@cantoo/pdf-lib/cjs/core/embedders/PngEmbedder.js

Create and modify PDF files with JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const png_1 = require("../../utils/png");
/**
 * A note of thanks to the developers of https://github.com/foliojs/pdfkit, as
 * this class borrows from:
 *   https://github.com/devongovett/pdfkit/blob/e71edab0dd4657b5a767804ba86c94c58d01fbca/lib/image/png.coffee
 */
class PngEmbedder {
    static for(imageData) {
        return tslib_1.__awaiter(this, void 0, void 0, function* () {
            const png = png_1.PNG.load(imageData);
            return new PngEmbedder(png);
        });
    }
    constructor(png) {
        this.image = png;
        this.bitsPerComponent = png.bitsPerComponent;
        this.width = png.width;
        this.height = png.height;
        this.colorSpace = 'DeviceRGB';
    }
    embedIntoContext(context, ref) {
        return tslib_1.__awaiter(this, void 0, void 0, function* () {
            const SMask = this.embedAlphaChannel(context);
            const xObject = context.flateStream(this.image.rgbChannel, {
                Type: 'XObject',
                Subtype: 'Image',
                BitsPerComponent: this.image.bitsPerComponent,
                Width: this.image.width,
                Height: this.image.height,
                ColorSpace: this.colorSpace,
                SMask,
            });
            if (ref) {
                context.assign(ref, xObject);
                return ref;
            }
            else {
                return context.register(xObject);
            }
        });
    }
    embedAlphaChannel(context) {
        if (!this.image.alphaChannel)
            return undefined;
        const xObject = context.flateStream(this.image.alphaChannel, {
            Type: 'XObject',
            Subtype: 'Image',
            Height: this.image.height,
            Width: this.image.width,
            BitsPerComponent: this.image.bitsPerComponent,
            ColorSpace: 'DeviceGray',
            Decode: [0, 1],
        });
        return context.register(xObject);
    }
}
exports.default = PngEmbedder;
//# sourceMappingURL=PngEmbedder.js.map