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#.rst:
# FindLibpng
# ----------
#
# Find the PNG library.
#
# Imported targets
# ^^^^^^^^^^^^^^^^
#
# This module defines the following :prop_tgt:`IMPORTED` target:
#
# ``Libpng::Libpng``
# The Libpng library, if found.
#
# Result variables
# ^^^^^^^^^^^^^^^^
#
# This module will set the following variables in your project:
#
# ``LIBPNG_INCLUDE_DIRS``
# where to find png.h, etc.
# ``LIBPNG_LIBRARIES``
# the libraries to link against to use Libpng.
# ``Libpng_FOUND``
# If false, do not try to use Libpng.
find_package(ZLIB)
if(NOT LIBPNG_INCLUDE_DIR)
find_path(LIBPNG_INCLUDE_DIR png.h)
endif()
if(NOT LIBPNG_LIBRARY)
find_library(LIBPNG_LIBRARY NAMES png libpng16)
endif()
if(LIBPNG_INCLUDE_DIR)
if(NOT LIBPNG_VERSION_STRING)
file(READ ${LIBPNG_INCLUDE_DIR}/png.h LIBPNG_H_TEXT)
string(REGEX REPLACE ".*#define PNG_LIBPNG_VER_STRING \"([0-9]+.[0-9]+.[0-9]+)\".*" "\\1" LIBPNG_VERSION_STRING
${LIBPNG_H_TEXT}
)
endif()
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
Libpng
VERSION_VAR
LIBPNG_VERSION_STRING
REQUIRED_VARS
LIBPNG_LIBRARY
LIBPNG_INCLUDE_DIR
ZLIB_FOUND
LIBPNG_VERSION_STRING
)
if(Libpng_FOUND)
set(LIBPNG_INCLUDE_DIRS ${LIBPNG_INCLUDE_DIR})
set(LIBPNG_LIBRARIES ${LIBPNG_LIBRARY})
if(NOT TARGET Libpng::Libpng)
add_library(Libpng::Libpng UNKNOWN IMPORTED)
set_target_properties(
Libpng::Libpng
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${LIBPNG_INCLUDE_DIRS}"
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${LIBPNG_LIBRARY}"
INTERFACE_LINK_LIBRARIES "ZLIB::ZLIB"
)
endif()
elseif(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
message(FATAL_ERROR "${CMAKE_FIND_PACKAGE_NAME} was required but could not be found.")
endif()
mark_as_advanced(LIBPNG_INCLUDE_DIR LIBPNG_LIBRARY)
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