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feat(image-import): add compressImage with canvas resize + JPEG re-encode

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Kenearos 2026-05-12 00:13:57 +02:00
parent f7e8ccb5b6
commit d8a3e9de86
3 changed files with 98 additions and 0 deletions
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46
test-suite.js
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@ -527,6 +527,52 @@ runner.test('Storage API Key: clearAll laesst API-Key unberuehrt', (t) => {
storage.clearApiKey();
});
// ============================================================================
// ImageImporter Tests - Preprocessing (Feature A)
// ============================================================================
/**
* Helper: build a synthetic image File from a canvas.
*/
async function makeTestImageFile(width, height, mime = 'image/png') {
const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext('2d');
ctx.fillStyle = '#3366cc';
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = '#ffffff';
ctx.font = '32px sans-serif';
ctx.fillText('TEST', 20, 50);
const blob = await new Promise(res => canvas.toBlob(res, mime));
return new File([blob], 'test.png', { type: mime });
}
runner.test('Preprocess: 4000x3000 wird auf laengste Kante 2048 skaliert', async (t) => {
const importer = new ImageImporter(null);
const file = await makeTestImageFile(4000, 3000);
const result = await importer.compressImage(file);
t.assertEqual(result.width, 2048, 'Breite sollte 2048 sein');
t.assertEqual(result.height, 1536, 'Hoehe sollte 1536 sein (Seitenverhaeltnis erhalten)');
t.assertTrue(result.dataUrl.startsWith('data:image/jpeg;base64,'), 'dataUrl-Prefix korrekt');
});
runner.test('Preprocess: 800x600 bleibt unveraendert (kein Upscale)', async (t) => {
const importer = new ImageImporter(null);
const file = await makeTestImageFile(800, 600);
const result = await importer.compressImage(file);
t.assertEqual(result.width, 800, 'Breite unveraendert');
t.assertEqual(result.height, 600, 'Hoehe unveraendert');
});
runner.test('Preprocess: Output ist immer JPEG', async (t) => {
const importer = new ImageImporter(null);
const file = await makeTestImageFile(500, 500, 'image/png');
const result = await importer.compressImage(file);
t.assertTrue(result.dataUrl.startsWith('data:image/jpeg;base64,'), 'Output ist JPEG');
t.assertTrue(result.dataUrl.length > 1000, 'Output-Laenge > 1KB');
});
// ============================================================================
// Display Functions
// ============================================================================