nblend() [3/4]

CRGB & fl::nblend	(	CRGB &	existing,
		const CRGB &	overlay,
		fract8	amountOfOverlay )

Definition at line 20 of file colorutils.cpp.

                                                                          {
    if (amountOfOverlay == 0) {
        return existing;
    }
 
    if (amountOfOverlay == 255) {
        existing = overlay;
        return existing;
    }
 
#if 0
    // Old blend method which unfortunately had some rounding errors
    fract8 amountOfKeep = 255 - amountOfOverlay;
 
    existing.red   = scale8_LEAVING_R1_DIRTY( existing.red,   amountOfKeep)
                    + scale8_LEAVING_R1_DIRTY( overlay.red,    amountOfOverlay);
    existing.green = scale8_LEAVING_R1_DIRTY( existing.green, amountOfKeep)
                    + scale8_LEAVING_R1_DIRTY( overlay.green,  amountOfOverlay);
    existing.blue  = scale8_LEAVING_R1_DIRTY( existing.blue,  amountOfKeep)
                    + scale8_LEAVING_R1_DIRTY( overlay.blue,   amountOfOverlay);
 
    cleanup_R1();
#else
    // Corrected blend method, with no loss-of-precision rounding errors
    existing.red = blend8(existing.red, overlay.red, amountOfOverlay);
    existing.green = blend8(existing.green, overlay.green, amountOfOverlay);
    existing.blue = blend8(existing.blue, overlay.blue, amountOfOverlay);
#endif
 
    return existing;
}

References blend8(), cleanup_R1(), and scale8_LEAVING_R1_DIRTY().

Referenced by blend(), blend(), fl::Pride2015::draw(), nblend(), and nblend().

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