82 lines
2.0 KiB
Python
82 lines
2.0 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# XV Thumbnail file handler by Charles E. "Gene" Cash
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# (gcash@magicnet.net)
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#
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# see xvcolor.c and xvbrowse.c in the sources to John Bradley's XV,
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# available from ftp://ftp.cis.upenn.edu/pub/xv/
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#
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# history:
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# 98-08-15 cec created (b/w only)
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# 98-12-09 cec added color palette
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# 98-12-28 fl added to PIL (with only a few very minor modifications)
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#
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# To do:
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# FIXME: make save work (this requires quantization support)
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#
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from __future__ import annotations
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from . import Image, ImageFile, ImagePalette
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from ._binary import o8
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_MAGIC = b"P7 332"
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# standard color palette for thumbnails (RGB332)
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PALETTE = b""
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for r in range(8):
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for g in range(8):
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for b in range(4):
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PALETTE = PALETTE + (
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o8((r * 255) // 7) + o8((g * 255) // 7) + o8((b * 255) // 3)
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)
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def _accept(prefix: bytes) -> bool:
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return prefix[:6] == _MAGIC
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##
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# Image plugin for XV thumbnail images.
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class XVThumbImageFile(ImageFile.ImageFile):
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format = "XVThumb"
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format_description = "XV thumbnail image"
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def _open(self) -> None:
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# check magic
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assert self.fp is not None
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if not _accept(self.fp.read(6)):
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msg = "not an XV thumbnail file"
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raise SyntaxError(msg)
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# Skip to beginning of next line
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self.fp.readline()
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# skip info comments
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while True:
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s = self.fp.readline()
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if not s:
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msg = "Unexpected EOF reading XV thumbnail file"
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raise SyntaxError(msg)
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if s[0] != 35: # ie. when not a comment: '#'
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break
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# parse header line (already read)
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s = s.strip().split()
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self._mode = "P"
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self._size = int(s[0]), int(s[1])
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self.palette = ImagePalette.raw("RGB", PALETTE)
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self.tile = [("raw", (0, 0) + self.size, self.fp.tell(), (self.mode, 0, 1))]
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# --------------------------------------------------------------------
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Image.register_open(XVThumbImageFile.format, XVThumbImageFile, _accept)
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