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Re: Pixel-perfect migration from ATSUI to Core Text
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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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