PcfFontFile.py 文件源码

def _load_bitmaps(self, metrics):

        #
        # bitmap data

        bitmaps = []

        fp, format, i16, i32 = self._getformat(PCF_BITMAPS)

        nbitmaps = i32(fp.read(4))

        if nbitmaps != len(metrics):
            raise IOError, "Wrong number of bitmaps"

        offsets = []
        for i in range(nbitmaps):
            offsets.append(i32(fp.read(4)))

        bitmapSizes = []
        for i in range(4):
            bitmapSizes.append(i32(fp.read(4)))

        byteorder = format & 4 # non-zero => MSB
        bitorder  = format & 8 # non-zero => MSB
        padindex  = format & 3

        bitmapsize = bitmapSizes[padindex]
        offsets.append(bitmapsize)

        data = fp.read(bitmapsize)

        pad  = BYTES_PER_ROW[padindex]
        mode = "1;R"
        if bitorder:
            mode = "1"

        for i in range(nbitmaps):
            x, y, l, r, w, a, d, f = metrics[i]
            b, e = offsets[i], offsets[i+1]
            bitmaps.append(
                Image.fromstring("1", (x, y), data[b:e], "raw", mode, pad(x))
                )

        return bitmaps