3.3.5.1.1.1.17 Construction of PolygonCB
The structure and fields of the PolygonCB Primary Drawing Order are specified in section 2.2.2.2.1.1.2.17. The order fields MUST be populated in accordance with this description and the instructions detailed in section 3.3.5.1.1.1.
If a cached brush is specified in this order, that brush MUST be sent to the client before this order is dispatched by using a Cache Brush Secondary Drawing Order (see section 3.3.5.1.2.1.6). (The client specifies support for brush caching using the Brush Capability Set defined in [MS-RDPBCGR] section 2.2.7.1.7.)
The PolygonCB Order MUST NOT be sent to the client if support for it was not specified in the Order Capability Set (see [MS-RDPBCGR] section 2.2.7.1.3).