From 68b8e4272dc7cb808323e7b37bd02170403332bd Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 6 Jul 2010 18:09:59 +0200
Subject: Add --disable-cairo option and compile without Cairo

---
 config.h.in      |  3 +++
 configure        | 40 ++++++++++++++++++++++++++++++++++++++++
 configure.ac     | 22 ++++++++++++++++++++++
 src/render_hkl.c | 12 ++++++++++++
 4 files changed, 77 insertions(+)

diff --git a/config.h.in b/config.h.in
index ebef052e..1f653132 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,5 +1,8 @@
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
+/* Define to 1 if Cairo is available */
+#undef HAVE_CAIRO
+
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H
 
diff --git a/configure b/configure
index d8b89ea5..80059d8b 100755
--- a/configure
+++ b/configure
@@ -742,6 +742,7 @@ enable_gtktest
 enable_png
 enable_tiff
 with_libtiff
+enable_cairo
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1387,6 +1388,7 @@ Optional Features:
   --disable-gtktest       do not try to compile and run a test GTK+ program
   --disable-png           Disable the use of libPNG
   --disable-tiff          Disable the use of libTIFF
+  --disable-cairo         Disable the use of Cairo
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -5774,6 +5776,44 @@ fi
 
 
 
+{ $as_echo "$as_me:$LINENO: checking whether to use Cairo" >&5
+$as_echo_n "checking whether to use Cairo... " >&6; }
+# Check whether --enable-cairo was given.
+if test "${enable_cairo+set}" = set; then
+  enableval=$enable_cairo;
+fi
+
+if test "x$enable_cairo" != "xno"; then
+
+   { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+   { $as_echo "$as_me:$LINENO: checking Cairo" >&5
+$as_echo_n "checking Cairo... " >&6; }
+   if $PKG_CONFIG --atleast-version 1.2.0 cairo ; then
+      CAIRO_VERSION=`$PKG_CONFIG --modversion cairo`
+      CAIRO_CFLAGS=`$PKG_CONFIG --cflags cairo`
+      CAIRO_LIBS=`$PKG_CONFIG --libs cairo`
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_CAIRO 1
+_ACEOF
+
+      { $as_echo "$as_me:$LINENO: result: $CAIRO_VERSION" >&5
+$as_echo "$CAIRO_VERSION" >&6; }
+   else
+      { $as_echo "$as_me:$LINENO: result: not found.  Some functions will be unavailable." >&5
+$as_echo "not found.  Some functions will be unavailable." >&6; }
+   fi
+
+else
+
+   { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+fi
+
+
+
 CFLAGS="$CFLAGS $HDF5_CFLAGS $GTK_CFLAGS $GSL_CFLAGS $OPENCL_CFLAGS -pthread"
 CFLAGS="$CFLAGS $LIBTIFF_CFLAGS"
 LIBS="$LIBS $HDF5_LIBS -lm -lz $GSL_LIBS $GTK_LIBS $OPENCL_LIBS -pthread"
diff --git a/configure.ac b/configure.ac
index 3dba3c16..465f5b73 100644
--- a/configure.ac
+++ b/configure.ac
@@ -129,6 +129,28 @@ AS_IF([test "x$enable_tiff" != "xno"],
 ])
 
 
+AC_MSG_CHECKING([whether to use Cairo])
+AC_ARG_ENABLE([cairo],
+              AS_HELP_STRING([--disable-cairo], [Disable the use of Cairo]))
+AS_IF([test "x$enable_cairo" != "xno"],
+[
+   AC_MSG_RESULT([yes])
+   AC_MSG_CHECKING([Cairo])
+   if $PKG_CONFIG --atleast-version 1.2.0 cairo ; then
+      CAIRO_VERSION=`$PKG_CONFIG --modversion cairo`
+      CAIRO_CFLAGS=`$PKG_CONFIG --cflags cairo`
+      CAIRO_LIBS=`$PKG_CONFIG --libs cairo`
+      AC_DEFINE([HAVE_CAIRO], [1], [Define to 1 if Cairo is available])
+      AC_MSG_RESULT($CAIRO_VERSION)
+   else
+      AC_MSG_RESULT([not found.  Some functions will be unavailable.])
+   fi
+],
+[
+   AC_MSG_RESULT([no])
+])
+
+
 CFLAGS="$CFLAGS $HDF5_CFLAGS $GTK_CFLAGS $GSL_CFLAGS $OPENCL_CFLAGS -pthread"
 CFLAGS="$CFLAGS $LIBTIFF_CFLAGS"
 LIBS="$LIBS $HDF5_LIBS -lm -lz $GSL_LIBS $GTK_LIBS $OPENCL_LIBS -pthread"
diff --git a/src/render_hkl.c b/src/render_hkl.c
index d7a9069e..de8e3021 100644
--- a/src/render_hkl.c
+++ b/src/render_hkl.c
@@ -20,8 +20,10 @@
 #include <string.h>
 #include <unistd.h>
 #include <getopt.h>
+#ifdef HAVE_CAIRO
 #include <cairo.h>
 #include <cairo-pdf.h>
+#endif
 
 #include "utils.h"
 #include "reflections.h"
@@ -43,7 +45,9 @@ static void show_help(const char *s)
 "\n"
 "  -h, --help              Display this help message.\n"
 "      --povray            Render a 3D animation using POV-ray.\n"
+#ifdef HAVE_CAIRO
 "      --zone-axis         Render a 2D zone axis pattern.\n"
+#endif
 "      --boost=<val>       Squash colour scale by <val>.\n"
 "  -j <n>                  Run <n> instances of POV-ray in parallel.\n"
 "  -p, --pdb=<file>        PDB file from which to get the unit cell.\n"
@@ -60,6 +64,7 @@ static void show_help(const char *s)
 }
 
 
+#ifdef HAVE_CAIRO
 static void render_za(UnitCell *cell, double *ref, unsigned int *c,
                       double boost, const char *sym, int wght)
 {
@@ -275,6 +280,7 @@ out:
 	cairo_surface_finish(surface);
 	cairo_destroy(dctx);
 }
+#endif
 
 
 int main(int argc, char *argv[])
@@ -393,7 +399,13 @@ int main(int argc, char *argv[])
 	if ( config_povray ) {
 		r = povray_render_animation(cell, ref, cts, nproc);
 	} else if ( config_zoneaxis ) {
+#ifdef HAVE_CAIRO
 		render_za(cell, ref, cts, boost, sym, wght);
+#else
+		ERROR("This version of CrystFEL was compiled without Cairo");
+		ERROR(" support, which is required to plot a zone axis");
+		ERROR(" pattern.  Sorry!\n");
+#endif
 	} else {
 		ERROR("Try again with either --povray or --zone-axis.\n");
 	}
-- 
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