fonttools/Tests/ttLib/tables/_a_v_a_r_test.py

from fontTools.misc.testTools import parseXML
from fontTools.misc.textTools import deHexStr
from fontTools.misc.xmlWriter import XMLWriter
from fontTools.misc.fixedTools import floatToFixed as fl2fi
from fontTools.pens.statisticsPen import StatisticsPen
from fontTools.ttLib import TTFont, TTLibError
import fontTools.ttLib.tables.otTables as otTables
from fontTools.ttLib.tables._a_v_a_r import table__a_v_a_r
from fontTools.ttLib.tables._f_v_a_r import table__f_v_a_r, Axis
import fontTools.varLib.models as models
import fontTools.varLib.varStore as varStore
from io import BytesIO
import os
import unittest


DATA_DIR = os.path.join(os.path.abspath(os.path.dirname(__file__)), "data")

TEST_DATA = deHexStr(
    "00 01 00 00 00 00 00 02 "
    "00 04 C0 00 C0 00 00 00 00 00 13 33 33 33 40 00 40 00 "
    "00 03 C0 00 C0 00 00 00 00 00 40 00 40 00"
)


class AxisVariationTableTest(unittest.TestCase):
    def assertAvarAlmostEqual(self, segments1, segments2):
        self.assertSetEqual(set(segments1.keys()), set(segments2.keys()))
        for axisTag, mapping1 in segments1.items():
            mapping2 = segments2[axisTag]
            self.assertEqual(len(mapping1), len(mapping2))
            for (k1, v1), (k2, v2) in zip(
                sorted(mapping1.items()), sorted(mapping2.items())
            ):
                self.assertAlmostEqual(k1, k2)
                self.assertAlmostEqual(v1, v2)

    def test_compile(self):
        avar = table__a_v_a_r()
        avar.segments["wdth"] = {-1.0: -1.0, 0.0: 0.0, 0.3: 0.8, 1.0: 1.0}
        avar.segments["wght"] = {-1.0: -1.0, 0.0: 0.0, 1.0: 1.0}
        self.assertEqual(TEST_DATA, avar.compile(self.makeFont(["wdth", "wght"])))

    def test_decompile(self):
        avar = table__a_v_a_r()
        avar.decompile(TEST_DATA, self.makeFont(["wdth", "wght"]))
        self.assertAvarAlmostEqual(
            {
                "wdth": {-1.0: -1.0, 0.0: 0.0, 0.2999878: 0.7999878, 1.0: 1.0},
                "wght": {-1.0: -1.0, 0.0: 0.0, 1.0: 1.0},
            },
            avar.segments,
        )

    def test_toXML(self):
        avar = table__a_v_a_r()
        avar.segments["opsz"] = {-1.0: -1.0, 0.0: 0.0, 0.2999878: 0.7999878, 1.0: 1.0}
        writer = XMLWriter(BytesIO())
        avar.toXML(writer, self.makeFont(["opsz"]))
        self.assertEqual(
            [
                '<version major="1" minor="0"/>',
                '<segment axis="opsz">',
                '<mapping from="-1.0" to="-1.0"/>',
                '<mapping from="0.0" to="0.0"/>',
                '<mapping from="0.3" to="0.8"/>',
                '<mapping from="1.0" to="1.0"/>',
                "</segment>",
            ],
            self.xml_lines(writer),
        )

    def test_fromXML(self):
        avar = table__a_v_a_r()
        for name, attrs, content in parseXML(
            '<segment axis="wdth">'
            '    <mapping from="-1.0" to="-1.0"/>'
            '    <mapping from="0.0" to="0.0"/>'
            '    <mapping from="0.7" to="0.2"/>'
            '    <mapping from="1.0" to="1.0"/>'
            "</segment>"
        ):
            avar.fromXML(name, attrs, content, ttFont=None)
        self.assertAvarAlmostEqual(
            {"wdth": {-1: -1, 0: 0, 0.7000122: 0.2000122, 1.0: 1.0}}, avar.segments
        )

    @staticmethod
    def makeFont(axisTags):
        """['opsz', 'wdth'] --> ttFont"""
        fvar = table__f_v_a_r()
        for tag in axisTags:
            axis = Axis()
            axis.axisTag = tag
            fvar.axes.append(axis)
        font = TTFont()
        font["fvar"] = fvar
        return font

    @staticmethod
    def xml_lines(writer):
        content = writer.file.getvalue().decode("utf-8")
        return [line.strip() for line in content.splitlines()][1:]


class Avar2Test(unittest.TestCase):
    def test_roundtrip(self):
        axisTags = ["wght", "wdth"]
        fvar = table__f_v_a_r()
        for tag in axisTags:
            axis = Axis()
            axis.axisTag = tag
            fvar.axes.append(axis)

        master_locations_normalized = [
            {},
            {"wght": 1, "wdth": -1},
        ]
        data = [
            {},
            {"wdth": -0.8},
        ]

        model = models.VariationModel(master_locations_normalized, axisTags)
        store_builder = varStore.OnlineVarStoreBuilder(axisTags)
        store_builder.setModel(model)
        varIdxes = {}
        for axis in axisTags:
            masters = [fl2fi(m.get(axis, 0), 14) for m in data]
            varIdxes[axis] = store_builder.storeMasters(masters)[1]
        store = store_builder.finish()
        mapping = store.optimize()
        varIdxes = {axis: mapping[value] for axis, value in varIdxes.items()}
        del model, store_builder, mapping

        varIdxMap = otTables.DeltaSetIndexMap()
        varIdxMap.Format = 1
        varIdxMap.mapping = []
        for tag in axisTags:
            varIdxMap.mapping.append(varIdxes[tag])

        avar = table__a_v_a_r()
        avar.segments["wght"] = {}
        avar.segments["wdth"] = {-1.0: -1.0, 0.0: 0.0, 0.4: 0.5, 1.0: 1.0}

        avar.majorVersion = 2
        avar.table = otTables.avar()
        avar.table.VarIdxMap = varIdxMap
        avar.table.VarStore = store

        font = TTFont()
        font["fvar"] = fvar
        font["avar"] = avar

        b = BytesIO()
        font.save(b)
        b.seek(0)
        font2 = TTFont(b)

        assert font2["avar"].table.VarStore.VarRegionList.RegionAxisCount == 2
        assert font2["avar"].table.VarStore.VarRegionList.RegionCount == 1

        xml1 = BytesIO()
        writer = XMLWriter(xml1)
        font["avar"].toXML(writer, font)

        xml2 = BytesIO()
        writer = XMLWriter(xml2)
        font2["avar"].toXML(writer, font2)

        assert xml1.getvalue() == xml2.getvalue(), (xml1.getvalue(), xml2.getvalue())

        avar = table__a_v_a_r()
        xml = b"".join(xml2.getvalue().splitlines()[1:])
        for name, attrs, content in parseXML(xml):
            avar.fromXML(name, attrs, content, ttFont=TTFont())
        assert avar.table.VarStore.VarRegionList.RegionAxisCount == 2
        assert avar.table.VarStore.VarRegionList.RegionCount == 1

    def test_ttGlyphSet(self):
        ttf = os.path.join(DATA_DIR, "Amstelvar-avar2.subset.ttf")
        font = TTFont(ttf)

        regular = font.getGlyphSet()
        black = font.getGlyphSet(location={"wght": 900})
        expanded = font.getGlyphSet(location={"wdth": 125})

        regularStats = StatisticsPen()
        blackStats = StatisticsPen()
        expandedStats = StatisticsPen()

        for glyph in "Test":
            regular[glyph].draw(regularStats)
            black[glyph].draw(blackStats)
            expanded[glyph].draw(expandedStats)

        assert abs(regularStats.area) < abs(blackStats.area)
        assert abs(expandedStats.area) < abs(blackStats.area)

        assert regularStats.meanX < expandedStats.meanX


if __name__ == "__main__":
    import sys

    sys.exit(unittest.main())