* reimplement ByteStr as byte_str_t based on hb_ubytes_t
Unuse start_embed<ByteStr>
Also renamed SubByteStr to byte_str_ref_t
More renaming to come
* substr renamed to str_ref in line with its type byte_str_ref_t
* uncamelize non-table struct names
* uncamelized non-struct types OpCode etc
* add byte_str_t copy ctor
* test
* test2
* undo tests
* fix bot failure
* undo the previous change
* fixed tabs, added inline
* Revert "fixed tabs, added inline"
This reverts commit 21163c30e9.
* fix tabs
Templatized ArgStack so it may store the default value along with blend deltas as BlendArg while parsing blend operator arguments in CFF2 charstring
Added get_region_count() method to VarRegionList & VariationStore
Subr-flattened charstrings are temporarily re-encoded in ByteStrBuff during "plan" phase, then copied to hb_serialize_context_t during "write" phase
CSOpSet may callback opcode processing "virtual" functions via CRTP
Numer struct may store a value as fixed optionally in addition to int and float
along with CFF2 charstring interpreter
factored out common code between CFF1 & CFF2 to CSInterpreter
moved fetch_op from Interpreter to InterpEnv
misc code clean up & bug fixes
Unreferenced subroutines are nullified (not removed) in a subset font
Separate Interpreter struct from hb-ot-cff-common-private.hh in a set of four header files, augmented for CharString (CS):
hb-cff-interp-common-private.hh
hb-cff-interp-dict-common-private.hh
hb-cff-interp-cs-common-private.hh
hb-cff-interp-cs.hh
Interpreter runtime is separated off as a new struct InterpEnv sub-classed differently for Dict and CharString (CS)