Source code for PIL.XVThumbImagePlugin

#
# The Python Imaging Library.
# $Id$
#
# XV Thumbnail file handler by Charles E. "Gene" Cash
# (gcash@magicnet.net)
#
# see xvcolor.c and xvbrowse.c in the sources to John Bradley's XV,
# available from ftp://ftp.cis.upenn.edu/pub/xv/
#
# history:
# 98-08-15 cec  created (b/w only)
# 98-12-09 cec  added color palette
# 98-12-28 fl   added to PIL (with only a few very minor modifications)
#
# To do:
# FIXME: make save work (this requires quantization support)
#

from . import Image, ImageFile, ImagePalette
from ._binary import i8, o8

__version__ = "0.1"

_MAGIC = b"P7 332"

# standard color palette for thumbnails (RGB332)
PALETTE = b""
for r in range(8):
    for g in range(8):
        for b in range(4):
            PALETTE = PALETTE + (o8((r*255)//7)+o8((g*255)//7)+o8((b*255)//3))


def _accept(prefix):
    return prefix[:6] == _MAGIC


##
# Image plugin for XV thumbnail images.

[docs]class XVThumbImageFile(ImageFile.ImageFile): format = "XVThumb" format_description = "XV thumbnail image" def _open(self): # check magic if not _accept(self.fp.read(6)): raise SyntaxError("not an XV thumbnail file") # Skip to beginning of next line self.fp.readline() # skip info comments while True: s = self.fp.readline() if not s: raise SyntaxError("Unexpected EOF reading XV thumbnail file") if i8(s[0]) != 35: # ie. when not a comment: '#' break # parse header line (already read) s = s.strip().split() self.mode = "P" self._size = int(s[0]), int(s[1]) self.palette = ImagePalette.raw("RGB", PALETTE) self.tile = [ ("raw", (0, 0)+self.size, self.fp.tell(), (self.mode, 0, 1) )]
# -------------------------------------------------------------------- Image.register_open(XVThumbImageFile.format, XVThumbImageFile, _accept)