| 1 | # pngcp.dfa
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| 2 | # Build time configuration of libpng
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| 3 | #
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| 4 | # Author: John Bowler
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| 5 | # Copyright: (c) John Bowler, 2016
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| 6 | # Usage rights:
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| 7 | # To the extent possible under law, the author has waived all copyright and
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| 8 | # related or neighboring rights to this work. This work is published from:
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| 9 | # United States.
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| 10 | #
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| 11 | # Build libpng with support for pngcp. This means just png_read_png,
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| 12 | # png_write_png and small number of configuration settings.
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| 13 | #
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| 14 | everything = off
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| 15 |
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| 16 | # This option is specific to this configuration; it adds a #define to the
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| 17 | # generated pnglibconf.h which turns on the (not portable) timing option for
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| 18 | # pngcp. Note that any option is automatically preceded by PNG_; there is no
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| 19 | # way round this and this is deliberate.
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| 20 | option PNGCP_TIMING
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| 21 |
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| 22 | # Because of the everything off above the option must also be turned on. This
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| 23 | # may not be done in one step because it is safer and avoids mis-spelled options
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| 24 | # in user .dfa files to error out if an unrecognized option is turned on.
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| 25 | option PNGCP_TIMING on
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| 26 |
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| 27 | # Options to turn on png_read_png and png_write_png:
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| 28 | option INFO_IMAGE on
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| 29 | option SEQUENTIAL_READ on
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| 30 | option EASY_ACCESS on
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| 31 | option WRITE on
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| 32 | option WRITE_16BIT on
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| 33 | option WRITE_FILTER on
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| 34 |
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| 35 | # pngcp needs this to preserve unknown chunks, switching all these on means that
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| 36 | # pngcp can work without explicit known chunk reading support
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| 37 | option UNKNOWN_CHUNKS on
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| 38 | option SET_UNKNOWN_CHUNKS on
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| 39 | option HANDLE_AS_UNKNOWN on
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| 40 | option SAVE_UNKNOWN_CHUNKS on
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| 41 | option WRITE_UNKNOWN_CHUNKS on
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| 42 |
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| 43 | # pngcp needs this to handle palette files with invalid indices:
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| 44 | option CHECK_FOR_INVALID_INDEX on
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| 45 | option GET_PALETTE_MAX on
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| 46 |
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| 47 | # Pre-libpng 1.7 pngcp has to stash text chunks manually, post 1.7 without this
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| 48 | # text chunks should be handled as unknown ok.
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| 49 | option TEXT on
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| 50 |
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| 51 | # this is used to turn off limits:
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| 52 | option USER_LIMITS on
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| 53 | option SET_USER_LIMITS on
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| 54 |
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| 55 | # these are just required for specific customizations
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| 56 | option WRITE_CUSTOMIZE_ZTXT_COMPRESSION on
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| 57 | option WRITE_CUSTOMIZE_COMPRESSION on
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