[pygame] Script crashes with Fatal Python error: (pygame parachute) segfault

["Mike C. Fletcher" <mcfletch@rogers.com>]

Hi all,

No clue why this is happening, the code seems perfectly fine (and 
simple).  Commenting out a tuple of 0's and 1's getting added to a 
dictionary avoids the segfault.  I'm assuming there's a memory 
management problem somewhere (possibly 0 or 1 getting garbage collected?)

Problem is seen with 1.4.9 downloaded a few minutes ago running against 
Python 2.2.  The traceback says that it's occuring on the line (around 68):
     for x,y in self.charmap.items():
         data.append( '%s:%s,\n'%( repr(x),repr(y)))

With x being a simple character and y being a tuple of (integer, 
integer, (0,0,1,1)).  The last item eventually will hold the mapping 
coordinates (floating point values) into a larger bitmap.

Any thoughts or pointers appreciated.
Mike

Here's the offending code (it's a simple script to generate fonts for 
use with PyOpenGL w/out the need to have PyGame available on the target 
system).
8<____________ font2.py ____________
import pygame
from pygame.locals import *
from pygame.font import *
from pygame.image import *
from pygame import *

pygame.init()

class Compiler:
     """Uses PyGame/SDL to generate a "compiled" font for use with 
PyOpenGL"""
     def __init__(
         self, filename=None, pixelSize=12, colour= (255,255,255),
         bold=0, italic=0, underline=0, antialias = 1,
     ):
         self.name = filename
         self.colour = colour
         self.pixelSize = pixelSize
         self.bold = bold
         self.italic = italic
         self.underline = underline
         self.antialias = antialias

         self.bitmaps = []
         self.charmap = {
         }
     def generate( self, characters = [chr(x) for x in range(0,256)]):
         """Generate glyph entries for each character in characters"""
         font = Font( self.name, self.pixelSize )
         font.set_bold( self.bold )
         font.set_italic( self.italic )
         font.set_underline( self.underline )

         for character in characters:
             try:
                 surface = font.render(
                     character,
                     self.antialias,
                     self.colour
                 )
             except error:
                 print 'fail character', repr(character), ord(character)
                 surface = font.render(
                     " ",
                     self.antialias,
                     self.colour
                 )
             width, height = surface.get_size()
             imageData = image.tostring(surface, 'RGBA', 1)
             # XXX do blit into a shared bitmap here...
             # for now, each character has its own bitmap!
             # coordinates are 0,0,1,1 because of that
             # and the bitmap is just the bitmap we're adding
             self.bitmaps.append( imageData )
             self.charmap[ character ] = (
                 int(width),
                 len(self.bitmaps)-1,

## Uncommenting this line causes the pygame crash :(
## looking as though 0, or 1 is being destroyed?
               (0,0,1,1)

             )
     def tostring( self ):
         """Return this font as a string for instantiation"""

         data = []
         for x,y in self.charmap.items():
             data.append( '%s:%s,\n'%( repr(x),repr(y)))
         characterMap = ",\n".join( data )
         return """Font(
     name = %s,
     pixelSize = %s,
     colour = %s,
     bold = %s,
     italic = %s,
     underline = %s,
     antialias = %s,
     bitmaps = [
%s
],
     charmap = {
     %s
}
)"""%(
         self.name, self.pixelSize, self.colour,
         self.bold, self.italic, self.underline, self.antialias,
         ",\n".join(map(repr, self.bitmaps)),
         characterMap,
     )


if __name__ == "__main__":
     s = Compiler()
     s.generate()
     print 'finished generation'
     open( 'test.py', 'w').write( s.tostring())
     print 'finished writing'


-- 
_______________________________________
   Mike C. Fletcher
   http://members.rogers.com/mcfletch/


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