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0ac91cc657
This adds pngcp to the build together with a pngcp.dfa configuration test; the test revealed some configuration bugs which are fixed by corrections to the _SUPPORTED macros. pngcp builds on all tested configurations and a number of bugs have been fixed to make this happen relative to the version in libpng 1.7 contrib/examples. pngcp.dfa will have to be different for 1.7 but pngcp.c should work fine (not yet tested). pngcp itself is still missing a usage message; this is a preliminary version, although since it behaves the same way as 'cp' most unoids shouldn't have a problem using it correctly. Signed-off-by: John Bowler <jbowler@acm.org>
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
# pngcp.dfa
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# Build time configuration of libpng
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#
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# Author: John Bowler
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# Copyright: (c) John Bowler, 2016
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# Usage rights:
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# To the extent possible under law, the author has waived all copyright and
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# related or neighboring rights to this work. This work is published from:
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# United States.
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#
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# Build libpng with support for pngcp. This means just png_read_png,
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# png_write_png and small number of configuration settings.
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#
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everything = off
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# Options to turn on png_read_png and png_write_png:
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option INFO_IMAGE on
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option SEQUENTIAL_READ on
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option EASY_ACCESS on
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option WRITE on
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option WRITE_16BIT on
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option WRITE_FILTER on
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# pngcp needs this to preserve unknown chunks, switching all these on means that
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# pngcp can work without explicit known chunk reading suppport
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option UNKNOWN_CHUNKS on
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option SET_UNKNOWN_CHUNKS on
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option HANDLE_AS_UNKNOWN on
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option SAVE_UNKNOWN_CHUNKS on
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option WRITE_UNKNOWN_CHUNKS on
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# pngcp needs this to handle palette files with invalid indices:
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option CHECK_FOR_INVALID_INDEX on
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option GET_PALETTE_MAX on
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# Pre-libpng 1.7 pngcp has to stash text chunks manually, post 1.7 without this
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# text chunks should be handled as unknown ok.
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option TEXT on
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# this is used to turn off limits:
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option USER_LIMITS on
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option SET_USER_LIMITS on
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# these are are just required for specific customizations
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option WRITE_CUSTOMIZE_ZTXT_COMPRESSION on
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option WRITE_CUSTOMIZE_COMPRESSION on
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