init()

static FASTLED_FORCE_INLINE void fl::BinaryDither::init ( u8(&) d[3], u8(&) e[3], const u8(&) scale[3], u8 frame )

inlinestatic

Set up e from the per-channel brightness scale and d from frame.

Lower brightness needs a bigger offset: e = 256/scale, so the offset spans one output step's worth of input. A zero scale (unlit channel) gets no dither.

Definition at line 151 of file binary_dither.h.

                                                                 {
        const u8 q = phase(frame);
        for (int i = 0; i < 3; ++i) {
            // Computed in a local and stored once; re-reading `e[i]` after
            // the `d[i]` store cost 36 B on AVR (#4672).
            const u8 s = scale[i];
            u8 range = s ? (256 / s) + 1 : 0;
            d[i] = offset(q, range);
            if (range) { --range; }
            e[i] = range;
        }
    }

References FASTLED_FORCE_INLINE, fl::FL_NO_EXCEPT, offset(), phase(), and scale.

Referenced by PixelController< RGB_ORDER, LANES, MASK >::init_binary_dithering().

Here is the call graph for this function:

Here is the caller graph for this function: