diff options
Diffstat (limited to 'Modules/FindPNG.cmake')
| -rw-r--r-- | Modules/FindPNG.cmake | 103 |
1 files changed, 71 insertions, 32 deletions
diff --git a/Modules/FindPNG.cmake b/Modules/FindPNG.cmake index a2577d26b..dceb6bcc5 100644 --- a/Modules/FindPNG.cmake +++ b/Modules/FindPNG.cmake @@ -1,32 +1,49 @@ -# - Find the native PNG includes and library +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. + +#.rst: +# FindPNG +# ------- # -# This module searches libpng, the library for working with PNG images. +# Find libpng, the official reference library for the PNG image format. # -# It defines the following variables -# PNG_INCLUDE_DIRS, where to find png.h, etc. -# PNG_LIBRARIES, the libraries to link against to use PNG. -# PNG_DEFINITIONS - You should add_definitons(${PNG_DEFINITIONS}) before compiling code that includes png library files. -# PNG_FOUND, If false, do not try to use PNG. -# PNG_VERSION_STRING - the version of the PNG library found (since CMake 2.8.8) -# Also defined, but not for general use are -# PNG_LIBRARY, where to find the PNG library. -# For backward compatiblity the variable PNG_INCLUDE_DIR is also set. It has the same value as PNG_INCLUDE_DIRS. +# Imported targets +# ^^^^^^^^^^^^^^^^ # -# Since PNG depends on the ZLib compression library, none of the above will be -# defined unless ZLib can be found. - -#============================================================================= -# Copyright 2002-2009 Kitware, Inc. +# This module defines the following :prop_tgt:`IMPORTED` target: +# +# ``PNG::PNG`` +# The libpng library, if found. +# +# Result variables +# ^^^^^^^^^^^^^^^^ +# +# This module will set the following variables in your project: +# +# ``PNG_INCLUDE_DIRS`` +# where to find png.h, etc. +# ``PNG_LIBRARIES`` +# the libraries to link against to use PNG. +# ``PNG_DEFINITIONS`` +# You should add_definitions(${PNG_DEFINITIONS}) before compiling code +# that includes png library files. +# ``PNG_FOUND`` +# If false, do not try to use PNG. +# ``PNG_VERSION_STRING`` +# the version of the PNG library found (since CMake 2.8.8) # -# Distributed under the OSI-approved BSD License (the "License"); -# see accompanying file Copyright.txt for details. +# Obsolete variables +# ^^^^^^^^^^^^^^^^^^ # -# This software is distributed WITHOUT ANY WARRANTY; without even the -# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -# See the License for more information. -#============================================================================= -# (To distribute this file outside of CMake, substitute the full -# License text for the above reference.) +# The following variables may also be set, for backwards compatibility: +# +# ``PNG_LIBRARY`` +# where to find the PNG library. +# ``PNG_INCLUDE_DIR`` +# where to find the PNG headers (same as PNG_INCLUDE_DIRS) +# +# Since PNG depends on the ZLib compression library, none of the above +# will be defined unless ZLib can be found. if(PNG_FIND_QUIETLY) set(_FIND_ZLIB_ARG QUIET) @@ -41,10 +58,8 @@ if(ZLIB_FOUND) list(APPEND PNG_NAMES png libpng) unset(PNG_NAMES_DEBUG) set(_PNG_VERSION_SUFFIXES 17 16 15 14 12) - if (PNG_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\..*)?$") - string(REGEX REPLACE - "^([0-9]+)\\.([0-9]+).*" "\\1\\2" - _PNG_VERSION_SUFFIX_MIN "${PNG_FIND_VERSION}") + if (PNG_FIND_VERSION MATCHES "^([0-9]+)\\.([0-9]+)(\\..*)?$") + set(_PNG_VERSION_SUFFIX_MIN "${CMAKE_MATCH_1}${CMAKE_MATCH_2}") if (PNG_FIND_VERSION_EXACT) set(_PNG_VERSION_SUFFIXES ${_PNG_VERSION_SUFFIX_MIN}) else () @@ -59,7 +74,7 @@ if(ZLIB_FOUND) list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d) endforeach() unset(_PNG_VERSION_SUFFIXES) - # For compatiblity with versions prior to this multi-config search, honor + # For compatibility with versions prior to this multi-config search, honor # any PNG_LIBRARY that is already specified and skip the search. if(NOT PNG_LIBRARY) find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES}) @@ -78,7 +93,7 @@ if(ZLIB_FOUND) if (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR) # png.h includes zlib.h. Sigh. set(PNG_INCLUDE_DIRS ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} ) - set(PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS} ) # for backward compatiblity + set(PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS} ) # for backward compatibility set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY}) if (CYGWIN) @@ -89,6 +104,32 @@ if(ZLIB_FOUND) endif() endif () + if(NOT TARGET PNG::PNG) + add_library(PNG::PNG UNKNOWN IMPORTED) + set_target_properties(PNG::PNG PROPERTIES + INTERFACE_COMPILE_DEFINITIONS "${PNG_DEFINITIONS}" + INTERFACE_INCLUDE_DIRECTORIES "${PNG_INCLUDE_DIRS}" + INTERFACE_LINK_LIBRARIES ZLIB::ZLIB) + if(EXISTS "${PNG_LIBRARY}") + set_target_properties(PNG::PNG PROPERTIES + IMPORTED_LINK_INTERFACE_LANGUAGES "C" + IMPORTED_LOCATION "${PNG_LIBRARY}") + endif() + if(EXISTS "${PNG_LIBRARY_RELEASE}") + set_property(TARGET PNG::PNG APPEND PROPERTY + IMPORTED_CONFIGURATIONS RELEASE) + set_target_properties(PNG::PNG PROPERTIES + IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "C" + IMPORTED_LOCATION_RELEASE "${PNG_LIBRARY_RELEASE}") + endif() + if(EXISTS "${PNG_LIBRARY_DEBUG}") + set_property(TARGET PNG::PNG APPEND PROPERTY + IMPORTED_CONFIGURATIONS DEBUG) + set_target_properties(PNG::PNG PROPERTIES + IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "C" + IMPORTED_LOCATION_DEBUG "${PNG_LIBRARY_DEBUG}") + endif() + endif() endif () if (PNG_PNG_INCLUDE_DIR AND EXISTS "${PNG_PNG_INCLUDE_DIR}/png.h") @@ -99,8 +140,6 @@ if(ZLIB_FOUND) endif () endif() -# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if -# all listed variables are TRUE include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) find_package_handle_standard_args(PNG REQUIRED_VARS PNG_LIBRARY PNG_PNG_INCLUDE_DIR |