[gjs/cairo] [cairo] Implement Context constructor

[Johan Dahlin <johan src gnome org>]

commit d8ab7e98bbadcbc015488c6296c6dddd61706003
Author: Johan Dahlin <johan gnome org>
Date:   Wed Feb 17 20:20:40 2010 -0200

    [cairo] Implement Context constructor

 modules/cairo-context.c       |   21 +++++++++++++++++++++
 modules/cairo-image-surface.c |   11 +++++++++++
 modules/cairo-private.h       |    4 ++++
 3 files changed, 36 insertions(+), 0 deletions(-)
---
diff --git a/modules/cairo-context.c b/modules/cairo-context.c
index e857791..c853f7c 100644
--- a/modules/cairo-context.c
+++ b/modules/cairo-context.c
@@ -30,6 +30,7 @@ typedef struct {
     void *dummy;
     JSContext  *context;
     JSObject   *object;
+    cairo_t * cr;
 } GjsCairoContext;
 
 static struct JSClass gjs_js_cairo_context_class;
@@ -66,6 +67,24 @@ cairo_context_constructor(JSContext *context,
                           jsval     *retval)
 {
     GjsCairoContext *priv;
+    JSObject *surface_wrapper;
+    cairo_surface_t *surface;
+    cairo_t *cr;
+
+    if (!gjs_parse_args(context, "Context", "o", argc, argv,
+                        "surface", &surface_wrapper))
+        return JS_FALSE;
+
+    surface = gjs_cairo_image_surface_get_surface(context, surface_wrapper);
+    if (!surface)
+        return JS_FALSE;
+
+    cr = cairo_create(surface);
+    if (cairo_status(cr) != CAIRO_STATUS_SUCCESS) {
+        /* FIXME: set cairo exception properly */
+        fprintf(stderr, "FIXME set exception");
+        return JS_FALSE;
+    }
 
     priv = g_slice_new0(GjsCairoContext);
 
@@ -74,6 +93,7 @@ cairo_context_constructor(JSContext *context,
 
     priv->context = context;
     priv->object = obj;
+    priv->cr = cr;
 
     return JS_TRUE;
 }
@@ -87,6 +107,7 @@ cairo_context_finalize(JSContext *context,
     if (priv == NULL)
         return;
 
+    cairo_destroy(priv->cr);
     g_slice_free(GjsCairoContext, priv);
 }
 
diff --git a/modules/cairo-image-surface.c b/modules/cairo-image-surface.c
index 5f32c49..99f2e86 100644
--- a/modules/cairo-image-surface.c
+++ b/modules/cairo-image-surface.c
@@ -172,3 +172,14 @@ gjs_cairo_image_surface_create_proto(JSContext *context)
     return cairo_image_surface;
 }
 
+cairo_surface_t *
+gjs_cairo_image_surface_get_surface(JSContext *context,
+                                    JSObject *object)
+{
+    GjsCairoImageSurface *priv;
+    priv = priv_from_js(context, object);
+    if (priv == NULL)
+        return NULL;
+    return priv->surface;
+}
+
diff --git a/modules/cairo-private.h b/modules/cairo-private.h
index 7c471ed..0c2381f 100644
--- a/modules/cairo-private.h
+++ b/modules/cairo-private.h
@@ -23,11 +23,15 @@
 #ifndef __CAIRO_PRIVATE_H__
 #define __CAIRO_PRIVATE_H__
 
+#include <cairo.h>
+
 JSBool gjs_js_define_cairo_stuff(JSContext      *context,
                                  JSObject       *module_obj);
 
 jsval gjs_cairo_context_create_proto(JSContext *context);
 jsval gjs_cairo_image_surface_create_proto(JSContext *context);
+cairo_surface_t * gjs_cairo_image_surface_get_surface(JSContext *context,
+                                                      JSObject *object);
 
 #endif /* __CAIRO_PRIVATE_H__ */