PicLayer: memory issue with a transparent image

[richlv]

What steps will reproduce the problem?

1. Open the attached PNG in some image editing/viewing software that allows to copy it. Copy it to clipboard.
2. Download a small piece of data around ​https://www.openstreetmap.org/#map=19/58.38255/26.72458&layers=N .
3. Imagery -> PicLayer from clipboard.
4. Hide data layer, Pan around a bit, zoom in to some image area.

What is the expected result?

Handles the image.

What happens instead?

Error "JOSM is out of memory. Strange things may happen".

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-04-01 23:17:01 +0200 (Thu, 01 Apr 2021)
Build-Date:2021-04-01 21:46:03
Revision:17702
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17702 en_GB) Mac OS X 10.15.7
OS Build number: Mac OS X 10.15.7 (19H524)
Memory Usage: 1934 MB / 1934 MB (1669 MB allocated, but free)
Java version: 1.8.0_281-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.apple.laf.AquaLookAndFeel
Screen: Display 1127230987 1920×1080 (scaling 1.00×1.00) Display 69733382 1680×1050 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→16×16, 32×32→32×32
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
VM arguments: [-Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlp.tk=awt, -Djnlpx.jvm=<java.home>/bin/java, -Djnlpx.splashport=-1, -Djnlpx.home=<java.home>/bin, -Djnlpx.remove=false, -Djnlpx.offline=false, -Djnlpx.relaunch=true, -Djnlpx.session.data=/var/folders/nl/flqxqsmj5q963r7tcnfrdt3c0000gn/T/session1370607577612292195, -Djnlpx.heapsize=-1,2147483648, -Djava.security.policy=file:<java.home>/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.origFilenameArg=/Users/richlv/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-72e8e992, -Dsun.awt.warmup=true, -Djava.security.manager]
Dataset consistency test: No problems found

Plugins:
+ InfoMode (35543)
+ Mapillary (1.5.37.6)
+ PicLayer (2a9aa7a)
+ apache-commons (35524)
+ apache-http (35589)
+ ejml (35458)
+ geotools (35458)
+ imagery_offset_db (35640)
+ javafx-osx (35655)
+ jaxb (35543)
+ jna (35662)
+ jts (35458)
+ measurement (35640)
+ opendata (35640)
+ pbf (35720)
+ photo_geotagging (35715)
+ reverter (35688)
+ utilsplugin2 (35691)

Map paint styles:
+ /Users/richlv/Desktop/ChangeFontSize.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1

Last errors/warnings:
- 00369.488 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00369.907 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00370.444 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00370.854 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00371.137 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00371.577 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00371.901 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00372.308 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00372.603 E: Handled by bug report queue: java.lang.OutOfMemoryError: Java heap space
- 00372.604 W: Too many errors. Dropping ReportedException [thread=Thread[AWT-EventQueue-2,6,javawsApplicationThreadGroup], exception=java.lang.OutOfMemoryError: Java heap space, methodWarningFrom=BugReportExceptionHandler#handleException]

[richlv]

Testcase image

[rebsc]

Tried it on windows but could not reproduce the bug. I guess this is not a PicLayer issue. Please have a look at #20641, the comments might help you solving the problem.

duplicate of #20641?