image-in-browser/lib/formats/win-encoder.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

import { OutputBuffer } from '../common/output-buffer.js';
import { LibError } from '../error/lib-error.js';
import { PngEncoder } from './png-encoder.js';
export class WinEncoder {
    constructor() {
        this._type = 0;
        this._supportsAnimation = true;
    }
    get type() {
        return this._type;
    }
    get supportsAnimation() {
        return this._supportsAnimation;
    }
    colorPlanesOrXHotSpot(_index) {
        return 0;
    }
    bitsPerPixelOrYHotSpot(_index) {
        return 0;
    }
    encode(opt) {
        var _a;
        const image = opt.image;
        const singleFrame = (_a = opt.singleFrame) !== null && _a !== void 0 ? _a : false;
        if (image.hasAnimation && !singleFrame) {
            return this.encodeImages(image.frames);
        }
        else {
            return this.encodeImages([image]);
        }
    }
    encodeImages(images) {
        const count = images.length;
        const out = new OutputBuffer();
        out.writeUint16(0);
        out.writeUint16(this._type);
        out.writeUint16(count);
        let offset = 6 + count * 16;
        const imageDataList = [];
        let i = 0;
        for (const img of images) {
            if (img.width > 256 || img.height > 256) {
                throw new LibError('ICO and CUR support only sizes until 256');
            }
            out.writeByte(img.width);
            out.writeByte(img.height);
            out.writeByte(0);
            out.writeByte(0);
            out.writeUint16(this.colorPlanesOrXHotSpot(i));
            out.writeUint16(this.bitsPerPixelOrYHotSpot(i));
            const data = new PngEncoder().encode({
                image: img,
            });
            out.writeUint32(data.length);
            out.writeUint32(offset);
            offset += data.length;
            i++;
            imageDataList.push(data);
        }
        for (const imageData of imageDataList) {
            out.writeBytes(imageData);
        }
        return out.getBytes();
    }
}
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