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function(projt_add_libpng)
# Ensure libpng install rules are enabled even if other deps toggled them.
set(SKIP_INSTALL_ALL OFF CACHE BOOL "" FORCE)
set(SKIP_INSTALL_LIBRARIES OFF CACHE BOOL "" FORCE)
set(PNG_SHARED ON CACHE BOOL "" FORCE)
set(PNG_STATIC OFF CACHE BOOL "" FORCE)
# Avoid loading both libpng16d and system libpng16 in Debug builds.
set(PNG_DEBUG_POSTFIX "" CACHE STRING "" FORCE)
set(PNG_TESTS OFF CACHE BOOL "" FORCE)
set(PNG_TOOLS OFF CACHE BOOL "" FORCE)
set(PNG_EXECUTABLES OFF CACHE BOOL "" FORCE)
if(UNIX AND NOT APPLE)
if(DEFINED Launcher_BUNDLED_LIBDIR AND NOT Launcher_BUNDLED_LIBDIR STREQUAL "")
projt_push_install_libdir("${Launcher_BUNDLED_LIBDIR}")
endif()
if(DEFINED Launcher_BUNDLED_INCLUDEDIR AND NOT Launcher_BUNDLED_INCLUDEDIR STREQUAL "")
projt_push_install_includedir("${Launcher_BUNDLED_INCLUDEDIR}")
endif()
endif()
projt_push_output_dirs("libpng")
projt_push_autogen_disabled()
add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../libpng libpng)
projt_pop_autogen_disabled()
projt_pop_output_dirs()
foreach(_projt_png_target png_shared png_static png_framework)
if(TARGET ${_projt_png_target})
target_compile_definitions(
${_projt_png_target}
PRIVATE adler32=ptpng_adler32
crc32=ptpng_crc32
deflate=ptpng_deflate
deflateInit2_=ptpng_deflateInit2_
deflateReset=ptpng_deflateReset
inflate=ptpng_inflate
inflateInit2_=ptpng_inflateInit2_
inflateReset=ptpng_inflateReset
inflateReset2=ptpng_inflateReset2)
endif()
endforeach()
if(UNIX AND NOT APPLE)
if(DEFINED Launcher_BUNDLED_INCLUDEDIR AND NOT Launcher_BUNDLED_INCLUDEDIR STREQUAL "")
projt_pop_install_includedir()
endif()
if(DEFINED Launcher_BUNDLED_LIBDIR AND NOT Launcher_BUNDLED_LIBDIR STREQUAL "")
projt_pop_install_libdir()
endif()
endif()
endfunction()
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