John Bowler c5bef946b1 [devel] IDAT compression failed if preceded by a compressed text chunk ...

This was because the attempt to reset the zlib stream in png_write_IDAT
happened after the first IDAT chunk had been deflated - much too late.
In this change internal functions are added to claim/release the z_stream
and, hopefully, make the code more robust.  Also deflateEnd checking is
added - previously libpng would ignore an error at the end of the stream.

2011-05-05 17:35:39 -05:00

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