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IDProjectCategoryView StatusLast Update
0001197OpenMPTUser Interfacepublic2019-04-14 19:49
ReporterTheRealByteRaver Assigned To 
Status confirmedResolutionopen 
Platformx64OSWindowsOS Version7
Product VersionOpenMPT / libopenmpt 0.4.3 (upgrade first) 
Summary0001197: small bug in sample wave form display after scrolling when max. zoom is active

Vertical lines occur in the graphical representation of the sample data when on maximum zoom-in, after you scroll back-and-forth rapidly.
The screenshot should speak for itself. The artifacts come and go as soon as they go from off-screen to on-screen.
The bug is not isolated to a particular module. I have not tried to reproduce it on different machines.
I use the 32bit version of MPT, on a 64bit Win7 Pro.

Steps To Reproduce
  • In the "Samples" tab, zoom in as much as possible so you get a detailed view of the sample data (each sample point is now separated about 50 pixels from the next one, the display interpolates linearly).
  • move the horizontal scroll bar on the bottom back and forth to reproduce the "problem"
  • artifacts (vertical lines) will occur occasionally


TagsNo tags attached.
Attached Files
sampleDraw.PNG (7,995 bytes)   
sampleDraw.PNG (7,995 bytes)   
Has the bug occurred in previous versions?also in
Tested code revision (in case you know it)




2019-04-14 12:12

administrator   ~0003923

Happens for both SSE2 intrinsics and C++ code paths, release and debug builds.

Saga Musix

Saga Musix

2019-04-14 19:49

administrator   ~0003924

Happens for both SSE2 intrinsics and C++ code paths, release and debug builds.

Yes, it is a known issue with the scrolling code, not the actual waveform drawing.

Issue History

Date Modified Username Field Change
2019-02-16 20:41 TheRealByteRaver New Issue
2019-02-16 20:41 TheRealByteRaver File Added: sampleDraw.PNG
2019-04-14 12:12 manx Status new => confirmed
2019-04-14 12:12 manx Note Added: 0003923
2019-04-14 19:49 Saga Musix Note Added: 0003924