Thanks Nicholas,
That is kind of interesting, and kind of confusing. Hugo Arts got a
Pygame parachute on XP that was traced to SDL itself. I get a Fatal
Python error, as do you. But unless you use a vintage Windows system as
I do then it would seem the type of error is independent of Windows
version. It behaves as a memory violation, but where. And it is MinGW
specific.
I ran gdb on a small C program that does a self blit. I saw no place
where pointers go astray. The obvious way in which MinGW and VC code
differs is some inline assembly happens with MinGW. But a test on the
inlined assembly code involved with an overlapping blit showed no
problems. I must be making a faulty assumption somewhere.
Lenard
Nicholas Dudfield wrote:
Lenard,
"Fatal Python error: Inconsistent interned string state."
On Mon, Aug 18, 2008 at 8:17 AM, Lenard Lindstrom <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Yes, debug print statements show the crash happens when the SDL
blit funcion SDL_BlitSurface is called. Did you get a Pygame
parachute or a Python interned string violation?
Lenard
Nicholas Dudfield wrote:
Ok, I have been informed there is are PyGame blits not derived
from SDL, so that explains that.
{pygame_AlphaBlit, pygame_Blit} from clip above looks like
Seems oblivious (sic) now it's pointed out.
On Sat, Aug 16, 2008 at 4:37 PM, Nicholas Dudfield
<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
<mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>> wrote:
I had a little play with the test_blit_to_self.py:
SDL VERSION:
1.2.13 prebuilts
PYGAME:
Mingw compiled, svn r 1619
OBSERVATIONS:
Unmodified the test wouldn't run at all as noted earlier.
I don't know if it's any help but I noticed after
commenting out
the "blitting screen to self" section that I could get the
"blitting surface to self" test and "blitting surface to
screen"
to run the full 100 cycles if I instantiated the Surface
`a` with
pygame.SRCALPHA flags.
Also, if using BLEND_RGB_ADD flags "blitting screen to self"
worked. Also screen.copy() worked as a source... but eh.
CONCLUSIONS:
s.blit(s, (0,0)) works if SRCALPHA bits set for s
screen.blit(screen, step, None, pygame.BLEND_RGB_ADD)
Is that any help for you guys in debugging?? I have no C-fu
or I
would have a tinker myself.
--
Lenard Lindstrom
<[EMAIL PROTECTED]>
