Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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# write.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with no read support and minimal write support.
#
everything = off
# Switch on the write code - this makes a minimalist encoder
option WRITE on
# Choose fixed or floating point APIs and arithmetic. The choices are
# independent but normally they will match. It is typically better to use the
# floating point if you have floating point hardware. If you don't know, or
# (perhaps) to make libpng smaller used fixed point throughout.
#Fixed point:
#option FIXED_POINT on
#option FLOATING_ARITHMETIC off
#Floating point:
option FLOATING_POINT on
option FLOATING_ARITHMETIC on
# Basic error handling, IO and user memory support. The latter allows the
# application program to provide its own implementations of 'malloc' and 'free'.
option SETJMP on
option STDIO on
option USER_MEM on
# Everything else is optional. Unlike the read code in libpng the write code
# does not need to deal with arbitrary formats, so only add support for things
# you really do write! For example you might only write sRGB images, sometimes
# with transparency and never write 16 bit images, so:
option WRITE_sRGB on
option WRITE_tRNS on
#option WRITE_16BIT off (this is the default with 'everything = off')