blurColumns()

void fl::blurColumns	(	CRGB *	leds,
		uint8_t	width,
		uint8_t	height,
		fract8	blur_amount,
		const fl::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 111 of file blur.cpp.

                                     {
    // blur columns
    uint8_t keep = 255 - blur_amount;
    uint8_t seep = blur_amount >> 1;
    for (uint8_t col = 0; col < width; ++col) {
        CRGB carryover = CRGB::Black;
        for (uint8_t 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;
        }
    }
}

References CRGB::Black, leds, CRGB::nscale8(), and xyMap.

Referenced by blur2d().

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