✏ 编辑: FindSDL_image.cmake

# - Locate SDL_image library
# This module defines:
#  SDL_IMAGE_LIBRARIES, the name of the library to link against
#  SDL_IMAGE_INCLUDE_DIRS, where to find the headers
#  SDL_IMAGE_FOUND, if false, do not try to link against
#  SDL_IMAGE_VERSION_STRING - human-readable string containing the version of SDL_image
#
# For backward compatiblity the following variables are also set:
#  SDLIMAGE_LIBRARY (same value as SDL_IMAGE_LIBRARIES)
#  SDLIMAGE_INCLUDE_DIR (same value as SDL_IMAGE_INCLUDE_DIRS)
#  SDLIMAGE_FOUND (same value as SDL_IMAGE_FOUND)
#
# $SDLDIR is an environment variable that would
# correspond to the ./configure --prefix=$SDLDIR
# used in building SDL.
#
# Created by Eric Wing. This was influenced by the FindSDL.cmake
# module, but with modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).

#=============================================================================
# Copyright 2005-2009 Kitware, Inc.
# Copyright 2012 Benjamin Eikel
#
# 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.)

if(NOT SDL_IMAGE_INCLUDE_DIR AND SDLIMAGE_INCLUDE_DIR)
  set(SDL_IMAGE_INCLUDE_DIR ${SDLIMAGE_INCLUDE_DIR} CACHE PATH "directory cache
entry initialized from old variable name")
endif()
find_path(SDL_IMAGE_INCLUDE_DIR SDL_image.h
  HINTS
    ENV SDLIMAGEDIR
    ENV SDLDIR
  PATH_SUFFIXES include/SDL include/SDL12 include/SDL11 include
)

if(NOT SDL_IMAGE_LIBRARY AND SDLIMAGE_LIBRARY)
  set(SDL_IMAGE_LIBRARY ${SDLIMAGE_LIBRARY} CACHE FILEPATH "file cache entry
initialized from old variable name")
endif()
find_library(SDL_IMAGE_LIBRARY
  NAMES SDL_image
  HINTS
    ENV SDLIMAGEDIR
    ENV SDLDIR
  PATH_SUFFIXES lib
)

if(SDL_IMAGE_INCLUDE_DIR AND EXISTS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h")
  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+[0-9]+$")
  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+[0-9]+$")
  file(STRINGS "${SDL_IMAGE_INCLUDE_DIR}/SDL_image.h" SDL_IMAGE_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+[0-9]+$")
  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_MAJOR "${SDL_IMAGE_VERSION_MAJOR_LINE}")
  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_MINOR "${SDL_IMAGE_VERSION_MINOR_LINE}")
  string(REGEX REPLACE "^#define[ \t]+SDL_IMAGE_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL_IMAGE_VERSION_PATCH "${SDL_IMAGE_VERSION_PATCH_LINE}")
  set(SDL_IMAGE_VERSION_STRING ${SDL_IMAGE_VERSION_MAJOR}.${SDL_IMAGE_VERSION_MINOR}.${SDL_IMAGE_VERSION_PATCH})
  unset(SDL_IMAGE_VERSION_MAJOR_LINE)
  unset(SDL_IMAGE_VERSION_MINOR_LINE)
  unset(SDL_IMAGE_VERSION_PATCH_LINE)
  unset(SDL_IMAGE_VERSION_MAJOR)
  unset(SDL_IMAGE_VERSION_MINOR)
  unset(SDL_IMAGE_VERSION_PATCH)
endif()

set(SDL_IMAGE_LIBRARIES ${SDL_IMAGE_LIBRARY})
set(SDL_IMAGE_INCLUDE_DIRS ${SDL_IMAGE_INCLUDE_DIR})

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL_image
                                  REQUIRED_VARS SDL_IMAGE_LIBRARIES SDL_IMAGE_INCLUDE_DIRS
                                  VERSION_VAR SDL_IMAGE_VERSION_STRING)

# for backward compatiblity
set(SDLIMAGE_LIBRARY ${SDL_IMAGE_LIBRARIES})
set(SDLIMAGE_INCLUDE_DIR ${SDL_IMAGE_INCLUDE_DIRS})
set(SDLIMAGE_FOUND ${SDL_IMAGE_FOUND})

mark_as_advanced(SDL_IMAGE_LIBRARY SDL_IMAGE_INCLUDE_DIR)

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