Microsoft Visual TrueType(VTT) is a professional-level tool for graphically instructing TrueType and OpenType fonts. For details on the tool visit https://docs.microsoft.com/en-us/typography/tools/vtt/.
Visual TrueType compiles binary from source formats included in the fonts that are instructed with Visual TrueType.
This repo contains source for VTTCompile which is a standalone tool can compile the high level VTT Talk source to a lower level assembler source and then can assemble that source to cooresponding binaries. Since VTT can also generate variation 'cvar' for variable fonts, VTTCompile can also compile the 'cvar' from source format. VTTCompile also includes file management functions to prepare a font for production and to strip source formats for a final 'ship' font binary.
The interface for VTTCompile is similar to VTTShell which is included in Visual TrueType download package.
The source code in the repo is mostly a subset of the source code of Visual TrueType as needed to produce VTTCompile. However not all of the source code included in the repo is necessary to produce VTTCompile but we optomized for including as complete source files as possible to make future maintenance easier.
For documentation of the Visual TrueType source formats visit https://docs.microsoft.com/en-us/typography/tools/vtt/tsi-tables.
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