[ttLib.removeOverlaps] Support CFF table
This commit is contained in:
Khaled Hosny
parent
a531041f3e
commit
2f9033b22d
@ -7,11 +7,14 @@ import itertools
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import logging
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from typing import Callable, Iterable, Optional, Mapping
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from fontTools.misc.roundTools import otRound
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from fontTools.cffLib import CFFFontSet
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from fontTools.ttLib import ttFont
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from fontTools.ttLib.tables import _g_l_y_f
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from fontTools.ttLib.tables import _h_m_t_x
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from fontTools.misc.psCharStrings import T2CharString
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from fontTools.misc.roundTools import otRound, noRound
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from fontTools.pens.ttGlyphPen import TTGlyphPen
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from fontTools.pens.t2CharStringPen import T2CharStringPen
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import pathops
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@ -81,6 +84,14 @@ def ttfGlyphFromSkPath(path: pathops.Path) -> _g_l_y_f.Glyph:
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return glyph
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def _charString_from_SkPath(
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path: pathops.Path, charString: T2CharString
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) -> T2CharString:
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t2Pen = T2CharStringPen(width=charString.width, glyphSet=None)
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path.draw(t2Pen)
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return t2Pen.getCharString(charString.private, charString.globalSubrs)
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def _round_path(
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path: pathops.Path, round: Callable[[float], float] = otRound
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) -> pathops.Path:
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@ -90,7 +101,11 @@ def _round_path(
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return rounded_path
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def _simplify(path: pathops.Path, debugGlyphName: str) -> pathops.Path:
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def _simplify(
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path: pathops.Path,
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debugGlyphName: str,
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round: Callable[[float], float] = otRound,
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) -> pathops.Path:
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# skia-pathops has a bug where it sometimes fails to simplify paths when there
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# are float coordinates and control points are very close to one another.
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# Rounding coordinates to integers works around the bug.
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@ -105,7 +120,7 @@ def _simplify(path: pathops.Path, debugGlyphName: str) -> pathops.Path:
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except pathops.PathOpsError:
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pass
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path = _round_path(path)
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path = _round_path(path, round=round)
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try:
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path = pathops.simplify(path, clockwise=path.clockwise)
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log.debug(
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@ -124,6 +139,10 @@ def _simplify(path: pathops.Path, debugGlyphName: str) -> pathops.Path:
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raise AssertionError("Unreachable")
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def _same_path(path1: pathops.Path, path2: pathops.Path) -> bool:
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return {tuple(c) for c in path1.contours} == {tuple(c) for c in path2.contours}
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def removeTTGlyphOverlaps(
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glyphName: str,
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glyphSet: _TTGlyphMapping,
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@ -144,7 +163,7 @@ def removeTTGlyphOverlaps(
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path2 = _simplify(path, glyphName)
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# replace TTGlyph if simplified path is different (ignoring contour order)
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if {tuple(c) for c in path.contours} != {tuple(c) for c in path2.contours}:
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if not _same_path(path, path2):
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glyfTable[glyphName] = glyph = ttfGlyphFromSkPath(path2)
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# simplified glyph is always unhinted
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assert not glyph.program
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@ -159,42 +178,15 @@ def removeTTGlyphOverlaps(
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return False
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def removeOverlaps(
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def _remove_glyf_overlaps(
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font: ttFont.TTFont,
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glyphNames: Optional[Iterable[str]] = None,
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removeHinting: bool = True,
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ignoreErrors=False,
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glyphNames: Iterable[str],
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glyphSet: _TTGlyphMapping,
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removeHinting: bool,
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ignoreErrors: bool,
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) -> None:
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"""Simplify glyphs in TTFont by merging overlapping contours.
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Overlapping components are first decomposed to simple contours, then merged.
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Currently this only works with TrueType fonts with 'glyf' table.
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Raises NotImplementedError if 'glyf' table is absent.
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Note that removing overlaps invalidates the hinting. By default we drop hinting
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from all glyphs whether or not overlaps are removed from a given one, as it would
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look weird if only some glyphs are left (un)hinted.
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Args:
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font: input TTFont object, modified in place.
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glyphNames: optional iterable of glyph names (str) to remove overlaps from.
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By default, all glyphs in the font are processed.
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removeHinting (bool): set to False to keep hinting for unmodified glyphs.
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ignoreErrors (bool): set to True to ignore errors while removing overlaps,
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thus keeping the tricky glyphs unchanged (fonttools/fonttools#2363).
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"""
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try:
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glyfTable = font["glyf"]
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except KeyError:
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raise NotImplementedError("removeOverlaps currently only works with TTFs")
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glyfTable = font["glyf"]
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hmtxTable = font["hmtx"]
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# wraps the underlying glyf Glyphs, takes care of interfacing with drawing pens
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glyphSet = font.getGlyphSet()
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if glyphNames is None:
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glyphNames = font.getGlyphOrder()
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# process all simple glyphs first, then composites with increasing component depth,
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# so that by the time we test for component intersections the respective base glyphs
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@ -225,6 +217,100 @@ def removeOverlaps(
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log.debug("Removed overlaps for %s glyphs:\n%s", len(modified), " ".join(modified))
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def _remove_charstring_overlaps(
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glyphName: str,
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glyphSet: _TTGlyphMapping,
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cffFontSet: CFFFontSet,
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removeHinting: bool,
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) -> bool:
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path = skPathFromGlyph(glyphName, glyphSet)
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# remove overlaps
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path2 = _simplify(path, glyphName, round=noRound)
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# replace TTGlyph if simplified path is different (ignoring contour order)
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if not _same_path(path, path2):
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charStrings = cffFontSet[0].CharStrings
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charStrings[glyphName] = _charString_from_SkPath(path2, charStrings[glyphName])
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return True
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if removeHinting:
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raise NotImplementedError(
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"Hinting removal is not implemented for CFF fonts yet"
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)
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return False
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def _remove_cff_overlaps(
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font: ttFont.TTFont,
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glyphNames: Iterable[str],
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glyphSet: _TTGlyphMapping,
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removeHinting: bool,
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ignoreErrors: bool,
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) -> None:
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cffFontSet = font["CFF "].cff
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modified = set()
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for glyphName in glyphNames:
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try:
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if _remove_charstring_overlaps(
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glyphName,
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glyphSet,
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cffFontSet,
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removeHinting,
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):
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modified.add(glyphName)
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except RemoveOverlapsError:
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if not ignoreErrors:
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raise
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log.error("Failed to remove overlaps for '%s'", glyphName)
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log.debug("Removed overlaps for %s glyphs:\n%s", len(modified), " ".join(modified))
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def removeOverlaps(
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font: ttFont.TTFont,
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glyphNames: Optional[Iterable[str]] = None,
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removeHinting: bool = True,
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ignoreErrors: bool = False,
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) -> None:
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"""Simplify glyphs in TTFont by merging overlapping contours.
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Overlapping components are first decomposed to simple contours, then merged.
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Currently this only works for fonts with 'glyf' or 'CFF ' tables.
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Raises NotImplementedError if 'glyf' or 'CFF ' tables are absent.
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Note that removing overlaps invalidates the hinting. By default we drop hinting
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from all glyphs whether or not overlaps are removed from a given one, as it would
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look weird if only some glyphs are left (un)hinted.
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Args:
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font: input TTFont object, modified in place.
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glyphNames: optional iterable of glyph names (str) to remove overlaps from.
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By default, all glyphs in the font are processed.
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removeHinting (bool): set to False to keep hinting for unmodified glyphs.
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ignoreErrors (bool): set to True to ignore errors while removing overlaps,
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thus keeping the tricky glyphs unchanged (fonttools/fonttools#2363).
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"""
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if "glyf" not in font and "CFF " not in font:
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raise NotImplementedError(
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"No outline data found in the font: missing 'glyf' or 'CFF ' table"
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)
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if glyphNames is None:
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glyphNames = font.getGlyphOrder()
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# Wraps the underlying glyphs, takes care of interfacing with drawing pens
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glyphSet = font.getGlyphSet()
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if "glyf" in font:
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_remove_glyf_overlaps(font, glyphNames, glyphSet, removeHinting, ignoreErrors)
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if "CFF " in font:
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_remove_cff_overlaps(font, glyphNames, glyphSet, removeHinting, ignoreErrors)
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def main(args=None):
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"""Simplify glyphs in TTFont by merging overlapping contours."""
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