[gimp] Require cairo >= 1.8.0 and add a cairo sanity check to app/sanity.c

[Michael Natterer <mitch src gnome org>]

commit 3762e03bf6c386a54d4ba4ce0c2a37211b466507
Author: Michael Natterer <mitch gimp org>
Date:   Sun Aug 8 16:49:50 2010 +0200

    Require cairo >= 1.8.0 and add a cairo sanity check to app/sanity.c

 app/sanity.c |   35 +++++++++++++++++++++++++++++++++++
 configure.ac |    2 +-
 2 files changed, 36 insertions(+), 1 deletions(-)
---
diff --git a/app/sanity.c b/app/sanity.c
index 9220ffc..53f7601 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -17,6 +17,7 @@
 
 #include "config.h"
 
+#include <cairo/cairo.h>
 #include <fontconfig/fontconfig.h>
 #include <pango/pango.h>
 #include <pango/pangoft2.h>
@@ -31,6 +32,7 @@
 
 static gchar * sanity_check_gimp              (void);
 static gchar * sanity_check_glib              (void);
+static gchar * sanity_check_cairo             (void);
 static gchar * sanity_check_pango             (void);
 static gchar * sanity_check_fontconfig        (void);
 static gchar * sanity_check_freetype          (void);
@@ -50,6 +52,9 @@ sanity_check (void)
     abort_message = sanity_check_glib ();
 
   if (! abort_message)
+    abort_message = sanity_check_cairo ();
+
+  if (! abort_message)
     abort_message = sanity_check_pango ();
 
   if (! abort_message)
@@ -150,6 +155,36 @@ sanity_check_glib (void)
 }
 
 static gchar *
+sanity_check_cairo (void)
+{
+#define CAIRO_REQUIRED_MAJOR 1
+#define CAIRO_REQUIRED_MINOR 8
+#define CAIRO_REQUIRED_MICRO 0
+
+  if (cairo_version () < CAIRO_VERSION_ENCODE (CAIRO_REQUIRED_MAJOR,
+                                               CAIRO_REQUIRED_MINOR,
+                                               CAIRO_REQUIRED_MICRO))
+    {
+      return g_strdup_printf
+        ("The Cairo version being used is too old!\n\n"
+         "GIMP requires Cairo version %d.%d.%d or later.\n"
+         "Installed Cairo version is %s.\n\n"
+         "Somehow you or your software packager managed\n"
+         "to install GIMP with an older Cairo version.\n\n"
+         "Please upgrade to Cairo version %d.%d.%d or later.",
+         CAIRO_REQUIRED_MAJOR, CAIRO_REQUIRED_MINOR, CAIRO_REQUIRED_MICRO,
+         cairo_version_string (),
+         CAIRO_REQUIRED_MAJOR, CAIRO_REQUIRED_MINOR, CAIRO_REQUIRED_MICRO);
+    }
+
+#undef CAIRO_REQUIRED_MAJOR
+#undef CAIRO_REQUIRED_MINOR
+#undef CAIRO_REQUIRED_MICRO
+
+  return NULL;
+}
+
+static gchar *
 sanity_check_pango (void)
 {
 #define PANGO_REQUIRED_MAJOR 1
diff --git a/configure.ac b/configure.ac
index 76f7612..066ae2f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ m4_define([gegl_required_version], [0.1.2])
 m4_define([glib_required_version], [2.24.0])
 m4_define([gtk_required_version], [2.20.0])
 m4_define([gdk_pixbuf_required_version], [gtk_required_version])
-m4_define([cairo_required_version], [1.6.0])
+m4_define([cairo_required_version], [1.8.0])
 m4_define([pangocairo_required_version], [1.20.1])
 m4_define([fontconfig_required_version], [2.2.0])
 m4_define([gtkdoc_required_version], [1.0])