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- #
- # 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 o8
- _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.
- class XVThumbImageFile(ImageFile.ImageFile):
- format = "XVThumb"
- format_description = "XV thumbnail image"
- def _open(self):
- # check magic
- if not _accept(self.fp.read(6)):
- msg = "not an XV thumbnail file"
- raise SyntaxError(msg)
- # Skip to beginning of next line
- self.fp.readline()
- # skip info comments
- while True:
- s = self.fp.readline()
- if not s:
- msg = "Unexpected EOF reading XV thumbnail file"
- raise SyntaxError(msg)
- if 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)
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