This syntax is intentional, to prevent a user from accidentally creating overlapping mark classes. Using mark glyph sets is almost the same as mark attachment classes, except the user is required to put '*' in front of mark group name in lookup editing window. VOLT now implements mark filter glyph sets introduced in OpenType specification 1.6. This was one of the most serious compiler limitations without any workaround for font developers to overcome. The compiler is now able to compile GPOS lookups with a large number of defined attachment anchors. In some cases, savings allowed 4x reduction in compiled table size. Savings in size are significant especially with fonts containing a large number of complex contextual lookups. New optimizations towards reducing the size of generated layout tables, including contextual and pair positioning lookups. Multiple bug fixes across VOLT including the compiler, project import and export, and across the UI.Speed improvements for project compilation, loading, and saving.Support for mark filtering sets in compiler and user interface.Compiler optimizations to support fonts containing extensive anchor or cursive attachment lookups. ![]() ![]() Compiler optimizations enabling significant savings in compiled table size.Here is quick list of changes, followed by a detailed description of each: Since the last public Visual OpenType Layout Tool (VOLT) release, we have added various features and made improvements across the product.
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