[Pysdl-devel] Introduction and patch

[Ben S. <be...@ni...>]

Hello, 

My name is Ben Smith, I was attempting to write a SDL module for python as
well.  It was an uphill battle for me, I'm new to python, and I've still
got a lot to learn about c, and trying to use the ExtensionClass for it.
I found this module today and it rules!  I added a small patch that allows
you to manipulate the pixel buffer of an SDL surface in a 2d python array.  

here's a quick example:

import sdl
from whrandom import randint
sdl.init(16)
surface = sdl.video_set_mode(320,200,8,0)
pixels = surface.get_pixels()


print "generating random colors... this takes a while"
for x in range (len(pixels)):
  for y in range (len(pixels[x])):
    pixels[x][y] = surface.map_rgb((randint(0,254), randint(0,254), 
      randint(0,254)))

surface.set_pixels(pixels)
surface.update_rect((0,0,0,0))

import time
time.sleep(20)

It's not the fastest thing ever, but you get access to the pixel buffer
pseudo-directly in python.  

The list of lists containing the pixel colors(pixels) is not destroyed in
the call to set_pixels, because I thought it may be useful to keep around.
I also didn't attach it to the surface object itself, because I thought it
would move even more slowly if there were large arrays for every surface.
It's also significantly faster without so many calls to randint and
surface.map_rgb.  


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