bilinearExpandFloat()

void fl::bilinearExpandFloat	(	const CRGB *	input,
		CRGB *	output,
		uint8_t	inputWidth,
		uint8_t	inputHeight,
		XYMap	xyMap )

Definition at line 232 of file bilinear_expansion.cpp.

                                                           {
    uint8_t outputWidth = xyMap.getWidth();
    uint8_t outputHeight = xyMap.getHeight();
    if (outputWidth != xyMap.getWidth() || outputHeight != xyMap.getHeight()) {
        // xyMap has width and height that do not fit in a uint8_t.
        return;
    }
    uint16_t n = xyMap.getTotal();
 
    for (uint8_t y = 0; y < outputHeight; y++) {
        for (uint8_t x = 0; x < outputWidth; x++) {
            // Map output pixel to input grid position
            float fx =
                static_cast<float>(x) * (inputWidth - 1) / (outputWidth - 1);
            float fy =
                static_cast<float>(y) * (inputHeight - 1) / (outputHeight - 1);
 
            uint8_t ix = static_cast<uint8_t>(fx);
            uint8_t iy = static_cast<uint8_t>(fy);
            float dx = fx - ix;
            float dy = fy - iy;
 
            uint8_t ix1 = (ix + 1 < inputWidth) ? ix + 1 : ix;
            uint8_t iy1 = (iy + 1 < inputHeight) ? iy + 1 : iy;
 
            uint16_t i00 = iy * inputWidth + ix;
            uint16_t i10 = iy * inputWidth + ix1;
            uint16_t i01 = iy1 * inputWidth + ix;
            uint16_t i11 = iy1 * inputWidth + ix1;
 
            CRGB c00 = input[i00];
            CRGB c10 = input[i10];
            CRGB c01 = input[i01];
            CRGB c11 = input[i11];
 
            CRGB result;
            result.r =
                bilinearInterpolateFloat(c00.r, c10.r, c01.r, c11.r, dx, dy);
            result.g =
                bilinearInterpolateFloat(c00.g, c10.g, c01.g, c11.g, dx, dy);
            result.b =
                bilinearInterpolateFloat(c00.b, c10.b, c01.b, c11.b, dx, dy);
 
            uint16_t idx = xyMap.mapToIndex(x, y);
            if (idx < n) {
                output[idx] = result;
            }
        }
    }
}

References bilinearInterpolateFloat(), x, xyMap, and y.

Referenced by fl::ScaleUp::expand().

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