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Re: [ft] FT_Open_Face

From: Ztatik Light
Subject: Re: [ft] FT_Open_Face
Date: Thu, 3 Oct 2013 21:48:56 -0500

I'm only trying one font, it's encrypted with OpenSSL which is why I'm using FT_Open_Face, to stream from SSL's decrypt I/O stream... One specific thing I don't understand for example is that it seems between each and every substantial read call, a read call with `count` and `offset` both 0 are called, and i'm not 100% sure what should be happening in that case.

On Thu, Oct 3, 2013 at 9:39 PM, suzuki toshiya <address@hidden> wrote:

I guess you're afraid that some bugs exist in the stream driver
of the FreeType2. You could load no font? Or, you could load
some fonts, but could not other fonts?

If FT_Open_Face() is already failed, the glyph loading should
not be tried anymore. According to fterrdef.h, error code 2
(from FT_Open_Face()) means the unknown font file format.
So... if you could load some fonts but could not load other,
please clarify the font file you've tried. If it's officially
provided freely (not piracy), or bundled to the widely available
products, no need to post the font file in this list, please
clarify how to access it.

If it's difficult (e.g. commercial font, or embedded font in
the confidential document etc), please try the tracing of FreeType2.
The method how to build the FreeType2 with debugging and tracing
message is written in doc/DEBUG.


On 10/04/2013 11:15 AM, Ztatik Light wrote:
> I'm having trouble implementing the read function passed into FT_Open_Face through it's `args` flags...
> Now, the function is being *called* correctly, because I put a print statement inside and see it printing out. It even reads some data. But FT_Open_Face returns 2, and the glyph loading fails...
> I suspect it has something to do with the case of `count` being 0 and it needing to seek.
> The doc mentions:
> "This function might be called to perform a seek or skip operation with a ‘count’ of 0."
> But . . . What if `offset` is also zero? Does this mean seek to beginning of the file, or just return 0?
> An example of an implemented read function with proper seeking and all would be the most beneficial in this case..
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