Re: CGContextSelectFont spinlock
Re: CGContextSelectFont spinlock
- Subject: Re: CGContextSelectFont spinlock
- From: Vince DeMarco <email@hidden>
- Date: Wed, 15 Sep 2010 16:33:31 -0700
On Sep 15, 2010, at 4:11 PM, Stevo Brock wrote:
> Apparently the "font system" was not initialized before this call. Putting a "[UIFont familyNames]" somewhere previous causes things to roll just fine.
>
> I should mention that this is an OpenGL based app with minimal other system UI.
>
> -Stevo Brock
> Head of Development
> Monkey Tools, LLC
> www.monkey-tools.com
>
>
This doesn't really matter but why are you doing this
CGContextSelectFont(context, [@"Comic Sans MS Bold" UTF8String], 24.0, kCGEncodingMacRoman);
Why not just
CGContextSelectFont(context, "Comic Sans MS Bold", 24.0, kCGEncodingAscii);
I changed the encoding from MacRoman to Ascii since it is actually ascii.
You are creating a Constant NSString with the @"" then turning around and asking it for the UTF8 representation of that, which is the same as what i just typed above.
Vince
>
>
> On Sep 15, 2010, at 1:49 PM, Stevo Brock wrote:
>
>> I'm trying to add some custom font support to an iPad app and I keep running into a spinlock from CGContextSelectFont.
>>
>> Happens on SDK 4.0 Simulator and Device running 3.2.2. I've narrowed down the code to:
>>
>> CGContextRef context = CGBitmapContextCreate(&data, 1, 1, 8, 4, CGColorSpaceCreateDeviceRGB(),
>> kCGImageAlphaPremultipliedLast);
>> CGContextSelectFont(context, [@"Comic Sans MS Bold" UTF8String], 24.0, kCGEncodingMacRoman);
>> CGContextRelease(context);
>>
>> Depending on where I put this code, sometimes it runs through just fine and sometimes it spinlocks. The stack trace is just:
>>
>> 0: __spin_lock
>> 1: ??
>>
>> Where is it legal to call this function and why would it spin lock elsewhere? Help!
>>
>> -Stevo Brock
>> Head of Development
>> Monkey Tools, LLC
>> www.monkey-tools.com
>>
>>
>>
>>
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