packed delta
VariableFontのPackedDeltaを解析していて、先頭に、0x00があるときがある。
この意味がよくわからない。
例 AdobeVFPrototype.ttf
gvar - “.notdef” - tuple2 dump 0000A75A
0000A750 -- -- -- -- -- -- -- -- -- -- -- -- 00 80 0A EC 00 14 .##............. 0000A760 00 EC 00 14 0A F6 F6 0A 87 80 01 EE EE 82 08 EE ................ 0000A770 EE 0A 0A E4 E4 00 EE EE 82 01 EE 00 00 07 FC F5 ................ 0000A780 04 0B 04 F5 FC 0B 8B 93 00 07 06 13 FA ED FA 13 ................ 0000A790 06 ED 8B 93 00 02 00 0C 00 06 20 00 00 06 20 01 .......... ... .
gvar - “.notdef”-tuple2
address | control | cnt | data | dec | |
0000A75A | 00 | この0の意味がわからない | |||
0000A75B | 80 | 00 | 00 | 0 | |
0000A75C,D | 0A | 00 | EC | -20 | |
0000A75E | 01 | 00 | 0 | ||
0000A75F | 02 | 14 | 20 | ||
0000A760 | 03 | 00 | 0 | ||
0000A761 | 04 | EC | -20 | ||
0000A762 | 05 | 00 | 0 | ||
0000A763 | 06 | 14 | 20 | ||
0000A764 | 07 | 0A | 10 | ||
0000A765 | 08 | F6 | -10 | ||
0000A766 | 09 | F6 | -10 | ||
0000A767 | 10 | 0A | 10 | ||
0000A768 | 87 | 00 | 00 | 0 | |
- | 01 | 00 | 0 | ||
- | 02 | 00 | 0 | ||
- | 03 | 00 | 0 | ||
- | 04 | 00 | 0 | ||
- | 05 | 00 | 0 | ||
- | 06 | 00 | 0 | ||
- | 07 | 00 | 0 | ||
0000A769 | 80 | 00 | 00 | 0 | |
0000A76A,B | 01 | 00 | EE | -18 | |
0000A76C | 01 | EE | -18 | ||
0000A76D | 82 | 00 | 00 | 0 | |
- | 01 | 00 | 0 | ||
- | 02 | 00 | 0 | ||
0000A76E,F | 08 | 00 | EE | -18 | |
0000A770 | 01 | EE | -18 | ||
0000A771 | 02 | 0A | 10 | ||
0000A772 | 03 | 0A | 10 | ||
0000A773 | 04 | E4 | -28 | ||
0000A774 | 05 | E4 | -28 | ||
0000A775 | 06 | 00 | 0 | ||
0000A776 | 07 | EE | -18 | ||
0000A777 | 08 | EE | -18 | ||
0000A778 | 82 | 00 | 00 | 0 | |
- | 01 | 00 | 0 | ||
- | 02 | 00 | 0 | ||
0000A779,A | 01 | 00 | EE | -18 | |
0000A77B | 01 | 00 | 0 |