@pdfme/pdf-lib/dist/esm/__tests__/core/embedders/CustomFontEmbedder.spec.js

Create and modify PDF files with JavaScript

import fontkit from '@pdf-lib/fontkit';
import fs from 'fs';
import { CustomFontEmbedder, PDFContext, PDFDict, PDFHexString, PDFRef, } from '../../../src/index';
const ubuntuFont = fs.readFileSync('./assets/fonts/ubuntu/Ubuntu-R.ttf');
describe(`CustomFontEmbedder`, () => {
    it(`can be constructed with CustomFontEmbedder.for(...)`, async () => {
        const embedder = await CustomFontEmbedder.for(fontkit, ubuntuFont);
        expect(embedder).toBeInstanceOf(CustomFontEmbedder);
    });
    it(`exposes the font's name`, async () => {
        const embedder = await CustomFontEmbedder.for(fontkit, new Uint8Array(ubuntuFont));
        expect(embedder.fontName).toBe('Ubuntu');
    });
    it(`can set a custom font name`, async () => {
        const customName = 'abc123';
        const embedder = await CustomFontEmbedder.for(fontkit, new Uint8Array(ubuntuFont), customName);
        expect(embedder.customName).toBe(customName);
    });
    it(`can embed font dictionaries into PDFContexts without a predefined ref`, async () => {
        const context = PDFContext.create();
        const embedder = await CustomFontEmbedder.for(fontkit, new Uint8Array(ubuntuFont));
        expect(context.enumerateIndirectObjects().length).toBe(0);
        const ref = await embedder.embedIntoContext(context);
        expect(context.enumerateIndirectObjects().length).toBe(5);
        expect(context.lookup(ref)).toBeInstanceOf(PDFDict);
    });
    it(`can embed font dictionaries into PDFContexts with a predefined ref`, async () => {
        const context = PDFContext.create();
        const predefinedRef = PDFRef.of(9999);
        const embedder = await CustomFontEmbedder.for(fontkit, new Uint8Array(ubuntuFont));
        expect(context.enumerateIndirectObjects().length).toBe(0);
        const ref = await embedder.embedIntoContext(context, predefinedRef);
        expect(context.enumerateIndirectObjects().length).toBe(5);
        expect(context.lookup(predefinedRef)).toBeInstanceOf(PDFDict);
        expect(ref).toBe(predefinedRef);
    });
    it(`can encode text strings into PDFHexString objects`, async () => {
        const text = 'Stuff and thingz!';
        const hexCodes = '00360057005801AA000300440051004700030057004B004C0051004A005D0004';
        const embedder = await CustomFontEmbedder.for(fontkit, ubuntuFont);
        expect(embedder.encodeText(text)).toBeInstanceOf(PDFHexString);
        expect(String(embedder.encodeText(text))).toBe(String(PDFHexString.of(hexCodes)));
    });
    it(`can measure the width of text strings at the given font size`, async () => {
        const text = 'Stuff and thingz!';
        const embedder = await CustomFontEmbedder.for(fontkit, ubuntuFont);
        expect(embedder.widthOfTextAtSize(text, 12)).toBe(90.672);
        expect(embedder.widthOfTextAtSize(text, 24)).toBe(181.344);
    });
    it(`can measure the height of the font at the given size`, async () => {
        const embedder = await CustomFontEmbedder.for(fontkit, ubuntuFont);
        expect(embedder.heightOfFontAtSize(12)).toBeCloseTo(13.452);
        expect(embedder.heightOfFontAtSize(24)).toBeCloseTo(26.904);
    });
    it(`can measure the size of the font at a given height`, async () => {
        const embedder = await CustomFontEmbedder.for(fontkit, ubuntuFont);
        expect(embedder.sizeOfFontAtHeight(12)).toBeCloseTo(10.705);
        expect(embedder.sizeOfFontAtHeight(24)).toBeCloseTo(21.409);
    });
});
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