2.2.7.1.4.2 Revision 2 (TS_BITMAPCACHE_CAPABILITYSET_REV2)
The TS_BITMAPCACHE_CAPABILITYSET_REV2 structure is used to advertise support for Revision 2 bitmap caches ([MS-RDPEGDI] section 3.1.1.1.1). This capability is only sent from client to server.
In addition to specifying bitmap caching parameters in the Revision 2 Bitmap Cache Capability Set, a client MUST also support the MemBlt and Mem3Blt Primary Drawing Orders ([MS-RDPEGDI] sections 2.2.2.2.1.1.2.9 and 2.2.2.2.1.1.2.10, respectively) in order to receive the Cache Bitmap (Revision 2) Secondary Drawing Order ([MS-RDPEGDI] section 2.2.2.2.1.2.3).
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capabilitySetType |
lengthCapability |
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CacheFlags |
Pad2 |
NumCellCaches |
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BitmapCache0CellInfo |
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BitmapCache1CellInfo |
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BitmapCache2CellInfo |
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BitmapCache3CellInfo |
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BitmapCache4CellInfo |
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Pad3 |
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capabilitySetType (2 bytes): A 16-bit, unsigned integer. The type of the capability set. This field MUST be set to CAPSTYPE_BITMAPCACHE_REV2 (19).
lengthCapability (2 bytes): A 16-bit, unsigned integer. The length in bytes of the capability data, including the size of the capabilitySetType and lengthCapability fields.
CacheFlags (2 bytes): A 16-bit, unsigned integer. Properties which apply to all the bitmap caches.
-
Flag
Meaning
PERSISTENT_KEYS_EXPECTED_FLAG
0x0001
Indicates that the client will send a Persistent Key List PDU during the Connection Finalization phase of the RDP Connection Sequence (see section 1.3.1.1 for an overview of the RDP Connection Sequence phases).
ALLOW_CACHE_WAITING_LIST_FLAG
0x0002
Indicates that the client supports a cache waiting list. If a waiting list is supported, new bitmaps are cached on the second hit rather than the first (that is, a bitmap is sent twice before it is cached).
Pad2 (1 byte): An 8-bit, unsigned integer. Padding. Values in this field MUST be ignored.
NumCellCaches (1 byte): An 8-bit, unsigned integer. Number of bitmap caches (with a maximum allowed value of 5).
BitmapCache0CellInfo (4 bytes): A TS_BITMAPCACHE_CELL_CACHE_INFO structure. Contains information about the structure of Bitmap Cache 0. The maximum number of entries allowed in this cache is 600. This field is only valid if NumCellCaches is greater than or equal to 1.
BitmapCache1CellInfo (4 bytes): A TS_BITMAPCACHE_CELL_CACHE_INFO structure. Contains information about the structure of Bitmap Cache 1. The maximum number of entries allowed in this cache is 600. This field is only valid if NumCellCaches is greater than or equal to 2.
BitmapCache2CellInfo (4 bytes): A TS_BITMAPCACHE_CELL_CACHE_INFO structure. Contains information about the structure of Bitmap Cache 2. The maximum number of entries allowed in this cache is 65536. This field is only valid if NumCellCaches is greater than or equal to 3.
BitmapCache3CellInfo (4 bytes): A TS_BITMAPCACHE_CELL_CACHE_INFO structure. Contains information about the structure of Bitmap Cache 3. The maximum number of entries allowed in this cache is 4096. This field is only valid if NumCellCaches is greater than or equal to 4.
BitmapCache4CellInfo (4 bytes): A TS_BITMAPCACHE_CELL_CACHE_INFO structure. Contains information about the structure of Bitmap Cache 4. The maximum number of entries allowed in this cache is 2048. This field is only valid if NumCellCaches is equal to 5.
Pad3 (12 bytes): A 12-element array of 8-bit, unsigned integers. Padding. Values in this field MUST be ignored.