1.5 Prerequisites/Preconditions

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All multiple-byte fields within a message are assumed to contain data in little-endian byte order unless otherwise specified.

The following client prerequisites are mandatory:

  • The client MUST advertise support for the NSCodec codec by sending the NSCodec Capability Set (section 2.2.1) to the server as specified in section 3.1.5.1.

  • The client MUST support a color depth of 32 bits per pixel. This means that the RNS_UD_32BPP_SUPPORT (0x0008) flag must be set in the supportedColorDepths field of the Client Core Data structure ([MS-RDPBCGR] section 2.2.1.3.2).

In order to receive NSCodec-compressed bitmaps within the Stream Surface Bits Surface Command ([MS-RDPBCGR] section 2.2.9.2.2), the following client prerequisites are mandatory:

  • The client MUST support fast-path graphics output ([MS-RDPBCGR] section 2.2.9.1.2) and acknowledge this support by specifying the FASTPATH_OUTPUT_SUPPORTED (0x0001) flag in the General Capability Set ([MS-RDPBCGR] section 2.2.7.1.1).

  • The client MUST support the Stream Surface Bits Surface Command ([MS-RDPBCGR] section 2.2.9.2.2). Support for this surface command MUST be advertised in the Surface Commands Capability Set ([MS-RDPBCGR] section 2.2.7.2.9).

In order to use NSCodec-compressed bitmaps in conjunction with Bitmap Cache Secondary Drawing Orders ([MS-RDPEGDI] sections 1.3.1.1 and 1.3.1.2.2), the following client prerequisite is mandatory:

  • The client MUST support the Cache Bitmap - Revision 3 ([MS-RDPEGDI] section 2.2.2.2.1.2.8) Secondary Drawing Order. Support for this caching order MUST be advertised in the Surface Commands Capability Set ([MS-RDPBCGR] section 2.2.7.2.9).