, to Matthias' point about resolution, here is the info for my displays: Built-In Laptop Color LCD: Display Type: Built-In Retina LCD Resolution: 2560 x 1600 Retina Framebuffer Depth: 24-Bit Color (ARGB8888)

PHL 246V5: Resolution: 1920 x 1080 (1080p FHD - Full High Definition) UI Looks like: 1920 x 1080 @ 60.00Hz Framebuffer Depth: 30-Bit Color (ARGB2101010) Adapter Type: Apple USB-C Digital AV Adapter

Chipset Model: Intel Iris Plus Graphics 650 Type: GPU Bus: Built-In VRAM (Dynamic, Max): 1536 MB Vendor: Intel Device ID: 0x5927 Revision ID: 0x0006 Metal Family: Supported, Metal GPUFamily macOS 2

Thanks all for looking into this.

[stefanottili]

MacBook Air M1 2560x1600 connected to 4k Monitor, display setting to scaled, using // and \\ stipple for the two boxes displays both when created on either display and moved to the other.

[demisjohn]

When \\ stipple is missing on 2nd display (Philips 1920 x 1080), choosing Display > Redraw does not fix it. (/// stipple is drawn correctly)

[stefanottili]

Just to get another datapoint, what happens when you add more layer with different stipple ?

[klayoutmatthias]

0.28 will have better support for high-DPI displays. Maybe that fixes the problem.

[demisjohn]

FYI, this problem recurs even on a brand new display, on a new Acer XZ320Q P, via Belkin AVC008 USB-C--> HMDI dock:

   Resolution:	1920 x 1080 (1080p FHD - Full High Definition)
   UI Looks like:	1920 x 1080 @ 60.00Hz
   Framebuffer Depth:	30-Bit Color (ARGB2101010)
   Display Serial Number:	130107C403W01
   Main Display:	Yes
   Mirror:	Off
   Online:	Yes
   Rotation:	Supported
   Adapter Type:	DVI or HDMI

KLayout version 0.27.11

[stefanottili]

Since Matthias stated “0.28 will have better support for high-DPI displays. Maybe that fixes the problem.”, could you give the latest and greatest a try and report back ?