# wm_xext_check.m4 - Macros to check for X extensions support libraries
#
# Copyright (c) 2013 Christophe CURIS
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# WM_XEXT_CHECK_XRES
# --------------------
#
# Check for the X Resource Window extension
# The check depends on variable 'enable_xshape' being either:
#   yes  - detect, fail if not found
#   no   - do not detect, disable support
#   auto - detect, disable if not found
#
# When found, append appropriate stuff in XLIBS, and append info to
# the variable 'supported_xext'
# When not found, append info to variable 'unsupported'
AC_DEFUN_ONCE([WM_XEXT_CHECK_XRES],
[WM_LIB_CHECK([XRes], [-lXRes], [XResQueryClientIds], [$XLIBS],
    [wm_save_CFLAGS="$CFLAGS"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([dnl
@%:@include <X11/extensions/XRes.h>
], [dnl

  XResQueryClientIds(NULL, 0, NULL, NULL, NULL);])]
        [],
        [AC_MSG_ERROR([found $CACHEVAR but cannot compile using XRes header])])
     CFLAGS="$wm_save_CFLAGS"],
    [supported_xext], [XLIBS], [enable_res], [-])dnl
]) dnl AC_DEFUN


# WM_XEXT_CHECK_XSHAPE
# --------------------
#
# Check for the X Shaped Window extension
# The check depends on variable 'enable_xshape' being either:
#   yes  - detect, fail if not found
#   no   - do not detect, disable support
#   auto - detect, disable if not found
#
# When found, append appropriate stuff in XLIBS, and append info to
# the variable 'supported_xext'
# When not found, append info to variable 'unsupported'
AC_DEFUN_ONCE([WM_XEXT_CHECK_XSHAPE],
[WM_LIB_CHECK([XShape], [-lXext], [XShapeSelectInput], [$XLIBS],
    [wm_save_CFLAGS="$CFLAGS"
     AS_IF([wm_fn_lib_try_compile "X11/extensions/shape.h" "Window win;" "XShapeSelectInput(NULL, win, 0)" ""],
        [],
        [AC_MSG_ERROR([found $CACHEVAR but cannot compile using XShape header])])
     CFLAGS="$wm_save_CFLAGS"],
    [supported_xext], [XLIBS], [enable_shape], [-])dnl
]) dnl AC_DEFUN


# WM_XEXT_CHECK_XSHM
# ------------------
#
# Check for the MIT-SHM extension for Shared Memory support
# The check depends on variable 'enable_shm' being either:
#   yes  - detect, fail if not found
#   no   - do not detect, disable support
#   auto - detect, disable if not found
#
# When found, append appropriate stuff in XLIBS, and append info to
# the variable 'supported_xext'
# When not found, append info to variable 'unsupported'
AC_DEFUN_ONCE([WM_XEXT_CHECK_XSHM],
[WM_LIB_CHECK([XShm], [-lXext], [XShmAttach], [$XLIBS],
    [wm_save_CFLAGS="$CFLAGS"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([dnl
@%:@include <X11/Xlib.h>
@%:@include <X11/extensions/XShm.h>
], [dnl
  XShmSegmentInfo si;

  XShmAttach(NULL, &si);])],
        [],
        [AC_MSG_ERROR([found $CACHEVAR but cannot compile using XShm header])])
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([dnl
@%:@include <sys/ipc.h>
@%:@include <sys/shm.h>
], [dnl
  shmget(IPC_PRIVATE, 1024, IPC_CREAT);])],
        [],
        [AC_MSG_ERROR([found $CACHEVAR but cannot compile using ipc/shm headers])])
     CFLAGS="$wm_save_CFLAGS"],
    [supported_xext], [XLIBS], [enable_shm], [-])dnl
]) dnl AC_DEFUN


# WM_XEXT_CHECK_XMU
# -----------------
#
# Check for the libXmu (X Misceleanous Utilities)
# When found, append it to LIBXMU
# When not found, generate an error because we have no work-around for it
AC_DEFUN_ONCE([WM_EXT_CHECK_XMU],
[AC_CACHE_CHECK([for Xmu library], [wm_cv_xext_xmu],
    [wm_cv_xext_xmu=no
     dnl
     dnl We check that the library is available
     wm_save_LIBS="$LIBS"
     AS_IF([wm_fn_lib_try_link "XmuLookupStandardColormap" "-lXmu"],
         [wm_cv_xext_xmu="-lXmu"])
     LIBS="$wm_save_LIBS"
     AS_IF([test "x$wm_cv_xext_xmu" != "xno"],
       [dnl
       dnl A library was found, check if header is available and compile
       wm_save_CFLAGS="$CFLAGS"
       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([dnl
@%:@include <X11/Xlib.h>
@%:@include <X11/Xutil.h>
@%:@include <X11/Xmu/StdCmap.h>

Display *dpy;
Atom prop;
], [dnl
  XmuLookupStandardColormap(dpy, 0, 0, 0, prop, False, True);]) ],
           [],
           [AC_MSG_ERROR([found $wm_cv_xext_xmu but cannot compile with the header])])
       CFLAGS="$wm_save_CFLAGS"])
    ])
dnl The cached check already reported problems when not found
AS_IF([test "x$wm_cv_xext_xmu" = "xno"],
  [LIBXMU=""
   unsupported="$unsupported Xmu"],
  [AC_DEFINE([HAVE_LIBXMU], [1],
       [defined when the libXmu library was found])
   LIBXMU="$wm_cv_xext_xmu"
   supported_xext="$supported_xext Xmu"])
AC_SUBST(LIBXMU)dnl
])


# WM_XEXT_CHECK_XINERAMA
# ----------------------
#
# Check for the Xinerama extension for multiscreen-as-one support
# The check depends on variable 'enable_xinerama' being either:
#   yes  - detect, fail if not found
#   no   - do not detect, disable support
#   auto - detect, disable if not found
#
# When found, append appropriate stuff in LIBXINERAMA, and append info to
# the variable 'supported_xext'
# When not found, append info to variable 'unsupported'
AC_DEFUN_ONCE([WM_XEXT_CHECK_XINERAMA],
[LIBXINERAMA=""
AS_IF([test "x$enable_xinerama" = "xno"],
    [unsupported="$unsupported Xinerama"],
    [AC_CACHE_CHECK([for Xinerama support library], [wm_cv_xext_xinerama],
        [wm_cv_xext_xinerama=no
         dnl
         dnl We check that the library is available
         wm_save_LIBS="$LIBS"
         for wm_arg in dnl
dnl           Lib flag   % Function name        % info
             "-lXinerama % XineramaQueryScreens" dnl
             "-lXext     % XineramaGetInfo      % solaris" ; do
           AS_IF([wm_fn_lib_try_link "`echo "$wm_arg" | dnl
sed -e 's,^[[^%]]*% *,,' | sed -e 's, *%.*$,,' `" dnl
"$XLFLAGS $XLIBS `echo "$wm_arg" | sed -e 's, *%.*$,,' `"],
             [wm_cv_xext_xinerama="`echo "$wm_arg" | sed -e 's, *%[[^%]]*, ,' `"
              break])
         done
         LIBS="$wm_save_LIBS"
         AS_IF([test "x$wm_cv_xext_xinerama" = "xno"],
             [AS_IF([test "x$enable_xinerama" = "xyesno"],
                 [AC_MSG_ERROR([explicit Xinerama support requested but no library found])])],
             [dnl
              dnl A library was found, check if header is available and compiles
              wm_save_CFLAGS="$CFLAGS"
              AS_CASE([`echo "$wm_cv_xext_xinerama" | sed -e 's,^[[^%]]*,,' `],
                  [*solaris*], [wm_header="X11/extensions/xinerama.h" ; wm_fct="XineramaGetInfo(NULL, 0, NULL, NULL, &intval)"],
                  [wm_header="X11/extensions/Xinerama.h" ; wm_fct="XineramaQueryScreens(NULL, &intval)"])
              AS_IF([wm_fn_lib_try_compile "$wm_header" "int intval;" "$wm_fct" ""],
                  [],
                  [AC_MSG_ERROR([found $wm_cv_xext_xinerama but cannot compile with the header])])
              AS_UNSET([wm_header])
              AS_UNSET([wm_fct])
              CFLAGS="$wm_save_CFLAGS" dnl
         ]) dnl
     ])
     AS_IF([test "x$wm_cv_xext_xinerama" = "xno"],
        [unsupported="$unsupported Xinerama"
         enable_xinerama="no"],
        [LIBXINERAMA="`echo "$wm_cv_xext_xinerama" | sed -e 's, *%.*$,,' `"
         AC_DEFINE([USE_XINERAMA], [1],
             [defined when usable Xinerama library with header was found])
         AS_CASE([`echo "$wm_cv_xext_xinerama" | sed -e 's,^[[^%]]*,,' `],
             [*solaris*], [AC_DEFINE([SOLARIS_XINERAMA], [1],
                 [defined when the Solaris Xinerama extension was detected])])
         supported_xext="$supported_xext Xinerama"])
    ])
AC_SUBST(LIBXINERAMA)dnl
])


# WM_XEXT_CHECK_XRANDR
# --------------------
#
# Check for the X RandR (Resize-and-Rotate) extension
# The check depends on variable 'enable_randr' being either:
#   yes  - detect, fail if not found
#   no   - do not detect, disable support
#   auto - detect, disable if not found
#
# When found, append appropriate stuff in LIBXRANDR, and append info to
# the variable 'supported_xext'
# When not found, append info to variable 'unsupported'
AC_DEFUN_ONCE([WM_XEXT_CHECK_XRANDR],
[WM_LIB_CHECK([RandR], [-lXrandr], [XRRQueryExtension], [$XLIBS],
    [wm_save_CFLAGS="$CFLAGS"
     AS_IF([wm_fn_lib_try_compile "X11/extensions/Xrandr.h" "Display *dpy;" "XRRQueryExtension(dpy, NULL, NULL)" ""],
        [],
        [AC_MSG_ERROR([found $CACHEVAR but cannot compile using XRandR header])])
     CFLAGS="$wm_save_CFLAGS"],
    [supported_xext], [LIBXRANDR], [], [-])dnl
AC_SUBST([LIBXRANDR])dnl
]) dnl AC_DEFUN
