Palette management for application sharing in collaborative systems

• US 5,608,426 A
• Filed: 09/28/1993
• Issued: 03/04/1997
• Est. Priority Date: 09/28/1993
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Hester, John
• Primary Examiner(s): Donaghue, Larry D.
• Assistant Examiner(s): Rinehart, Mark H.
• Application Number:
  US08/128,014
• Time in Patent Office: 1,253 Days
• Field of Search: 340/721, 395/200, 395/200.04, 395/131, 364/514, 345/153, 345/2
• US Class Current: 345/600
• 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 5/06 using colour palettes, e.g. look-up tables

Abstract

A method and apparatus for managing palettes in collaborative systems. This includes one or more host computers connected to one or more remote computers, wherein an image displayed on the host computer is substantially simultaneously displayed on the remote computer. The invention recognizes when a change is made to a system palette on the host computer, and communicates those changes to the remote computer. A logical palette is created on the remote computer to reflect the system palette on the host computer, and the changes made therein. A system palette on the remote computer may be updated to reflect the logical palette, and the changes made therein, depending upon whether the collaborative system is active or idle. When sharing images between the host computer and the remote computer, the images must first be translated from their device dependent format using the system palette on the host computer into a device independent image. The device independent image, like the system palette, is transmitted from the host computer to the remote computer. The device independent image is then translated into a device dependent image suitable for display on the remote computer using the logical palette maintained by the collaborative system on the remote computer.

Claims

1. In a collaborative system comprising one or more host computers connected to one or more remote computers, the host computer and remote computer each having a system palette, a hardware palette, means for accessing the system palette and hardware palette, and means for updating the hardware palette using the system palette, wherein an image displayed on the host computer is substantially simultaneously displayed on the remote computer, a method of managing palettes used in the image, comprising the steps of:

(a) recognizing when a change is made to the system palette on the host computer;

(b) transmitting the changed system palette from the host computer to the remote computer;

(c) creating a logical palette on the remote computer to reflect the changed system palette received from the host computer; and

(d) selectively updating the system palette on the remote computer to reflect the logical palette created on the remote computer.

2. The invention as set forth in claim 1 above, wherein the selectively updating step (d) comprises the step of replacing the system palette on the remote computer with the logical palette when the collaborative system is active on the remote computer.

3. The invention as set forth in claim 2 above, wherein the selectively updating step (d) comprises the step of selectively replacing the system palette on the remote computer with the logical palette when the collaborative system is idle on the remote computer.

4. The invention as set forth in claim 1 above, further comprising the steps of:

intercepting an image displayed on the host computer;

intercepting functions that alter the image on the host computer;

selectively communicating the intercepted image and intercepted functions to the remote computer;

selectively displaying the intercepted image on the remote computer; and

altering the intercepted image according to the intercepted functions.

5. The invention as set forth in claim 4 above, further comprising the steps of:

translating a first device dependent image suitable for display on the host computer into a device independent image using the system palette on the host computer;

transmitting the device independent image to the remote computer;

translating the device independent image into a second device dependent image suitable for display on the remote computer using the logical palette on the remote computer; and

displaying the second device dependent image.

6. A collaborative system comprising:

(a) one or more host computers connected to one or more remote computers, the host computer and remote computer each having a system palette, a hardware palette, means for accessing the system palette and hardware palette, and means for updating the hardware palette using the system palette;

(b) means for recognizing when a change is made to the system palette on the host computer;

(c) means for transmitting the system palette from the host computer to the remote computer;

(d) means for creating a logical palette on the remote computer to reflect the system palette received from the host computer; and

(e) means for selectively updating the system palette on the remote computer to reflect the logical palette created on the remote computer.

7. The invention as set forth in claim 6 above, wherein the means for selectively updating comprises means for replacing the system palette on the remote computer with the logical palette when the collaborative system is active on the remote computer.

8. The invention as set forth in claim 7 above, wherein the means for selectively updating comprises means for selectively replacing the system palette on the remote computer with the logical palette when the collaborative system is idle on the remote computer.

9. The invention as set forth in claim 6 above, further comprising:

means for intercepting an image displayed on the host computer;

means for intercepting functions that alter the image on the host computer;

means for selectively communicating the intercepted image and intercepted functions to the remote computer;

means for selectively displaying the intercepted image on the remote computer; and

means for altering the intercepted image according to the intercepted functions.

10. The invention as set forth in claim 9 above, further comprising:

means for translating a first device dependent image suitable for display on the host computer into a device independent image using the system palette on the host computer;

means for transmitting the device independent image to the remote computer;

means for translating the device independent image into a second device dependent image suitable for display on the remote computer using the logical palette on the remote computer; and

means for displaying the second device dependent image.