Re: Hang in font panel with certain fonts

[Fred Kiefer]

I just went through the whole code another time and noticed that I
overlooked that chance of getting a loop because of macros. You should
also add log statements before and after all macro calls especially
around calls to WANT_LINE_HEIGHT.

Fred

Am 17.01.2015 um 11:50 schrieb Fred Kiefer:
> Not being able to debug this is bad. Eric's idea was of course the best way 
> to do this, but now we have to fall back to my last suugestion, that you seem 
> to have forgotten. What I would do is scatter around NSLog statements in the 
> whole loop to find out where the iteration is happening. Add one log before 
> and after the loop and one at the beginning and another at the end and more 
> every ten lines in the loop. This is really a brute force attempt and if you 
> are unlucky it will again make the code work without giving you further 
> information.
> 
> The other way to track down usages of uninitialized data is to use valgrind. 
> But this is rather hard for you to do if you have no experiance with that 
> tool.
> 
> Most likely the glyph width of zero is the underlying problem, but we still 
> need to see how this affects the code.
> 
> Fred
> 
> On the road
> 
> Am 17.01.2015 um 10:52 schrieb Riccardo Mottola <riccardo.mottola@libero.it>:
> 
>> Hi,
>>
>> Fred Kiefer wrote:
>>> All of this is based on the asumption that the "Main glyph layout loop. i:" 
>>> output comes from inside the main loop, that is from below line 732.
>> that was try as I wrote. Since with debug symbols everything works, this is 
>> the "end" of the loop when it works:
>>
>>
>> 2015-01-17 10:42:54.735 Ink[2050] Main glyph layout loop. i:15
>> 2015-01-17 10:42:54.737 Ink[2050] glyph size 6.857143 0.000000
>> 2015-01-17 10:42:54.739 Ink[2050] moving to next glyph
>> 2015-01-17 10:42:54.740 Ink[2050] Main glyph layout loop. i:16
>> 2015-01-17 10:42:54.742 Ink[2050] glyph size 6.857143 0.000000
>> 2015-01-17 10:42:54.744 Ink[2050] moving to next glyph
>> 2015-01-17 10:42:54.746 Ink[2050] Main glyph layout loop. i:17
>> 2015-01-17 10:42:54.748 Ink[2050] glyph size 6.857143 0.000000
>> 2015-01-17 10:42:54.750 Ink[2050] moving to next glyph
>> 2015-01-17 10:42:54.752 Ink[2050] Main glyph layout loop. i:18
>> 2015-01-17 10:42:54.753 Ink[2050] glyph size 6.857143 0.000000
>> 2015-01-17 10:42:54.755 Ink[2050] moving to next glyph
>> 2015-01-17 10:42:54.757 Ink[2050] Main glyph layout loop. i:19
>> 2015-01-17 10:42:54.759 Ink[2050] glyph size 6.857143 0.000000
>> 2015-01-17 10:42:54.761 Ink[2050] moving to next glyph
>> 2015-01-17 10:42:54.763 Ink[2050] Main glyph layout loop. i:20
>> 2015-01-17 10:42:54.765 Ink[2050] GSHorizontalTypeSetter - howMany 0
>> 2015-01-17 10:42:54.768 Ink[2050] layoutNewParagraph: 0
>>
>> if I recompile without debug symbols,
>> 2015-01-17 10:49:09.767 Ink[3547] Main glyph layout loop. i:3
>> 2015-01-17 10:49:09.769 Ink[3547] glyph size 8.000000 0.000000
>> 2015-01-17 10:49:09.771 Ink[3547] moving to next glyph
>> 2015-01-17 10:49:09.773 Ink[3547] Main glyph layout loop. i:4
>> 2015-01-17 10:49:09.775 Ink[3547] GSHorizontalTypeSetter - howMany 0
>> 2015-01-17 10:49:09.776 Ink[3547] layoutNewParagraph: 0
>> 2015-01-17 10:49:09.786 Ink[3547] layoutGlyphsInLayoutManager index 0 
>> howMany 0
>> 2015-01-17 10:49:09.788 Ink[3547] layoutNewParagraph: 1
>> 2015-01-17 10:49:09.801 Ink[3547] layoutGlyphsInLayoutManager index 0 
>> howMany 0
>> 2015-01-17 10:49:09.803 Ink[3547] layoutNewParagraph: 1
>> 2015-01-17 10:49:09.826 Ink[3547] f_ascender: 10.285714
>> 2015-01-17 10:49:09.828 Ink[3547] Main glyph layout loop. i:0
>> 2015-01-17 10:49:09.830 Ink[3547] f_ascender: 10.285714
>> 2015-01-17 10:49:09.831 Ink[3547] Main glyph layout loop. i:0
>> 2015-01-17 10:49:09.833 Ink[3547] f_ascender: 10.285714
>> <....>
>>
>> This at least means that it is not stuck at the "end" because they do not 
>> overlap, sizes are different, ascenders
>>
>> Can I print out glyphs somehow, so we know what is it trying to print out?
>>
>> Riccardo