User Guide

FontLab 4
544
Active and Inactive Delta Instructions
Delta instructions may be active or inactive. When the current PPM is
within the PPM range of the delta instruction the instruction is active.
Otherwise it is inactive.
Active delta instruction (shift up)
Inactive delta instruction
Note: if you set a new middle delta instruction at a point where a delta
instruction is already set and is active the old instruction will be replaced
by the new one.
If you set delta instructions for the same point and with the same shift
distance but for different PPM ranges FontLab will try to combine PPM
ranges and unite delta instructions where it is possible.