blurColumns()

void fl::blurColumns	(	CRGB *	leds,
		fl::u8	width,
		fl::u8	height,
		fract8	blur_amount,
		const XYMap &	xyMap )

Perform a blur1d() on every column of a rectangular matrix.

See also

blur1d()

Parameters

leds	a pointer to the LED array to blur
width	the width of the matrix
height	the height of the matrix
blur_amount	the amount of blur to apply

Definition at line 113 of file blur.cpp.

                                     {
    // blur columns
    fl::u8 keep = 255 - blur_amount;
    fl::u8 seep = blur_amount >> 1;
    for (fl::u8 col = 0; col < width; ++col) {
        CRGB carryover = CRGB::Black;
        for (fl::u8 i = 0; i < height; ++i) {
            CRGB cur = leds[xyMap.mapToIndex(col, i)];
            CRGB part = cur;
            part.nscale8(seep);
            cur.nscale8(keep);
            cur += carryover;
            if (i)
                leds[xyMap.mapToIndex(col, i - 1)] += part;
            leds[xyMap.mapToIndex(col, i)] = cur;
            carryover = part;
        }
    }
}