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| # | |
| # The Python Imaging Library. | |
| # $Id$ | |
| # | |
| # XV Thumbnail file handler by Charles E. "Gene" Cash | |
| # ([email protected]) | |
| # | |
| # 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 __future__ import annotations | |
| 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: bytes) -> bool: | |
| return prefix[:6] == _MAGIC | |
| ## | |
| # Image plugin for XV thumbnail images. | |
| class XVThumbImageFile(ImageFile.ImageFile): | |
| format = "XVThumb" | |
| format_description = "XV thumbnail image" | |
| def _open(self) -> None: | |
| # check magic | |
| assert self.fp is not None | |
| 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) | |