TrueType Font cmap table Format 0 not serializing
Here is the data I am using to construct the table:
{ version: { type: 'USHORT', value: 0 },
numTables: { type: 'USHORT', value: 1 },
platformID: { type: 'USHORT', value: 0 },
encodingID: { type: 'USHORT', value: 0 },
offset: { type: 'ULONG', value: 12 },
format: { type: 'USHORT', value: 0 },
length: { type: 'USHORT', value: 262 },
language: { type: 'USHORT', value: 0 },
glyphIdArray_0: { type: 'BYTE', value: 97 },
glyphIdArray_1: { type: 'BYTE', value: 98 },
glyphIdArray_2: { type: 'BYTE', value: 100 },
glyphIdArray_3: { type: 'BYTE', value: 0 },
glyphIdArray_4: { type: 'BYTE', value: 0 },
...
glyphIdArray_253: { type: 'BYTE', value: 0 },
glyphIdArray_254: { type: 'BYTE', value: 0 },
glyphIdArray_255: { type: 'BYTE', value: 0 } }
I have played with all of these variables:
- number of
glyphIdArrayitems, from the 3 characters at the beginning, to 262 as specified in the docs. - platformID and encodingID, tried 3/4, 1/0, 1/4, 3/1
- length: tried 3, 256, 262
- offset: tried 0, 12, 18
The format is 0 in this example, trying to just have a basic font.
Wondering what the correct format is for format: 0 TrueType font cmap table, or why this isn't working.
The two specs I'm looking at are Microsoft's and Apple's.
Not sure if this has anything to do with it, can't really interpret this.
Not sure why the cmap docs say 262 length while the post docs say 258.
Also I tried this:
$ ttfdump Regular.otf
True Type Font File Dumper: v 0.5.5
Copyright 1996-1998 ollie@ms1.hinet.net
Dumping File:Regular.otf
Offset Table
------------
sfnt version: 'true'
number of tables: 10
0. 'OS/2' - checksum = 0x00000000, offset = 0x000000ac, len = 100
1. 'cmap' - checksum = 0x00000000, offset = 0x00000110, len = 274
2. 'glyf' - checksum = 0x00000000, offset = 0x00000224, len = 87
3. 'head' - checksum = 0x00000000, offset = 0x0000027c, len = 54
4. 'hhea' - checksum = 0x00000000, offset = 0x000002b4, len = 36
5. 'hmtx' - checksum = 0x00000000, offset = 0x000002d8, len = 12
6. 'loca' - checksum = 0x00000000, offset = 0x000002e4, len = 16
7. 'maxp' - checksum = 0x00000000, offset = 0x000002f4, len = 32
8. 'name' - checksum = 0x00000000, offset = 0x00000314, len = 173
9. 'post' - checksum = 0x00000000, offset = 0x000003c4, len = 32
'cmap' Table - Character to Glyph Index Mapping Table
-----------------------------------------------------
'cmap' version: 0
number of encodings: 1
number of subtables: 1
Encoding 0. PlatformID: 0
EcodingID: 4
SubTable: 0, Offset: 0x0000000c
SubTable 0. Format 0 - Byte encoding table
Length: 256
Version: 0
Char 0 -> Index 0
Char 1 -> Index 0
Char 2 -> Index 0
Char 3 -> Index 98
Char 4 -> Index 98
Char 5 -> Index 98
Char 6 -> Index 98
Char 7 -> Index 98
Char 8 -> Index 98
Char 9 -> Index 98
Char 10 -> Index 98
Char 11 -> Index 98
Char 12 -> Index 98
Char 13 -> Index 98
Char 14 -> Index 98
Char 15 -> Index 98
Char 16 -> Index 98
Char 17 -> Index 98
Char 18 -> Index 98
Char 19 -> Index 98
Char 20 -> Index 98
Char 21 -> Index 98
Char 22 -> Index 98
Char 23 -> Index 98
Char 24 -> Index 98
Char 25 -> Index 98
Char 26 -> Index 98
Char 27 -> Index 98
Char 28 -> Index 98
Char 29 -> Index 98
Char 30 -> Index 98
Char 31 -> Index 98
Char 32 -> Index 98
Char 33 -> Index 98
Char 34 -> Index 98
Char 35 -> Index 98
Char 36 -> Index 98
Char 37 -> Index 98
Char 38 -> Index 98
Char 39 -> Index 98
Char 40 -> Index 98
Char 41 -> Index 98
Char 42 -> Index 98
Char 43 -> Index 98
Char 44 -> Index 98
Char 45 -> Index 98
Char 46 -> Index 98
Char 47 -> Index 98
Char 48 -> Index 98
Char 49 -> Index 98
Char 50 -> Index 98
Char 51 -> Index 98
Char 52 -> Index 98
Char 53 -> Index 98
Char 54 -> Index 98
Char 55 -> Index 98
Char 56 -> Index 98
Char 57 -> Index 98
Char 58 -> Index 98
Char 59 -> Index 98
Char 60 -> Index 98
Char 61 -> Index 98
Char 62 -> Index 98
Char 63 -> Index 98
Char 64 -> Index 98
Char 65 -> Index 98
Char 66 -> Index 98
Char 67 -> Index 98
Char 68 -> Index 98
Char 69 -> Index 98
Char 70 -> Index 98
Char 71 -> Index 98
Char 72 -> Index 98
Char 73 -> Index 98
Char 74 -> Index 98
Char 75 -> Index 98
Char 76 -> Index 98
Char 77 -> Index 98
Char 78 -> Index 98
Char 79 -> Index 98
Char 80 -> Index 98
Char 81 -> Index 98
Char 82 -> Index 98
Char 83 -> Index 98
Char 84 -> Index 98
Char 85 -> Index 98
Char 86 -> Index 98
Char 87 -> Index 98
Char 88 -> Index 98
Char 89 -> Index 98
Char 90 -> Index 98
Char 91 -> Index 98
Char 92 -> Index 98
Char 93 -> Index 98
Char 94 -> Index 98
Char 95 -> Index 98
Char 96 -> Index 98
Char 97 -> Index 98
Char 98 -> Index 98
Char 99 -> Index 98
Char 100 -> Index 98
Char 101 -> Index 98
Char 102 -> Index 98
Char 103 -> Index 98
Char 104 -> Index 98
Char 105 -> Index 98
Char 106 -> Index 98
Char 107 -> Index 98
Char 108 -> Index 98
Char 109 -> Index 98
Char 110 -> Index 98
Char 111 -> Index 98
Char 112 -> Index 98
Char 113 -> Index 98
Char 114 -> Index 98
Char 115 -> Index 98
Char 116 -> Index 98
Char 117 -> Index 98
Char 118 -> Index 98
Char 119 -> Index 98
Char 120 -> Index 98
Char 121 -> Index 98
Char 122 -> Index 98
Char 123 -> Index 98
Char 124 -> Index 98
Char 125 -> Index 98
Char 126 -> Index 98
Char 127 -> Index 98
Char 128 -> Index 98
Char 129 -> Index 98
Char 130 -> Index 98
Char 131 -> Index 98
Char 132 -> Index 98
Char 133 -> Index 98
Char 134 -> Index 98
Char 135 -> Index 98
Char 136 -> Index 98
Char 137 -> Index 98
Char 138 -> Index 98
Char 139 -> Index 98
Char 140 -> Index 98
Char 141 -> Index 98
Char 142 -> Index 98
Char 143 -> Index 98
Char 144 -> Index 98
Char 145 -> Index 98
Char 146 -> Index 98
Char 147 -> Index 98
Char 148 -> Index 98
Char 149 -> Index 98
Char 150 -> Index 98
Char 151 -> Index 98
Char 152 -> Index 98
Char 153 -> Index 98
Char 154 -> Index 98
Char 155 -> Index 98
Char 156 -> Index 98
Char 157 -> Index 98
Char 158 -> Index 98
Char 159 -> Index 98
Char 160 -> Index 98
Char 161 -> Index 98
Char 162 -> Index 98
Char 163 -> Index 98
Char 164 -> Index 98
Char 165 -> Index 98
Char 166 -> Index 98
Char 167 -> Index 98
Char 168 -> Index 98
Char 169 -> Index 98
Char 170 -> Index 98
Char 171 -> Index 98
Char 172 -> Index 98
Char 173 -> Index 98
Char 174 -> Index 98
Char 175 -> Index 98
Char 176 -> Index 98
Char 177 -> Index 98
Char 178 -> Index 98
Char 179 -> Index 98
Char 180 -> Index 98
Char 181 -> Index 98
Char 182 -> Index 98
Char 183 -> Index 98
Char 184 -> Index 98
Char 185 -> Index 98
Char 186 -> Index 98
Char 187 -> Index 98
Char 188 -> Index 98
Char 189 -> Index 98
Char 190 -> Index 98
Char 191 -> Index 98
Char 192 -> Index 98
Char 193 -> Index 98
Char 194 -> Index 98
Char 195 -> Index 98
Char 196 -> Index 98
Char 197 -> Index 98
Char 198 -> Index 98
Char 199 -> Index 98
Char 200 -> Index 98
Char 201 -> Index 98
Char 202 -> Index 98
Char 203 -> Index 98
Char 204 -> Index 98
Char 205 -> Index 98
Char 206 -> Index 98
Char 207 -> Index 98
Char 208 -> Index 98
Char 209 -> Index 98
Char 210 -> Index 98
Char 211 -> Index 98
Char 212 -> Index 98
Char 213 -> Index 98
Char 214 -> Index 98
Char 215 -> Index 98
Char 216 -> Index 98
Char 217 -> Index 98
Char 218 -> Index 98
Char 219 -> Index 98
Char 220 -> Index 98
Char 221 -> Index 98
Char 222 -> Index 98
Char 223 -> Index 98
Char 224 -> Index 98
Char 225 -> Index 98
Char 226 -> Index 98
Char 227 -> Index 98
Char 228 -> Index 98
Char 229 -> Index 98
Char 230 -> Index 98
Char 231 -> Index 98
Char 232 -> Index 98
Char 233 -> Index 98
Char 234 -> Index 98
Char 235 -> Index 98
Char 236 -> Index 98
Char 237 -> Index 98
Char 238 -> Index 98
Char 239 -> Index 98
Char 240 -> Index 98
Char 241 -> Index 98
Char 242 -> Index 98
Char 243 -> Index 98
Char 244 -> Index 98
Char 245 -> Index 98
Char 246 -> Index 98
Char 247 -> Index 98
Char 248 -> Index 98
Char 249 -> Index 98
Char 250 -> Index 98
Char 251 -> Index 98
Char 252 -> Index 98
Char 253 -> Index 98
Char 254 -> Index 98
Char 255 -> Index 98
'head' Table - Font Header
--------------------------
'head' version: 1.0
fontReversion: 1.4352
checkSumAdjustment: 0x00000000
magicNumber: 0x5f0f3cf5
flags: 0x0003
unitsPerEm: 2048
created: 0x00000000d86cebf5
modified: 0x00000000d86cebf5
xMin: 10
yMin: 10
xMax: 90
yMax: 90
macStyle bits: 0x0000
lowestRecPPEM: 3
fontDirectionHint: 2
indexToLocFormat: 1
glyphDataFormat: 0
'hhea' Table - Horizontal Header
--------------------------
'hhea' version: 1.0
yAscender: 200
yDescender: 100
yLineGap: 0
advanceWidthMax: 90
minLeftSideBearing: 0
minRightSideBearing: 10
xMaxExtent: 80
caretSlopeRise: 1
caretSlopeRun: 0
reserved0: 0
reserved1: 0
reserved2: 0
reserved3: 0
reserved4: 0
metricDataFormat: 0
numberOfHMetrics: 3
'hmtx' Table - Horizontal Metrics
---------------------------------
0. advWid: 90, LSBear: 10
1. advWid: 90, LSBear: 10
2. advWid: 90, LSBear: 10
'loca' Table - Index to Location
--------------------------------
Idx 0 -> GlyphOffset 0x00000000
Idx 1 -> GlyphOffset 0x0000001d
Idx 2 -> GlyphOffset 0x0000003a
Ended at 0x00000057
'maxp' Table - Maximum Profile
------------------------------
'maxp' version: 1.0
numGlyphs: 3
maxPoints: 5
maxContours: 1
maxCompositePoints: 0
maxCompositeContours: 0
maxZones: 1
maxTwilightPoints: 0
maxStorage: 0
maxFunctionDefs: 0
maxInstructionDefs: 0
maxStackElements: 0
maxSizeOfInstructions: 0
maxComponentElements: 0
maxCompoenetDepth: 0
'name' Table - Naming Table
---------------------------
Format: 0
Number of Record: 7
Storage offset: 90
Name table 0. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 6
Length: 3
Offset: 0
46 6f 6f > Foo
Name table 1. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 1
Length: 3
Offset: 0
46 6f 6f > Foo
Name table 2. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 2
Length: 7
Offset: 3
52 65 67 75 6c 61 72 > Regular
Name table 3. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 3
Length: 3
Offset: 10
66 6f 6f > foo
Name table 4. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 4
Length: 11
Offset: 13
46 6f 6f 20 52 65 67 75 6c 61 > Foo Regula
72 > r
Name table 5. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 13
Length: 46
Offset: 24
4c 69 63 65 6e 73 65 64 20 75 > Licensed u
6e 64 65 72 20 74 68 65 20 41 > nder the A
70 61 63 68 65 20 4c 69 63 65 > pache Lice
6e 73 65 2c 20 56 65 72 73 69 > nse, Versi
6f 6e 20 32 2e 30 > on 2.0
Name table 6. PlatformID: 1
EncodingID: 0
LanguageID: 0
NameID: 5
Length: 13
Offset: 70
56 65 72 73 69 6f 6e 20 31 2e > Version 1.
30 30 30 > 000
'post' Table - PostScript
-------------------------
'post' format: 1.0
italicAngle: 0.0
underlinePosition: 0
underlineThichness: 0
isFixedPitch: 1d
minMemType42: 0d
maxMemType42: 0d
minMemType1: 0d
maxMemType1: 0d
'OS/2' Table - OS/2 and Windows Metrics
---------------------------------------
'OS/2' version: 5
xAvgCharWidth: 90
usWeightClass: 500 'Medium'
usWidthClass: 5 'Medium'
fsType: 0
ySubscriptXSize: 650
ySubscriptYSize: 699
ySubscriptXOffset: 0
ySubscriptYOffset: 140
ySuperscriptXSize: 650
ySuperscriptYSize: 699
ySuperscriptXOffset: 0
ySuperscriptYOffset: 479
yStrikeoutSize: 49
yStrikeoutPosition 258
sFamilyClass: 0 subclass = 0
PANOSE:
Family Kind: 0 'Any'
Serif Style: 0 'Any'
Weight: 0 'Any'
Proportion: 9 'Monospaced'
Contrast: 0 'Any'
Stroke: 0 'Any'
Arm Style: 0 'Any'
Lettreform: 0 'Any'
Midline: 0 'Any'
X-height: 0 'Any'
Unicode Range 1( Bits 0 - 31 ): 0x00000000
Unicode Range 2( Bits 32 - 63 ): 0x00000000
Unicode Range 3( Bits 64 - 95 ): 0x00000000
Unicode Range 4( Bits 96 - 128 ): 0x00000000
achVendID: 'XXXX'
fsSelection: 0x0040 'Regular '
usFirstCharIndex: 0x0061
usLastCharIndex: 0x0064
sTypoAscender: 200
sTypoDescender: 100
sTypoLineGap: 0
usWinAscent: 90
usWinDescent: 10
CodePage Range 1( Bits 0 - 31 ): 0x00000001
CodePage Range 2( Bits 32- 63 ): 0x00000000
sxHeight: 100
sCapHeight: 40
usDefaultChar: 0x0000
usBreakChar: 0x0000
usMaxContext: 0
Glyph 0.
numberOfContours: 1
xMin: 10
yMin: 10
xMax: 90
yMax: 90
EndPoints
---------
0: 4
Length of Instructions: 0
Flags
-----
0: YDual XDual Y-Short X-Short On
1: YDual XDual Y-Short X-Short On
2: YDual XDual Y-Short X-Short On
3: YDual Y-Short X-Short On
4: XDual Y-Short X-Short On
Coordinates
-----------
0 Rel ( 10, 10) -> Abs ( 10, 10)
1 Rel ( 80, 0) -> Abs ( 90, 10)
2 Rel ( 0, 80) -> Abs ( 90, 90)
3 Rel ( -80, 0) -> Abs ( 10, 90)
4 Rel ( 0, -80) -> Abs ( 10, 10)
Glyph 1.
numberOfContours: 1
xMin: 10
yMin: 10
xMax: 90
yMax: 90
EndPoints
---------
0: 4
Length of Instructions: 0
Flags
-----
0: YDual XDual Y-Short X-Short On
1: YDual XDual Y-Short X-Short On
2: YDual XDual Y-Short X-Short On
3: YDual Y-Short X-Short On
4: XDual Y-Short X-Short On
Coordinates
-----------
0 Rel ( 10, 10) -> Abs ( 10, 10)
1 Rel ( 80, 0) -> Abs ( 90, 10)
2 Rel ( 0, 80) -> Abs ( 90, 90)
3 Rel ( -80, 0) -> Abs ( 10, 90)
4 Rel ( 0, -80) -> Abs ( 10, 10)
Glyph 2.
numberOfContours: 1
xMin: 10
yMin: 10
xMax: 90
yMax: 90
EndPoints
---------
0: 4
Length of Instructions: 0
Flags
-----
0: YDual XDual Y-Short X-Short On
1: YDual XDual Y-Short X-Short On
2: YDual XDual Y-Short X-Short On
3: YDual Y-Short X-Short On
4: XDual Y-Short X-Short On
Coordinates
-----------
0 Rel ( 10, 10) -> Abs ( 10, 10)
1 Rel ( 80, 0) -> Abs ( 90, 10)
2 Rel ( 0, 80) -> Abs ( 90, 90)
3 Rel ( -80, 0) -> Abs ( 10, 90)
4 Rel ( 0, -80) -> Abs ( 10, 10)
But still says this in Chrome:
OTS parsing error: cmap: Failed to serialize table
It looks like OTS just fails for some unknown reason:
>> com.google.fonts/check/036 with (('font[0]', 'Regular.otf'),)
Checking with ots-sanitize.
* FAIL: ots-sanitize returned an error code (1). Output follows:
WARNING: bad search range
WARNING: bad range shift
WARNING: name: name records are not sorted.
WARNING: name: name records are not sorted.
ERROR: cmap: no supported subtables were found
ERROR: cmap: Failed to serialize table
Failed to sanitize file!
But ttfdump and ttx both work fine.
<cmap>
<tableVersion version="0"/>
<cmap_format_4 platformID="3" platEncID="1" language="0">
<map code="0x62" name=".null"/><!-- LATIN SMALL LETTER B -->
<map code="0x64" name="nonmarkingreturn"/><!-- LATIN SMALL LETTER D -->
</cmap_format_4>
</cmap>
Maybe this will help.
1 Answer
It looks like Chrome, which uses OTS, doesn't support format 0.
// We only support a subset of the possible character map tables. Microsoft
// 'strongly recommends' that everyone supports the Unicode BMP table with
// the UCS-4 table for non-BMP glyphs. We'll pass the following subtables:
// Platform ID Encoding ID Format
// 0 0 4 (Unicode Default)
// 0 1 4 (Unicode 1.1)
// 0 3 4 (Unicode BMP)
// 0 3 12 (Unicode UCS-4)
// 0 5 14 (Unicode Variation Sequences)
// 1 0 0 (Mac Roman)
// 3 0 4 (MS Symbol)
// 3 1 4 (MS Unicode BMP)
// 3 10 12 (MS Unicode UCS-4)
// 3 10 13 (MS UCS-4 Fallback mapping)
//
// Note:
// * 0-0-4 and 0-1-4 tables are (usually) written as a 3-1-4 table. If 3-1-4 table
// also exists, the 0-0-4 or 0-1-4 tables are ignored.
// * Unlike 0-0-4 table, 0-3-4 table is written as a 0-3-4 table.
// Some fonts which include 0-5-14 table seems to be required 0-3-4
// table. The 0-3-4 table will be wriiten even if 3-1-4 table also exists.
// * 0-3-12 table is written as a 3-10-12 table. If 3-10-12 table also
// exists, the 0-3-12 table is ignored.
//
https://chromium.googlesource.com/external/ots/+/master/src/cmap.cc#728
answered on Stack Overflow Jan 22, 2019 by 
user10869858
user10869858User contributions licensed under CC BY-SA 3.0