image-js/lib/load/decodeBmp.js

Image processing and manipulation in JavaScript

import { decode } from 'fast-bmp';
import { Image } from "../Image.js";
import { Mask } from "../Mask.js";
/**
 * Decode a BMP. See the fast-bmp npm module.
 * @param data - The data to decode.
 * @returns The decoded image or mask.
 */
export function decodeBmp(data) {
    const decodedData = decode(data);
    if (decodedData.bitsPerPixel === 1) {
        const mask = new Mask(decodedData.width, decodedData.height, {
            data: decodedData.data,
        });
        return mask.convertColor('GREY');
    }
    else {
        let colorModel;
        switch (decodedData.channels) {
            case 1:
                colorModel = 'GREY';
                break;
            case 3:
                colorModel = 'RGB';
                break;
            default:
                colorModel = 'RGBA';
                break;
        }
        return new Image(decodedData.width, decodedData.height, {
            colorModel,
            data: decodedData.data,
            resolution: getBmpResolution(decodedData),
        });
    }
}
/**
 * Gets image's resolution from its parsed data. BMP stores resolution in
 * pixels per meter.
 * @param bmp - Parsed BMP image.
 * @returns Object with resolution data if it is defined.
 */
function getBmpResolution(bmp) {
    if (!bmp.xPixelsPerMeter || !bmp.yPixelsPerMeter) {
        return undefined;
    }
    return {
        x: bmp.xPixelsPerMeter,
        y: bmp.yPixelsPerMeter,
        unit: 'meter',
    };
}
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