Re: Pixel-perfect migration from ATSUI to Core Text
Re: Pixel-perfect migration from ATSUI to Core Text
- Subject: Re: Pixel-perfect migration from ATSUI to Core Text
- From: Alastair Houghton <email@hidden>
- Date: Thu, 01 Sep 2016 09:00:56 +0100
On 31 Aug 2016, at 19:24, Andreas Falkenhahn <email@hidden> wrote:
>
> On 31.08.2016 at 20:08 Alastair Houghton wrote:
>
>> On 31 Aug 2016, at 15:52, Andreas Falkenhahn <email@hidden> wrote:
>
>>> But I still don't understand how computing glyph positioning manually
>>> should work around the fact that there are no APIs that measure the text
>>> like ATSUI. I mean, internally, CTLineGetOffsetForStringIndex() probably
>>> does exactly that, it returns the positioning obtained from CTRunGetAdvances().
>
>> You need to get the advances of individual glyphs, and sum the rounded values.
>
> Look at the example code I posted. It's just a single glyph in the string.
> The string is just a "W”.
The problem is most likely that the “W” doesn’t start at x = 0 (have you tried calling CTLineGetOffsetForStringIndex(line, 0, NULL)?)
Kind regards,
Alastair.
--
http://alastairs-place.net
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