Kurt,
A quick and dirty test of running...
cd autotest/gdrivers
/sw/bin/optipng data/test.png
OptiPNG 0.6.3: Advanced PNG optimizer.
Copyright (C) 2001-2009 Cosmin Truta.
** Processing: data/test.png
400x400 pixels, 8 bits/pixel, 16 colors (16 transparent) in palette
Reducing image to 2 bits/pixel, 4 colors (1 transparent) in palette
Input IDAT size = 8575 bytes
Input file size = 8732 bytes
Trying:
zc = 9 zm = 8 zs = 0 f = 0 IDAT size = 6721
zc = 9 zm = 8 zs = 1 f = 0 IDAT size = 6428
Selecting parameters:
zc = 9 zm = 8 zs = 1 f = 0 IDAT size = 6428
Output IDAT size = 6428 bytes (2147 bytes decrease)
Output file size = 6522 bytes (2210 bytes = 25.31% decrease)
eliminates the "IDAT: invalid distance too far back" failures as described
in https://github.com/licq-im/licq/pull/32...
% ./png.py
TEST: png_1 ... success
TEST: png_2 ... success
TEST: png_3 ... fail
line 66: Wrong colormap entries
TEST: png_4 ... success
TEST: png_5 ... success
TEST: png_6 ... success
TEST: png_7 ... success
TEST: png_8 ... success
TEST: png_9 ... success
TEST: png_10 ... success
TEST: png_11 ... success
Test Script: png
Succeeded: 10
Failed: 1 (0 blew exceptions)
Skipped: 0
Expected fail:0
Duration: 0.09s
I suspect we need to use finer control on the options passed to /sw/bin/optipng
to avoid changing the colormap entries. In any case, I think this pretty much
proves my hypothesis that these failures in png.py are false positives.
Jack
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