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Re: [ft] bitmap_left description


From: Werner LEMBERG
Subject: Re: [ft] bitmap_left description
Date: Sat, 27 Sep 2014 06:25:47 +0200 (CEST)

> The docs for bitmap_left say:
> 
>     This is the bitmap's left bearing expressed in integer
>     pixels. Of course, this is only valid if the format is
>     FT_GLYPH_FORMAT_BITMAP.
> 
> I'm rendering individual glyphs from a TrueType font using
> FT_Load_Glyph() followed by FT_Render_Glyph().  Having done that I
> had been struggling to work out the metrics for the result.  Then I
> discovered that bitmap_left and bitmap_top seem to tell me exactly
> what I need to know - but I had been avoiding them because this not
> a bitmap font and the description quoted above.

Well, after calling FT_Render_Glyph, `face->glyph' *does* hold a
bitmap, as specified by the `face->glyph->format' field.  Please read
the documentation of its type, `FT_GlyphSlotRec'.

> Is it OK to use bitmap_left/top after FT_Render_Glyph()?

Yes.

> Is this a documentation issue?

Obviously.  Please suggest an improvement.


    Werner



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