Simulating Palette Animation on Non-Palette Displays

ID: Q130476

The information in this article applies to:

Microsoft Win32 Application Programming Interface (API), used with:
- Microsoft Windows NT 3.5

SUMMARY

LAVALAMP is a sample application in the Microsoft Software Library that demonstrates how to simulate the effects of the AnimatePalette() function on devices that may not support palettes. This program also demonstrates how to create and manipulate dibsections. The following dibsection functions are used in LAVALAMP:

CreateDIBSection()

GetDIBColorTable()

SetDIBColorTable()

MORE INFORMATION

The following file is available for download from the Microsoft Software Library:

~ LAVALAMP.EXE

For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:

Q119591 How to Obtain Microsoft Support Files from Online Services

When running in display modes that are not palette-based, many of the effects that can be performed easily with palette animation need to be reprogrammed. A simple method of simulating palette animation can be achieved by "animating" a device-independent bitmap's (DIBs) color table and redisplaying the DIB with the new colors. To demonstrate this technique, LAVALAMP creates an 8-bits-Per-Pixel (bpp) dibsection. Then it shifts each of the RGBQUAD data structures in the color table by one position to the left, and recycles the first entry in the color table to the last position. After each modification to the color table, the DIB is redisplayed.

Because the entire DIB must be redisplayed after each modification to the color table, this technique is not recommended for large bitmaps.

Additional query words: technote BMP softlib kbgraphic kbfile


Keywords          : kbfile kbgraphic kbNTOS350 kbSDKWin32 
Version           : winnt:3.5
Platform          : winnt 
Issue type        : kbinfo

Last Reviewed: June 21, 1999