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[RaiMan <sikulix@xxxxxxxxxxx>]

It has nothing to do with the used image.

It is a problem with the screenshot taken from regionArrows, when trying
to convert the shot's BufferedImage into an OpenCV Mat object as base
for the search.

This might be caused internally by some image buffer access problems due
to timing (buffer not yet completely filled on the Java image side, but
already accessed by the OpenCV Mat logic).

This normally does not make problems, but might do so in overload
situations.

I have not implemented any checks on such possible race situations.

I keep this as a bug with low prio to be watched

** Changed in: sikuli
       Status: New => In Progress

** Changed in: sikuli
   Importance: Undecided => Medium

** Changed in: sikuli
     Assignee: (unassigned) => RaiMan (raimund-hocke)

** Changed in: sikuli
    Milestone: None => 1.1.4

** Summary changed:

- intermittent error j < nsrcs && src[j].depth() == depth
+ [1.1.4] OpenCV: BufferedImage to Mat:  intermittent error j < nsrcs && src[j].depth() == depth

** Summary changed:

- [1.1.4] OpenCV: BufferedImage to Mat:  intermittent error j < nsrcs && src[j].depth() == depth
+ [1.1.4] OpenCV: ScreenShot BufferedImage to Mat:  intermittent error j < nsrcs && src[j].depth() == depth

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https://bugs.launchpad.net/bugs/1817962

Title:
  [1.1.4] OpenCV: ScreenShot BufferedImage to Mat:  intermittent error j
  < nsrcs && src[j].depth() == depth

Status in Sikuli:
  In Progress

Bug description:
  I am trying to figure out this intermittent error that sometimes shows
  up after the script has run for some time:

  [error (27/02/2019, 17:38:38)] Error caused by: Traceback (most recent call last):
    File "C:\SikuliX\project.sikuli\project.py", line 884, in <module>
      lookForExit()
    File "C:\SikuliX\project.sikuli\project.py", line 822, in lookForExit
      if regionArrows.exists(arrRB,0.5) and Dir == "L":
  ]
  	at org.opencv.core.Core.mixChannels_0(Native Method)
  	at org.opencv.core.Core.mixChannels(Core.java:1740)
  	at org.sikuli.script.Finder2.makeMat(Finder2.java:494)
  	at org.sikuli.script.Finder2.makeMat(Finder2.java:477)
  	at org.sikuli.script.Finder.setScreenImage(Finder.java:144)
  	at org.sikuli.script.Finder.initScreenFinder(Finder.java:139)
  	at org.sikuli.script.Finder.<init>(Finder.java:124)
  	at org.sikuli.script.Region.doCheckLastSeenAndCreateFinder(Region.java:2938)
  	at org.sikuli.script.Region.checkLastSeenAndCreateFinder(Region.java:2899)
  	at org.sikuli.script.Region.doFind(Region.java:2846)
  	at org.sikuli.script.Region.access$300(Region.java:21)
  	at org.sikuli.script.Region$RepeatableFind.run(Region.java:3109)
  	at org.sikuli.script.Region$Repeatable.repeat(Region.java:3060)
  	at org.sikuli.script.Region.exists(Region.java:2376)
  	at jdk.internal.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
  org.opencv.core.CvException: CvException [org.opencv.core.CvException: cv::Exception: OpenCV(3.4.2) C:\build\3_4_winpack-bindings-win64-vc14-static\opencv\modules\core\src\channels.cpp:128: error: (-215:Assertion failed) j < nsrcs && src[j].depth() == depth in function 'cv::mixChannels'
  ]

  This is running on Windows 7 64 bit
  Standard SikuliX installation on 1.1.4 latest nightly build. No custom libraries or any fancy stuff. The "C:\build" does not exist on this machine, but not sure if that is a problem, it just refers to the original source file pre-compilation perhaps?

  I've attached the image file thats being used in that search function.
  Note that it was saved as PNG using Paint after it was cropped from
  the original SikuliX captured file.

  I don't see any other correlations with something else happening at
  the time these errors are thrown. They seem fairly random to me.

  Initial research suggest something to do with OpenCV mixChannels not
  accepting the particular image format/colour depth or so on. But It
  could be because something else of course?

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