concat-color-matrices/dist/index.js

Functions for combining color matrices

import invariant from 'invariant';
export const concatTwoColorMatrices = (matB, matA) => {
    invariant(Array.isArray(matB) && matB.length === 20, `Color matrix matB should be an array with 20 elements.`);
    invariant(Array.isArray(matA) && matA.length === 20, `Color matrix matA should be an array with 20 elements.`);
    const tmp = Array(20);
    let index = 0;
    for (let j = 0; j < 20; j += 5) {
        for (let i = 0; i < 4; i++) {
            tmp[index++] = matA[j + 0] * matB[i + 0] + matA[j + 1] * matB[i + 5] +
                matA[j + 2] * matB[i + 10] + matA[j + 3] * matB[i + 15];
        }
        tmp[index++] = matA[j + 0] * matB[4] + matA[j + 1] * matB[9] +
            matA[j + 2] * matB[14] + matA[j + 3] * matB[19] + matA[j + 4];
    }
    return tmp;
};
export const concatColorMatrices = (matrices) => {
    invariant(Array.isArray(matrices) && matrices.length > 0, `Matrices should be an array of non zero length.`);
    return matrices.reduce(concatTwoColorMatrices);
};
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