Sharing DirectDraw applications using application based screen sampling

• US 20030085922A1
• Filed: 04/13/2001
• Published: 05/08/2003
• Est. Priority Date: 04/13/2001
• Status: Abandoned Application

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Wei, Songxiang
• Application Number:
  US09/835,086
• Publication Number:
  US 20030085922A1
• Time in Patent Office: Days
• US Class Current: 345/751
• 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: G09G 5/14 Display of multiple viewports

Abstract

A method for sharing an application is disclosed. The method includes determining a position and a size of a non-DirectDraw region of a shared application window by monitoring function calls made by the application, determining a position and a size of an DirectDraw region of a shared application window by monitoring by monitoring a DirectDraw COM interface, and capturing a screen shot of an image corresponding to the non-DirectDraw and the DirectDraw regions of the shared application window.

Claims

1. A method for sharing an application, the method comprising:

determining a position and a size of a non-DirectDraw region of a shared application window by monitoring function calls made by the application;

determining a position and a size of an DirectDraw region of a shared application window by monitoring a DirectDraw COM interface; and

capturing a screen shot of an image corresponding to the non-DirectDraw and the DirectDraw regions of the shared application window;

wherein the position and the size of the non-DirectDraw region and the position and the size of the DirectDraw region define a position and a size of the shared application window.

2. The method of claim 1 further comprising:

transmitting the position and the size of the shared application window to a viewer.

3. The method of claim 1 further comprising:

transmitting the screen shot to a viewer.

4. The method of claim 1 further comprising:

determining a position and a size of a non-shared application window by monitoring function calls made by the non-shared application; and

if the non-shared application window overlaps the shared application window, determining a position and a size of an overlapping region.

5. The method of claim 4 further comprising:

transmitting the overlapping region to a viewer.

6. The method of claim 1 further comprising:

determining whether the position or the size of the shared application window has changed by monitoring function calls made by the shared application; and

if the position or the size of the shared application window has changed, determining a new position and/or a new size of the shared application window.

7. The method of claim 1 further comprising:

periodically capturing the image corresponding to the shared application window.

8. The method of claim 7 further comprising:

periodically transmitting the captured image to the viewer.

9. A computer-readable storage medium storing a computer program executable by a computer, the computer program comprising computer instructions for:

determining a position and a size of a non-DirectDraw region of a shared application window by monitoring function calls made by the application;

determining a position and a size of an DirectDraw region of a shared application window by monitoring by monitoring a DirectDraw COM interface; and

capturing a screen shot of an image corresponding to the non-DirectDraw and the DirectDraw regions of the shared application window;

wherein the position and the size of the non-DirectDraw region and the position and the size of the DirectDraw region define a position and a size of the shared application window.

10. The computer readable storage medium of claim 9 further comprising computer instructions for:

transmitting the position and the size the shared application window to a viewer.

11. The computer readable storage medium of claim 9 further comprising computer instructions for:

transmitting the screen shot to a viewer.

12. The computer readable storage medium of claim 9 further comprising computer instructions for:

determining a position and a size of a non-shared application window by monitoring function calls made by the non-shared application; and

if the non-shared application window overlaps the shared application window, determining a position and a size of an overlapping region.

13. The computer readable storage medium of claim 12 further comprising computer instructions for:

transmitting the overlapping region to a viewer.

14. The computer readable storage medium of claim 9 further comprising computer instructions for:

determining whether the position or the size of the shared application window has changed by monitoring function calls made by the shared application; and

if the position or the size of the shared application window has changed, determining a new position and/or a new size of the shared application window.

15. The computer readable storage medium of claim 9 further comprising computer instructions for:

periodically capturing the image corresponding to the shared application window.

16. The computer readable storage medium of claim 15 further comprising computer instructions for:

periodically transmitting the captured image to the viewer.

17. A data conferencing system comprising:

a presenter computer connected to one or more server computers via a global area network;

a viewer computer connected to the one or more server computers via the global area computer network; and

a computer program executable by the presenter computer, wherein the computer program comprises computer instructions for;

determining a position and a size of a non-DirectDraw region of a shared application window by monitoring function calls made by the application;

determining a position and a size of an DirectDraw region of a shared application window by monitoring by monitoring a DirectDraw COM interface; and

capturing a screen shot of an image corresponding to the non-DirectDraw and the DirectDraw regions of the shared application window;

wherein the position and the size of the non-DirectDraw region and the position and the size of the DirectDraw region define a position and a size of the shared application window.

18. The data conferencing system of claim 17 further comprising computer instructions for:

transmitting the position and the size of the shared application window to a viewer computer.

19. The data conferencing system of claim 17 further comprising computer instructions for:

transmitting the screen shot to the viewer computer.

20. The data conferencing system of claim 17 further comprising computer instructions for:

determining a position and a size of a non-shared application window by monitoring function calls made by the non-shared application; and

if the non-shared application window overlaps the shared application window, determining a position and a size of an overlapping region.

21. The data conferencing system of claim 20 further comprising computer instructions for:

transmitting the overlapping region to a viewer.

22. The data conferencing system of claim 17 further comprising computer instructions for:

determining whether the position or the size of the shared application window has changed by monitoring function calls made by the shared application; and

if the position or the size of the shared application window has changed, determining a new position and/or a new size of the shared application window.

23. The data conferencing system of claim 17 further comprising computer instructions for:

periodically capturing the image corresponding to the shared application window.

24. The data conferencing system of claim 23 further comprising computer instructions for:

periodically transmitting the captured image to the viewer computer.