Led Server Utilities

Moved some utility function (interpolations & blendings) from JavaScript to a node native add-on (which will hopefully speed up some of the calculations of the LED server that happen pretty often).

Functions

• interpolatePixels - interpolates between two colors - don't use this in practice, it's slower than the JS/TS equivalent
• interpolateTwoLayers - interpolates two layers pixel by pixel
• applyKernelToLayer - applies a kernel to a layer
• dimLayer - dims a layer
• blendPixels - blends an array of pixels
• blendTwoPixels - blends two colors
• blendLayers - blends an array of layers pixel by pixel

Interpolations

• Linear
• EaseIn
• EaseOut
• EaseInOut

Blend Modes

Add, Subtract, Multiply, Screen, Overlay, HardLight, SoftLight, Divide, Difference, Darken, Lighten, Replace, Dissolve

Examples

const white = {r: 1, g: 1, b: 1, n: 1};
const black = {r: 0, g: 0, b: 0, n: 1};
const red = {r: 1, g: 0, b: 0, n: 1};
const green = {r: 0, g: 1, b: 0, n: 1};

interpolatePixels(white, black, 0.3);
interpolatePixels(null, black, 0.3);
interpolatePixels(null, null, 0.3);

interpolateTwoLayers(null, null, 0.3);
interpolateTwoLayers([white], [black], 0.3);
interpolateTwoLayers([white, black], [black, white], 0.3);
interpolateTwoLayers([white], [black, white], 0.3);
interpolateTwoLayers(null, [black, white], 0.3);

blendTwoPixels(red, green, 'Replace');
blendTwoPixels(red, green, 'Add');
blendTwoPixels(red, green, 'Difference', true);
blendTwoPixels(white, red, 'Multiply');

blendPixels([white, red, green], 'Difference');
blendPixels([red, green], 'Add');

blendLayers(
    [
        [white, black, red, green],
        [red, red],
        [null, null, green]
    ],
    'Replace'
);
blendLayers(
    [
        [white, black, red, green],
        [red, red],
        [null, null, green]
    ],
    'Add'
);
blendLayers(
    [
        [white, black, red, green],
        [red, red],
        [null, null, green]
    ],
    'Dissolve'
);