Sprinkle constexpr around

Being conservative.  Also not sure it makes any real difference
in our codebase.

Remove unused 'inline' specifier

[amalgam] Add hb.cc to git

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

Minor

[amalgam] Fix UCD issue

This actually makes it build now!

Part https://github.com/harfbuzz/harfbuzz/issues/1809

Keeping open to add tests, CI, etc.

[amalgam] Fix CFF

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

[amalgam] Finish fixing Indic-like shapers

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

[use] Remove Syriac features

This was non-standard, and unused anyway.

[amalgam] More Indic-like issues

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

[amalgam] More

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

[amalgam] Fix most duplicate-id instances in Indic-like shapers

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

Add make rule to build hb.cc

Part of https://github.com/harfbuzz/harfbuzz/issues/1809

Add ucd-table make target

add bimap test along with bug fix/tweaks

Merge pull request #1806 from carlo-bramini/master

Make harfbuzz working on all existing versions of Windows

[dwrite] Apply minor style improves

Fix error rised by GCC8+

Use lower case file name with #include

I tried to cross compile harfbuzz for Windows and an error was generated because `DWrite_1.h` was not found.
This happened because the filesystem is case sensitive and for this reason that include file was not found.
The right name of the file to be used is `dwrite_1.h`, with all letters not capitalized:
https://docs.microsoft.com/en-us/windows/desktop/api/dwrite_1/
I also verified in the installation of VS2017 with Windows Kit v10 and in that place it was also lower case.
So, in my opinion it should be better to change this.

Empty DIRECTWRITE_LIBS

Not used anymore since DWRITE is loaded dynamically.

Dynamically load DWRITE

Also checks if DWriteCreateFactory() has been executed successfully.

[config] Fix CoreText build with NO_AAT

Apply some minor improves on CFFIndex

minor, reuse StructAtOffset logic in StructAtOffsetOrNull

minor style improve in hb-cff-interp-common.hh

style fix for pylint complain

[config] Add links

[test] Make Unicode tests strict against internal UCD

https://github.com/harfbuzz/harfbuzz/pull/1799

Test at least one character per Unicode version

Merge pull request #1800 from harfbuzz/harfbuzz/cffnull_fix2

[CFF] fix for Subrs null ptr access

add test case file

alternate fix for https://crbug.com/971933

[config] Don't disable emoji sequences in HB_TINY

It makes sense to disable this code these if editing is not needed.
However, this is also necessary to correctly display emoji sequences
in right-to-left direction.  For that reason, don't auto-disable it.

[config] Compile out modified combining-class if HB_NO_OT_SHAPE

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[emoji] Port generator to packtab

[config] Add HB_NO_EMOJI

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_SHAPER

Don't know who would want when why.  But makes sense to have.

[config] Add HB_NO_OT_TAG

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Fix build with HB_NO_OT_LAYOUT

[config] Add dependency

[config] Add dependency

[config] Rename HB_NO_SHAPE_AAT to HB_NO_AAT_SHAPE

[config] Add HB_NO_OT_LAYOUT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Enable HB_NO_OT_FONT in HB_NO_OT

[config] Add HB_NO_OT_SHAPE / HB_NO_OT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Fail compile if no shapers enabled

[src] Add make targets "tiny" and "tinyz"

2.5.3

[gen-ucd] Protect against accidents like previous commit

https://github.com/harfbuzz/harfbuzz/pull/1796

[ucd] Include scripts added in Unicode 10 or later

minor

add ops & methods to hb_bimap_t making it more like hb_map_t
moved has () to hb_bimap_t from hb_inc_bimap_t
moved identity () to hb_inc_bimap_t
removed forward()

add hb_bimap_t, subclass hb_inc_bimap_t replacing CFF::remap_t

Categorize U+1133B for use in Tamil

Correct "nonunihan" to "nounihan"

Replace create_from_file with empty blob if HB_NO_OPEN is defined

Cast long->size_t to ensure comparison of similar types

[ucd] Use custom encoding to shrink composition data

Saves another 2.5kb.

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[ucd] Save a few more bytes

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[subset] VORG table to use _subset2 method and new iterator frameworks

Merge pull request #1788 from jameshilliard/configure-svg

Add missing cairo-svg dependency to test-ot-color

Add missing cairo-svg dependency to test-ot-color

[config/ucd] Add HB_NO_UNICODE_UNASSIGNED and activate in HB_TINY

Saves another 12kb:

$ python ./gen-ucd-table.py ucd.nounihan.grouped.zip > hb-ucd-table.hh && make -j5 CPPFLAGS='-Os -DHB_TINY' -C ~/hb/build/src/  && size ~/hb/build/src/.libs/libharfbuzz_la-hb-ucd.o
INFO: Loading UCDXML...
INFO: Preparing data tables...
INFO: Generating output...
INFO:   Compression=1:
INFO:       Dataset=gc       FullCost=18612
INFO:       Dataset=ccc      FullCost=3550
INFO:       Dataset=bmg      FullCost=1548
INFO:       Dataset=sc       FullCost=17765
INFO:       Dataset=dm       FullCost=13325
INFO:   Compression=3:
INFO:       Dataset=gc       FullCost=10726
INFO:       Dataset=ccc      FullCost=2389
INFO:       Dataset=bmg      FullCost=1052
INFO:       Dataset=sc       FullCost=13669
INFO:       Dataset=dm       FullCost=7780
INFO:   Compression=5:
INFO:       Dataset=gc       FullCost=8274
INFO:       Dataset=ccc      FullCost=2055
INFO:       Dataset=bmg      FullCost=908
INFO:       Dataset=sc       FullCost=4073
INFO:       Dataset=dm       FullCost=7780
INFO: Done.

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Make test build under HB_TINY

Don't define hb_blob_create_from_file if HB_NO_OPEN is defined

Fix build with -O0

message_impl was not defined.  That causes trouble if compiler didn't
optimize the unreachable call out...

2.5.2

[config] Adjust description of HB_LEAN

https://github.com/harfbuzz/harfbuzz/commit/d84932ba50482b3b47e393714eb77b19173d1f14

[config] Add HB_NO_LAYOUT_COLLECT_GLYPHS

Part of

[config] Add HB_NO_LAYOUT_FEATURE_PARAMS

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_FACE_COLLECT_UNICODES

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_CMAP_LEGACY_SUBTABLES

Part of https://vimeo.com/331852453/06eec89c65

Fix MSVC build

MSVC warning:

c:\projects\harfbuzz\src\hb-ot-layout-gsubgpos.hh(2732): error C2121: '#': invalid character: possibly the result of a macro expansion [C:\projects\harfbuzz\build\harfbuzz.vcxproj]

Clang warning for it:

./hb-ot-layout-gsubgpos.hh:2729:2: error: embedding a directive within macro arguments has undefined behavior [-Werror,-Wembedded-directive]

[config] Add HB_NO_HINTING, enabled by HB_TINY

Disables HintingDevice tables and Anchors addressing contour points.

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_VAR to disable variations support, enabled by HB_TINY

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_OT_FONT_GLYPH_NAMES

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[subset] Simplify collect_name_ids

[config] Add HB_NO_STAT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Don't include name table in face if HB_NO_NAME

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Disable hb-ot-font code if HB_NO_OT_FONT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[ucd] Print out table sizes

[config] Disable AAT map

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Disable more legacy kerning

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] More trak disabling

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] add HB_NO_OT_SHAPE_FRACTIONS, enabled in HB_LEAN

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Minor trak disable

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_LANGUAGE_PRIVATE_SUBTAG

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Restructure code

[config] Remove remaining AAT context bits if HB_NO_OT_KERN

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Add HB_NO_OT_KERN, enabled by HB_MINI / HB_NO_LEGACY

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

Fix build

[config] Remove tables from hb_face_t for disabled features

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

coretext: remove trailing macro from SCRATCH_RESTORE

[coretext/uniscribe/directwrite] Remove extra semicolons

Fixes https://github.com/harfbuzz/harfbuzz/pull/1783

Remove dead code

[config] Don't use VORG table if HB_NO_OT_FONT_CFF

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Fixup for AAT ltag table access

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] One more morx disabling

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Don't compile AAT API if HB_NO_AAT

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Don't compile unused layout API if HB_NO_LAYOUT_UNUSED

Part of https://github.com/harfbuzz/harfbuzz/issues/1652

[config] Dont' compile buffer message API if HB_NO_BUFFER_MESSAGE

Part of https://github.com/harfbuzz/harfbuzz/issues/1652