Microsoft KB Archive/130476

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Simulating Palette Animation on Non-Palette Displays

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Q130476

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The information in this article applies to:


 * Microsoft Win32 Application Programming Interface (API), used with:
 * Microsoft Windows NT Server version 3.5
 * Microsoft Windows NT Workstation version 3.5
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional

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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 Download Center:

"Lavalamp.exe" For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

"Q119591 How to Obtain Microsoft Support Files from Online Services" Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

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 kbOSWinNT350 kbOSWin2000 kbSDKWin32 kbGDIFAQ

Issue type : kbinfo

Technology : kbAudDeveloper kbWin32sSearch kbWin32API