initical commit

cmake/FindJPEG.cmake

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+# - This module determines the jpeg library of the system
+# The following variables are set if the library found:
+# JPEG_FOUND - If false do nnt try to use jpeg.
+# JPEG_INCLUDE_DIR - where to find the headfile of library.
+# JPEG_LIBRARY_DIR - where to find the jpeg library.
+# JPEG_LIBRARY - the library needed to use jpeg.
+
+# find the headfile of library
+
+set (JPEG_HEADS jpeglib.h)
+find_path (JPEG_INCLUDE_DIR ${JPEG_HEADS})
+
+set (JPEG_NAMES jpeg libjpeg)
+find_library (JPEG_LIBRARY NAMES ${JPEG_NAMES})
+
+# just find one of dependency, guess other one.
+if (NOT JPEG_LIBRARY AND JPEG_INCLUDE_DIR)
+	message ("We just find the headfile, try to guess the library location.")
+	set (JPEG_LIBRARY_DIR "${JPEG_INCLUDE_DIR}/../lib")
+	find_library (JPEG_LIBRARY NAMES ${JPEG_NAMES} PATHS ${JPEG_LIBRARY_DIR})
+elseif (NOT JPEG_INCLUDE_DIR AND JPEG_LIBRARY)
+	message ("We just find the lib file, try to guess the include location.")
+	string (REGEX REPLACE "[a-z|A-Z|0-9|_|-]+[.].*$" "" JPEG_LIBRARY_DIR ${JPEG_LIBRARY})
+	find_path (JPEG_INCLUDE_DIR ${JPEG_HEADS} "${JPEG_LIBRARY_DIR}../included")
+endif()
+
+# find the library.
+if (JPEG_INCLUDE_DIR AND JPEG_LIBRARY)
+	set (JPEG_FOUND TRUE)
+	if (NOT JPEG_LIBRARY_DIR)
+		string (REGEX REPLACE "[a-z|A-Z|0-9|_|-]+[.].*$" "" JPEG_LIBRARY_DIR ${JPEG_LIBRARY})
+	endif ()
+    string (REGEX MATCH "[a-z|A-Z|0-9|_|-]+[.](a|so|lib|dll|LIB|DLL)[^/]*$" JPEG_LIBRARY_WHOLE_NAME "${JPEG_LIBRARY}")
+    string (REGEX MATCH "[^(lib)][a-z|A-Z|0-9|_|-]+" JPEG_LIBRARY_NAME ${JPEG_LIBRARY_WHOLE_NAME})
+	message (STATUS "Find JPEG include in ${JPEG_INCLUDE_DIR}")
+	message (STATUS "Find JPEG library in ${JPEG_LIBRARY}")
+else ()
+	message (STATUS "Could NOT find JPEG, (missing: JPEG_INCLUDE_DIR JPEG_LIBRARY)")
+endif ()
+