luaharfbuzz Documentation

## core_types.lua

    local harfbuzz = require('harfbuzz')
    local serpent  = require('serpent') -- luarocks install serpent

    -- Harfbuzz API Version
    print("Harfbuzz API version", harfbuzz.version())

    -- Shapers available
    print("Shapers:", serpent.line({ harfbuzz.shapers() }, {comment = false}))

    -- harfbuzz.Face
    local face = harfbuzz.Face.new('../fonts/notonastaliq.ttf')
    print('\nFace upem = '..face:get_upem())

    -- harfbuzz.Font
    local font = harfbuzz.Font.new(face)
    local xs, xy = font:get_scale()
    print("\nDefault font scale = X: "..xs..", Y: "..xy)

    -- harfbuzz.Buffer
    local text = "یہ" -- U+06CC U+06C1
    local buf = harfbuzz.Buffer.new()
    buf:add_utf8(text)

    -- harfbuzz.shape (Shapes text)
    print("\nShaping '"..text.."' set with Noto Nastaliq Urdu")
    harfbuzz.shape(font, buf, { language = harfbuzz.Language.new("urd"), script = harfbuzz.Script.new("Arab"), direction = harfbuzz.Direction.RTL})

    local glyphs = buf:get_glyphs()
    print("No. of glyphs", #glyphs)
    print(serpent.line(glyphs, {comment = false}))

    local opts = { language = harfbuzz.Language.new("eng"), script = harfbuzz.Script.new("Latn"), direction = harfbuzz.Direction.LTR }
    local amiri_face = harfbuzz.Face.new('../fonts/amiri-regular.ttf')
    local amiri_font = harfbuzz.Font.new(amiri_face)

    -- shaping '123' w/o features
    print("\nShaping '123' set with Amiri Regular and no features")
    buf= harfbuzz.Buffer.new()
    buf:add_utf8("123")
    harfbuzz.shape(amiri_font, buf, opts)
    glyphs = buf:get_glyphs()
    print(serpent.line(glyphs, {comment = false}))

    -- shaping '123' with '+numr' (numerators)
    print("\nShaping '123' set with Amiri Regular with 'numr' feature turned on")
    buf= harfbuzz.Buffer.new()
    buf:add_utf8("123")
    opts.features = "+numr"
    harfbuzz.shape(amiri_font, buf, opts)
    glyphs = buf:get_glyphs()
    print(serpent.line(glyphs, {comment = false}))

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