Microsoft KB Archive/111651

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BUG: GetGlyphOutline with GGO_BITMAP Fails with Large Scale

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Q111651

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
Calling GetGlyphOutline for a bitmap and passing a large X or Y scaling factor in the transformation matrix causes the return value to not properly track the bitmap size.

For example, Times New Roman Regular 72 point "1", with a scaling factor of 4.0 in eM11 of the transformation matrix, returns a black box of 100,64. This requires a bitmap of at least 800 bytes but GetGlyphOutline only returns 256. The native buffer is returned with no problems.

CAUSE
A 12-point font on a VGA is marked to use the rasterizer's scan converter. However, if the scaling indicated in the transform exceeds the outline threshold, GDI's "external" scan converter should be used. Unfortunately, that condition is not detected.

NOTE: This problem occurs only with bitmaps; outlines are fine with all transformation matrices.

STATUS
Microsoft has confirmed this to be a bug in Windows version 3.1.

Additional query words: buglist3.10 3.10 truetype font

Keywords : kbSDKWin16

Issue type : kbbug

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310