blur2d() [2/4]

void fl::gfx::blur2d	(	CRGB *	leds,
		u8	width,
		u8	height,
		fract8	blur_amount )

Legacy version of blur2d, which does not require an XYMap but instead implicitly binds to XY() function.

If you are hitting a linker error here, then use blur2d(..., const fl::XYMap& xymap) instead.

Definition at line 94 of file blur.cpp.hpp.

                                                                                  {
    // Legacy path: uses global XY() via XYMap for user-defined layouts.
    // Keeps its own blur algorithm copy because XYMap indexing differs from
    // the cache-coherent rectangular layout used by Canvas.
    XYMap xyMap =
        XYMap::constructWithUserFunction(width, height, xy_legacy_wrapper);
    fl::u8 keep = 255 - blur_amount;
    fl::u8 seep = blur_amount >> 1;
    // blur rows
    for (fl::u8 row = 0; row < height; ++row) {
        CRGB carryover = CRGB::Black;
        for (fl::u8 i = 0; i < width; ++i) {
            CRGB cur = leds[xyMap.mapToIndex(i, row)];
            CRGB part = cur;
            part.nscale8(seep);
            cur.nscale8(keep);
            cur += carryover;
            if (i)
                leds[xyMap.mapToIndex(i - 1, row)] += part;
            leds[xyMap.mapToIndex(i, row)] = cur;
            carryover = part;
        }
    }
    // blur columns
    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;
        }
    }
}

References fl::CRGB::Black, fl::XYMap::constructWithUserFunction(), fl::cur, fl::FL_NO_EXCEPT, fl::height, leds, fl::CRGB::nscale8(), fl::width, and xyMap.

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