# # 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 . import Image, _binary WIDTH = 800 def puti16(fp, values): """Write network order (big-endian) 16-bit sequence""" for v in values: if v < 0: v += 65536 fp.write(_binary.o16be(v)) class FontFile: """Base class for raster font file handlers.""" 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 += 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 = src[2] - src[0] # yy = 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) self.metrics[i] = d, dst, s def save(self, filename): """Save font""" self.compile() # font data self.bitmap.save(os.path.splitext(filename)[0] + ".pbm", "PNG") # font metrics with open(os.path.splitext(filename)[0] + ".pil", "wb") as fp: fp.write(b"PILfont\n") fp.write(f";;;;;;{self.ysize};\n".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])