3.2.5.1.3.1 Processing Alternate Secondary Drawing Orders
All alternate secondary drawing orders are identified by the Alternate Secondary Drawing Order Header (section 2.2.2.2.1.3.1.1) and are used to manage offscreen and NineGrid bitmaps and to transport opaque GDI+ 1.1 records:
The Create Offscreen Bitmap (see section 3.2.5.1.3.1.1) and Switch Surface (see section 3.2.5.1.3.1.2) Alternate Secondary Drawing Orders are used to manipulate the bitmaps in the Offscreen Bitmap Cache (see section 3.1.1.1.5).
The Create NineGrid Bitmap (see section 3.2.5.1.3.1.3) and Stream Bitmap (see section 3.2.5.1.3.1.4) Alternate Secondary Drawing Orders are used to manipulate the bitmaps in the NineGrid Bitmap Cache (see section 3.1.1.1.6).
The GDI+ Alternate Secondary Drawing Orders (see section 2.2.2.2.1.3.6) are used to transport opaque GDI+ 1.1 records for processing or placement in the GDI+ Caches (see section 3.1.1.1.7).
If the client has not advertised support for a particular cache type or feature, it SHOULD ignore any alternate secondary and primary drawing orders associated with that cache or feature, if they are sent by the server.