[Pysdl-devel] Patch: Python file objects

[Eric J. <ea...@ri...>]

I have a patch for PySDL 0.0.3 to allow any Python
file-like object to be loaded or saved as an image.
It also allows strings to be loaded as data. This
could be useful for games and other programs that
might not want to store all of their images in
individual files.

So an image could be loaded any of these ways:

i = sdl.image_load("test.jpg")
i = sdl.image_load(open("test.jpg"))
i = sdl.image_load(open("test.jpg").read(), 1)
i = sdl.image_load(StringIO(open("test.jpg").read()))

The extra parameter is used to inhibit PySDL from
interpreting the string as a filename.

The functions that can work that way are: image_load,
image_is, image_load_type, and image_save_bmp. It
should be pretty easy to add support to any function
that uses SDL_RWops.

It works with MetaKit and Mk4py, in two ways:
taking the field straight out as a string, and
using the supplied MkMemoIO.py wrapper class as
a file-like object.

bugs/issues:

Saving to a string works, although it's not supposed
to (since strings are immutable.) Use StringIO or
cStringIO instead.

Exceptions are propagated, however the tracebacks are
sometimes a bit confusing because the actual callback
from C isn't traced. (When using native Python
objects.)

It's assumed that upon receiving an I/O error, SDL
will clean itself up and return an error, and not
try to recover or continue.

sure there's other things...

And I hope someone's reading this list, because I
didn't see any messages in the archives... ;)--spruceEVOHCFYNQPCNSDURERGN
Content-Type: application/octet-stream; name="sdl.diff"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="sdl.diff"

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