1 from __future__ import print_function, division, absolute_import 2 from fontTools.misc.py23 import * 3 from fontTools.misc import sstruct 4 from fontTools.misc.textTools import safeEval 5 from . import DefaultTable 6 7 vheaFormat = """ 8 > # big endian 9 tableVersion: 16.16F 10 ascent: h 11 descent: h 12 lineGap: h 13 advanceHeightMax: H 14 minTopSideBearing: h 15 minBottomSideBearing: h 16 yMaxExtent: h 17 caretSlopeRise: h 18 caretSlopeRun: h 19 reserved0: h 20 reserved1: h 21 reserved2: h 22 reserved3: h 23 reserved4: h 24 metricDataFormat: h 25 numberOfVMetrics: H 26 """ 27 28 class table__v_h_e_a(DefaultTable.DefaultTable): 29 30 dependencies = ['vmtx', 'glyf'] 31 32 def decompile(self, data, ttFont): 33 sstruct.unpack(vheaFormat, data, self) 34 35 def compile(self, ttFont): 36 self.recalc(ttFont) 37 return sstruct.pack(vheaFormat, self) 38 39 def recalc(self, ttFont): 40 vtmxTable = ttFont['vmtx'] 41 if 'glyf' in ttFont: 42 if not ttFont.isLoaded('glyf'): 43 return 44 glyfTable = ttFont['glyf'] 45 advanceHeightMax = -100000 # arbitrary big negative number 46 minTopSideBearing = 100000 # arbitrary big number 47 minBottomSideBearing = 100000 # arbitrary big number 48 yMaxExtent = -100000 # arbitrary big negative number 49 50 for name in ttFont.getGlyphOrder(): 51 height, tsb = vtmxTable[name] 52 g = glyfTable[name] 53 if g.numberOfContours <= 0: 54 continue 55 advanceHeightMax = max(advanceHeightMax, height) 56 minTopSideBearing = min(minTopSideBearing, tsb) 57 rsb = height - tsb - (g.yMax - g.yMin) 58 minBottomSideBearing = min(minBottomSideBearing, rsb) 59 extent = tsb + (g.yMax - g.yMin) 60 yMaxExtent = max(yMaxExtent, extent) 61 self.advanceHeightMax = advanceHeightMax 62 self.minTopSideBearing = minTopSideBearing 63 self.minBottomSideBearing = minBottomSideBearing 64 self.yMaxExtent = yMaxExtent 65 else: 66 # XXX CFF recalc... 67 pass 68 69 def toXML(self, writer, ttFont): 70 formatstring, names, fixes = sstruct.getformat(vheaFormat) 71 for name in names: 72 value = getattr(self, name) 73 writer.simpletag(name, value=value) 74 writer.newline() 75 76 def fromXML(self, name, attrs, content, ttFont): 77 setattr(self, name, safeEval(attrs["value"])) 78 79
