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Re: [ft] The fastest way to query size of a rendered bitmap
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From: |
Lawrence D'Oliveiro |
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Subject: |
Re: [ft] The fastest way to query size of a rendered bitmap |
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Date: |
Sat, 16 Sep 2017 09:14:13 +1200 |
On Fri, 15 Sep 2017 20:30:02 +0300, Daniel Plakhotich wrote:
> But I'm a bit confused by The FreeType Tutorial (II. Managing
> Glyphs: 4. Simple Text Rendering: Kerning and Centering), which says:
>
>> In general, the above function does not compute an exact bounding
>> box of a string! As soon as hinting is involved, glyph dimensions
>> must be derived from the resulting outlines. For anti-aliased
>> pixmaps, FT_Outline_Get_BBox then yields proper results. In case
>> you need 1-bit monochrome bitmaps, it is even necessary to actually
>> render the glyphs because the rules for the conversion from outline
>> to bitmap can also be controlled by hinting instructions.
>
> Why it says the rendering is necessary for 1-bit bitmaps, but not
> 8-bit? Maybe I missed something?
Perhaps because hinting is more important when you don’t have
anti-aliasing as well.