1# Copyright 2013 Google, Inc. All Rights Reserved. 2# 3# Google Author(s): Behdad Esfahbod, Roozbeh Pournader 4 5from fontTools.merge.unicode import is_Default_Ignorable 6from fontTools.pens.recordingPen import DecomposingRecordingPen 7import logging 8 9 10log = logging.getLogger("fontTools.merge") 11 12 13def computeMegaGlyphOrder(merger, glyphOrders): 14 """Modifies passed-in glyphOrders to reflect new glyph names. 15 Stores merger.glyphOrder.""" 16 megaOrder = {} 17 for glyphOrder in glyphOrders: 18 for i,glyphName in enumerate(glyphOrder): 19 if glyphName in megaOrder: 20 n = megaOrder[glyphName] 21 while (glyphName + "#" + repr(n)) in megaOrder: 22 n += 1 23 megaOrder[glyphName] = n 24 glyphName += "#" + repr(n) 25 glyphOrder[i] = glyphName 26 megaOrder[glyphName] = 1 27 merger.glyphOrder = megaOrder = list(megaOrder.keys()) 28 29 30def _glyphsAreSame(glyphSet1, glyphSet2, glyph1, glyph2, 31 advanceTolerance=.05, 32 advanceToleranceEmpty=.20): 33 pen1 = DecomposingRecordingPen(glyphSet1) 34 pen2 = DecomposingRecordingPen(glyphSet2) 35 g1 = glyphSet1[glyph1] 36 g2 = glyphSet2[glyph2] 37 g1.draw(pen1) 38 g2.draw(pen2) 39 if pen1.value != pen2.value: 40 return False 41 # Allow more width tolerance for glyphs with no ink 42 tolerance = advanceTolerance if pen1.value else advanceToleranceEmpty 43 # TODO Warn if advances not the same but within tolerance. 44 if abs(g1.width - g2.width) > g1.width * tolerance: 45 return False 46 if hasattr(g1, 'height') and g1.height is not None: 47 if abs(g1.height - g2.height) > g1.height * tolerance: 48 return False 49 return True 50 51# Valid (format, platformID, platEncID) triplets for cmap subtables containing 52# Unicode BMP-only and Unicode Full Repertoire semantics. 53# Cf. OpenType spec for "Platform specific encodings": 54# https://docs.microsoft.com/en-us/typography/opentype/spec/name 55class _CmapUnicodePlatEncodings: 56 BMP = {(4, 3, 1), (4, 0, 3), (4, 0, 4), (4, 0, 6)} 57 FullRepertoire = {(12, 3, 10), (12, 0, 4), (12, 0, 6)} 58 59def computeMegaCmap(merger, cmapTables): 60 """Sets merger.cmap and merger.glyphOrder.""" 61 62 # TODO Handle format=14. 63 # Only merge format 4 and 12 Unicode subtables, ignores all other subtables 64 # If there is a format 12 table for a font, ignore the format 4 table of it 65 chosenCmapTables = [] 66 for fontIdx,table in enumerate(cmapTables): 67 format4 = None 68 format12 = None 69 for subtable in table.tables: 70 properties = (subtable.format, subtable.platformID, subtable.platEncID) 71 if properties in _CmapUnicodePlatEncodings.BMP: 72 format4 = subtable 73 elif properties in _CmapUnicodePlatEncodings.FullRepertoire: 74 format12 = subtable 75 else: 76 log.warning( 77 "Dropped cmap subtable from font '%s':\t" 78 "format %2s, platformID %2s, platEncID %2s", 79 fontIdx, subtable.format, subtable.platformID, subtable.platEncID 80 ) 81 if format12 is not None: 82 chosenCmapTables.append((format12, fontIdx)) 83 elif format4 is not None: 84 chosenCmapTables.append((format4, fontIdx)) 85 86 # Build the unicode mapping 87 merger.cmap = cmap = {} 88 fontIndexForGlyph = {} 89 glyphSets = [None for f in merger.fonts] if hasattr(merger, 'fonts') else None 90 91 for table,fontIdx in chosenCmapTables: 92 # handle duplicates 93 for uni,gid in table.cmap.items(): 94 oldgid = cmap.get(uni, None) 95 if oldgid is None: 96 cmap[uni] = gid 97 fontIndexForGlyph[gid] = fontIdx 98 elif is_Default_Ignorable(uni) or uni in (0x25CC,): # U+25CC DOTTED CIRCLE 99 continue 100 elif oldgid != gid: 101 # Char previously mapped to oldgid, now to gid. 102 # Record, to fix up in GSUB 'locl' later. 103 if merger.duplicateGlyphsPerFont[fontIdx].get(oldgid) is None: 104 if glyphSets is not None: 105 oldFontIdx = fontIndexForGlyph[oldgid] 106 for idx in (fontIdx, oldFontIdx): 107 if glyphSets[idx] is None: 108 glyphSets[idx] = merger.fonts[idx].getGlyphSet() 109 #if _glyphsAreSame(glyphSets[oldFontIdx], glyphSets[fontIdx], oldgid, gid): 110 # continue 111 merger.duplicateGlyphsPerFont[fontIdx][oldgid] = gid 112 elif merger.duplicateGlyphsPerFont[fontIdx][oldgid] != gid: 113 # Char previously mapped to oldgid but oldgid is already remapped to a different 114 # gid, because of another Unicode character. 115 # TODO: Try harder to do something about these. 116 log.warning("Dropped mapping from codepoint %#06X to glyphId '%s'", uni, gid) 117 118 119def renameCFFCharStrings(merger, glyphOrder, cffTable): 120 """Rename topDictIndex charStrings based on glyphOrder.""" 121 td = cffTable.cff.topDictIndex[0] 122 123 charStrings = {} 124 for i, v in enumerate(td.CharStrings.charStrings.values()): 125 glyphName = glyphOrder[i] 126 charStrings[glyphName] = v 127 td.CharStrings.charStrings = charStrings 128 129 td.charset = list(glyphOrder) 130