Reviewer needed - new regression test for checking if ImageIO subsystem properly reads PNG images

[Pavel Tisnovsky]

Hi all,

I'd like to add new regression test to IcedTea6 HEAD. This test checks
if ImageIO subsystem can properly read PNG images with various formats.
Such images are tested (pixel-by-pixel) against PAM images I converted
using external tools (these images are included in this change - they
have to be stored in overlays directory and copied in build time to test
directory).

The new test is added through "old" patch file
patches/jtreg-png-reader.patch which already contains two PNG-related
patches I created some time ago.

Here's ChangeLog entry:

2011-06-21  Pavel Tisnovsky  <ptisnovs at redhat.com>

        * patches/jtreg-png-reader.patch:
        Added new regression test which check if PNG
        images read by ImageIO subsytstem contains
        proper pixel values.


Could I push this change to IcedTea6 HEAD please?

Thank you in advance,
Pavel
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