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58 lines
2 KiB
Text
58 lines
2 KiB
Text
# read.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, 2013
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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 basic read support. This enables the lowest level libpng
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# read API - the one where the calling code has to use a loop to read each row.
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# At present this is the API used by most programs.
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#
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# Support is enabled only for those chunks and transformations that are
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# typically required - others can be added easily.
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#
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everything = off
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# The sequential read code is enabled here; the progressive code can be used
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# instead but there is no point enabling both.
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option SEQUENTIAL_READ on
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# Likewise it is pointless enabling both fixed and floating point APIs. Choose
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# one or the other for both the API and the internal math.
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#Fixed point:
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#option FIXED_POINT on
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#option FLOATING_ARITHMETIC off
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#Floating point:
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option FLOATING_POINT on
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option FLOATING_ARITHMETIC on
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# Basic error handling, IO and user memory support. The latter allows the
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# application program to provide its own implementations of 'malloc' and 'free'.
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option SETJMP on
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option STDIO on
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option USER_MEM on
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# To read the full set of PNG images correctly interlace, transparency and
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# 16-bit support is required. The application can implement interlace itself,
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# but very few do and it's no longer possible to disable it when READ is
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# enabled.
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option READ_tRNS on
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option READ_16BIT on
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# Everything else is application dependent. This file assumes the app handles
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# all the native PNG bit layouts, so it doesn't need any of layout change
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# transforms, but needs libpng to perform gamma correction. It doesn't do any
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# colorspace stuff and ignores the 'significant bit' information.
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#
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# If your app always expands the image to a limited set of bit layouts you
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# probably want to consider using the simplified API instead of the low level
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# one - see png.h and s_read.dfa.
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option READ_GAMMA on
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