ajout fichiers manquant
This commit is contained in:
Ambulance Clerc
248
venv/Lib/site-packages/fontTools/ttLib/removeOverlaps.py
Normal file
248
venv/Lib/site-packages/fontTools/ttLib/removeOverlaps.py
Normal file
@@ -0,0 +1,248 @@
|
||||
""" Simplify TrueType glyphs by merging overlapping contours/components.
|
||||
|
||||
Requires https://github.com/fonttools/skia-pathops
|
||||
"""
|
||||
|
||||
import itertools
|
||||
import logging
|
||||
from typing import Callable, Iterable, Optional, Mapping
|
||||
|
||||
from fontTools.misc.roundTools import otRound
|
||||
from fontTools.ttLib import ttFont
|
||||
from fontTools.ttLib.tables import _g_l_y_f
|
||||
from fontTools.ttLib.tables import _h_m_t_x
|
||||
from fontTools.pens.ttGlyphPen import TTGlyphPen
|
||||
|
||||
import pathops
|
||||
|
||||
|
||||
__all__ = ["removeOverlaps"]
|
||||
|
||||
|
||||
class RemoveOverlapsError(Exception):
|
||||
pass
|
||||
|
||||
|
||||
log = logging.getLogger("fontTools.ttLib.removeOverlaps")
|
||||
|
||||
_TTGlyphMapping = Mapping[str, ttFont._TTGlyph]
|
||||
|
||||
|
||||
def skPathFromGlyph(glyphName: str, glyphSet: _TTGlyphMapping) -> pathops.Path:
|
||||
path = pathops.Path()
|
||||
pathPen = path.getPen(glyphSet=glyphSet)
|
||||
glyphSet[glyphName].draw(pathPen)
|
||||
return path
|
||||
|
||||
|
||||
def skPathFromGlyphComponent(
|
||||
component: _g_l_y_f.GlyphComponent, glyphSet: _TTGlyphMapping
|
||||
):
|
||||
baseGlyphName, transformation = component.getComponentInfo()
|
||||
path = skPathFromGlyph(baseGlyphName, glyphSet)
|
||||
return path.transform(*transformation)
|
||||
|
||||
|
||||
def componentsOverlap(glyph: _g_l_y_f.Glyph, glyphSet: _TTGlyphMapping) -> bool:
|
||||
if not glyph.isComposite():
|
||||
raise ValueError("This method only works with TrueType composite glyphs")
|
||||
if len(glyph.components) < 2:
|
||||
return False # single component, no overlaps
|
||||
|
||||
component_paths = {}
|
||||
|
||||
def _get_nth_component_path(index: int) -> pathops.Path:
|
||||
if index not in component_paths:
|
||||
component_paths[index] = skPathFromGlyphComponent(
|
||||
glyph.components[index], glyphSet
|
||||
)
|
||||
return component_paths[index]
|
||||
|
||||
return any(
|
||||
pathops.op(
|
||||
_get_nth_component_path(i),
|
||||
_get_nth_component_path(j),
|
||||
pathops.PathOp.INTERSECTION,
|
||||
fix_winding=False,
|
||||
keep_starting_points=False,
|
||||
)
|
||||
for i, j in itertools.combinations(range(len(glyph.components)), 2)
|
||||
)
|
||||
|
||||
|
||||
def ttfGlyphFromSkPath(path: pathops.Path) -> _g_l_y_f.Glyph:
|
||||
# Skia paths have no 'components', no need for glyphSet
|
||||
ttPen = TTGlyphPen(glyphSet=None)
|
||||
path.draw(ttPen)
|
||||
glyph = ttPen.glyph()
|
||||
assert not glyph.isComposite()
|
||||
# compute glyph.xMin (glyfTable parameter unused for non composites)
|
||||
glyph.recalcBounds(glyfTable=None)
|
||||
return glyph
|
||||
|
||||
|
||||
def _round_path(
|
||||
path: pathops.Path, round: Callable[[float], float] = otRound
|
||||
) -> pathops.Path:
|
||||
rounded_path = pathops.Path()
|
||||
for verb, points in path:
|
||||
rounded_path.add(verb, *((round(p[0]), round(p[1])) for p in points))
|
||||
return rounded_path
|
||||
|
||||
|
||||
def _simplify(path: pathops.Path, debugGlyphName: str) -> pathops.Path:
|
||||
# skia-pathops has a bug where it sometimes fails to simplify paths when there
|
||||
# are float coordinates and control points are very close to one another.
|
||||
# Rounding coordinates to integers works around the bug.
|
||||
# Since we are going to round glyf coordinates later on anyway, here it is
|
||||
# ok(-ish) to also round before simplify. Better than failing the whole process
|
||||
# for the entire font.
|
||||
# https://bugs.chromium.org/p/skia/issues/detail?id=11958
|
||||
# https://github.com/google/fonts/issues/3365
|
||||
# TODO(anthrotype): remove once this Skia bug is fixed
|
||||
try:
|
||||
return pathops.simplify(path, clockwise=path.clockwise)
|
||||
except pathops.PathOpsError:
|
||||
pass
|
||||
|
||||
path = _round_path(path)
|
||||
try:
|
||||
path = pathops.simplify(path, clockwise=path.clockwise)
|
||||
log.debug(
|
||||
"skia-pathops failed to simplify '%s' with float coordinates, "
|
||||
"but succeded using rounded integer coordinates",
|
||||
debugGlyphName,
|
||||
)
|
||||
return path
|
||||
except pathops.PathOpsError as e:
|
||||
if log.isEnabledFor(logging.DEBUG):
|
||||
path.dump()
|
||||
raise RemoveOverlapsError(
|
||||
f"Failed to remove overlaps from glyph {debugGlyphName!r}"
|
||||
) from e
|
||||
|
||||
raise AssertionError("Unreachable")
|
||||
|
||||
|
||||
def removeTTGlyphOverlaps(
|
||||
glyphName: str,
|
||||
glyphSet: _TTGlyphMapping,
|
||||
glyfTable: _g_l_y_f.table__g_l_y_f,
|
||||
hmtxTable: _h_m_t_x.table__h_m_t_x,
|
||||
removeHinting: bool = True,
|
||||
) -> bool:
|
||||
glyph = glyfTable[glyphName]
|
||||
# decompose composite glyphs only if components overlap each other
|
||||
if (
|
||||
glyph.numberOfContours > 0
|
||||
or glyph.isComposite()
|
||||
and componentsOverlap(glyph, glyphSet)
|
||||
):
|
||||
path = skPathFromGlyph(glyphName, glyphSet)
|
||||
|
||||
# remove overlaps
|
||||
path2 = _simplify(path, glyphName)
|
||||
|
||||
# replace TTGlyph if simplified path is different (ignoring contour order)
|
||||
if {tuple(c) for c in path.contours} != {tuple(c) for c in path2.contours}:
|
||||
glyfTable[glyphName] = glyph = ttfGlyphFromSkPath(path2)
|
||||
# simplified glyph is always unhinted
|
||||
assert not glyph.program
|
||||
# also ensure hmtx LSB == glyph.xMin so glyph origin is at x=0
|
||||
width, lsb = hmtxTable[glyphName]
|
||||
if lsb != glyph.xMin:
|
||||
hmtxTable[glyphName] = (width, glyph.xMin)
|
||||
return True
|
||||
|
||||
if removeHinting:
|
||||
glyph.removeHinting()
|
||||
return False
|
||||
|
||||
|
||||
def removeOverlaps(
|
||||
font: ttFont.TTFont,
|
||||
glyphNames: Optional[Iterable[str]] = None,
|
||||
removeHinting: bool = True,
|
||||
ignoreErrors=False,
|
||||
) -> None:
|
||||
"""Simplify glyphs in TTFont by merging overlapping contours.
|
||||
|
||||
Overlapping components are first decomposed to simple contours, then merged.
|
||||
|
||||
Currently this only works with TrueType fonts with 'glyf' table.
|
||||
Raises NotImplementedError if 'glyf' table is absent.
|
||||
|
||||
Note that removing overlaps invalidates the hinting. By default we drop hinting
|
||||
from all glyphs whether or not overlaps are removed from a given one, as it would
|
||||
look weird if only some glyphs are left (un)hinted.
|
||||
|
||||
Args:
|
||||
font: input TTFont object, modified in place.
|
||||
glyphNames: optional iterable of glyph names (str) to remove overlaps from.
|
||||
By default, all glyphs in the font are processed.
|
||||
removeHinting (bool): set to False to keep hinting for unmodified glyphs.
|
||||
ignoreErrors (bool): set to True to ignore errors while removing overlaps,
|
||||
thus keeping the tricky glyphs unchanged (fonttools/fonttools#2363).
|
||||
"""
|
||||
try:
|
||||
glyfTable = font["glyf"]
|
||||
except KeyError:
|
||||
raise NotImplementedError("removeOverlaps currently only works with TTFs")
|
||||
|
||||
hmtxTable = font["hmtx"]
|
||||
# wraps the underlying glyf Glyphs, takes care of interfacing with drawing pens
|
||||
glyphSet = font.getGlyphSet()
|
||||
|
||||
if glyphNames is None:
|
||||
glyphNames = font.getGlyphOrder()
|
||||
|
||||
# process all simple glyphs first, then composites with increasing component depth,
|
||||
# so that by the time we test for component intersections the respective base glyphs
|
||||
# have already been simplified
|
||||
glyphNames = sorted(
|
||||
glyphNames,
|
||||
key=lambda name: (
|
||||
glyfTable[name].getCompositeMaxpValues(glyfTable).maxComponentDepth
|
||||
if glyfTable[name].isComposite()
|
||||
else 0,
|
||||
name,
|
||||
),
|
||||
)
|
||||
modified = set()
|
||||
for glyphName in glyphNames:
|
||||
try:
|
||||
if removeTTGlyphOverlaps(
|
||||
glyphName, glyphSet, glyfTable, hmtxTable, removeHinting
|
||||
):
|
||||
modified.add(glyphName)
|
||||
except RemoveOverlapsError:
|
||||
if not ignoreErrors:
|
||||
raise
|
||||
log.error("Failed to remove overlaps for '%s'", glyphName)
|
||||
|
||||
log.debug("Removed overlaps for %s glyphs:\n%s", len(modified), " ".join(modified))
|
||||
|
||||
|
||||
def main(args=None):
|
||||
import sys
|
||||
|
||||
if args is None:
|
||||
args = sys.argv[1:]
|
||||
|
||||
if len(args) < 2:
|
||||
print(
|
||||
f"usage: fonttools ttLib.removeOverlaps INPUT.ttf OUTPUT.ttf [GLYPHS ...]"
|
||||
)
|
||||
sys.exit(1)
|
||||
|
||||
src = args[0]
|
||||
dst = args[1]
|
||||
glyphNames = args[2:] or None
|
||||
|
||||
with ttFont.TTFont(src) as f:
|
||||
removeOverlaps(f, glyphNames)
|
||||
f.save(dst)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user