Re: [pygame] Font-Related Segfault

[Bryce Schroeder <bryce.schroeder@xxxxxxxxx>]

This code reproduces the problem. It is also as an attachment.

My system:
uname -a:
Linux thales 2.6.28-15-generic #52-Ubuntu SMP Wed Sep 9 10:48:52 UTC
2009 x86_64 GNU/Linux


-------file: tester.py --------------
import pygame, StringIO, sys
pygame.font.init()
if len(sys.argv) != 2:
	print >> sys.stderr, "Usage: python tester.py font.ttf"
	sys.exit(1)

font = pygame.font.Font(sys.argv[1], 12)
print "Loaded the font as a file:", font

test = open(sys.argv[1]).read()
stio = StringIO.StringIO(test)
font2 = pygame.font.Font(stio, 12)
print "Loaded the font as a StringIO:", font2
-------------------------------------------------

On Mon, Nov 23, 2009 at 2:27 PM, Bryce Schroeder
<bryce.schroeder@xxxxxxxxx> wrote:
> Okay:
> I wrote the string (self.parts['font']) out to a temporary file and
> diff'd it against the original file, and they are identical.
> Pygame successfully loads the font from the temporary file, and the
> font works normally. However I would definitely like to
> find a less kludgish solution to the problem.
>
> The particular font does not appear to matter, or at least, a wide
> variety of truetype fonts are affected - I can't load Junius Unicode
> or Free Serif from a StringIO either, but I can load them from files.
>
> It worked about six to eight months ago. Sorry I can't be more
> specific - I sort of mothballed the project for a while.
>
> Sorry I didn't provide a "demonstration program" I will try to keep
> that in mind in the future.
>
> - Bryce
>
>
> On Mon, Nov 23, 2009 at 2:05 PM, Brian Fisher <brian@xxxxxxxxxxxxxxxxxxx> wrote:
>> Pygame should be supporting a file-like object no problem, so this seems
>> like it could be a bug.
>>
>> Can you be more specific on when in the past it worked, and what happened
>> between then and when it segfaults now?
>>
>> Also, it's not clear from your problem description whether the problem is
>> that pygame crashes when loading from a file-like object, or if pygame
>> crashes on a specific set of font data.
>>
>> So I would suggest doing a sanity check here by writing the
>> self.parts['font'] string to a temp file, and trying to load from that, as a
>> way of being able to determine if the crash is caused by the file-like
>> object reading, or by some problem with the contents of the file-like
>> object.
>>
>> So something like:
>> ------------
>> class Font(Resource):
>>  ....
>>   def pygame_font(self,size):
>>       file(temp_file_name, "w").write(self.parts['font'])
>>       return pygame.font.Font(temp_file_name, size)
>>       os.unlink(temp_file_name)
>> ------------
>> If that still crashes, then pygame has trouble with that font content, and
>> then the question would be to figure out what about that font content is
>> causing problems. If that doesn't crash, then the problem would be with
>> accessing the content as a file-like object.
>>
>>
>> ... finally, as general advice to all people posting problems - if you can
>> send a completely self-contained reproducible case, then you are much more
>> likely to get good help and results faster. As an example in this case,
>> providing the contents of the self.parts['font'] string in an attached file
>> with a simple script that tries to load from a StringIO using that file's
>> contents, would make this easily reproducible and testable by fellow mailing
>> listers - but without knowing what the contents of the string in question
>> are, it may actually be practically impossible for anyone else to test
>> themselves.
>>
>>
>> On Mon, Nov 23, 2009 at 12:38 PM, Bryce Schroeder
>> <bryce.schroeder@xxxxxxxxx> wrote:
>>>
>>> (My apologies if this is a double-post. I didn't get a copy of the
>>> message or see it in the archive, so I'm trying again.)
>>>
>>>  I have a pygame program that worked in the past on both Linux and
>>> Windows, but now results in a segfault, at least on Linux.  (I can't
>>> test it on Windows.)
>>> The segfault occurs in this code:
>>>
>>> class Font(Resource):
>>>  ....
>>>   def pygame_font(self,size):
>>>       return pygame.font.Font(StringIO.StringIO(self.parts['font']),
>>> size) # Segfaults here
>>>
>>>
>>> self.parts['font'] is a string containing a truetype font loaded from
>>> a file. I have checked that the string contains the file like it is
>>> supposed too. Any suggestions?
>>
>>
>

import pygame, StringIO, sys
pygame.font.init()
if len(sys.argv) != 2: 
	print >> sys.stderr, "Usage: python tester.py font.ttf"
	sys.exit(1)

font = pygame.font.Font(sys.argv[1], 12)
print "Loaded the font as a file:", font

test = open(sys.argv[1]).read()
stio = StringIO.StringIO(test)
font2 = pygame.font.Font(stio, 12)
print "Loaded the font as a StringIO:", font2