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: Andreas Falkenhahn <email@hidden>
- Date: Thu, 01 Sep 2016 15:38:38 +0200
On 01.09.2016 at 10:00 Alastair Houghton wrote:
> 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)?)
That returns 0, that's why I was using 1.
--
Best regards,
Andreas Falkenhahn mailto:email@hidden
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