Pharo Issue Tracker - Manuscript (Case [Issue]21927) Graphics - Figure out why PNGReadWriter does not pass a full test suite

Manuscript Notification

	Sven Van Caekenberghe opened Case 21927: Figure out why PNGReadWriter does not pass a full test suite and assigned it to Everyone: Enhancement in Graphics: 1. Pharo Image • You are subscribed to this case

There is an interesting PNG test suite available at http://www.schaik.com/pngsuite2011/pngsuite.html

In particular the following archive http://www.schaik.com/pngsuite2011/PngSuite-2017jul19.tgz or http://www.schaik.com/pngsuite2011/PngSuite-2017jul19.zip contains 174 test PNG files.

You can browse/preview them by GT inspecting

<code>
FileLocator desktop / 'PngSuite'
</code>

As can be seen from the following test

<code>
(((FileLocator desktop / 'PngSuite') filesMatching: '*.png')
collect: [ :each |
each -> ([ PNGReadWriter formFromFileNamed: each ] on: Error do: [ ]) ])
select: [ :x | x value isNil ]
</code>

14 files result in an error.

It would be good to figure out why and if anything needs to be done about it.

	Priority: 4 – Would be nice		Status: Work Needed
	Assigned to: Everyone		Milestone: Pharo7.0

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