Microsoft KB Archive/111863

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BUG: Driver vs. GDI-Simulated Styled Lines Don't Match

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Q111863

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
Lines drawn using the same styled pen may appear slightly different. For example, when drawing styled lines with the R2_XORPEN raster operation to draw and remove lines quickly, some pixels may be left behind.

CAUSE
GDI's styled line simulation does not match pixel-for-pixel the display driver's styled line drawing. Styled lines are drawn either by GDI or by the display driver depending on the driver's line and clipping capabilities. Even if a driver supports styled lines, it may not handle styled lines when clipping is involved. In the situations not handled by the driver, GDI will simulate the styled line, thus exhibiting differences in pixels.

STATUS
Microsoft has confirmed this to be a bug in Microsoft Windows version 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: buglist3.10 3.10

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Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310