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#
# PNG library CMake configuration for the Fast Light Toolkit (FLTK).
#
# Copyright 1998-2024 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
)
#######################################################################
# Note: This file is used only if we build the bundled PNG library,
# and if we do this we MUST also build and use the *bundled* ZLIB,
# hence we also link against the bundled ZLIB. Therefore there's
# no need to check which ZLIB version to use in this context.
#######################################################################
#######################################################################
# 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 some files on ppc64.
# We compile these files whatever the architecture resulting in
# void code on non-ppc64 architectures.
#######################################################################
list(APPEND PNG_SRCS
powerpc/powerpc_init.c
powerpc/filter_vsx_intrinsics.c
)
#######################################################################
# Set common variables for static and shared builds
#######################################################################
set(compile_defs
HAVE_PNG_H=1
HAVE_PNG_GET_VALID=1
HAVE_PNG_SET_TRNS_TO_ALPHA=1
)
set(include_dirs
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
$<INSTALL_INTERFACE:include>
)
#######################################################################
# Build the static library
#######################################################################
fl_add_library(fltk_png STATIC "${PNG_SRCS}")
set(target fltk_png)
target_link_libraries (${target} PUBLIC fltk::z)
target_compile_definitions(${target} PUBLIC ${compile_defs})
target_include_directories(${target} PUBLIC ${include_dirs})
list(APPEND FLTK_IMAGE_LIBRARIES fltk::png)
# Propagate to parent scope (modified by fl_add_library and here)
set(FLTK_LIBRARIES ${FLTK_LIBRARIES} PARENT_SCOPE)
set(FLTK_IMAGE_LIBRARIES ${FLTK_IMAGE_LIBRARIES} PARENT_SCOPE)
#######################################################################
# Build the shared library (optional)
#######################################################################
if(FLTK_BUILD_SHARED_LIBS)
# ensure to export all symbols for Windows DLL's
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
fl_add_library(fltk_png SHARED "${PNG_SRCS}")
set(target fltk_png-shared)
target_link_libraries (${target} PUBLIC fltk::z-shared)
target_compile_definitions(${target} PUBLIC ${compile_defs})
target_include_directories(${target} PUBLIC ${include_dirs})
list(APPEND FLTK_IMAGE_LIBRARIES_SHARED fltk::png-shared)
# Propagate to parent scope (modified by fl_add_library and here)
set(FLTK_LIBRARIES_SHARED ${FLTK_LIBRARIES_SHARED} PARENT_SCOPE)
set(FLTK_IMAGE_LIBRARIES_SHARED ${FLTK_IMAGE_LIBRARIES_SHARED} PARENT_SCOPE)
endif()
#######################################################################
# Install the library headers
#######################################################################
install(FILES png.h pngconf.h pnglibconf.h pngprefix.h
DESTINATION ${FLTK_INCLUDEDIR}/FL/images
)
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