[Bug 20420] VB6 Font size problem with custom usercontrols

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20420

--- Comment #15 from Jeff Laughlin <jeff.laughlin at gmail.com> 2010-12-09 04:53:52 CST ---
Created an attachment (id=32421)
 --> (http://bugs.winehq.org/attachment.cgi?id=32421)
Fixes this bug, I hope.

Fixes font scaling in oleaut32, and hopefully
 http://bugs.winehq.org/show_bug.cgi?id=20420.

The factors leading to tiny unreadable fonts include
1. Poor font selection in the first place. Please don't even try to use 8 or 9
   point fonts.
2. Badly behaved Ole components that don't call SetRatio to set the screen
   resolution for the fonts they use.
3. olefonts.c hard coded a default screen resolution of 72 dpi.

The crux of this patch changes the hard coded default resolution in
OLEFontImpl_Construct from 72 to 0 dpi. Apps that call SetRatio override this.
Apps that dont, well the maths used to calculate the desired font size then
calculates a font size of zero. Windows (or Wine) will not render a zero point
font, but will select a reasonable size to use instead.

I have also revised the maths in realize_font() to operate as suggested in
http://msdn.microsoft.com/en-us/library/dd145037%28v=VS.85%29.aspx

See also http://msdn.microsoft.com/en-us/library/ms691214%28v=VS.85%29.aspx

Tested on RHEL 6b2.

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