#
# The Python Imaging Library.
# $Id$
#
# PIXAR raster support for PIL
#
# history:
#       97-01-29 fl     Created
#
# notes:
#       This is incomplete; it is based on a few samples created with
#       Photoshop 2.5 and 3.0, and a summary description provided by
#       Greg Coats <gcoats@labiris.er.usgs.gov>.  Hopefully, "L" and
#       "RGBA" support will be added in future versions.
#
# Copyright (c) Secret Labs AB 1997.
# Copyright (c) Fredrik Lundh 1997.
#
# See the README file for information on usage and redistribution.
#

__version__ = "0.1"

import Image, ImageFile

#
# helpers

def i16(c):
    return ord(c[0]) + (ord(c[1])<<8)

def i32(c):
    return ord(c[0]) + (ord(c[1])<<8) + (ord(c[2])<<16) + (ord(c[3])<<24)

##
# Image plugin for PIXAR raster images.

class PixarImageFile(ImageFile.ImageFile):

    format = "PIXAR"
    format_description = "PIXAR raster image"

    def _open(self):

        # assuming a 4-byte magic label (FIXME: add "_accept" hook)
        s = self.fp.read(4)
        if s != "\200\350\000\000":
            raise SyntaxError("not a PIXAR file")

        # read rest of header
        s = s + self.fp.read(508)

        self.size = i16(s[418:420]), i16(s[416:418])

        # get channel/depth descriptions
        mode = i16(s[424:426]), i16(s[426:428])

        if mode == (14, 2):
            self.mode = "RGB"
        # FIXME: to be continued...

        # create tile descriptor (assuming "dumped")
        self.tile = [("raw", (0,0)+self.size, 1024, (self.mode, 0, 1))]

#
# --------------------------------------------------------------------

Image.register_open("PIXAR", PixarImageFile)

#
# FIXME: what's the standard extension?