transparent indexed PNGs are broken in the trunk

Attached is a test image which embeds two PNGs, each containing a 50x50
red square centered on a 100x100 transparent field. The image on the
left is an 8-bit ARGB PNG, while the image on the right is a 1-bit
indexed PNG with a tRNS chunk. This loads correctly in Squiggle in
Batik 1.7, but the right square fails to load in the batik-svn-13-09-01
nightly build.

(I have the same problem with an 8-bit indexed PNG with a tRNS chunk
specifying a single transparent color, which makes me think this is
a general problem afflicting indexed transparent PNGs.)

What's changed since 1.7 to cause this regression?


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