update libpng

update libpng, the repo now requires a vcpkg setup for integrating but skipping the install step should allow it to work for windows an linux, mac might need more

Engine/lib/lpng/contrib/conftest/basic.dfa

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+# basic.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2024
+# 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 basic read and write support.  This enables the lowest
+# level libpng read and write APIs - the "row-by-row" ones.
+#
+# Support is enabled only for those transformations that are observed to be
+# required by widely used apps or are in the v3 specification.
+#
+
+everything = off
+
+# The sequential read code is enabled here; the progressive code can be used
+# instead but there is no point enabling both.
+
+option READ on
+option SEQUENTIAL_READ on
+option EASY_ACCESS on
+option SET_USER_LIMITS on
+option INFO_IMAGE on
+option READ_16BIT on
+
+# Errors: these can be disabled but then there won't be any error messages
+# just failures and the error messages are really needed for apps:
+option WARNINGS on
+option ERROR_TEXT on
+option BENIGN_READ_ERRORS on
+
+# Required for many display programs such as web browsers:
+option PROGRESSIVE_READ on
+
+# Switch on the write code - this makes a minimalist encoder but with
+# interlace support turned on; otherwise png_read_png..png_write_png will
+# fail on an interlaced image.
+option WRITE on
+option WRITE_INTERLACING on
+option WRITE_16BIT on
+
+# Usages of the 'fixed' APIs are relatively rare but they do occur
+# one or the other for both the API and the internal math.
+
+#Fixed point:
+option FIXED_POINT on
+
+#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
+
+# Gamma handling: this needs to be on for the gamma handling
+option READ_GAMMA on
+
+# The supported chunks
+chunk bKGD on
+chunk cHRM on
+chunk eXIf on
+chunk gAMA on
+chunk iCCP on
+chunk iTXt on
+chunk pHYs on
+chunk sBIT on
+chunk sRGB on
+chunk tEXt on
+chunk tIME on
+chunk tRNS on
+chunk zTXt on
+
+# These don't seem to be used anywhere:
+# chunk pCAL
+# chunk sCAL
+# chunk sPLT
+
+# The rest of this is app dependent: none of these options are required for
+# read/write of the full range of PNG files and the normal chunk handling on
+# read.
+option WRITE_CUSTOMIZE_ZTXT_COMPRESSION on
+option WRITE_CUSTOMIZE_COMPRESSION on
+
+option READ_EXPAND on
+option READ_FILLER on
+option READ_GRAY_TO_RGB on
+option READ_INVERT on
+option READ_PACK on
+option READ_RGB_TO_GRAY on
+option READ_SCALE_16_TO_8 on
+option READ_SHIFT on
+option READ_STRIP_16_TO_8 on
+option READ_STRIP_ALPHA on
+option READ_SWAP on
+
+option CONVERT_tIME on
+
+# optipng
+option IO_STATE on
+option STORE_UNKNOWN_CHUNKS on
+option HANDLE_AS_UNKNOWN on
+
+# pngcrush
+option READ_USER_TRANSFORM on
+option WRITE_FLUSH on
+
+# pnmtopng
+chunk hIST on
+
+# cairo
+option WRITE_PACKSWAP on
+option WRITE_USER_TRANSFORM on
+
+# graphicsmagick
+option READ_USER_CHUNKS on
+
+# Qt5.15 qtgui (gentoo package split) Qt6.6 qtbase
+option READ_BGR on
+option WRITE_BGR on
+option READ_SWAP_ALPHA on
+option WRITE_SWAP_ALPHA on
+chunk oFFs on
+
+# ghostscript-gpl
+option WRITE_INVERT_ALPHA on
+option WRITE_INVERT on

Engine/lib/lpng/contrib/conftest/fixed.dfa

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+# fixed.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+# 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.
+#
+# Test the standard libpng configuration without floating point (the internal
+# fixed point implementations are used instead).
+#
+option FLOATING_ARITHMETIC off
+option FLOATING_POINT off

Engine/lib/lpng/contrib/conftest/float-fixed.dfa

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+# fixed-float.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+# 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.
+#
+# Test the standard libpng configuration with the fixed point internal
+# implementation in place of the default floating point
+#
+option FLOATING_ARITHMETIC off

Engine/lib/lpng/contrib/conftest/nocompile-limits.dfa

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+# nolimits.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+#
+# 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 without any limits and without run-time settable limits.  Turning
+# USER_LIMITS off reduces libpng code size by allowing compile-time elimination
+# of some checking code.
+#
+option USER_LIMITS off
+
+@# define PNG_USER_WIDTH_MAX PNG_UINT_31_MAX
+@# define PNG_USER_HEIGHT_MAX PNG_UINT_31_MAX
+@# define PNG_USER_CHUNK_CACHE_MAX 0
+@# define PNG_USER_CHUNK_MALLOC_MAX 0

Engine/lib/lpng/contrib/conftest/nolimits.dfa

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+# nolimits.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+#
+# 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 without any limits.  With these settigs run-time limits are still
+# possible.
+#
+@# define PNG_USER_WIDTH_MAX PNG_UINT_31_MAX
+@# define PNG_USER_HEIGHT_MAX PNG_UINT_31_MAX
+@# define PNG_USER_CHUNK_CACHE_MAX 0
+@# define PNG_USER_CHUNK_MALLOC_MAX 0
+

Engine/lib/lpng/contrib/conftest/read-full.dfa

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+# read-full.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+# 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 write support and full read support.
+#
+option WRITE off

Engine/lib/lpng/contrib/conftest/write-full.dfa

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+# write-full.dfa
+#  Build time configuration of libpng
+#
+# Author: John Bowler
+# Copyright: (c) John Bowler, 2025
+# 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 full write support.
+#
+option READ off