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How does FontForge convert a quadratic spline into a cubic (when reading truetype)?

April 26, 2017convert cubic fontforge quadratic Reading spline TrueType

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How does FontForge convert a quadratic spline into a cubic (when reading truetype)?

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This is easy since any quadratic spline can already be represented as a cubic, it will just happen that the cubic term is always 0. Probably the control points will no longer be at integral coordinates and there will be some loss of precision when they are saved in a cubic format.