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#
# PNG library CMake configuration for the Fast Light Toolkit (FLTK).
#
# Copyright 1998-2022 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file. If this
# file is missing or damaged, see the license at:
#
# https://www.fltk.org/COPYING.php
#
# Please see the following page on how to report bugs and issues:
#
# https://www.fltk.org/bugs.php
#
# source files for png
set(PNG_SRCS
png.c
pngerror.c
pngget.c
pngmem.c
pngpread.c
pngread.c
pngrio.c
pngrtran.c
pngrutil.c
pngset.c
pngtrans.c
pngwio.c
pngwrite.c
pngwtran.c
pngwutil.c
)
#######################################################################
# Build some files on ARM (e.g. Apple M1 systems)
#######################################################################
# We can only determine the target architecture if it is set
# in CMAKE_OSX_ARCHITECTURES, otherwise we *assume* it is true and
# compile these files even if this results in some warnings.
# This includes all non-macOS platforms.
if (CMAKE_OSX_ARCHITECTURES)
string(REGEX MATCH "arm64" is_arm "${CMAKE_OSX_ARCHITECTURES}")
else ()
set (is_arm TRUE)
endif ()
if (is_arm)
LIST (APPEND PNG_SRCS
arm/arm_init.c
arm/filter_neon_intrinsics.c
arm/palette_neon_intrinsics.c
)
endif ()
unset (is_arm)
#######################################################################
# Build the static library
#######################################################################
FL_ADD_LIBRARY (fltk_png STATIC "${PNG_SRCS}")
target_link_libraries (fltk_png ${FLTK_ZLIB_LIBRARIES})
#######################################################################
# Build the shared library (optional)
#######################################################################
if (OPTION_BUILD_SHARED_LIBS)
FL_ADD_LIBRARY (fltk_png SHARED "${PNG_SRCS}")
if (FLTK_USE_BUILTIN_ZLIB)
target_link_libraries (fltk_png_SHARED fltk_z_SHARED)
else()
target_link_libraries (fltk_png_SHARED ${FLTK_ZLIB_LIBRARIES})
endif ()
endif ()
#######################################################################
# Install the library headers
#######################################################################
install (FILES png.h pngconf.h pnglibconf.h pngprefix.h
DESTINATION ${FLTK_INCLUDEDIR}/FL/images
)
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