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- #
- # The Python Imaging Library
- # $Id$
- #
- # bitmap distribution font (bdf) file parser
- #
- # history:
- # 1996-05-16 fl created (as bdf2pil)
- # 1997-08-25 fl converted to FontFile driver
- # 2001-05-25 fl removed bogus __init__ call
- # 2002-11-20 fl robustification (from Kevin Cazabon, Dmitry Vasiliev)
- # 2003-04-22 fl more robustification (from Graham Dumpleton)
- #
- # Copyright (c) 1997-2003 by Secret Labs AB.
- # Copyright (c) 1997-2003 by Fredrik Lundh.
- #
- # See the README file for information on usage and redistribution.
- #
-
- """
- Parse X Bitmap Distribution Format (BDF)
- """
-
-
- from . import FontFile, Image
-
- bdf_slant = {
- "R": "Roman",
- "I": "Italic",
- "O": "Oblique",
- "RI": "Reverse Italic",
- "RO": "Reverse Oblique",
- "OT": "Other",
- }
-
- bdf_spacing = {"P": "Proportional", "M": "Monospaced", "C": "Cell"}
-
-
- def bdf_char(f):
- # skip to STARTCHAR
- while True:
- s = f.readline()
- if not s:
- return None
- if s[:9] == b"STARTCHAR":
- break
- id = s[9:].strip().decode("ascii")
-
- # load symbol properties
- props = {}
- while True:
- s = f.readline()
- if not s or s[:6] == b"BITMAP":
- break
- i = s.find(b" ")
- props[s[:i].decode("ascii")] = s[i + 1 : -1].decode("ascii")
-
- # load bitmap
- bitmap = []
- while True:
- s = f.readline()
- if not s or s[:7] == b"ENDCHAR":
- break
- bitmap.append(s[:-1])
- bitmap = b"".join(bitmap)
-
- # The word BBX
- # followed by the width in x (BBw), height in y (BBh),
- # and x and y displacement (BBxoff0, BByoff0)
- # of the lower left corner from the origin of the character.
- width, height, x_disp, y_disp = [int(p) for p in props["BBX"].split()]
-
- # The word DWIDTH
- # followed by the width in x and y of the character in device pixels.
- dwx, dwy = [int(p) for p in props["DWIDTH"].split()]
-
- bbox = (
- (dwx, dwy),
- (x_disp, -y_disp - height, width + x_disp, -y_disp),
- (0, 0, width, height),
- )
-
- try:
- im = Image.frombytes("1", (width, height), bitmap, "hex", "1")
- except ValueError:
- # deal with zero-width characters
- im = Image.new("1", (width, height))
-
- return id, int(props["ENCODING"]), bbox, im
-
-
- class BdfFontFile(FontFile.FontFile):
- """Font file plugin for the X11 BDF format."""
-
- def __init__(self, fp):
- super().__init__()
-
- s = fp.readline()
- if s[:13] != b"STARTFONT 2.1":
- msg = "not a valid BDF file"
- raise SyntaxError(msg)
-
- props = {}
- comments = []
-
- while True:
- s = fp.readline()
- if not s or s[:13] == b"ENDPROPERTIES":
- break
- i = s.find(b" ")
- props[s[:i].decode("ascii")] = s[i + 1 : -1].decode("ascii")
- if s[:i] in [b"COMMENT", b"COPYRIGHT"]:
- if s.find(b"LogicalFontDescription") < 0:
- comments.append(s[i + 1 : -1].decode("ascii"))
-
- while True:
- c = bdf_char(fp)
- if not c:
- break
- id, ch, (xy, dst, src), im = c
- if 0 <= ch < len(self.glyph):
- self.glyph[ch] = xy, dst, src, im
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