Re: [pygame] surfarray on 64-bit machines

[René Dudfield <renesd@xxxxxxxxx>]

hey,

is it possible to use numpy instead of Numeric?  Numeric really is
dying now...  even we are going to stop trying to keep it working.


cheers,



On Fri, Feb 27, 2009 at 10:49 AM, Marius Gedminas <marius@xxxxxxxxx> wrote:
> This was a long time ago (shame on me for not finding the time to
> investigate this further):
>
>> On Wed, Oct 22, 2008 at 7:23 PM, Marius Gedminas <marius@xxxxxxxxx> wrote:
>> > A user reported that PySpaceWar fails on 64-bit Linux machines if I try
>> > to scale the alpha channel.  Here's the code (simplified):
>> >
>> >    import pygame
>> >    import Numeric
>> >    image = pygame.image.load('title.png')   # has an alpha channel
>> >    mask = pygame.surfarray.array_alpha(image).astype(Numeric.Int)
>> >    array = pygame.surfarray.pixels_alpha(self.image)
>> >    alpha = 42.5 # a float between 1 and 255
>> >    array[:] = (mask * alpha / 255).astype(Numeric.UnsignedInt8)
>> >
>> > The error happens on the last line, and it says
>> >
>> >    ValueError: matrices are not aligned for copy
>> >
>> > Any ideas?  The code works fine on 32-bit systems.
>
> On Wed, Oct 22, 2008 at 09:28:46PM -0500, Charlie Nolan wrote:
>> I may be having this same error.  I've got a bug report with that same
>> error message at one point (and on a 64-bit machine), even though it
>> works fine on my (32-bit) machine.  Could you try printing out
>> "array[:].shape"?  In my case, I do a sensible slice and somehow end
>> up with a 0x600 array.
>
> On a 32-bit machine:
>
>  array[:].shape == array.shape == (333, 83)
>
> On a 64-bit machine:
>
>  array[:].shape == (0, 83)
>
> On Wed, Oct 22, 2008 at 07:46:53PM -0700, Lenard Lindstrom wrote:
>> I am curious, but what happens if array[:] is replaced with array[...].
>
> The code starts working!  Thank you!
>
>> It is a two dimension array, so I am surprised the single index slice
>> [:] even works.
>
> (on 32-bit only, for some reason).
>
>> The alternate form [..] is indifferent to array
>> dimension.
>
> It's a thinko on my part.  I want an in-place assignment, I tend to
> write container[:] = new_value, without considering dimensionality at
> all.
>
> Cheers!
> Marius Gedminas
> --
> A programmer started to cuss
> Because getting to sleep was a fuss
> As he lay there in bed
> Looping 'round in his head
> was: while(!asleep()) sheep++;
>
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