Microsoft KB Archive/111729

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BUG: StretchBlt Does Not Perform Palette Translations

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Q111729

3.10 WINDOWS kbprg kbbuglist

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
Normally, the StretchBlt function performs a palette translation when the destination and source bitmaps do not contain the same color format or palette. When the destination rectangle is the exact size of the source rectangle (no stretching is performed), the palette translation is not performed.

CAUSE
When the destination and source rectangles are the same size, no stretching is performed and BitBlt is called to perform a straight copy of the source to the destination. BitBlt does not perform the palette translation that StretchBlt() does.

RESOLUTION
You can force StretchBlt to not call BitBlt by changing one of the destination rectangle coordinates by one unit. Then, the palette translation will be performed.

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION
This problem does not occur in Windows NT version 3.1.

Additional query words: buglist3.10 3.10

Keywords : kbOSWin310 _IK kbSDKWin16

Issue type : kbbug

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310