A METHOD AND APPARATUS FOR UPDATING A GRAPHICAL DISPLAY IN A DISTRIBUTED PROCESSING ENVIRONMENT USING COMPRESSION

• US 20060203007A1
• Filed: 03/14/2005
• Published: 09/14/2006
• Est. Priority Date: 03/14/2005
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Bullard, Justin, Opferman, Toby
• Granted Patent: US 8,423,673 B2
• Time in Patent Office: Days
• US Class Current: 345/619
• CPC Class Codes: G06F 3/1454 involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
• CPC Class Codes: G06T 3/00 Geometric image transformations in the plane of the image
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 2350/00 Solving problems of bandwidth in display systems

Abstract

A system and method for updating a remote display unit that communicates with a computing system are described. The method includes accessing display update information from an update queue that stores drawing commands issued by an application executing on the computing system, caching the display update information, applying a lossy compression algorithm to the display update information to create a lossy display update, and transmitting the lossy update to the remote display. The method also includes applying a lossless compression algorithm to the display update information in the cache to create a lossless display update and transmitting the lossless display update a predetermined of time after transmitting the lossy update.

Claims

1. A method of updating a remote display unit in communication with a computing system comprising:

(a) accessing display update information from an update queue storing drawing commands issued by an application executing on the computing system;

(b) caching the display update information;

(c) applying a lossy compression algorithm to the display update information to create a lossy display update;

(d) transmitting the lossy update to the remote display;

(e) applying a lossless compression algorithm to the display update information in the cache to create a lossless display update;

(f) transmitting the lossless display update a predetermined of time after transmitting the lossy update.

2. The method of claim 1 further comprising setting the operational mode of the computing system.

3. The method of claim 1 further comprising determining if the display update information has been previously transmitted to the remote display unit.

4. The method of claim 3 further comprising signal the remote display unit the update information has been previously transmitted.

7. The system of claim 1 further comprising a cache for determining if the display update information has been previously transmitted to the remote display unit.

8. The system of claim 3 further comprising a transmitter for signal the remote display unit to indicate that the update information has been previously transmitted.

5. A system for updating a display unit remotely located from a computing system comprising:

a queue storing at least one system drawing call representative of a graphical output of an application program executing on the computer system;

a cache storing the at least one drawing call;

a thread accessing the queue and executing a lossy compression algorithm on the at least one drawing call of the queue to generate a lossy display update and accessing the cache and executing a lossless compression algorithm on the at least one drawing call of the cache to generate a lossless display update; and

a driver transmitting the lossy display update to the remote display unit, waiting a predetermined time period, and transmitting the lossless display update after the expiration of the predetermined time period.

6. The system of claim 5 further comprising a flag for setting the operational mode of the computing system.

9. A system for updating a display unit remotely located from a computing system comprising:

queue means for storing at least one system drawing call representative of a graphical output of an application program executing on the computer system;

cache means for storing a copy of the at least one drawing command;

thread means for accessing the queue and executing a lossy compression algorithm on the at least one drawing call of the queue to generate a lossy display update and for accessing the cache and executing a lossless compression algorithm on the at least one drawing command of the cache to generate a lossless display update; and

drive means for transmitting the lossy display update to the remote display unit, waiting a predetermined time period, and transmitting the lossless display update after the expiration of the predetermined time period.

10. The system of claim 9 further comprising means for setting the operational mode of the computing system.

11. The system of claim 9 further comprising means for determining if the display update information has been previously transmitted to the remote display unit.

12. The system of claim 11 further comprising means for signal the remote display unit the update information has been previously transmitted.