oppi.li
1import {pngChunks, imageInfo} from './image.js';
2
3const pngNoPhys = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAADUlEQVQIHQECAP3/AAAAAgABzePRKwAAAABJRU5ErkJggg==';
4const pngPhys = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAACXBIWXMAABYlAAAWJQFJUiTwAAAAEElEQVQI12OQNZcAIgYIBQAL8gGxdzzM0A==';
5const pngEmpty = 'data:image/png;base64,';
6
7async function dataUriToBlob(datauri) {
8 return await (await globalThis.fetch(datauri)).blob();
9}
10
11test('pngChunks', async () => {
12 expect(await pngChunks(await dataUriToBlob(pngNoPhys))).toEqual([
13 {name: 'IHDR', data: new Uint8Array([0, 0, 0, 1, 0, 0, 0, 1, 8, 0, 0, 0, 0])},
14 {name: 'IDAT', data: new Uint8Array([8, 29, 1, 2, 0, 253, 255, 0, 0, 0, 2, 0, 1])},
15 {name: 'IEND', data: new Uint8Array([])},
16 ]);
17 expect(await pngChunks(await dataUriToBlob(pngPhys))).toEqual([
18 {name: 'IHDR', data: new Uint8Array([0, 0, 0, 2, 0, 0, 0, 2, 8, 2, 0, 0, 0])},
19 {name: 'pHYs', data: new Uint8Array([0, 0, 22, 37, 0, 0, 22, 37, 1])},
20 {name: 'IDAT', data: new Uint8Array([8, 215, 99, 144, 53, 151, 0, 34, 6, 8, 5, 0, 11, 242, 1, 177])},
21 ]);
22 expect(await pngChunks(await dataUriToBlob(pngEmpty))).toEqual([]);
23});
24
25test('imageInfo', async () => {
26 expect(await imageInfo(await dataUriToBlob(pngNoPhys))).toEqual({width: 1, dppx: 1});
27 expect(await imageInfo(await dataUriToBlob(pngPhys))).toEqual({width: 2, dppx: 2});
28 expect(await imageInfo(await dataUriToBlob(pngEmpty))).toEqual({width: 0, dppx: 1});
29});