@poupe/material-color-utilities
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Algorithms and utilities that power the Material Design 3 (M3) color system, including choosing theme colors from images and creating tones of colors; all in a new color space.
46 lines • 1.69 kB
JavaScript
/**
* @license
* Copyright 2021 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as utils from '../utils/color_utils.js';
/**
* Quantizes an image into a map, with keys of ARGB colors, and values of the
* number of times that color appears in the image.
*/
// material_color_utilities is designed to have a consistent API across
// platforms and modular components that can be moved around easily. Using a
// class as a namespace facilitates this.
//
// tslint:disable-next-line:class-as-namespace
export class QuantizerMap {
/**
* @param pixels Colors in ARGB format.
* @return A Map with keys of ARGB colors, and values of the number of times
* the color appears in the image.
*/
static quantize(pixels) {
const countByColor = new Map();
for (let i = 0; i < pixels.length; i++) {
const pixel = pixels[i];
const alpha = utils.alphaFromArgb(pixel);
if (alpha < 255) {
continue;
}
countByColor.set(pixel, (countByColor.get(pixel) ?? 0) + 1);
}
return countByColor;
}
}
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