h-next = free_list[classno];
4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑
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Since every person is different, there’s no one best ergonomic keyboard layout. The standard QWERTY layout is what most people are used to. The Dvorak, Colemak and Workman layouts rearrange the board to put the more commonly used letters closer to the home-key position. All three are intended to minimize your finger movements. That may indeed feel more comfortable and less fatiguing, but people used to the QWERTY layout will likely need to relearn how to type.