QT_SCREEN_SCALE_FACTORS causes CUE marker display misplacement

[mixxxbot]

Reported by: atskler
Date: 2021-02-28T20:31:28Z
Status: Fix Released
Importance: Medium
Launchpad Issue: lp1917253
Attachments: QT_SCREEN_SCALE_FACTORS_AND_CUE_MISPLACEMENT.PDF

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Setting QT_SCREEN_SCALE_FACTORS causes CUE marker display misplacement on waveforms

See on the screenshots in the attached pdf:
QT_SCREEN_SCALE_FACTORS_AND_CUE_MISPLACEMENT.PDF

Mixxx 2.3.0-beta (build 2.3 r8043)
Operating System: openSUSE Tumbleweed 20210220
Qt Version: 5.15.2
Kernel Version: 5.10.16-1-default
Graphics Processor: Mesa DRI Intel® HD Graphics 3000

[mixxxbot]

Commented by: atskler
Date: 2021-02-28T20:31:28Z
Attachments: QT_SCREEN_SCALE_FACTORS_AND_CUE_MISPLACEMENT.PDF

[mixxxbot]

Commented by: atskler
Date: 2021-03-12T21:42:35Z

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Should I re-report this bug under launchpad.net/mixxx/2.3 ?

[mixxxbot]

Commented by: Holzhaus
Date: 2021-03-12T21:53:34Z

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No, I just changed the milestone.

[mixxxbot]

Commented by: ywwg
Date: 2021-03-17T13:59:41Z

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Yeah I've seen this on windows

[mixxxbot]

Commented by: atskler
Date: 2021-06-02T12:10:03Z

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I would like to ask if this bug will be fixed for the 2.3 release?

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T12:41:45Z

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Very unlikely because we're about to release 2.3 atm

[mixxxbot]

Commented by: atskler
Date: 2021-06-02T14:00:06Z

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Important, so please note it is not just the CUE label, but the complete marker is misplaced on the display. If you jump to a cue, mix will jump to it and will play from it, but the marker will not show the correct position.

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I would like to add that this bug – at least for me – is quite frustrating, because on my notebook with its standard resolution everything is too small for using mixxx on a live gig: checking the display from about 80-100 cm distance.

Surely I can work around this problem with decreasing the screen resolution.

I think this feature would be important for others, and this problem can impact and mislead others already using this feature - regarding the displayed and the actual cue position.

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T16:15:50Z

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sorry, my bad, I was confuding the play position with the Cue marker.

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T21:22:35Z

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All waveform markers are affected.
Though there's a difference for text labels and those with icons:
TEXT:

• text area is cropped
• stroke is shifted right
  (the longer the text, the further it's shifted)
• stroke is not painted top to bottom, but stops at
  (top-bottom)/scale factor, so for scale factor of 1.5 it's only
  the upper 2/3 that's painted
  ICON:
• entire icon is painted
• stroke is shifted slightly (about half the icon width in Deere),
  though that differs for the CUE and loop_in icon

A wild guess: somwehere in the marker position calculation there's a rounding issues, and appearantly the scale factor is not considered correctly (incomplete stroke for text labels)

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T22:30:26Z

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the marker text size is not scaled at all...

got it!

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T22:48:04Z

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#3936

[mixxxbot]

Commented by: ronso0
Date: 2021-06-02T22:48:26Z

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okay, that was easier than I though.
please test!

[mixxxbot]

Commented by: atskler
Date: 2021-06-02T22:54:31Z

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Thank you! I will test it once it is merged.

[mixxxbot]

Commented by: ronso0
Date: 2021-06-03T00:53:50Z

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We prefer testing before merging changes ;)
For each PR there are test builds for Linux, Win and mac (artifacts).
see https://github.com/mixxxdj/mixxx/wiki/Testing for details, especially the backup part.

[mixxxbot]

Commented by: ronso0
Date: 2021-06-03T16:30:45Z

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and the fix for pixmap icons
#3938

[mixxxbot]

Commented by: atskler
Date: 2021-06-04T20:10:58Z

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Thank You for fixing this issue for v2.3!

[mixxxbot]

Issue closed with status Fix Released.