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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 i8, 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)): 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)