Lotus CIandClaude Opus 5.5
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Compression re-encodes through a canvas to JPEG. Only PNG was skipped, so a transparent WebP came out on a black background, and an animated GIF or WebP became one still frame. GIF and APNG are no longer offered; an animated WebP (VP8X animation flag) or any image with a transparent pixel is kept as the original. Fixes #331 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5
68 lines
2.6 KiB
TypeScript
68 lines
2.6 KiB
TypeScript
import { test } from 'node:test';
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import assert from 'node:assert/strict';
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import {
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formatFileSize,
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hasTransparency,
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isAnimatedWebp,
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isCompressible,
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} from './imageCompression';
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test('formatFileSize formats bytes below 1KB as B', () => {
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assert.equal(formatFileSize(0), '0 B');
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assert.equal(formatFileSize(1), '1 B');
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assert.equal(formatFileSize(512), '512 B');
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assert.equal(formatFileSize(1023), '1023 B');
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});
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test('formatFileSize formats values in the KB range', () => {
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assert.equal(formatFileSize(1024), '1.0 KB');
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assert.equal(formatFileSize(1536), '1.5 KB');
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// 1024 * 1024 - 1 is still under the MB boundary
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assert.equal(formatFileSize(1024 * 1024 - 1), '1024.0 KB');
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});
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test('formatFileSize formats values in the MB range', () => {
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assert.equal(formatFileSize(1024 * 1024), '1.0 MB');
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assert.equal(formatFileSize(1024 * 1024 * 1.5), '1.5 MB');
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assert.equal(formatFileSize(1024 * 1024 * 10), '10.0 MB');
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});
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test('isCompressible accepts raster image types', () => {
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assert.equal(isCompressible({ type: 'image/png' } as Blob), true);
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assert.equal(isCompressible({ type: 'image/jpeg' } as Blob), true);
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assert.equal(isCompressible({ type: 'image/webp' } as Blob), true);
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});
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test('isCompressible rejects svg, empty type, and non-images', () => {
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assert.equal(isCompressible({ type: 'image/svg+xml' } as Blob), false);
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// [Gitea #331] usually animated; a canvas keeps one frame
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assert.equal(isCompressible({ type: 'image/gif' } as Blob), false);
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assert.equal(isCompressible({ type: 'image/apng' } as Blob), false);
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assert.equal(isCompressible({ type: '' } as Blob), false);
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assert.equal(isCompressible({ type: 'application/pdf' } as Blob), false);
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assert.equal(isCompressible({ type: 'text/plain' } as Blob), false);
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assert.equal(isCompressible({ type: 'video/mp4' } as Blob), false);
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});
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const webpHeader = (chunk: string, flags = 0) => {
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const b = new Uint8Array(32);
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const put = (at: number, str: string) => b.set(new TextEncoder().encode(str), at);
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put(0, 'RIFF');
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put(8, 'WEBP');
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put(12, chunk);
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b[20] = flags;
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return b;
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};
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test('isAnimatedWebp: VP8X with the animation flag (#331)', () => {
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assert.equal(isAnimatedWebp(webpHeader('VP8X', 0x02)), true);
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assert.equal(isAnimatedWebp(webpHeader('VP8X', 0x10)), false, 'alpha flag only');
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assert.equal(isAnimatedWebp(webpHeader('VP8 ')), false, 'simple lossy');
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assert.equal(isAnimatedWebp(new Uint8Array(8)), false);
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});
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test('hasTransparency (#331)', () => {
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assert.equal(hasTransparency(new Uint8ClampedArray([1, 2, 3, 255, 4, 5, 6, 255])), false);
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assert.equal(hasTransparency(new Uint8ClampedArray([1, 2, 3, 255, 0, 0, 0, 0])), true);
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});
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