GeglBuffer *
gegl_graph_get_shared_empty (GeglGraphTraversal *path)
{
if (!path->shared_empty)
{
path->shared_empty = gegl_buffer_new_ram (GEGL_RECTANGLE (0, 0, 0, 0),
gegl_babl_rgba_linear_float ());
gegl_object_set_has_forked (G_OBJECT (path->shared_empty));
}
return path->shared_empty;
}
GeglBuffer *
gegl_operation_context_get_target (GeglOperationContext *context,
const gchar *padname)
{
GeglBuffer *output;
const GeglRectangle *result;
const Babl *format;
GeglNode *node;
GeglOperation *operation;
#if 0
g_return_val_if_fail (GEGL_IS_OPERATION_CONTEXT (context), NULL);
#endif
operation = context->operation;
node = operation->node; /* <ick */
format = gegl_operation_get_format (operation, padname);
if (format == NULL)
{
g_warning ("no format for %s presuming RGBA float\n",
gegl_node_get_debug_name (node));
format = babl_format ("RGBA float");
}
g_assert (format != NULL);
g_assert (!strcmp (padname, "output"));
result = &context->result_rect;
if (result->width == 0 ||
result->height == 0)
{
output = g_object_ref (emptybuf());
}
else if (node->dont_cache == FALSE &&
! GEGL_OPERATION_CLASS (G_OBJECT_GET_CLASS (operation))->no_cache)
{
GeglBuffer *cache;
cache = GEGL_BUFFER (gegl_node_get_cache (node));
/* Only use the cache if the result is within the cache
* extent. This is certainly not optimal. My gut feeling is that
* the current caching mechanism needs to be redesigned
*/
if (gegl_rectangle_contains (gegl_buffer_get_extent (cache), result))
{
output = g_object_ref (cache);
}
else
{
output = gegl_buffer_new_ram (result, format);
}
}
else
{
output = gegl_buffer_new_ram (result, format);
}
gegl_operation_context_take_object (context, padname, G_OBJECT (output));
return output;
}
