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Re: [ft] BDF/PCF SetPixelSizes behavior changed?

From: Werner LEMBERG
Subject: Re: [ft] BDF/PCF SetPixelSizes behavior changed?
Date: Sun, 03 Apr 2005 10:09:55 +0200 (CEST)

> I just updated to current CVS and observed a changed behavior in 
>               err := FT.SetPixelSizes(font.face, 0, ptsize);
> which fails and returns error 23 when called with ptsize = 12 for
> the font below.  ftview appears to have the same problem but can
> display the font if the point size is adjusted to 15.
> What is correct and why?

[Thanks for the font!]

The method how a bitmap font is accessed has been refined and
synchronized.  Formerly, FT_Set_Pixel_Sizes and FT_Set_Char_Size were
synonyms in FreeType's BDF and PCF interface.  This has changed now.
FT_Set_Pixel_Sizes should be used to select the actual font dimensions
(the `strike', which is 15 in your case: FONT_ASCENT+FONT_DESCENT),
while FT_Set_Char_Size selects the `nominal' size (the PIXELSIZE
property which is 12 in your case).

I'll fix the documentation to avoid confusion.


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