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End-to-End Tour of Text Layout/Rendering (2015)
I’ve found that there is a fair amount of confusion regarding how text rendering actually ends up working. In particular, it seems that the ...
Both Apple’s and Microsoft’s extensions to the font file includes rules for “advanced” layout, which specify the updates and replacements to the glyph/location sequence. Then, the rest of the ‘morx’ table consists of a sequence of subtables which define a particular substitution or modification to perform, as well as which bit in the sub-feature vector that their operation is predicated on. TrueType uses the ‘glyf’ table, which defines the contours of each glyph as a sequence of quadratic bezier curves, laid back to front.
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