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Directory : /usr/lib64/python2.7/site-packages/PIL/

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Current File : /usr/lib64/python2.7/site-packages/PIL/FontFile.py

#
# The Python Imaging Library
# $Id$
#
# base class for raster font file parsers
#
# history:
# 1997-06-05 fl   created
# 1997-08-19 fl   restrict image width
#
# Copyright (c) 1997-1998 by Secret Labs AB
# Copyright (c) 1997-1998 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#

import os
from PIL import Image, _binary

import marshal

try:
    import zlib
except ImportError:
    zlib = None

WIDTH = 800

def puti16(fp, values):
    # write network order (big-endian) 16-bit sequence
    for v in values:
        if v < 0:
            v = v + 65536
        fp.write(_binary.o16be(v))

##
# Base class for raster font file handlers.

class FontFile:

    bitmap = None

    def __init__(self):

        self.info = {}
        self.glyph = [None] * 256

    def __getitem__(self, ix):
        return self.glyph[ix]

    def compile(self):
        "Create metrics and bitmap"

        if self.bitmap:
            return

        # create bitmap large enough to hold all data
        h = w = maxwidth = 0
        lines = 1
        for glyph in self:
            if glyph:
                d, dst, src, im = glyph
                h = max(h, src[3] - src[1])
                w = w + (src[2] - src[0])
                if w > WIDTH:
                    lines = lines + 1
                    w = (src[2] - src[0])
                maxwidth = max(maxwidth, w)

        xsize = maxwidth
        ysize = lines * h

        if xsize == 0 and ysize == 0:
            return ""

        self.ysize = h

        # paste glyphs into bitmap
        self.bitmap = Image.new("1", (xsize, ysize))
        self.metrics = [None] * 256
        x = y = 0
        for i in range(256):
            glyph = self[i]
            if glyph:
                d, dst, src, im = glyph
                xx, yy = src[2] - src[0], src[3] - src[1]
                x0, y0 = x, y
                x = x + xx
                if x > WIDTH:
                    x, y = 0, y + h
                    x0, y0 = x, y
                    x = xx
                s = src[0] + x0, src[1] + y0, src[2] + x0, src[3] + y0
                self.bitmap.paste(im.crop(src), s)
                # print chr(i), dst, s
                self.metrics[i] = d, dst, s


    def save1(self, filename):
        "Save font in version 1 format"

        self.compile()

        # font data
        self.bitmap.save(os.path.splitext(filename)[0] + ".pbm", "PNG")

        # font metrics
        fp = open(os.path.splitext(filename)[0] + ".pil", "wb")
        fp.write(b"PILfont\n")
        fp.write((";;;;;;%d;\n" % self.ysize).encode('ascii')) # HACK!!!
        fp.write(b"DATA\n")
        for id in range(256):
            m = self.metrics[id]
            if not m:
                puti16(fp, [0] * 10)
            else:
                puti16(fp, m[0] + m[1] + m[2])
        fp.close()


    def save2(self, filename):
        "Save font in version 2 format"

        # THIS IS WORK IN PROGRESS

        self.compile()

        data = marshal.dumps((self.metrics, self.info))

        if zlib:
            data = b"z" + zlib.compress(data, 9)
        else:
            data = b"u" + data

        fp = open(os.path.splitext(filename)[0] + ".pil", "wb")

        fp.write(b"PILfont2\n" + self.name + "\n" + "DATA\n")

        fp.write(data)

        self.bitmap.save(fp, "PNG")

        fp.close()


    save = save1 # for now

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