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Re: [ft-devel] Fetching bitmap strike size from GlyphSlot

From: Behdad Esfahbod
Subject: Re: [ft-devel] Fetching bitmap strike size from GlyphSlot
Date: Fri, 21 Dec 2012 17:16:16 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0

On 12-12-21 05:15 PM, Behdad Esfahbod wrote:
> On 12-12-21 04:18 PM, Werner LEMBERG wrote:
>>>> FreeType doesn't return a 16ppem glyph image at 80ppem for a bitmap
>>>> font; this rather causes an error.
>>> Really?  Even with SFNT-based bitmap-only fonts?  That's definitely
>>> not what I'm observing.
>> *Blush* Oh!  Sounds like a bug.  Please send me a sample font.
> Really?  I'm not sure we are talking about the same thing...

Ok, looks like I'm fairly confused.  I'll go figure this out and report back.


>>>> Perhaps something like this untested code?
>>> Right.  That's what I was afraid of.  It's so hard planting that
>>> logic into a code otherwise using FreeType to load glyphs.  To
>>> contrast, all I need is a function to return the chosen strike.
>> It's not completely clear to me what you *exactly* want.  Can you give
>> more details?
>> An please have a look at function `FT_Match_Size' in `ftobjs.c'.  Does
>> this (or some similar code) fits your needs?  It should be
>> straightforward to add it to the public API.
> Right.  So, the above is not a bug.  cairo, pango, harfbuzz, etc all use
> FT_Set_Char_Size(), which does the size matching.  All I need to is to make
> the result available.
> Humm.  In fact, I now noticed that I probably can use the returned x_ppem /
> y_ppem to compare to my request and scale accordingly.  I think you just
> solved my problem!
> Cheers,
> behdad
>>     Werner


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