path: root/Tests/ttLib/tables/_g_l_y_f_test.py

from fontTools.misc.fixedTools import otRound
from fontTools.misc.testTools import getXML, parseXML
from fontTools.pens.ttGlyphPen import TTGlyphPen
from fontTools.pens.recordingPen import RecordingPen, RecordingPointPen
from fontTools.pens.pointPen import PointToSegmentPen
from fontTools.ttLib import TTFont, newTable, TTLibError
from fontTools.ttLib.tables._g_l_y_f import (
    Glyph,
    GlyphCoordinates,
    GlyphComponent,
    ARGS_ARE_XY_VALUES,
    SCALED_COMPONENT_OFFSET,
    UNSCALED_COMPONENT_OFFSET,
    WE_HAVE_A_SCALE,
    WE_HAVE_A_TWO_BY_TWO,
    WE_HAVE_AN_X_AND_Y_SCALE,
)
from fontTools.ttLib.tables import ttProgram
import sys
import array
from io import StringIO
import itertools
import pytest
import re
import os
import unittest


class GlyphCoordinatesTest(object):

    def test_translate(self):
        g = GlyphCoordinates([(1,2)])
        g.translate((.5,0))
        assert g == GlyphCoordinates([(1.5,2.0)])

    def test_scale(self):
        g = GlyphCoordinates([(1,2)])
        g.scale((.5,0))
        assert g == GlyphCoordinates([(0.5,0.0)])

    def test_transform(self):
        g = GlyphCoordinates([(1,2)])
        g.transform(((.5,0),(.2,.5)))
        assert g[0] == GlyphCoordinates([(0.9,1.0)])[0]

    def test__eq__(self):
        g = GlyphCoordinates([(1,2)])
        g2 = GlyphCoordinates([(1.0,2)])
        g3 = GlyphCoordinates([(1.5,2)])
        assert g == g2
        assert not g == g3
        assert not g2 == g3
        assert not g == object()

    def test__ne__(self):
        g = GlyphCoordinates([(1,2)])
        g2 = GlyphCoordinates([(1.0,2)])
        g3 = GlyphCoordinates([(1.5,2)])
        assert not (g != g2)
        assert g != g3
        assert g2 != g3
        assert g != object()

    def test__pos__(self):
        g = GlyphCoordinates([(1,2)])
        g2 = +g
        assert g == g2

    def test__neg__(self):
        g = GlyphCoordinates([(1,2)])
        g2 = -g
        assert g2 == GlyphCoordinates([(-1, -2)])

    @pytest.mark.skipif(sys.version_info[0] < 3,
                        reason="__round___ requires Python 3")
    def test__round__(self):
        g = GlyphCoordinates([(-1.5,2)])
        g2 = round(g)
        assert g2 == GlyphCoordinates([(-1,2)])

    def test__add__(self):
        g1 = GlyphCoordinates([(1,2)])
        g2 = GlyphCoordinates([(3,4)])
        g3 = GlyphCoordinates([(4,6)])
        assert g1 + g2 == g3
        assert g1 + (1, 1) == GlyphCoordinates([(2,3)])
        with pytest.raises(TypeError) as excinfo:
            assert g1 + object()
        assert 'unsupported operand' in str(excinfo.value)

    def test__sub__(self):
        g1 = GlyphCoordinates([(1,2)])
        g2 = GlyphCoordinates([(3,4)])
        g3 = GlyphCoordinates([(-2,-2)])
        assert g1 - g2 == g3
        assert g1 - (1, 1) == GlyphCoordinates([(0,1)])
        with pytest.raises(TypeError) as excinfo:
            assert g1 - object()
        assert 'unsupported operand' in str(excinfo.value)

    def test__rsub__(self):
        g = GlyphCoordinates([(1,2)])
        # other + (-self)
        assert (1, 1) - g == GlyphCoordinates([(0,-1)])

    def test__mul__(self):
        g = GlyphCoordinates([(1,2)])
        assert g * 3 == GlyphCoordinates([(3,6)])
        assert g * (3,2) == GlyphCoordinates([(3,4)])
        assert g * (1,1) == g
        with pytest.raises(TypeError) as excinfo:
            assert g * object()
        assert 'unsupported operand' in str(excinfo.value)

    def test__truediv__(self):
        g = GlyphCoordinates([(1,2)])
        assert g / 2 == GlyphCoordinates([(.5,1)])
        assert g / (1, 2) == GlyphCoordinates([(1,1)])
        assert g / (1, 1) == g
        with pytest.raises(TypeError) as excinfo:
            assert g / object()
        assert 'unsupported operand' in str(excinfo.value)

    def test__iadd__(self):
        g = GlyphCoordinates([(1,2)])
        g += (.5,0)
        assert g == GlyphCoordinates([(1.5, 2.0)])
        g2 = GlyphCoordinates([(3,4)])
        g += g2
        assert g == GlyphCoordinates([(4.5, 6.0)])

    def test__isub__(self):
        g = GlyphCoordinates([(1,2)])
        g -= (.5, 0)
        assert g == GlyphCoordinates([(0.5, 2.0)])
        g2 = GlyphCoordinates([(3,4)])
        g -= g2
        assert g == GlyphCoordinates([(-2.5, -2.0)])

    def __test__imul__(self):
        g = GlyphCoordinates([(1,2)])
        g *= (2,.5)
        g *= 2
        assert g == GlyphCoordinates([(4.0, 2.0)])
        g = GlyphCoordinates([(1,2)])
        g *= 2
        assert g == GlyphCoordinates([(2, 4)])

    def test__itruediv__(self):
        g = GlyphCoordinates([(1,3)])
        g /= (.5,1.5)
        g /= 2
        assert g == GlyphCoordinates([(1.0, 1.0)])

    def test__bool__(self):
        g = GlyphCoordinates([])
        assert bool(g) == False
        g = GlyphCoordinates([(0,0), (0.,0)])
        assert bool(g) == True
        g = GlyphCoordinates([(0,0), (1,0)])
        assert bool(g) == True
        g = GlyphCoordinates([(0,.5), (0,0)])
        assert bool(g) == True

    def test_double_precision_float(self):
        # https://github.com/fonttools/fonttools/issues/963
        afloat = 242.50000000000003
        g = GlyphCoordinates([(afloat, 0)])
        g.toInt()
        # this would return 242 if the internal array.array typecode is 'f',
        # since the Python float is truncated to a C float.
        # when using typecode 'd' it should return the correct value 243
        assert g[0][0] == otRound(afloat)

    def test__checkFloat_overflow(self):
        g = GlyphCoordinates([(1, 1)])
        g.append((0x8000, 0))
        assert list(g.array) == [1.0, 1.0, 32768.0, 0.0]


CURR_DIR = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
DATA_DIR = os.path.join(CURR_DIR, 'data')

GLYF_TTX = os.path.join(DATA_DIR, "_g_l_y_f_outline_flag_bit6.ttx")
GLYF_BIN = os.path.join(DATA_DIR, "_g_l_y_f_outline_flag_bit6.glyf.bin")
HEAD_BIN = os.path.join(DATA_DIR, "_g_l_y_f_outline_flag_bit6.head.bin")
LOCA_BIN = os.path.join(DATA_DIR, "_g_l_y_f_outline_flag_bit6.loca.bin")
MAXP_BIN = os.path.join(DATA_DIR, "_g_l_y_f_outline_flag_bit6.maxp.bin")


def strip_ttLibVersion(string):
    return re.sub(' ttLibVersion=".*"', '', string)


class GlyfTableTest(unittest.TestCase):

    def __init__(self, methodName):
        unittest.TestCase.__init__(self, methodName)
        # Python 3 renamed assertRaisesRegexp to assertRaisesRegex,
        # and fires deprecation warnings if a program uses the old name.
        if not hasattr(self, "assertRaisesRegex"):
            self.assertRaisesRegex = self.assertRaisesRegexp

    @classmethod
    def setUpClass(cls):
        with open(GLYF_BIN, 'rb') as f:
            cls.glyfData = f.read()
        with open(HEAD_BIN, 'rb') as f:
            cls.headData = f.read()
        with open(LOCA_BIN, 'rb') as f:
            cls.locaData = f.read()
        with open(MAXP_BIN, 'rb') as f:
            cls.maxpData = f.read()
        with open(GLYF_TTX, 'r') as f:
            cls.glyfXML = strip_ttLibVersion(f.read()).splitlines()

    def test_toXML(self):
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        glyfTable = font['glyf'] = newTable('glyf')
        font['head'] = newTable('head')
        font['loca'] = newTable('loca')
        font['maxp'] = newTable('maxp')
        font['maxp'].decompile(self.maxpData, font)
        font['head'].decompile(self.headData, font)
        font['loca'].decompile(self.locaData, font)
        glyfTable.decompile(self.glyfData, font)
        out = StringIO()
        font.saveXML(out)
        glyfXML = strip_ttLibVersion(out.getvalue()).splitlines()
        self.assertEqual(glyfXML, self.glyfXML)

    def test_fromXML(self):
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        font.importXML(GLYF_TTX)
        glyfTable = font['glyf']
        glyfData = glyfTable.compile(font)
        self.assertEqual(glyfData, self.glyfData)

    def test_recursiveComponent(self):
        glyphSet = {}
        pen_dummy = TTGlyphPen(glyphSet)
        glyph_dummy = pen_dummy.glyph()
        glyphSet["A"] = glyph_dummy
        glyphSet["B"] = glyph_dummy
        pen_A = TTGlyphPen(glyphSet)
        pen_A.addComponent("B", (1, 0, 0, 1, 0, 0))
        pen_B = TTGlyphPen(glyphSet)
        pen_B.addComponent("A", (1, 0, 0, 1, 0, 0))
        glyph_A = pen_A.glyph()
        glyph_B = pen_B.glyph()
        glyphSet["A"] = glyph_A
        glyphSet["B"] = glyph_B
        with self.assertRaisesRegex(TTLibError, "glyph '.' contains a recursive component reference"):
            glyph_A.getCoordinates(glyphSet)

    def test_trim_remove_hinting_composite_glyph(self):
        glyphSet = {"dummy": TTGlyphPen(None).glyph()}

        pen = TTGlyphPen(glyphSet)
        pen.addComponent("dummy", (1, 0, 0, 1, 0, 0))
        composite = pen.glyph()
        p = ttProgram.Program()
        p.fromAssembly(['SVTCA[0]'])
        composite.program = p
        glyphSet["composite"] = composite

        glyfTable = newTable("glyf")
        glyfTable.glyphs = glyphSet
        glyfTable.glyphOrder = sorted(glyphSet)

        composite.compact(glyfTable)

        self.assertTrue(hasattr(composite, "data"))

        # remove hinting from the compacted composite glyph, without expanding it
        composite.trim(remove_hinting=True)

        # check that, after expanding the glyph, we have no instructions
        composite.expand(glyfTable)
        self.assertFalse(hasattr(composite, "program"))

        # now remove hinting from expanded composite glyph
        composite.program = p
        composite.trim(remove_hinting=True)

        # check we have no instructions
        self.assertFalse(hasattr(composite, "program"))

        composite.compact(glyfTable)

    def test_bit6_draw_to_pen_issue1771(self):
        # https://github.com/fonttools/fonttools/issues/1771
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        # glyph00003 contains a bit 6 flag on the first point,
        # which triggered the issue
        font.importXML(GLYF_TTX)
        glyfTable = font['glyf']
        pen = RecordingPen()
        glyfTable["glyph00003"].draw(pen, glyfTable=glyfTable)
        expected = [('moveTo', ((501, 1430),)),
                    ('lineTo', ((683, 1430),)),
                    ('lineTo', ((1172, 0),)),
                    ('lineTo', ((983, 0),)),
                    ('lineTo', ((591, 1193),)),
                    ('lineTo', ((199, 0),)),
                    ('lineTo', ((12, 0),)),
                    ('closePath', ()),
                    ('moveTo', ((249, 514),)),
                    ('lineTo', ((935, 514),)),
                    ('lineTo', ((935, 352),)),
                    ('lineTo', ((249, 352),)),
                    ('closePath', ())]
        self.assertEqual(pen.value, expected)

    def test_bit6_draw_to_pointpen(self):
        # https://github.com/fonttools/fonttools/issues/1771
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        # glyph00003 contains a bit 6 flag on the first point
        # which triggered the issue
        font.importXML(GLYF_TTX)
        glyfTable = font['glyf']
        pen = RecordingPointPen()
        glyfTable["glyph00003"].drawPoints(pen, glyfTable=glyfTable)
        expected = [
            ('beginPath', (), {}),
            ('addPoint', ((501, 1430), 'line', False, None), {}),
            ('addPoint', ((683, 1430), 'line', False, None), {}),
            ('addPoint', ((1172, 0), 'line', False, None), {}),
            ('addPoint', ((983, 0), 'line', False, None), {}),
        ]
        self.assertEqual(pen.value[:len(expected)], expected)

    def test_draw_vs_drawpoints(self):
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        font.importXML(GLYF_TTX)
        glyfTable = font['glyf']
        pen1 = RecordingPen()
        pen2 = RecordingPen()
        glyfTable["glyph00003"].draw(pen1, glyfTable)
        glyfTable["glyph00003"].drawPoints(PointToSegmentPen(pen2), glyfTable)
        self.assertEqual(pen1.value, pen2.value)

    def test_compile_empty_table(self):
        font = TTFont(sfntVersion="\x00\x01\x00\x00")
        font.importXML(GLYF_TTX)
        glyfTable = font['glyf']
        # set all glyphs to zero contours
        glyfTable.glyphs = {glyphName: Glyph() for glyphName in font.getGlyphOrder()}
        glyfData = glyfTable.compile(font)
        self.assertEqual(glyfData, b"\x00")
        self.assertEqual(list(font["loca"]), [0] * (font["maxp"].numGlyphs+1))

    def test_decompile_empty_table(self):
        font = TTFont()
        glyphNames = [".notdef", "space"]
        font.setGlyphOrder(glyphNames)
        font["loca"] = newTable("loca")
        font["loca"].locations = [0] * (len(glyphNames) + 1)
        font["glyf"] = newTable("glyf")
        font["glyf"].decompile(b"\x00", font)
        self.assertEqual(len(font["glyf"]), 2)
        self.assertEqual(font["glyf"][".notdef"].numberOfContours, 0)
        self.assertEqual(font["glyf"]["space"].numberOfContours, 0)

    def test_getPhantomPoints(self):
        # https://github.com/fonttools/fonttools/issues/2295
        font = TTFont()
        glyphNames = [".notdef"]
        font.setGlyphOrder(glyphNames)
        font["loca"] = newTable("loca")
        font["loca"].locations = [0] * (len(glyphNames) + 1)
        font["glyf"] = newTable("glyf")
        font["glyf"].decompile(b"\x00", font)
        font["hmtx"] = newTable("hmtx")
        font["hmtx"].metrics = {".notdef": (100,0)}
        font["head"] = newTable("head")
        font["head"].unitsPerEm = 1000
        self.assertEqual(
            font["glyf"].getPhantomPoints(".notdef", font, 0), 
            [(0, 0), (100, 0), (0, 0), (0, -1000)]
        )

class GlyphTest:

    def test_getCoordinates(self):
        glyphSet = {}
        pen = TTGlyphPen(glyphSet)
        pen.moveTo((0, 0))
        pen.lineTo((100, 0))
        pen.lineTo((100, 100))
        pen.lineTo((0, 100))
        pen.closePath()
        # simple contour glyph
        glyphSet["a"] = a = pen.glyph()

        assert a.getCoordinates(glyphSet) == (
            GlyphCoordinates([(0, 0), (100, 0), (100, 100), (0, 100)]),
            [3],
            array.array("B", [1, 1, 1, 1]),
        )

        # composite glyph with only XY offset
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("a", (1, 0, 0, 1, 10, 20))
        glyphSet["b"] = b = pen.glyph()

        assert b.getCoordinates(glyphSet) == (
            GlyphCoordinates([(10, 20), (110, 20), (110, 120), (10, 120)]),
            [3],
            array.array("B", [1, 1, 1, 1]),
        )

        # composite glyph with a scale (and referencing another composite glyph)
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("b", (0.5, 0, 0, 0.5, 0, 0))
        glyphSet["c"] = c = pen.glyph()

        assert c.getCoordinates(glyphSet) == (
            GlyphCoordinates([(5, 10), (55, 10), (55, 60), (5, 60)]),
            [3],
            array.array("B", [1, 1, 1, 1]),
        )

        # composite glyph with unscaled offset (MS-style)
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("a", (0.5, 0, 0, 0.5, 10, 20))
        glyphSet["d"] = d = pen.glyph()
        d.components[0].flags |= UNSCALED_COMPONENT_OFFSET

        assert d.getCoordinates(glyphSet) == (
            GlyphCoordinates([(10, 20), (60, 20), (60, 70), (10, 70)]),
            [3],
            array.array("B", [1, 1, 1, 1]),
        )

        # composite glyph with a scaled offset (Apple-style)
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("a", (0.5, 0, 0, 0.5, 10, 20))
        glyphSet["e"] = e = pen.glyph()
        e.components[0].flags |= SCALED_COMPONENT_OFFSET

        assert e.getCoordinates(glyphSet) == (
            GlyphCoordinates([(5, 10), (55, 10), (55, 60), (5, 60)]),
            [3],
            array.array("B", [1, 1, 1, 1]),
        )

        # composite glyph where the 2nd and 3rd components use anchor points
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("a", (1, 0, 0, 1, 0, 0))
        glyphSet["f"] = f = pen.glyph()

        comp1 = GlyphComponent()
        comp1.glyphName = "a"
        # aling the new component's pt 0 to pt 2 of contour points added so far
        comp1.firstPt = 2
        comp1.secondPt = 0
        comp1.flags = 0
        f.components.append(comp1)

        comp2 = GlyphComponent()
        comp2.glyphName = "a"
        # aling the new component's pt 0 to pt 6 of contour points added so far
        comp2.firstPt = 6
        comp2.secondPt = 0
        comp2.transform = [[0.707107, 0.707107], [-0.707107, 0.707107]]  # rotate 45 deg
        comp2.flags = WE_HAVE_A_TWO_BY_TWO
        f.components.append(comp2)

        coords, end_pts, flags = f.getCoordinates(glyphSet)
        assert end_pts == [3, 7, 11]
        assert flags == array.array("B", [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1])
        assert list(sum(coords, ())) == pytest.approx(
            [
                0, 0,
                100, 0,
                100, 100,
                0, 100,
                100, 100,
                200, 100,
                200, 200,
                100, 200,
                200, 200,
                270.7107, 270.7107,
                200.0, 341.4214,
                129.2893, 270.7107,
            ]
        )

    def test_getCompositeMaxpValues(self):
        # https://github.com/fonttools/fonttools/issues/2044
        glyphSet = {}
        pen = TTGlyphPen(glyphSet)  # empty non-composite glyph
        glyphSet["fraction"] = pen.glyph()
        glyphSet["zero.numr"] = pen.glyph()
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("zero.numr", (1, 0, 0, 1, 0, 0))
        glyphSet["zero.dnom"] = pen.glyph()
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("zero.numr", (1, 0, 0, 1, 0, 0))
        pen.addComponent("fraction", (1, 0, 0, 1, 0, 0))
        pen.addComponent("zero.dnom", (1, 0, 0, 1, 0, 0))
        glyphSet["percent"] = pen.glyph()
        pen = TTGlyphPen(glyphSet)
        pen.addComponent("zero.numr", (1, 0, 0, 1, 0, 0))
        pen.addComponent("fraction", (1, 0, 0, 1, 0, 0))
        pen.addComponent("zero.dnom", (1, 0, 0, 1, 0, 0))
        pen.addComponent("zero.dnom", (1, 0, 0, 1, 0, 0))
        glyphSet["perthousand"] = pen.glyph()
        assert glyphSet["zero.dnom"].getCompositeMaxpValues(glyphSet)[2] == 1
        assert glyphSet["percent"].getCompositeMaxpValues(glyphSet)[2] == 2
        assert glyphSet["perthousand"].getCompositeMaxpValues(glyphSet)[2] == 2


class GlyphComponentTest:

    def test_toXML_no_transform(self):
        comp = GlyphComponent()
        comp.glyphName = "a"
        comp.flags = ARGS_ARE_XY_VALUES
        comp.x, comp.y = 1, 2

        assert getXML(comp.toXML) == [
            '<component glyphName="a" x="1" y="2" flags="0x2"/>'
        ]

    def test_toXML_transform_scale(self):
        comp = GlyphComponent()
        comp.glyphName = "a"
        comp.flags = ARGS_ARE_XY_VALUES | WE_HAVE_A_SCALE
        comp.x, comp.y = 1, 2

        comp.transform = [[0.2999878, 0], [0, 0.2999878]]
        assert getXML(comp.toXML) == [
            '<component glyphName="a" x="1" y="2" scale="0.3" flags="0xa"/>'
        ]

    def test_toXML_transform_xy_scale(self):
        comp = GlyphComponent()
        comp.glyphName = "a"
        comp.flags = ARGS_ARE_XY_VALUES | WE_HAVE_AN_X_AND_Y_SCALE
        comp.x, comp.y = 1, 2

        comp.transform = [[0.5999756, 0], [0, 0.2999878]]
        assert getXML(comp.toXML) == [
            '<component glyphName="a" x="1" y="2" scalex="0.6" '
            'scaley="0.3" flags="0x42"/>'
        ]

    def test_toXML_transform_2x2_scale(self):
        comp = GlyphComponent()
        comp.glyphName = "a"
        comp.flags = ARGS_ARE_XY_VALUES | WE_HAVE_A_TWO_BY_TWO
        comp.x, comp.y = 1, 2

        comp.transform = [[0.5999756, -0.2000122], [0.2000122, 0.2999878]]
        assert getXML(comp.toXML) == [
            '<component glyphName="a" x="1" y="2" scalex="0.6" scale01="-0.2" '
            'scale10="0.2" scaley="0.3" flags="0x82"/>'
        ]

    def test_fromXML_no_transform(self):
        comp = GlyphComponent()
        for name, attrs, content in parseXML(
            ['<component glyphName="a" x="1" y="2" flags="0x2"/>']
        ):
            comp.fromXML(name, attrs, content, ttFont=None)

        assert comp.glyphName == "a"
        assert comp.flags & ARGS_ARE_XY_VALUES != 0
        assert (comp.x, comp.y) == (1, 2)
        assert not hasattr(comp, "transform")

    def test_fromXML_transform_scale(self):
        comp = GlyphComponent()
        for name, attrs, content in parseXML(
            ['<component glyphName="a" x="1" y="2" scale="0.3" flags="0xa"/>']
        ):
            comp.fromXML(name, attrs, content, ttFont=None)

        assert comp.glyphName == "a"
        assert comp.flags & ARGS_ARE_XY_VALUES != 0
        assert comp.flags & WE_HAVE_A_SCALE != 0
        assert (comp.x, comp.y) == (1, 2)
        assert hasattr(comp, "transform")
        for value, expected in zip(
            itertools.chain(*comp.transform), [0.2999878, 0, 0, 0.2999878]
        ):
            assert value == pytest.approx(expected)

    def test_fromXML_transform_xy_scale(self):
        comp = GlyphComponent()
        for name, attrs, content in parseXML(
            [
                '<component glyphName="a" x="1" y="2" scalex="0.6" '
                'scaley="0.3" flags="0x42"/>'
            ]
        ):
            comp.fromXML(name, attrs, content, ttFont=None)

        assert comp.glyphName == "a"
        assert comp.flags & ARGS_ARE_XY_VALUES != 0
        assert comp.flags & WE_HAVE_AN_X_AND_Y_SCALE != 0
        assert (comp.x, comp.y) == (1, 2)
        assert hasattr(comp, "transform")
        for value, expected in zip(
            itertools.chain(*comp.transform), [0.5999756, 0, 0, 0.2999878]
        ):
            assert value == pytest.approx(expected)

    def test_fromXML_transform_2x2_scale(self):
        comp = GlyphComponent()
        for name, attrs, content in parseXML(
            [
                '<component glyphName="a" x="1" y="2" scalex="0.6" scale01="-0.2" '
                'scale10="0.2" scaley="0.3" flags="0x82"/>'
            ]
        ):
            comp.fromXML(name, attrs, content, ttFont=None)

        assert comp.glyphName == "a"
        assert comp.flags & ARGS_ARE_XY_VALUES != 0
        assert comp.flags & WE_HAVE_A_TWO_BY_TWO != 0
        assert (comp.x, comp.y) == (1, 2)
        assert hasattr(comp, "transform")
        for value, expected in zip(
            itertools.chain(*comp.transform),
            [0.5999756, -0.2000122, 0.2000122, 0.2999878]
        ):
            assert value == pytest.approx(expected)

    def test_toXML_reference_points(self):
        comp = GlyphComponent()
        comp.glyphName = "a"
        comp.flags = 0
        comp.firstPt = 1
        comp.secondPt = 2

        assert getXML(comp.toXML) == [
            '<component glyphName="a" firstPt="1" secondPt="2" flags="0x0"/>'
        ]

    def test_fromXML_reference_points(self):
        comp = GlyphComponent()
        for name, attrs, content in parseXML(
            ['<component glyphName="a" firstPt="1" secondPt="2" flags="0x0"/>']
        ):
            comp.fromXML(name, attrs, content, ttFont=None)

        assert comp.glyphName == "a"
        assert comp.flags == 0
        assert (comp.firstPt, comp.secondPt) == (1, 2)
        assert not hasattr(comp, "transform")


if __name__ == "__main__":
    import sys
    sys.exit(unittest.main())