/usr/lib/python2.7/dist-packages/FontTools/fontTools/ttLib/tables/_g_l_y_f.py is in fonttools 3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 | """_g_l_y_f.py -- Converter classes for the 'glyf' table."""
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.misc import sstruct
from fontTools import ttLib
from fontTools.misc.textTools import safeEval, pad
from fontTools.misc.arrayTools import calcBounds, calcIntBounds, pointInRect
from fontTools.misc.bezierTools import calcQuadraticBounds
from fontTools.misc.fixedTools import fixedToFloat as fi2fl, floatToFixed as fl2fi
from . import DefaultTable
from . import ttProgram
import sys
import struct
import array
import warnings
#
# The Apple and MS rasterizers behave differently for
# scaled composite components: one does scale first and then translate
# and the other does it vice versa. MS defined some flags to indicate
# the difference, but it seems nobody actually _sets_ those flags.
#
# Funny thing: Apple seems to _only_ do their thing in the
# WE_HAVE_A_SCALE (eg. Chicago) case, and not when it's WE_HAVE_AN_X_AND_Y_SCALE
# (eg. Charcoal)...
#
SCALE_COMPONENT_OFFSET_DEFAULT = 0 # 0 == MS, 1 == Apple
class table__g_l_y_f(DefaultTable.DefaultTable):
def decompile(self, data, ttFont):
loca = ttFont['loca']
last = int(loca[0])
noname = 0
self.glyphs = {}
self.glyphOrder = glyphOrder = ttFont.getGlyphOrder()
for i in range(0, len(loca)-1):
try:
glyphName = glyphOrder[i]
except IndexError:
noname = noname + 1
glyphName = 'ttxautoglyph%s' % i
next = int(loca[i+1])
glyphdata = data[last:next]
if len(glyphdata) != (next - last):
raise ttLib.TTLibError("not enough 'glyf' table data")
glyph = Glyph(glyphdata)
self.glyphs[glyphName] = glyph
last = next
if len(data) - next >= 4:
warnings.warn("too much 'glyf' table data: expected %d, received %d bytes" %
(next, len(data)))
if noname:
warnings.warn('%s glyphs have no name' % noname)
if ttFont.lazy is False: # Be lazy for None and True
for glyph in self.glyphs.values():
glyph.expand(self)
def compile(self, ttFont):
if not hasattr(self, "glyphOrder"):
self.glyphOrder = ttFont.getGlyphOrder()
padding = self.padding if hasattr(self, 'padding') else None
locations = []
currentLocation = 0
dataList = []
recalcBBoxes = ttFont.recalcBBoxes
for glyphName in self.glyphOrder:
glyph = self.glyphs[glyphName]
glyphData = glyph.compile(self, recalcBBoxes)
if padding:
glyphData = pad(glyphData, size=padding)
locations.append(currentLocation)
currentLocation = currentLocation + len(glyphData)
dataList.append(glyphData)
locations.append(currentLocation)
if padding is None and currentLocation < 0x20000:
# See if we can pad any odd-lengthed glyphs to allow loca
# table to use the short offsets.
indices = [i for i,glyphData in enumerate(dataList) if len(glyphData) % 2 == 1]
if indices and currentLocation + len(indices) < 0x20000:
# It fits. Do it.
for i in indices:
dataList[i] += b'\0'
currentLocation = 0
for i,glyphData in enumerate(dataList):
locations[i] = currentLocation
currentLocation += len(glyphData)
locations[len(dataList)] = currentLocation
data = bytesjoin(dataList)
if 'loca' in ttFont:
ttFont['loca'].set(locations)
if 'maxp' in ttFont:
ttFont['maxp'].numGlyphs = len(self.glyphs)
return data
def toXML(self, writer, ttFont, progress=None):
writer.newline()
glyphNames = ttFont.getGlyphNames()
writer.comment("The xMin, yMin, xMax and yMax values\nwill be recalculated by the compiler.")
writer.newline()
writer.newline()
counter = 0
progressStep = 10
numGlyphs = len(glyphNames)
for glyphName in glyphNames:
if not counter % progressStep and progress is not None:
progress.setLabel("Dumping 'glyf' table... (%s)" % glyphName)
progress.increment(progressStep / numGlyphs)
counter = counter + 1
glyph = self[glyphName]
if glyph.numberOfContours:
writer.begintag('TTGlyph', [
("name", glyphName),
("xMin", glyph.xMin),
("yMin", glyph.yMin),
("xMax", glyph.xMax),
("yMax", glyph.yMax),
])
writer.newline()
glyph.toXML(writer, ttFont)
writer.endtag('TTGlyph')
writer.newline()
else:
writer.simpletag('TTGlyph', name=glyphName)
writer.comment("contains no outline data")
writer.newline()
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name != "TTGlyph":
return
if not hasattr(self, "glyphs"):
self.glyphs = {}
if not hasattr(self, "glyphOrder"):
self.glyphOrder = ttFont.getGlyphOrder()
glyphName = attrs["name"]
if ttFont.verbose:
ttLib.debugmsg("unpacking glyph '%s'" % glyphName)
glyph = Glyph()
for attr in ['xMin', 'yMin', 'xMax', 'yMax']:
setattr(glyph, attr, safeEval(attrs.get(attr, '0')))
self.glyphs[glyphName] = glyph
for element in content:
if not isinstance(element, tuple):
continue
name, attrs, content = element
glyph.fromXML(name, attrs, content, ttFont)
if not ttFont.recalcBBoxes:
glyph.compact(self, 0)
def setGlyphOrder(self, glyphOrder):
self.glyphOrder = glyphOrder
def getGlyphName(self, glyphID):
return self.glyphOrder[glyphID]
def getGlyphID(self, glyphName):
# XXX optimize with reverse dict!!!
return self.glyphOrder.index(glyphName)
def keys(self):
return self.glyphs.keys()
def has_key(self, glyphName):
return glyphName in self.glyphs
__contains__ = has_key
def __getitem__(self, glyphName):
glyph = self.glyphs[glyphName]
glyph.expand(self)
return glyph
def __setitem__(self, glyphName, glyph):
self.glyphs[glyphName] = glyph
if glyphName not in self.glyphOrder:
self.glyphOrder.append(glyphName)
def __delitem__(self, glyphName):
del self.glyphs[glyphName]
self.glyphOrder.remove(glyphName)
def __len__(self):
assert len(self.glyphOrder) == len(self.glyphs)
return len(self.glyphs)
glyphHeaderFormat = """
> # big endian
numberOfContours: h
xMin: h
yMin: h
xMax: h
yMax: h
"""
# flags
flagOnCurve = 0x01
flagXShort = 0x02
flagYShort = 0x04
flagRepeat = 0x08
flagXsame = 0x10
flagYsame = 0x20
flagReserved1 = 0x40
flagReserved2 = 0x80
_flagSignBytes = {
0: 2,
flagXsame: 0,
flagXShort|flagXsame: +1,
flagXShort: -1,
flagYsame: 0,
flagYShort|flagYsame: +1,
flagYShort: -1,
}
def flagBest(x, y, onCurve):
"""For a given x,y delta pair, returns the flag that packs this pair
most efficiently, as well as the number of byte cost of such flag."""
flag = flagOnCurve if onCurve else 0
cost = 0
# do x
if x == 0:
flag = flag | flagXsame
elif -255 <= x <= 255:
flag = flag | flagXShort
if x > 0:
flag = flag | flagXsame
cost += 1
else:
cost += 2
# do y
if y == 0:
flag = flag | flagYsame
elif -255 <= y <= 255:
flag = flag | flagYShort
if y > 0:
flag = flag | flagYsame
cost += 1
else:
cost += 2
return flag, cost
def flagFits(newFlag, oldFlag, mask):
newBytes = _flagSignBytes[newFlag & mask]
oldBytes = _flagSignBytes[oldFlag & mask]
return newBytes == oldBytes or abs(newBytes) > abs(oldBytes)
def flagSupports(newFlag, oldFlag):
return ((oldFlag & flagOnCurve) == (newFlag & flagOnCurve) and
flagFits(newFlag, oldFlag, flagXsame|flagXShort) and
flagFits(newFlag, oldFlag, flagYsame|flagYShort))
def flagEncodeCoord(flag, mask, coord, coordBytes):
byteCount = _flagSignBytes[flag & mask]
if byteCount == 1:
coordBytes.append(coord)
elif byteCount == -1:
coordBytes.append(-coord)
elif byteCount == 2:
coordBytes.append((coord >> 8) & 0xFF)
coordBytes.append(coord & 0xFF)
def flagEncodeCoords(flag, x, y, xBytes, yBytes):
flagEncodeCoord(flag, flagXsame|flagXShort, x, xBytes)
flagEncodeCoord(flag, flagYsame|flagYShort, y, yBytes)
ARG_1_AND_2_ARE_WORDS = 0x0001 # if set args are words otherwise they are bytes
ARGS_ARE_XY_VALUES = 0x0002 # if set args are xy values, otherwise they are points
ROUND_XY_TO_GRID = 0x0004 # for the xy values if above is true
WE_HAVE_A_SCALE = 0x0008 # Sx = Sy, otherwise scale == 1.0
NON_OVERLAPPING = 0x0010 # set to same value for all components (obsolete!)
MORE_COMPONENTS = 0x0020 # indicates at least one more glyph after this one
WE_HAVE_AN_X_AND_Y_SCALE = 0x0040 # Sx, Sy
WE_HAVE_A_TWO_BY_TWO = 0x0080 # t00, t01, t10, t11
WE_HAVE_INSTRUCTIONS = 0x0100 # instructions follow
USE_MY_METRICS = 0x0200 # apply these metrics to parent glyph
OVERLAP_COMPOUND = 0x0400 # used by Apple in GX fonts
SCALED_COMPONENT_OFFSET = 0x0800 # composite designed to have the component offset scaled (designed for Apple)
UNSCALED_COMPONENT_OFFSET = 0x1000 # composite designed not to have the component offset scaled (designed for MS)
class Glyph(object):
def __init__(self, data=""):
if not data:
# empty char
self.numberOfContours = 0
return
self.data = data
def compact(self, glyfTable, recalcBBoxes=True):
data = self.compile(glyfTable, recalcBBoxes)
self.__dict__.clear()
self.data = data
def expand(self, glyfTable):
if not hasattr(self, "data"):
# already unpacked
return
if not self.data:
# empty char
self.numberOfContours = 0
return
dummy, data = sstruct.unpack2(glyphHeaderFormat, self.data, self)
del self.data
if self.isComposite():
self.decompileComponents(data, glyfTable)
else:
self.decompileCoordinates(data)
def compile(self, glyfTable, recalcBBoxes=True):
if hasattr(self, "data"):
return self.data
if self.numberOfContours == 0:
return ""
if recalcBBoxes:
self.recalcBounds(glyfTable)
data = sstruct.pack(glyphHeaderFormat, self)
if self.isComposite():
data = data + self.compileComponents(glyfTable)
else:
data = data + self.compileCoordinates()
return data
def toXML(self, writer, ttFont):
if self.isComposite():
for compo in self.components:
compo.toXML(writer, ttFont)
if hasattr(self, "program"):
writer.begintag("instructions")
self.program.toXML(writer, ttFont)
writer.endtag("instructions")
writer.newline()
else:
last = 0
for i in range(self.numberOfContours):
writer.begintag("contour")
writer.newline()
for j in range(last, self.endPtsOfContours[i] + 1):
writer.simpletag("pt", [
("x", self.coordinates[j][0]),
("y", self.coordinates[j][1]),
("on", self.flags[j] & flagOnCurve)])
writer.newline()
last = self.endPtsOfContours[i] + 1
writer.endtag("contour")
writer.newline()
if self.numberOfContours:
writer.begintag("instructions")
self.program.toXML(writer, ttFont)
writer.endtag("instructions")
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
if name == "contour":
if self.numberOfContours < 0:
raise ttLib.TTLibError("can't mix composites and contours in glyph")
self.numberOfContours = self.numberOfContours + 1
coordinates = GlyphCoordinates()
flags = []
for element in content:
if not isinstance(element, tuple):
continue
name, attrs, content = element
if name != "pt":
continue # ignore anything but "pt"
coordinates.append((safeEval(attrs["x"]), safeEval(attrs["y"])))
flags.append(not not safeEval(attrs["on"]))
flags = array.array("B", flags)
if not hasattr(self, "coordinates"):
self.coordinates = coordinates
self.flags = flags
self.endPtsOfContours = [len(coordinates)-1]
else:
self.coordinates.extend (coordinates)
self.flags.extend(flags)
self.endPtsOfContours.append(len(self.coordinates)-1)
elif name == "component":
if self.numberOfContours > 0:
raise ttLib.TTLibError("can't mix composites and contours in glyph")
self.numberOfContours = -1
if not hasattr(self, "components"):
self.components = []
component = GlyphComponent()
self.components.append(component)
component.fromXML(name, attrs, content, ttFont)
elif name == "instructions":
self.program = ttProgram.Program()
for element in content:
if not isinstance(element, tuple):
continue
name, attrs, content = element
self.program.fromXML(name, attrs, content, ttFont)
def getCompositeMaxpValues(self, glyfTable, maxComponentDepth=1):
assert self.isComposite()
nContours = 0
nPoints = 0
for compo in self.components:
baseGlyph = glyfTable[compo.glyphName]
if baseGlyph.numberOfContours == 0:
continue
elif baseGlyph.numberOfContours > 0:
nP, nC = baseGlyph.getMaxpValues()
else:
nP, nC, maxComponentDepth = baseGlyph.getCompositeMaxpValues(
glyfTable, maxComponentDepth + 1)
nPoints = nPoints + nP
nContours = nContours + nC
return nPoints, nContours, maxComponentDepth
def getMaxpValues(self):
assert self.numberOfContours > 0
return len(self.coordinates), len(self.endPtsOfContours)
def decompileComponents(self, data, glyfTable):
self.components = []
more = 1
haveInstructions = 0
while more:
component = GlyphComponent()
more, haveInstr, data = component.decompile(data, glyfTable)
haveInstructions = haveInstructions | haveInstr
self.components.append(component)
if haveInstructions:
numInstructions, = struct.unpack(">h", data[:2])
data = data[2:]
self.program = ttProgram.Program()
self.program.fromBytecode(data[:numInstructions])
data = data[numInstructions:]
if len(data) >= 4:
warnings.warn("too much glyph data at the end of composite glyph: %d excess bytes" % len(data))
def decompileCoordinates(self, data):
endPtsOfContours = array.array("h")
endPtsOfContours.fromstring(data[:2*self.numberOfContours])
if sys.byteorder != "big":
endPtsOfContours.byteswap()
self.endPtsOfContours = endPtsOfContours.tolist()
data = data[2*self.numberOfContours:]
instructionLength, = struct.unpack(">h", data[:2])
data = data[2:]
self.program = ttProgram.Program()
self.program.fromBytecode(data[:instructionLength])
data = data[instructionLength:]
nCoordinates = self.endPtsOfContours[-1] + 1
flags, xCoordinates, yCoordinates = \
self.decompileCoordinatesRaw(nCoordinates, data)
# fill in repetitions and apply signs
self.coordinates = coordinates = GlyphCoordinates.zeros(nCoordinates)
xIndex = 0
yIndex = 0
for i in range(nCoordinates):
flag = flags[i]
# x coordinate
if flag & flagXShort:
if flag & flagXsame:
x = xCoordinates[xIndex]
else:
x = -xCoordinates[xIndex]
xIndex = xIndex + 1
elif flag & flagXsame:
x = 0
else:
x = xCoordinates[xIndex]
xIndex = xIndex + 1
# y coordinate
if flag & flagYShort:
if flag & flagYsame:
y = yCoordinates[yIndex]
else:
y = -yCoordinates[yIndex]
yIndex = yIndex + 1
elif flag & flagYsame:
y = 0
else:
y = yCoordinates[yIndex]
yIndex = yIndex + 1
coordinates[i] = (x, y)
assert xIndex == len(xCoordinates)
assert yIndex == len(yCoordinates)
coordinates.relativeToAbsolute()
# discard all flags but for "flagOnCurve"
self.flags = array.array("B", (f & flagOnCurve for f in flags))
def decompileCoordinatesRaw(self, nCoordinates, data):
# unpack flags and prepare unpacking of coordinates
flags = array.array("B", [0] * nCoordinates)
# Warning: deep Python trickery going on. We use the struct module to unpack
# the coordinates. We build a format string based on the flags, so we can
# unpack the coordinates in one struct.unpack() call.
xFormat = ">" # big endian
yFormat = ">" # big endian
i = j = 0
while True:
flag = byteord(data[i])
i = i + 1
repeat = 1
if flag & flagRepeat:
repeat = byteord(data[i]) + 1
i = i + 1
for k in range(repeat):
if flag & flagXShort:
xFormat = xFormat + 'B'
elif not (flag & flagXsame):
xFormat = xFormat + 'h'
if flag & flagYShort:
yFormat = yFormat + 'B'
elif not (flag & flagYsame):
yFormat = yFormat + 'h'
flags[j] = flag
j = j + 1
if j >= nCoordinates:
break
assert j == nCoordinates, "bad glyph flags"
data = data[i:]
# unpack raw coordinates, krrrrrr-tching!
xDataLen = struct.calcsize(xFormat)
yDataLen = struct.calcsize(yFormat)
if len(data) - (xDataLen + yDataLen) >= 4:
warnings.warn("too much glyph data: %d excess bytes" % (len(data) - (xDataLen + yDataLen)))
xCoordinates = struct.unpack(xFormat, data[:xDataLen])
yCoordinates = struct.unpack(yFormat, data[xDataLen:xDataLen+yDataLen])
return flags, xCoordinates, yCoordinates
def compileComponents(self, glyfTable):
data = b""
lastcomponent = len(self.components) - 1
more = 1
haveInstructions = 0
for i in range(len(self.components)):
if i == lastcomponent:
haveInstructions = hasattr(self, "program")
more = 0
compo = self.components[i]
data = data + compo.compile(more, haveInstructions, glyfTable)
if haveInstructions:
instructions = self.program.getBytecode()
data = data + struct.pack(">h", len(instructions)) + instructions
return data
def compileCoordinates(self):
assert len(self.coordinates) == len(self.flags)
data = []
endPtsOfContours = array.array("h", self.endPtsOfContours)
if sys.byteorder != "big":
endPtsOfContours.byteswap()
data.append(endPtsOfContours.tostring())
instructions = self.program.getBytecode()
data.append(struct.pack(">h", len(instructions)))
data.append(instructions)
deltas = self.coordinates.copy()
if deltas.isFloat():
# Warn?
xPoints = [int(round(x)) for x in xPoints]
yPoints = [int(round(y)) for y in xPoints]
deltas.absoluteToRelative()
# TODO(behdad): Add a configuration option for this?
deltas = self.compileDeltasGreedy(self.flags, deltas)
#deltas = self.compileDeltasOptimal(self.flags, deltas)
data.extend(deltas)
return bytesjoin(data)
def compileDeltasGreedy(self, flags, deltas):
# Implements greedy algorithm for packing coordinate deltas:
# uses shortest representation one coordinate at a time.
compressedflags = []
xPoints = []
yPoints = []
lastflag = None
repeat = 0
for flag,(x,y) in zip(flags, deltas):
# Oh, the horrors of TrueType
# do x
if x == 0:
flag = flag | flagXsame
elif -255 <= x <= 255:
flag = flag | flagXShort
if x > 0:
flag = flag | flagXsame
else:
x = -x
xPoints.append(bytechr(x))
else:
xPoints.append(struct.pack(">h", x))
# do y
if y == 0:
flag = flag | flagYsame
elif -255 <= y <= 255:
flag = flag | flagYShort
if y > 0:
flag = flag | flagYsame
else:
y = -y
yPoints.append(bytechr(y))
else:
yPoints.append(struct.pack(">h", y))
# handle repeating flags
if flag == lastflag and repeat != 255:
repeat = repeat + 1
if repeat == 1:
compressedflags.append(flag)
else:
compressedflags[-2] = flag | flagRepeat
compressedflags[-1] = repeat
else:
repeat = 0
compressedflags.append(flag)
lastflag = flag
compressedFlags = array.array("B", compressedflags).tostring()
compressedXs = bytesjoin(xPoints)
compressedYs = bytesjoin(yPoints)
return (compressedFlags, compressedXs, compressedYs)
def compileDeltasOptimal(self, flags, deltas):
# Implements optimal, dynaic-programming, algorithm for packing coordinate
# deltas. The savings are negligible :(.
candidates = []
bestTuple = None
bestCost = 0
repeat = 0
for flag,(x,y) in zip(flags, deltas):
# Oh, the horrors of TrueType
flag, coordBytes = flagBest(x, y, flag)
bestCost += 1 + coordBytes
newCandidates = [(bestCost, bestTuple, flag, coordBytes),
(bestCost+1, bestTuple, (flag|flagRepeat), coordBytes)]
for lastCost,lastTuple,lastFlag,coordBytes in candidates:
if lastCost + coordBytes <= bestCost + 1 and (lastFlag & flagRepeat) and (lastFlag < 0xff00) and flagSupports(lastFlag, flag):
if (lastFlag & 0xFF) == (flag|flagRepeat) and lastCost == bestCost + 1:
continue
newCandidates.append((lastCost + coordBytes, lastTuple, lastFlag+256, coordBytes))
candidates = newCandidates
bestTuple = min(candidates, key=lambda t:t[0])
bestCost = bestTuple[0]
flags = []
while bestTuple:
cost, bestTuple, flag, coordBytes = bestTuple
flags.append(flag)
flags.reverse()
compressedFlags = array.array("B")
compressedXs = array.array("B")
compressedYs = array.array("B")
coords = iter(deltas)
ff = []
for flag in flags:
repeatCount, flag = flag >> 8, flag & 0xFF
compressedFlags.append(flag)
if flag & flagRepeat:
assert(repeatCount > 0)
compressedFlags.append(repeatCount)
else:
assert(repeatCount == 0)
for i in range(1 + repeatCount):
x,y = next(coords)
flagEncodeCoords(flag, x, y, compressedXs, compressedYs)
ff.append(flag)
try:
next(coords)
raise Exception("internal error")
except StopIteration:
pass
compressedFlags = compressedFlags.tostring()
compressedXs = compressedXs.tostring()
compressedYs = compressedYs.tostring()
return (compressedFlags, compressedXs, compressedYs)
def recalcBounds(self, glyfTable):
coords, endPts, flags = self.getCoordinates(glyfTable)
if len(coords) > 0:
if 0:
# This branch calculates exact glyph outline bounds
# analytically, handling cases without on-curve
# extremas, etc. However, the glyf table header
# simply says that the bounds should be min/max x/y
# "for coordinate data", so I suppose that means no
# fancy thing here, just get extremas of all coord
# points (on and off). As such, this branch is
# disabled.
# Collect on-curve points
onCurveCoords = [coords[j] for j in range(len(coords))
if flags[j] & flagOnCurve]
# Add implicit on-curve points
start = 0
for end in endPts:
last = end
for j in range(start, end + 1):
if not ((flags[j] | flags[last]) & flagOnCurve):
x = (coords[last][0] + coords[j][0]) / 2
y = (coords[last][1] + coords[j][1]) / 2
onCurveCoords.append((x,y))
last = j
start = end + 1
# Add bounds for curves without an explicit extrema
start = 0
for end in endPts:
last = end
for j in range(start, end + 1):
if not (flags[j] & flagOnCurve):
next = j + 1 if j < end else start
bbox = calcBounds([coords[last], coords[next]])
if not pointInRect(coords[j], bbox):
# Ouch!
warnings.warn("Outline has curve with implicit extrema.")
# Ouch! Find analytical curve bounds.
pthis = coords[j]
plast = coords[last]
if not (flags[last] & flagOnCurve):
plast = ((pthis[0]+plast[0])/2, (pthis[1]+plast[1])/2)
pnext = coords[next]
if not (flags[next] & flagOnCurve):
pnext = ((pthis[0]+pnext[0])/2, (pthis[1]+pnext[1])/2)
bbox = calcQuadraticBounds(plast, pthis, pnext)
onCurveCoords.append((bbox[0],bbox[1]))
onCurveCoords.append((bbox[2],bbox[3]))
last = j
start = end + 1
self.xMin, self.yMin, self.xMax, self.yMax = calcIntBounds(onCurveCoords)
else:
self.xMin, self.yMin, self.xMax, self.yMax = calcIntBounds(coords)
else:
self.xMin, self.yMin, self.xMax, self.yMax = (0, 0, 0, 0)
def isComposite(self):
"""Can be called on compact or expanded glyph."""
if hasattr(self, "data") and self.data:
return struct.unpack(">h", self.data[:2])[0] == -1
else:
return self.numberOfContours == -1
def __getitem__(self, componentIndex):
if not self.isComposite():
raise ttLib.TTLibError("can't use glyph as sequence")
return self.components[componentIndex]
def getCoordinates(self, glyfTable):
if self.numberOfContours > 0:
return self.coordinates, self.endPtsOfContours, self.flags
elif self.isComposite():
# it's a composite
allCoords = GlyphCoordinates()
allFlags = array.array("B")
allEndPts = []
for compo in self.components:
g = glyfTable[compo.glyphName]
coordinates, endPts, flags = g.getCoordinates(glyfTable)
if hasattr(compo, "firstPt"):
# move according to two reference points
x1,y1 = allCoords[compo.firstPt]
x2,y2 = coordinates[compo.secondPt]
move = x1-x2, y1-y2
else:
move = compo.x, compo.y
coordinates = GlyphCoordinates(coordinates)
if not hasattr(compo, "transform"):
coordinates.translate(move)
else:
apple_way = compo.flags & SCALED_COMPONENT_OFFSET
ms_way = compo.flags & UNSCALED_COMPONENT_OFFSET
assert not (apple_way and ms_way)
if not (apple_way or ms_way):
scale_component_offset = SCALE_COMPONENT_OFFSET_DEFAULT # see top of this file
else:
scale_component_offset = apple_way
if scale_component_offset:
# the Apple way: first move, then scale (ie. scale the component offset)
coordinates.translate(move)
coordinates.transform(compo.transform)
else:
# the MS way: first scale, then move
coordinates.transform(compo.transform)
coordinates.translate(move)
offset = len(allCoords)
allEndPts.extend(e + offset for e in endPts)
allCoords.extend(coordinates)
allFlags.extend(flags)
return allCoords, allEndPts, allFlags
else:
return GlyphCoordinates(), [], array.array("B")
def getComponentNames(self, glyfTable):
if not hasattr(self, "data"):
if self.isComposite():
return [c.glyphName for c in self.components]
else:
return []
# Extract components without expanding glyph
if not self.data or struct.unpack(">h", self.data[:2])[0] >= 0:
return [] # Not composite
data = self.data
i = 10
components = []
more = 1
while more:
flags, glyphID = struct.unpack(">HH", data[i:i+4])
i += 4
flags = int(flags)
components.append(glyfTable.getGlyphName(int(glyphID)))
if flags & ARG_1_AND_2_ARE_WORDS: i += 4
else: i += 2
if flags & WE_HAVE_A_SCALE: i += 2
elif flags & WE_HAVE_AN_X_AND_Y_SCALE: i += 4
elif flags & WE_HAVE_A_TWO_BY_TWO: i += 8
more = flags & MORE_COMPONENTS
return components
def trim(self, remove_hinting=False):
""" Remove padding and, if requested, hinting, from a glyph.
This works on both expanded and compacted glyphs, without
expanding it."""
if not hasattr(self, "data"):
if remove_hinting:
self.program = ttProgram.Program()
self.program.fromBytecode([])
# No padding to trim.
return
if not self.data:
return
numContours = struct.unpack(">h", self.data[:2])[0]
data = array.array("B", self.data)
i = 10
if numContours >= 0:
i += 2 * numContours # endPtsOfContours
nCoordinates = ((data[i-2] << 8) | data[i-1]) + 1
instructionLen = (data[i] << 8) | data[i+1]
if remove_hinting:
# Zero instruction length
data[i] = data [i+1] = 0
i += 2
if instructionLen:
# Splice it out
data = data[:i] + data[i+instructionLen:]
instructionLen = 0
else:
i += 2 + instructionLen
coordBytes = 0
j = 0
while True:
flag = data[i]
i = i + 1
repeat = 1
if flag & flagRepeat:
repeat = data[i] + 1
i = i + 1
xBytes = yBytes = 0
if flag & flagXShort:
xBytes = 1
elif not (flag & flagXsame):
xBytes = 2
if flag & flagYShort:
yBytes = 1
elif not (flag & flagYsame):
yBytes = 2
coordBytes += (xBytes + yBytes) * repeat
j += repeat
if j >= nCoordinates:
break
assert j == nCoordinates, "bad glyph flags"
i += coordBytes
# Remove padding
data = data[:i]
else:
more = 1
we_have_instructions = False
while more:
flags =(data[i] << 8) | data[i+1]
if remove_hinting:
flags &= ~WE_HAVE_INSTRUCTIONS
if flags & WE_HAVE_INSTRUCTIONS:
we_have_instructions = True
data[i+0] = flags >> 8
data[i+1] = flags & 0xFF
i += 4
flags = int(flags)
if flags & ARG_1_AND_2_ARE_WORDS: i += 4
else: i += 2
if flags & WE_HAVE_A_SCALE: i += 2
elif flags & WE_HAVE_AN_X_AND_Y_SCALE: i += 4
elif flags & WE_HAVE_A_TWO_BY_TWO: i += 8
more = flags & MORE_COMPONENTS
if we_have_instructions:
instructionLen = (data[i] << 8) | data[i+1]
i += 2 + instructionLen
# Remove padding
data = data[:i]
self.data = data.tostring()
def removeHinting(self):
self.trim (remove_hinting=True)
def draw(self, pen, glyfTable, offset=0):
if self.isComposite():
for component in self.components:
glyphName, transform = component.getComponentInfo()
pen.addComponent(glyphName, transform)
return
coordinates, endPts, flags = self.getCoordinates(glyfTable)
if offset:
coordinates = coordinates.copy()
coordinates.translate((offset, 0))
start = 0
for end in endPts:
end = end + 1
contour = coordinates[start:end]
cFlags = flags[start:end]
start = end
if 1 not in cFlags:
# There is not a single on-curve point on the curve,
# use pen.qCurveTo's special case by specifying None
# as the on-curve point.
contour.append(None)
pen.qCurveTo(*contour)
else:
# Shuffle the points so that contour the is guaranteed
# to *end* in an on-curve point, which we'll use for
# the moveTo.
firstOnCurve = cFlags.index(1) + 1
contour = contour[firstOnCurve:] + contour[:firstOnCurve]
cFlags = cFlags[firstOnCurve:] + cFlags[:firstOnCurve]
pen.moveTo(contour[-1])
while contour:
nextOnCurve = cFlags.index(1) + 1
if nextOnCurve == 1:
pen.lineTo(contour[0])
else:
pen.qCurveTo(*contour[:nextOnCurve])
contour = contour[nextOnCurve:]
cFlags = cFlags[nextOnCurve:]
pen.closePath()
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
return self.__dict__ == other.__dict__
class GlyphComponent(object):
def __init__(self):
pass
def getComponentInfo(self):
"""Return the base glyph name and a transform."""
# XXX Ignoring self.firstPt & self.lastpt for now: I need to implement
# something equivalent in fontTools.objects.glyph (I'd rather not
# convert it to an absolute offset, since it is valuable information).
# This method will now raise "AttributeError: x" on glyphs that use
# this TT feature.
if hasattr(self, "transform"):
[[xx, xy], [yx, yy]] = self.transform
trans = (xx, xy, yx, yy, self.x, self.y)
else:
trans = (1, 0, 0, 1, self.x, self.y)
return self.glyphName, trans
def decompile(self, data, glyfTable):
flags, glyphID = struct.unpack(">HH", data[:4])
self.flags = int(flags)
glyphID = int(glyphID)
self.glyphName = glyfTable.getGlyphName(int(glyphID))
#print ">>", reprflag(self.flags)
data = data[4:]
if self.flags & ARG_1_AND_2_ARE_WORDS:
if self.flags & ARGS_ARE_XY_VALUES:
self.x, self.y = struct.unpack(">hh", data[:4])
else:
x, y = struct.unpack(">HH", data[:4])
self.firstPt, self.secondPt = int(x), int(y)
data = data[4:]
else:
if self.flags & ARGS_ARE_XY_VALUES:
self.x, self.y = struct.unpack(">bb", data[:2])
else:
x, y = struct.unpack(">BB", data[:2])
self.firstPt, self.secondPt = int(x), int(y)
data = data[2:]
if self.flags & WE_HAVE_A_SCALE:
scale, = struct.unpack(">h", data[:2])
self.transform = [[fi2fl(scale,14), 0], [0, fi2fl(scale,14)]] # fixed 2.14
data = data[2:]
elif self.flags & WE_HAVE_AN_X_AND_Y_SCALE:
xscale, yscale = struct.unpack(">hh", data[:4])
self.transform = [[fi2fl(xscale,14), 0], [0, fi2fl(yscale,14)]] # fixed 2.14
data = data[4:]
elif self.flags & WE_HAVE_A_TWO_BY_TWO:
(xscale, scale01,
scale10, yscale) = struct.unpack(">hhhh", data[:8])
self.transform = [[fi2fl(xscale,14), fi2fl(scale01,14)],
[fi2fl(scale10,14), fi2fl(yscale,14)]] # fixed 2.14
data = data[8:]
more = self.flags & MORE_COMPONENTS
haveInstructions = self.flags & WE_HAVE_INSTRUCTIONS
self.flags = self.flags & (ROUND_XY_TO_GRID | USE_MY_METRICS |
SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET |
NON_OVERLAPPING)
return more, haveInstructions, data
def compile(self, more, haveInstructions, glyfTable):
data = b""
# reset all flags we will calculate ourselves
flags = self.flags & (ROUND_XY_TO_GRID | USE_MY_METRICS |
SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET |
NON_OVERLAPPING)
if more:
flags = flags | MORE_COMPONENTS
if haveInstructions:
flags = flags | WE_HAVE_INSTRUCTIONS
if hasattr(self, "firstPt"):
if (0 <= self.firstPt <= 255) and (0 <= self.secondPt <= 255):
data = data + struct.pack(">BB", self.firstPt, self.secondPt)
else:
data = data + struct.pack(">HH", self.firstPt, self.secondPt)
flags = flags | ARG_1_AND_2_ARE_WORDS
else:
flags = flags | ARGS_ARE_XY_VALUES
if (-128 <= self.x <= 127) and (-128 <= self.y <= 127):
data = data + struct.pack(">bb", self.x, self.y)
else:
data = data + struct.pack(">hh", self.x, self.y)
flags = flags | ARG_1_AND_2_ARE_WORDS
if hasattr(self, "transform"):
transform = [[fl2fi(x,14) for x in row] for row in self.transform]
if transform[0][1] or transform[1][0]:
flags = flags | WE_HAVE_A_TWO_BY_TWO
data = data + struct.pack(">hhhh",
transform[0][0], transform[0][1],
transform[1][0], transform[1][1])
elif transform[0][0] != transform[1][1]:
flags = flags | WE_HAVE_AN_X_AND_Y_SCALE
data = data + struct.pack(">hh",
transform[0][0], transform[1][1])
else:
flags = flags | WE_HAVE_A_SCALE
data = data + struct.pack(">h",
transform[0][0])
glyphID = glyfTable.getGlyphID(self.glyphName)
return struct.pack(">HH", flags, glyphID) + data
def toXML(self, writer, ttFont):
attrs = [("glyphName", self.glyphName)]
if not hasattr(self, "firstPt"):
attrs = attrs + [("x", self.x), ("y", self.y)]
else:
attrs = attrs + [("firstPt", self.firstPt), ("secondPt", self.secondPt)]
if hasattr(self, "transform"):
transform = self.transform
if transform[0][1] or transform[1][0]:
attrs = attrs + [
("scalex", transform[0][0]), ("scale01", transform[0][1]),
("scale10", transform[1][0]), ("scaley", transform[1][1]),
]
elif transform[0][0] != transform[1][1]:
attrs = attrs + [
("scalex", transform[0][0]), ("scaley", transform[1][1]),
]
else:
attrs = attrs + [("scale", transform[0][0])]
attrs = attrs + [("flags", hex(self.flags))]
writer.simpletag("component", attrs)
writer.newline()
def fromXML(self, name, attrs, content, ttFont):
self.glyphName = attrs["glyphName"]
if "firstPt" in attrs:
self.firstPt = safeEval(attrs["firstPt"])
self.secondPt = safeEval(attrs["secondPt"])
else:
self.x = safeEval(attrs["x"])
self.y = safeEval(attrs["y"])
if "scale01" in attrs:
scalex = safeEval(attrs["scalex"])
scale01 = safeEval(attrs["scale01"])
scale10 = safeEval(attrs["scale10"])
scaley = safeEval(attrs["scaley"])
self.transform = [[scalex, scale01], [scale10, scaley]]
elif "scalex" in attrs:
scalex = safeEval(attrs["scalex"])
scaley = safeEval(attrs["scaley"])
self.transform = [[scalex, 0], [0, scaley]]
elif "scale" in attrs:
scale = safeEval(attrs["scale"])
self.transform = [[scale, 0], [0, scale]]
self.flags = safeEval(attrs["flags"])
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
return self.__dict__ == other.__dict__
class GlyphCoordinates(object):
def __init__(self, iterable=[]):
self._a = array.array("h")
self.extend(iterable)
def isFloat(self):
return self._a.typecode == 'f'
def _ensureFloat(self):
if self.isFloat():
return
# The conversion to list() is to work around Jython bug
self._a = array.array("f", list(self._a))
def _checkFloat(self, p):
if any(isinstance(v, float) for v in p):
p = [int(v) if int(v) == v else v for v in p]
if any(isinstance(v, float) for v in p):
self._ensureFloat()
return p
@staticmethod
def zeros(count):
return GlyphCoordinates([(0,0)] * count)
def copy(self):
c = GlyphCoordinates()
c._a.extend(self._a)
return c
def __len__(self):
return len(self._a) // 2
def __getitem__(self, k):
if isinstance(k, slice):
indices = range(*k.indices(len(self)))
return [self[i] for i in indices]
return self._a[2*k],self._a[2*k+1]
def __setitem__(self, k, v):
if isinstance(k, slice):
indices = range(*k.indices(len(self)))
# XXX This only works if len(v) == len(indices)
# TODO Implement __delitem__
for j,i in enumerate(indices):
self[i] = v[j]
return
v = self._checkFloat(v)
self._a[2*k],self._a[2*k+1] = v
def __repr__(self):
return 'GlyphCoordinates(['+','.join(str(c) for c in self)+'])'
def append(self, p):
p = self._checkFloat(p)
self._a.extend(tuple(p))
def extend(self, iterable):
for p in iterable:
p = self._checkFloat(p)
self._a.extend(p)
def relativeToAbsolute(self):
a = self._a
x,y = 0,0
for i in range(len(a) // 2):
a[2*i ] = x = a[2*i ] + x
a[2*i+1] = y = a[2*i+1] + y
def absoluteToRelative(self):
a = self._a
x,y = 0,0
for i in range(len(a) // 2):
dx = a[2*i ] - x
dy = a[2*i+1] - y
x = a[2*i ]
y = a[2*i+1]
a[2*i ] = dx
a[2*i+1] = dy
def translate(self, p):
(x,y) = p
a = self._a
for i in range(len(a) // 2):
a[2*i ] += x
a[2*i+1] += y
def transform(self, t):
a = self._a
for i in range(len(a) // 2):
x = a[2*i ]
y = a[2*i+1]
px = x * t[0][0] + y * t[1][0]
py = x * t[0][1] + y * t[1][1]
self[i] = (px, py)
def __ne__(self, other):
return not self.__eq__(other)
def __eq__(self, other):
if type(self) != type(other):
return NotImplemented
return self._a == other._a
def reprflag(flag):
bin = ""
if isinstance(flag, str):
flag = byteord(flag)
while flag:
if flag & 0x01:
bin = "1" + bin
else:
bin = "0" + bin
flag = flag >> 1
bin = (14 - len(bin)) * "0" + bin
return bin
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