RmlUi/CMake/Modules/FindSDL2_image.cmake

# Locate SDL2_image library
# This module defines
# SDL2_IMAGE_LIBRARY, the name of the library to link against
# SDL2_IMAGE_FOUND, if false, do not try to link to SDL2_image
# SDL2_IMAGE_INCLUDE_DIR, where to find SDL.h
#
# Source: https://code.google.com/p/freerct/source/browse/trunk/CMake/FindSDL2_ttf.cmake
#
# $SDL2_IMAGE_DIR is an environment variable that would
# correspond to the ./configure --prefix=$SDL2_IMAGE_DIR
# used in building SDL2_image.
# l.e.galup  9-20-02
#
# Modified by Eric Wing.
# Added code to assist with automated building by using environmental variables
# and providing a more controlled/consistent search behavior.
# Added new modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).
# Also corrected the header search path to follow "proper" SDL guidelines.
# Added a search for SDL2main which is needed by some platforms.
# Added a search for threads which is needed by some platforms.
# Added needed compile switches for MinGW.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL2_LIBRARY to override this selection or set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
#
# Note that the header path has changed from SDL2/SDL.h to just SDL.h
# This needed to change because "proper" SDL convention
# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
# reasons because not all systems place things in SDL2/ (see FreeBSD).

#=============================================================================
# Copyright 2003-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# 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.)

SET(SDL2_IMAGE_SEARCH_PATHS
        ~/Library/Frameworks
        /Library/Frameworks
        /usr/local
        /usr
        /sw # Fink
        /opt/local # DarwinPorts
        /opt/csw # Blastwave
        /opt
)

FIND_PATH(SDL2_IMAGE_INCLUDE_DIR SDL_image.h
        HINTS
        $ENV{SDL2_IMAGE_DIR}
        PATH_SUFFIXES include/SDL2 include
        PATHS ${SDL2_IMAGE_SEARCH_PATHS}
)

FIND_LIBRARY(SDL2_IMAGE_LIBRARY_TEMP
        NAMES SDL2_image
        HINTS
        $ENV{SDL2_IMAGE_DIR}
        PATH_SUFFIXES lib64 lib
        PATHS ${SDL2_IMAGE_SEARCH_PATHS}
)

# SDL2_image may require threads on your system.
# The Apple build may not need an explicit flag because one of the
# frameworks may already provide it.
# But for non-OSX systems, I will use the CMake Threads package.
# IF(NOT APPLE)
        # FIND_PACKAGE(Threads)
# ENDIF(NOT APPLE)

# MinGW needs an additional library, mwindows
# It's total link flags should look like -lmingw32 -lSDL2_image -lmwindows
# (Actually on second look, I think it only needs one of the m* libraries.)
IF(MINGW)
        SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
ENDIF(MINGW)

IF(SDL2_IMAGE_LIBRARY_TEMP)
        # For OS X, SDL2_IMAGE uses Cocoa as a backend so it must link to Cocoa.
        # CMake doesn't display the -framework Cocoa string in the UI even
        # though it actually is there if I modify a pre-used variable.
        # I think it has something to do with the CACHE STRING.
        # So I use a temporary variable until the end so I can set the
        # "real" variable in one-shot.
        # IF(APPLE)
                # SET(SDL2_IMAGE_LIBRARY_TEMP ${SDL2_IMAGE_LIBRARY_TEMP} "-framework Cocoa")
        # ENDIF(APPLE)

        # For threads, as mentioned Apple doesn't need this.
        # In fact, there seems to be a problem if I used the Threads package
        # and try using this line, so I'm just skipping it entirely for OS X.
        # IF(NOT APPLE)
                # SET(SDL2_IMAGE_LIBRARY_TEMP ${SDL2_IMAGE_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
        # ENDIF(NOT APPLE)

        # For MinGW library
        # IF(MINGW)
                # SET(SDL2_IMAGE_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_IMAGE_LIBRARY_TEMP})
        # ENDIF(MINGW)

        # Set the final string here so the GUI reflects the final state.
        SET(SDL2_IMAGE_LIBRARY ${SDL2_IMAGE_LIBRARY_TEMP} CACHE STRING "Where the SDL2_IMAGE Library can be found")
        # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
        SET(SDL2_IMAGE_LIBRARY_TEMP "${SDL2_IMAGE_LIBRARY_TEMP}" CACHE INTERNAL "")
ENDIF(SDL2_IMAGE_LIBRARY_TEMP)

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2_image REQUIRED_VARS SDL2_IMAGE_LIBRARY SDL2_IMAGE_INCLUDE_DIR)