303 lines
9.4 KiB
Python
303 lines
9.4 KiB
Python
from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools import ttLib
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from fontTools.misc import sstruct
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from fontTools.misc.fixedTools import fixedToFloat
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from fontTools.misc.textTools import safeEval
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from fontTools.ttLib.tables._g_l_y_f import GlyphCoordinates
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from . import DefaultTable
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import array
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import sys
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import struct
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# Apple's documentation of 'gvar':
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# https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6gvar.html
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#
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# FreeType2 source code for parsing 'gvar':
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# http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/src/truetype/ttgxvar.c
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GVAR_HEADER_FORMAT = b"""
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> # big endian
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version: H
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reserved: H
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axisCount: H
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sharedCoordCount: H
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offsetToCoord: I
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glyphCount: H
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flags: H
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offsetToData: I
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"""
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GVAR_HEADER_SIZE = sstruct.calcsize(GVAR_HEADER_FORMAT)
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TUPLES_SHARE_POINT_NUMBERS = 0x8000
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TUPLE_COUNT_MASK = 0x0fff
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EMBEDDED_TUPLE_COORD = 0x8000
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INTERMEDIATE_TUPLE = 0x4000
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PRIVATE_POINT_NUMBERS = 0x2000
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TUPLE_INDEX_MASK = 0x0fff
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DELTAS_ARE_ZERO = 0x80
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DELTAS_ARE_WORDS = 0x40
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DELTA_RUN_COUNT_MASK = 0x3f
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POINTS_ARE_WORDS = 0x80
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POINT_RUN_COUNT_MASK = 0x7f
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class table__g_v_a_r(DefaultTable.DefaultTable):
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dependencies = ["fvar", "glyf"]
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def decompile(self, data, ttFont):
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axisTags = [axis.AxisTag for axis in ttFont["fvar"].table.VariationAxis]
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glyphs = ttFont.getGlyphOrder()
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sstruct.unpack(GVAR_HEADER_FORMAT, data[0:GVAR_HEADER_SIZE], self)
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assert len(glyphs) == self.glyphCount
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assert len(axisTags) == self.axisCount
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offsets = self.decompileOffsets_(data[GVAR_HEADER_SIZE:],
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format=(self.flags & 1), glyphCount=self.glyphCount)
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sharedCoords = self.decompileSharedCoords_(axisTags, data)
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self.variations = {}
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for i in xrange(self.glyphCount):
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glyphName = glyphs[i]
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glyph = ttFont["glyf"][glyphName]
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if glyph.isComposite():
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numPoints = len(glyph.components) + 4
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else:
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# Empty glyphs (eg. space, nonmarkingreturn) have no "coordinates" attribute.
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numPoints = len(getattr(glyph, "coordinates", [])) + 4
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gvarData = data[self.offsetToData + offsets[i] : self.offsetToData + offsets[i + 1]]
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self.variations[glyphName] = self.decompileTuples_(numPoints, sharedCoords, axisTags, gvarData)
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def decompileSharedCoords_(self, axisTags, data):
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result = []
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pos = self.offsetToCoord
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for i in xrange(self.sharedCoordCount):
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coord, pos = self.decompileCoord_(axisTags, data, pos)
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result.append(coord)
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return result
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@staticmethod
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def decompileCoord_(axisTags, data, offset):
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coord = {}
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pos = offset
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for axis in axisTags:
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coord[axis] = fixedToFloat(struct.unpack(b">h", data[pos:pos+2])[0], 14)
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pos += 2
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return coord, pos
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@staticmethod
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def decompileOffsets_(data, format, glyphCount):
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if format == 0:
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# Short format: array of UInt16
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offsets = array.array("H")
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offsetsSize = (glyphCount + 1) * 2
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else:
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# Long format: array of UInt32
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offsets = array.array("I")
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offsetsSize = (glyphCount + 1) * 4
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offsets.fromstring(data[0 : offsetsSize])
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if sys.byteorder != "big":
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offsets.byteswap()
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# In the short format, offsets need to be multiplied by 2.
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# This is not documented in Apple's TrueType specification,
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# but can be inferred from the FreeType implementation, and
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# we could verify it with two sample GX fonts.
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if format == 0:
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offsets = [off * 2 for off in offsets]
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return offsets
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@staticmethod
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def compileOffsets_(offsets):
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"""Packs a list of offsets into a 'gvar' offset table.
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Returns a pair (bytestring, format). Bytestring is the
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packed offset table. Format indicates whether the table
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uses short (format=0) or long (format=1) integers.
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The returned format should get packed into the flags field
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of the 'gvar' header.
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"""
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assert len(offsets) >= 2
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for i in xrange(1, len(offsets)):
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assert offsets[i - 1] <= offsets[i]
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if max(offsets) <= 0xffff * 2:
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packed = array.array(b"H", [n >> 1 for n in offsets])
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format = 0
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else:
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packed = array.array(b"I", offsets)
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format = 1
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if sys.byteorder != "big":
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packed.byteswap()
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return (packed.tostring(), format)
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def decompileTuples_(self, numPoints, sharedCoords, axisTags, data):
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if len(data) < 4:
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return []
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tuples = []
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flags, offsetToData = struct.unpack(b">HH", data[:4])
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pos = 4
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dataPos = offsetToData
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if (flags & TUPLES_SHARE_POINT_NUMBERS) != 0:
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sharedPoints, dataPos = self.decompilePoints_(numPoints, data, dataPos)
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else:
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sharedPoints = []
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for i in xrange(flags & TUPLE_COUNT_MASK):
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dataSize, flags = struct.unpack(b">HH", data[pos:pos+4])
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tupleSize = self.getTupleSize_(flags, self.axisCount)
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tuple = data[pos : pos + tupleSize]
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tupleData = data[dataPos : dataPos + dataSize]
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tuples.append(self.decompileTuple_(numPoints, sharedCoords, sharedPoints, axisTags, tuple, tupleData))
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pos += tupleSize
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dataPos += dataSize
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return tuples
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@staticmethod
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def getTupleSize_(flags, axisCount):
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size = 4
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if (flags & EMBEDDED_TUPLE_COORD) != 0:
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size += axisCount * 2
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if (flags & INTERMEDIATE_TUPLE) != 0:
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size += axisCount * 4
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return size
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@staticmethod
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def decompileTuple_(numPoints, sharedCoords, sharedPoints, axisTags, data, tupleData):
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flags = struct.unpack(b">H", data[2:4])[0]
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pos = 4
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coordSize = len(axisTags) * 2
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if (flags & EMBEDDED_TUPLE_COORD) == 0:
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coord = sharedCoords[flags & TUPLE_INDEX_MASK]
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else:
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coord, pos = table__g_v_a_r.decompileCoord_(axisTags, data, pos)
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minCoord = maxCoord = coord
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if (flags & INTERMEDIATE_TUPLE) != 0:
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minCoord, pos = table__g_v_a_r.decompileCoord_(axisTags, data, pos)
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maxCoord, pos = table__g_v_a_r.decompileCoord_(axisTags, data, pos)
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axes = {}
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for axis in axisTags:
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coords = minCoord[axis], coord[axis], maxCoord[axis]
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if coords != (0.0, 0.0, 0.0):
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axes[axis] = coords
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pos = 0
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if (flags & PRIVATE_POINT_NUMBERS) != 0:
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points, pos = table__g_v_a_r.decompilePoints_(numPoints, tupleData, pos)
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else:
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points = sharedPoints
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deltas_x, pos = table__g_v_a_r.decompileDeltas_(len(points), tupleData, pos)
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deltas_y, pos = table__g_v_a_r.decompileDeltas_(len(points), tupleData, pos)
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deltas = GlyphCoordinates.zeros(numPoints)
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for p, x, y in zip(points, deltas_x, deltas_y):
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deltas[p] = (x, y)
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return GlyphVariation(axes, deltas)
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@staticmethod
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def decompilePoints_(numPoints, data, offset):
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"""(numPoints, data, offset) --> ([point1, point2, ...], newOffset)"""
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pos = offset
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numPointsInData = ord(data[pos])
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pos += 1
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if (numPointsInData & POINTS_ARE_WORDS) != 0:
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numPointsInData = (numPointsInData & POINT_RUN_COUNT_MASK) << 8 | ord(data[pos])
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pos += 1
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if numPointsInData == 0:
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return (range(numPoints), pos)
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result = []
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while len(result) < numPointsInData:
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runHeader = ord(data[pos])
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pos += 1
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numPointsInRun = (runHeader & POINT_RUN_COUNT_MASK) + 1
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point = 0
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if (runHeader & POINTS_ARE_WORDS) == 0:
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for i in xrange(numPointsInRun):
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point += ord(data[pos])
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pos += 1
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result.append(point)
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else:
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for i in xrange(numPointsInRun):
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point += struct.unpack(">H", data[pos:pos+2])[0]
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pos += 2
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result.append(point)
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if max(result) >= numPoints:
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raise ttLib.TTLibError("malformed 'gvar' table")
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return (result, pos)
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@staticmethod
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def decompileDeltas_(numDeltas, data, offset):
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"""(numDeltas, data, offset) --> ([delta, delta, ...], newOffset)"""
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result = []
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pos = offset
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while len(result) < numDeltas:
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runHeader = ord(data[pos])
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pos += 1
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numDeltasInRun = (runHeader & DELTA_RUN_COUNT_MASK) + 1
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if (runHeader & DELTAS_ARE_ZERO) != 0:
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result.extend([0] * numDeltasInRun)
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elif (runHeader & DELTAS_ARE_WORDS) != 0:
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for i in xrange(numDeltasInRun):
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result.append(struct.unpack(">h", data[pos:pos+2])[0])
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pos += 2
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else:
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for i in xrange(numDeltasInRun):
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result.append(struct.unpack(">b", data[pos])[0])
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pos += 1
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assert len(result) == numDeltas
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return (result, pos)
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def toXML(self, writer, ttFont):
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writer.simpletag("version", value=self.version)
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writer.newline()
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writer.simpletag("reserved", value=self.reserved)
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writer.newline()
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axisTags = [axis.AxisTag for axis in ttFont["fvar"].table.VariationAxis]
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for glyphName in ttFont.getGlyphOrder():
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tuples = self.variations.get(glyphName)
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if not tuples:
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continue
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writer.begintag("glyphVariations", glyph=glyphName)
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writer.newline()
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for tuple in tuples:
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tuple.toXML(writer, axisTags)
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writer.endtag("glyphVariations")
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writer.newline()
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class GlyphVariation:
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def __init__(self, axes, coordinates):
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self.axes = axes
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self.coordinates = coordinates
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def __repr__(self):
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axes = ",".join(sorted(["%s=%s" % (name, value) for (name, value) in self.axes.items()]))
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return "<GlyphVariation %s %s>" % (axes, self.coordinates)
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def toXML(self, writer, axisTags):
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writer.begintag("tuple")
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writer.newline()
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for axis in axisTags:
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value = self.axes.get(axis)
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if value != None:
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minValue, value, maxValue = value
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if minValue == value and maxValue == value:
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writer.simpletag("coord", axis=axis, value=value)
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else:
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writer.simpletag("coord", axis=axis, value=value,
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min=minValue, max=maxValue)
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writer.newline()
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wrote_any_points = False
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for i in xrange(len(self.coordinates)):
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x, y = self.coordinates[i]
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if x != 0 or y != 0:
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writer.simpletag("delta", pt=i, x=x, y=y)
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writer.newline()
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wrote_any_points = True
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if not wrote_any_points:
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writer.comment("all deltas are (0,0)")
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writer.newline()
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writer.endtag("tuple")
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writer.newline()
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