E_B_L_C_.py 文件源码

def compile(self, ttFont):
        # First make sure that all the data lines up properly. Format 4
        # must have all its data lined up consecutively. If not this will fail.
        for curLoc, nxtLoc in zip(self.locations, self.locations[1:]):
            assert curLoc[1] == nxtLoc[0], "Data must be consecutive in indexSubTable format 4"

        offsets = list(self.locations[0]) + [loc[1] for loc in self.locations[1:]]
        # Image data offset must be less than or equal to the minimum of locations.
        # Resetting this offset may change the value for round tripping but is safer
        # and allows imageDataOffset to not be required to be in the XML version.
        self.imageDataOffset = min(offsets)
        offsets = [offset - self.imageDataOffset for offset in offsets]
        glyphIds = list(map(ttFont.getGlyphID, self.names))
        # Create an iterator over the ids plus a padding value.
        idsPlusPad = list(itertools.chain(glyphIds, [0]))

        dataList = [EblcIndexSubTable.compile(self, ttFont)]
        dataList.append(struct.pack(">L", len(glyphIds)))
        tmp = [struct.pack(codeOffsetPairFormat, *cop) for cop in zip(idsPlusPad, offsets)]
        dataList += tmp
        data = bytesjoin(dataList)
        return data