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Re: [ft] How to generate a glyph bitmap of a specific pixel size using F
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From: |
Werner LEMBERG |
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Subject: |
Re: [ft] How to generate a glyph bitmap of a specific pixel size using FT_Set_Pixel_Sizes |
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Date: |
Mon, 09 Jun 2014 23:21:36 +0200 (CEST) |
> I'm not very clear on what the parameters of `FT_Request_Size'
> represent and what this function does. This function appears to be
> some kind of maximum size for the glyph.
It sets scaling values for a font roughly based on the hypothetical EM
square. Basically, a request for a given size returns the font
designer's idea of this size, nothing more.
> Actually, I am just wondering what I should do if I want to generate
> a glyph *of exactly a specific bounding size*. Does this function
> meet my need?
No. Such a function *does not exist*! Due to hinting, the exact bbox
of a glyph is unpredictable for many glyph formats without actually
rendering the glyph.
I can only repeat: You have to apply trial and error to get what you want.
Werner