Previous priority implementation would move a node further back within it's layer, but at max priority was unable to move any further up than that. This updates the implementation to have 3 priority levels:
1. Distance is reduced by half of table size.
2. Distance is reduced by full table size (move to beginning of the layer).
3. Distance is set to 0. Vertex will be packed as soon as possible.
Also makes the iterative resolutions aware of max priority, so it won't keep trying to raise priority beyond the maximum.
Ligature subtables use virtual links to enforce an ordering constraint between the subtables and the coverage table. Unfortunately this has the sideeffect of prevent the subtables from being shared by another Ligature with a different coverage table since object equality compares all links real and virtual. This change makes virtual links stored separately from real links and updates the equality check to only check real links. If an object is de-duped any virtual links it has are merged into the object that replaces it.
The current CMAP4 implementation uses whatever the current codepoint ranges are and then encodes them as indivudal glyph ids or as a delta if possible. However, it's often possible to save bytes by splitting up existing ranges and encoding parts of them using deltas where the cost of splitting the range is less than encoding each glyph individual.
We implicitly require it for building ragel subproject. This new version
requirement should satisfied in both Fedora 33 and Debian bullseye, and
not be too cutting edge for us.
./subprojects/harfbuzz/src/hb-array.hh:71:25: warning: 'constexpr' non-static member function will not be implicitly 'const' in C++14; add 'const' to avoid a change in behavior [-Wconstexpr-not-const]
constexpr hb_array_t& operator = (const hb_array_t<U> &o)
^
const
../subprojects/harfbuzz/src/hb-array.hh:72:5: warning: use of this statement in a constexpr function is a C++14 extension [-Wc++14-extensions]
{ arrayZ = o.arrayZ; length = o.length; backwards_length = o.backwards_length; return *this; }
^
../subprojects/harfbuzz/src/hb-array.hh:329:32: warning: 'constexpr' non-static member function will not be implicitly 'const' in C++14; add 'const' to avoid a change in behavior [-Wconstexpr-not-const]
constexpr hb_sorted_array_t& operator = (const hb_array_t<U> &o)
^
const
../subprojects/harfbuzz/src/hb-array.hh:330:5: warning: use of this statement in a constexpr function is a C++14 extension [-Wc++14-extensions]
{ hb_array_t<Type> (*this) = o; return *this; }
^
4 warnings generated.
../src/hb-map.hh:44:38: note: non-constexpr constructor 'hb_array_t' cannot be used in a constant expression
static constexpr K INVALID_KEY = kINVALID;
^
Not all impls implement nullptr_t in a way that would automatically
convert to what we were accepting.
In file included from ../src/test-map.cc:27:
../src/hb-map.hh:44:22: error: no viable conversion from 'nullptr_t' to 'const hb_array_t<const char>'
static constexpr K INVALID_KEY = kINVALID;
^ ~~~~~~~~
Garret Rieger
David Corbett
Behdad Esfahbod
Qunxin Liu
Khaled Hosny