Re: [pygame] Another blitting surface to itself crash

["René Dudfield" <renesd@xxxxxxxxx>]

sure, maybe we could do a quick 1.8.2 release?  I'd like to fix up the
various Color bugs too.

We can change the trunk around to 1.8.2pre instead of 1.9pre.  I'd
like to back out a few changes from trunk if we do this.

cu,


On Wed, Aug 20, 2008 at 9:25 AM, Lenard Lindstrom <len-l@xxxxxxxxx> wrote:
> Hi René,
>
> It could be glibc makes fewer assumptions that Microsoft's C runtime. When I
> get a chance to recompile SDL.dll and test it maybe it would be an idea to
> update the Pygame 1.8.1 installer to include the patched SDL.dll as well as
> an SDL_mixer.dll that fixes the quit/init bug:
>
> http://article.gmane.org/gmane.comp.python.pygame/14947/match=mixer+quit+restart
>
>
> Lenard
>
>
> René Dudfield wrote:
>>
>> nice work :)
>>
>> By the sounds of it, that flag might be cleared by linux/glibc?  That
>> would make sense if it's working ok on linux.
>>
>>
>> On Wed, Aug 20, 2008 at 7:24 AM, Lenard Lindstrom <len-l@xxxxxxxxx> wrote:
>>
>>>
>>> I believe I found the bug. And it was already fixed for SDL 1.3 (I cannot
>>> confirm it is also fixed for 1.2.13 in SVN since the site is down.) There
>>> should be a licensing requirement to do assembly level programming :-).
>>> The
>>> optimized reverse blit uses an i386 string move instruction. The
>>> direction
>>> of the copy is controlled by a register flag. A cleared flag causes a
>>> forward copy, the data pointers are incremented. A set flag causes a
>>> reverse
>>> copy, decrementing data pointers. The flag was set by the SDL copy code,
>>> but
>>> not cleared afterwards. And the flag doesn't reset itself apparently. So
>>> the
>>> set flag sat there like an armed bomb until the next string copy
>>> instruction
>>> was executed.
>>>
>>> Lenard
>>>
>>>
>>> Lenard Lindstrom wrote:
>>>
>>>>
>>>> That seems to be it. Try out the modified SDL.dll for Pythons 2.4. and
>>>> 2.5:
>>>>
>>>> http://www3.telus.net/len_l/pygame/SDL-self-blit.zip
>>>>
>>>> md5sum:
>>>> 59a283f9383d6b5512c236d98e39c97b *SDL-self-blit.zip
>>>>
>>>> Lenard
>>>>
>>>>
>>>> Lenard Lindstrom wrote:
>>>>
>>>>>
>>>>> I will. But it will be hand-customized.
>>>>>
>>>>> Lenard
>>>>>
>>>>>
>>>>> Brian Fisher wrote:
>>>>>
>>>>>>
>>>>>> Hey Lenard,
>>>>>> Can you build SDL with mingw in a way that the inlined assembly won't
>>>>>> be
>>>>>> used? (i.e. so that it uses the same source that VisualC does to
>>>>>> build)
>>>>>>
>>>>>>
>>>>>>
>>>
>>>
>
>