Att the set-able FontVal rasterization test parameters.

rast_parameters.py

import clr
clr.AddReference("OTFontFileVal.dll")

from OTFontFileVal import ValidatorParameters

from System import Array
from System.Collections.Generic import List

class validation_parameters:
    def __init__(self):
        vp = ValidatorParameters()
        ###############################################################
        # below are just the default values and can be deleted as is. #
        ###############################################################
        vp.doRastBW = false
        vp.doRastBW = false
        vp.doRastGray = false
        vp.doRastClearType = false
        vp.doRastCTCompWidth = false
        vp.doRastCTVert = false
        vp.doRastCTBGR = false
        vp.doRastCTFractWidth = false
        vp.xRes = 96
        vp.yRes = 96
        vp.xform.stretchX = 1.0
        vp.xform.stretchY = 1.0
        vp.xform.rotation = 0.0
        vp.xform.skew     = 0.0
        vp.xform.matrix = Array[Array[float]]( ( (1.0, 0.0, 0.0),
                                                 (0.0, 1.0, 0.0),
                                                 (0.0, 0.0, 1.0) ) )
        vp.sizes = List[int]([4,5,6,7,8,9,10,
                              11,12,13,14,15,16,17,18,19,20,
                              21,22,23,24,25,26,27,28,29,30,
                              31,32,33,34,35,36,37,38,39,40,
                              41,42,43,44,45,46,47,48,49,50,
                              51,52,53,54,55,56,57,58,59,60,
                              61,62,63,64,65,66,67,68,69,70,
                              71,72,
                              80,88,96,102,110,118,126])
        ###############################################################
        ################## default values end #########################
        ###############################################################
        self.vp = vp

    def GetValue(self):
        return self.vp

The default constructor sets all tables to test, and loading the validation parameters this way should be before any of these options:

+table, -table, -all-tables, -only-tables, +raster-tests

to the command-line FontValidator, otherwise they may not have the desired effect.