[seed] Cairo stuff

[Robert Carr <racarr src gnome org>]

commit 4515ec61c20c6613f298bb81c0b4d7aeff0516cc
Author: Robert Carr <racarr svn gnome org>
Date:   Thu May 14 22:57:01 2009 -0400

    Cairo stuff
---
 configure.ac               |    3 +++
 modules/cairo/Makefile.am  |    2 ++
 modules/cairo/seed-cairo.c |   29 +++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7a1d70b..9627308 100644
--- a/configure.ac
+++ b/configure.ac
@@ -101,6 +101,9 @@ if test x"$want_canvas_module" == x"yes" ; then
 	PKG_CHECK_MODULES(CAIRO, cairo)
 	AC_SUBST(CAIRO_CFLAGS)
 	AC_SUBST(CAIRO_LDFLAGS)
+	PKG_CHECK_MODULES(GDK, gdk-2.0)
+	AC_SUBST(GDK_CFLAGS)
+	AC_SUBST(GDK_LDFLAGS)
 fi
 
 AM_CONDITIONAL(BUILD_CANVAS_MODULE, test "x$want_canvas_module" = "xyes")
diff --git a/modules/cairo/Makefile.am b/modules/cairo/Makefile.am
index 5bcad71..15de8e5 100644
--- a/modules/cairo/Makefile.am
+++ b/modules/cairo/Makefile.am
@@ -19,11 +19,13 @@ libcairo_la_CFLAGS = \
         $(GOBJECT_INTROSPECTION_CFLAGS) \
 	-I top_srcdir@/libseed/ \
 	$(CAIRO_CFLAGS) \
+	$(GDK_CFLAGS) \
 	$(SEED_DEBUG_CFLAGS) \
 	$(SEED_PROFILE_CFLAGS)
 
 libcairo_la_LDFLAGS = \
         $(GOBJECT_INTROSPECTION_LDFLAGS) \
+	$(GDK_LDFLAGS) \
 	$(CAIRO_LDFLAGS) \
 	$(SEED_PROFILE_LIBS)
 
diff --git a/modules/cairo/seed-cairo.c b/modules/cairo/seed-cairo.c
index 4ae0647..301b2c6 100644
--- a/modules/cairo/seed-cairo.c
+++ b/modules/cairo/seed-cairo.c
@@ -1,5 +1,6 @@
 #include <seed.h>
 #include <cairo/cairo.h>
+#include <gdk/gdk.h>
 #include "seed-cairo.h"
 #include "seed-cairo-surface.h"
 #include "seed-cairo-image-surface.h"
@@ -97,6 +98,28 @@ seed_cairo_construct_context (SeedContext ctx,
   return seed_object_from_cairo_context (ctx, cairo_create (surf));
 }
 
+static SeedObject
+seed_cairo_construct_context_from_drawable (SeedContext ctx,
+					    SeedObject constructor,
+					    size_t argument_count,
+					    const SeedValue arguments[],
+					    SeedException * exception)
+{
+  GObject *obj;
+  if (argument_count != 1)
+    {
+      EXPECTED_EXCEPTION ("Context", "1 argument");
+    }
+  obj = seed_value_to_object (ctx, arguments[0], exception);
+  if (!GDK_IS_DRAWABLE(obj))
+    {
+      seed_make_exception (ctx, exception, "ArgumentError", "Context.from_drawable requires a GdkDrawable argument");
+      return seed_make_null (ctx);
+    }
+
+  return seed_object_from_cairo_context (ctx, gdk_cairo_create (GDK_DRAWABLE (obj)));
+}
+
 static SeedValue 
 seed_cairo_save (SeedContext ctx,
 		 SeedObject function,
@@ -1693,6 +1716,7 @@ SeedObject
 seed_module_init(SeedEngine * local_eng)
 {
   SeedObject context_constructor_ref;
+  SeedObject gdk_context_constructor_ref;
   SeedObject namespace_ref;
   seed_class_definition cairo_def = seed_empty_class;
   eng = local_eng;
@@ -1716,8 +1740,13 @@ seed_module_init(SeedEngine * local_eng)
 						   NULL,
 						   //				   seed_cairo_context_class,
 						   seed_cairo_construct_context);
+  gdk_context_constructor_ref = seed_make_constructor (eng->context,
+						       NULL,
+						       //				   seed_cairo_context_class,
+						       seed_cairo_construct_context_from_drawable);
 
   seed_object_set_property (eng->context, namespace_ref, "Context", context_constructor_ref);
+  seed_object_set_property (eng->context, context_constructor_ref, "from_drawable", gdk_context_constructor_ref);
   
   return namespace_ref;
 }