add libcairo dependency

cmake_minimum_required(VERSION 2.8.8)

project(signaltk)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/extra/cmake")

set(CMAKE_CXX_STANDARD 11)

# INCLUDES

include_directories(${CMAKE_CURRENT_SOURCE_DIR})

# DEPENDENCIES

find_package(Threads)

find_package(Cairo)

include_directories(${CAIRO_INCLUDE_DIRS})

add_subdirectory(core/plot)

add_subdirectory(core/util)

# - Try to find Cairo

# Once done, this will define

#

#  CAIRO_FOUND - system has Cairo

#  CAIRO_INCLUDE_DIRS - the Cairo include directories

#  CAIRO_LIBRARIES - link these to use Cairo

#

# Copyright (C) 2012 Raphael Kubo da Costa <rakuco@webkit.org>

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

# 1.  Redistributions of source code must retain the above copyright

#     notice, this list of conditions and the following disclaimer.

# 2.  Redistributions in binary form must reproduce the above copyright

#     notice, this list of conditions and the following disclaimer in the

#     documentation and/or other materials provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND ITS CONTRIBUTORS ``AS

# IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ITS

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

FIND_PACKAGE(PkgConfig)

PKG_CHECK_MODULES(PC_CAIRO cairo) # FIXME: After we require CMake 2.8.2 we can pass QUIET to this call.

FIND_PATH(CAIRO_INCLUDE_DIRS

    NAMES cairo.h

    HINTS ${PC_CAIRO_INCLUDEDIR}

          ${PC_CAIRO_INCLUDE_DIRS}

    PATH_SUFFIXES cairo

)

FIND_LIBRARY(CAIRO_LIBRARIES

    NAMES cairo

    HINTS ${PC_CAIRO_LIBDIR}

          ${PC_CAIRO_LIBRARY_DIRS}

)

IF (CAIRO_INCLUDE_DIRS)

    IF (EXISTS "${CAIRO_INCLUDE_DIRS}/cairo-version.h")

        FILE(READ "${CAIRO_INCLUDE_DIRS}/cairo-version.h" CAIRO_VERSION_CONTENT)

        STRING(REGEX MATCH "#define +CAIRO_VERSION_MAJOR +([0-9]+)" _dummy "${CAIRO_VERSION_CONTENT}")

        SET(CAIRO_VERSION_MAJOR "${CMAKE_MATCH_1}")

        STRING(REGEX MATCH "#define +CAIRO_VERSION_MINOR +([0-9]+)" _dummy "${CAIRO_VERSION_CONTENT}")

        SET(CAIRO_VERSION_MINOR "${CMAKE_MATCH_1}")

        STRING(REGEX MATCH "#define +CAIRO_VERSION_MICRO +([0-9]+)" _dummy "${CAIRO_VERSION_CONTENT}")

        SET(CAIRO_VERSION_MICRO "${CMAKE_MATCH_1}")

        SET(CAIRO_VERSION "${CAIRO_VERSION_MAJOR}.${CAIRO_VERSION_MINOR}.${CAIRO_VERSION_MICRO}")

    ENDIF ()

ENDIF ()

# FIXME: Should not be needed anymore once we start depending on CMake 2.8.3

SET(VERSION_OK TRUE)

IF (Cairo_FIND_VERSION)

    IF (Cairo_FIND_VERSION_EXACT)

        IF ("${Cairo_FIND_VERSION}" VERSION_EQUAL "${CAIRO_VERSION}")

            # FIXME: Use IF (NOT ...) with CMake 2.8.2+ to get rid of the ELSE block

        ELSE ()

            SET(VERSION_OK FALSE)

        ENDIF ()

    ELSE ()

        IF ("${Cairo_FIND_VERSION}" VERSION_GREATER "${CAIRO_VERSION}")

            SET(VERSION_OK FALSE)

        ENDIF ()

    ENDIF ()

ENDIF ()

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(Cairo DEFAULT_MSG CAIRO_INCLUDE_DIRS CAIRO_LIBRARIES VERSION_OK)

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