> Is it possible that I've just missed some preprocessor
flag somewhere? Does
> libpng work properly on the PowerPC?
Yup, at least older releases. It's possible a bug got
introduced into
a newer one.
You could also try pngcheck with zlib support. Version 2
tests IDATs
regardless of the verbosity level, and the PNG-parsing part
is completely
independent of libpng.
That said, pngcheck reports no issues with the two you
posted, so that's
independent verification that the images and zlib are
working OK:
% pngcheck -vv I*png
File: IDATCRCError.png (51497 bytes)
chunk IHDR at offset 0x0000c, length 13
400 x 300 image, 24-bit RGB, non-interlaced
chunk gAMA at offset 0x00025, length 4: 0.45000
chunk tEXt at offset 0x00035, length 25, keyword:
Software
chunk IDAT at offset 0x0005a, length 51387
zlib: deflated, 32K window, maximum compression
zlib line filters (0 none, 1 sub, 2 up, 3 avg, 4
paeth):
1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 4 4 4 4 4
4 4 4 4 4 1 1 4 1 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3
3 3 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 3
3 3 3 3 3 3 3 4 4 4 4 4 4 4 3 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 4 4 4 4 4 2 4 2 4 4 4 4 4 4 4 4 4 4 4 4
4 4 4 4 4 4 4 4 4 4 4 3 4 4 3 4 3 3 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 4 1 4 4 4 4 4 4 4 1 1 4 2
(300 out of 300)
chunk IEND at offset 0x0c921, length 0
No errors detected in IDATCRCError.png (5 chunks, 85.7%
compression).
File: InvalidLiteralLengthsError.png (1305528 bytes)
chunk IHDR at offset 0x0000c, length 13
800 x 600 image, 24-bit RGB, non-interlaced
chunk gAMA at offset 0x00025, length 4: 0.45000
chunk tEXt at offset 0x00035, length 25, keyword:
Software
chunk IDAT at offset 0x0005a, length 1305418
zlib: deflated, 32K window, maximum compression
zlib line filters (0 none, 1 sub, 2 up, 3 avg, 4
paeth):
4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
(600 out of 600)
chunk IEND at offset 0x13ebb0, length 0
No errors detected in InvalidLiteralLengthsError.png (5
chunks, 9.3% compression).
No errors were detected in the 2 files tested.
> I'm using the exact same loading code
> with the same images on a Windows x86 machine, and
having no problems.
What compiler? If you're using MSVC, be aware that it
(reportedly) does
some things to make nominally invalid code work OK; the one
that comes to
mind is zeroing out malloc'd memory, but there were others.
(You could
try running your PPC app under valgrind, assuming you have a
Unix-like OS;
it does a pretty good job of catching memory-related
problems.)
Other than that, it's possible the pngconf.h big-endian flag
has something
to do with it, but I'm speculating... You could use either
pngtest or
rpng/rpng2 to check whether it's a libpng issue or an app
issue.
Greg
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