Font that can be used for validating baseline alignments.
sajidanwar.com/misc/baseline-diagnostic-font/
Add ascent/descent and baselines for vertical text layout
+28
-12
dist/BaselineDiagnostic.ttf
dist/BaselineDiagnostic.ttf
This is a binary file and will not be displayed.
dist/BaselineDiagnosticAlphabeticZero.ttf
dist/BaselineDiagnosticAlphabeticZero.ttf
This is a binary file and will not be displayed.
+24
-12
font.py
+24
-12
font.py
···
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from fontTools.ttLib import TTFont, getTableClass, newTable
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from fontTools.ttLib.tables import otTables
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EM_ASCENT = 800
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EM_DESCENT = 200
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EM_SIZE = EM_ASCENT + EM_DESCENT
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BORDER_WIDTH = 12
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···
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draw_dashed_line(pen, y, start, end, stroke_width=stroke_width)
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def draw_baseline(pen, font, y, label, style="solid", stroke_width=8):
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def draw_baseline(pen, font, y, em_size, label, style="solid", stroke_width=8):
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if label:
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drawn_text = draw_text_centered(
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pen, font, label, EM_SIZE / 2, y, font_size=50, scale_y=1, letter_gap=0
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pen, font, label, em_size / 2, y, font_size=50, scale_y=1, letter_gap=0
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)
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draw_line(
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pen,
···
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stroke_width=stroke_width,
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y=y,
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start=drawn_text.x + drawn_text.width + BORDER_WIDTH,
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end=EM_SIZE - BORDER_WIDTH,
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end=em_size - BORDER_WIDTH,
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)
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else:
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draw_line(
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stroke_width=stroke_width,
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y=y,
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start=BORDER_WIDTH,
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end=EM_SIZE - BORDER_WIDTH,
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end=em_size - BORDER_WIDTH,
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)
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def build_baselines_font(font_name: str, out_path: str, baselines: List[FontBaseline]):
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ascent = next(baseline.position for baseline in baselines if baseline.id == 'ascent')
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descent = next(baseline.position for baseline in baselines if baseline.id == 'descent')
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em_size = ascent - descent
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+
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if not ascent or not descent:
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raise ValueError(f"Required ascent / descent but got {ascent} / {descent}")
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empty_glyph_pen = TTGlyphPen(None)
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draw_bordered_rectangle(empty_glyph_pen, 0, -EM_DESCENT, EM_SIZE, EM_ASCENT, BORDER_WIDTH)
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draw_bordered_rectangle(empty_glyph_pen, 0, descent, em_size, ascent, BORDER_WIDTH)
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diag_glyph_pen = TTGlyphPen(None)
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draw_bordered_rectangle(diag_glyph_pen, 0, -EM_DESCENT, EM_SIZE, EM_ASCENT, BORDER_WIDTH)
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draw_bordered_rectangle(diag_glyph_pen, 0, descent, em_size, ascent, BORDER_WIDTH)
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label_font = TTFont("./support/noto/NotoSansMono-Bold.ttf")
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for baseline in baselines:
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if baseline.style:
···
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diag_glyph_pen,
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label_font,
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baseline.position,
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em_size,
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baseline.label,
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style=baseline.style.stroke_style,
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stroke_width=baseline.style.stroke_width,
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)
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fb = FontBuilder(EM_SIZE, isTTF=True)
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fb = FontBuilder(em_size, isTTF=True)
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fb.setupGlyphOrder([".notdef", "X"])
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fb.setupCharacterMap({ ord("X"): "X" })
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fb.setupGlyf({
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os2_values = dict((base.name, base.position) for base in baselines if base.table == "OS/2")
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hhea_values = dict((base.name, base.position) for base in baselines if base.table == "hhea")
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vhea_values = dict((base.name, base.position) for base in baselines if base.table == "vhea")
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style_name = "Regular"
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fb.setupPost()
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"psName": f"{font_name}-{style_name}",
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"version": "Version 1.0",
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})
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fb.setupHorizontalMetrics({".notdef": (EM_SIZE, 0), "X": (EM_SIZE, 0)})
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fb.setupHorizontalMetrics({".notdef": (em_size, 0), "X": (em_size, 0)})
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fb.setupOS2(**os2_values)
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fb.setupHorizontalHeader(**hhea_values)
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fb.setupHead(unitsPerEm=EM_SIZE)
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fb.setupVerticalHeader(**vhea_values)
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fb.setupHead(unitsPerEm=em_size)
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font = fb.font
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bases = list(sorted(filter(lambda base: base.table == "BASE", baselines), key=lambda base: base.name))
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base_table.HorizAxis.BaseTagList = otTables.BaseTagList()
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base_table.HorizAxis.BaseTagList.BaselineTag = base_names
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base_table.HorizAxis.BaseScriptList = otTables.BaseScriptList()
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base_table.VertAxis = otTables.Axis()
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base_table.VertAxis.BaseTagList = otTables.BaseTagList()
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base_table.VertAxis.BaseTagList.BaselineTag = base_names
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base_table.VertAxis.BaseScriptList = otTables.BaseScriptList()
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base_coords = []
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for base in bases:
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base_script.BaseScript.BaseValues.DefaultIndex = base_names.index("romn")
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base_script.BaseScript.BaseValues.BaseCoord = base_coords
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base_table.HorizAxis.BaseScriptList.BaseScriptRecord = [base_script]
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base_table.VertAxis.BaseScriptList.BaseScriptRecord = [base_script]
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font["BASE"] = newTable("BASE")
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font["BASE"].table = base_table
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+4
main.py
+4
main.py
···
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baselines=[
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FontBaseline("ascent", 800, "OS/2", "sTypoAscender", None, None),
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FontBaseline("ascent", 800, "hhea", "ascent", None, None),
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FontBaseline("ascent", 800, "vhea", "ascent", None, None),
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FontBaseline("ideographic-over", 750, "BASE", "idtp", "IDEOGRAPHIC-OVER", FontBaselineStyle.SOLID),
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FontBaseline("hanging", 650, "BASE", "hang", "HANGING", FontBaselineStyle.SOLID),
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FontBaseline("cap-height", 550, "OS/2", "sCapHeight", "CAP-HEIGHT", FontBaselineStyle.SOLID),
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FontBaseline("ideographic-under", -50, "BASE", "ideo", "IDEOGRAPHIC-UNDER", FontBaselineStyle.SOLID),
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FontBaseline("descent", -200, "OS/2", "sTypoDescender", None, None),
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FontBaseline("descent", -200, "hhea", "descent", None, None),
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FontBaseline("descent", -200, "vhea", "descent", None, None),
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]
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))
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fonts.append(Font(
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baselines=[
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FontBaseline("ascent", 800, "OS/2", "sTypoAscender", None, None),
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FontBaseline("ascent", 800, "hhea", "ascent", None, None),
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FontBaseline("ascent", 800, "vhea", "ascent", None, None),
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FontBaseline("ideographic-over", 750, "BASE", "idtp", "IDEOGRAPHIC-OVER", FontBaselineStyle.SOLID),
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FontBaseline("hanging", 650, "BASE", "hang", "HANGING", FontBaselineStyle.SOLID),
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FontBaseline("cap-height", 550, "OS/2", "sCapHeight", "CAP-HEIGHT", FontBaselineStyle.SOLID),
···
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FontBaseline("ideographic-under", -50, "BASE", "ideo", "IDEOGRAPHIC-UNDER", FontBaselineStyle.SOLID),
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FontBaseline("descent", -200, "OS/2", "sTypoDescender", None, None),
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FontBaseline("descent", -200, "hhea", "descent", None, None),
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FontBaseline("descent", -200, "vhea", "descent", None, None),
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]
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))
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