1 files changed, 12 insertions, 7 deletions
diff --git a/tools/image-thumbnails-test.js b/tools/image-thumbnails-test.js
index ede7e11..6ece275 100644
--- a/tools/image-thumbnails-test.js
+++ b/tools/image-thumbnails-test.js
@@ -1,4 +1,4 @@
-// Real minified blob worker: both thumbnail sizes, animated originals,
+// Real minified blob worker: both thumbnail sizes (the tile in the picture's own shape), animated originals,
 // bounded concurrency and graceful fallback, with no page-thread encoding.
 import assert from 'node:assert/strict';
 import puppeteer from './puppeteer.js';
@@ -30,25 +30,30 @@ try {
    thumbnails(new Blob(['broken'],{type:'image/jpeg'}),{width:1100}), thumbnails(blob,{width:1100}),
   ]);
   const media = await decode(big.media), tile = await decode(big.tile);
-  const square = new OffscreenCanvas(360,360);square.getContext('2d').drawImage(tile,0,0);
-  const pixel=[...square.getContext('2d').getImageData(0,180,1,1).data];
+  const whole = new OffscreenCanvas(tile.width,tile.height);whole.getContext('2d').drawImage(tile,0,0);
+  const pixel=[...whole.getContext('2d').getImageData(tile.width>>1,180,1,1).data], edge=[...whole.getContext('2d').getImageData(2,180,1,1).data];
+  // a panorama past 2:1 keeps its middle, 2:1
+  const pano=new OffscreenCanvas(4000,1000);pano.getContext('2d').fillStyle='green';pano.getContext('2d').fillRect(0,0,4000,1000);
+  const panoTile=await decode((await thumbnails(await encode.call(pano,{type:'image/png'}),{tileSize:360})).tile);
   const smallCanvas=new OffscreenCanvas(32,20);smallCanvas.getContext('2d');
   const smallBlob=await encode.call(smallCanvas,{type:'image/png'});
   const small=await thumbnails(smallBlob,{width:1100,tileSize:360});
   const smallTile=await decode(small.tile);
   const gif=new Blob([Uint8Array.from(atob('R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7'),c=>c.charCodeAt(0))],{type:'image/gif'});
   const animated=await thumbnails(gif,{width:1100,tileSize:360});
-  const out={mainCalls,maxPending,big:[big.width,big.height],media:[media.width,media.height],tile:[tile.width,tile.height],pixel,
+  const out={mainCalls,maxPending,big:[big.width,big.height],media:[media.width,media.height],tile:[tile.width,tile.height],pixel,edge,pano:[panoTile.width,panoTile.height],
    tileOnly:!tiles.media&&!!tiles.tile,bad,recovered:!!recovered.media,smallOriginal:small.media===null,smallTile:[smallTile.width,smallTile.height],
    animated: animated && [animated.width,animated.height,animated.media,animated.tile]};
   media.close();tile.close();smallTile.close();return out;
  });
  console.log(result);
  assert.equal(result.mainCalls,0);assert.equal(result.maxPending,1);
- assert.deepEqual(result.big,[3000,2000]);assert.deepEqual(result.media,[1100,733]);assert.deepEqual(result.tile,[360,360]);
- assert(result.pixel[2]>200&&result.pixel[0]<30,'tile crops the center');
+ assert.deepEqual(result.big,[3000,2000]);assert.deepEqual(result.media,[1100,733]);assert.deepEqual(result.tile,[540,360]);
+ // the grid's justified rows: a tile in the picture's own shape, 360 tall, uncut up to 2:1
+ assert(result.pixel[2]>200&&result.pixel[0]<30&&result.edge[0]>200,'tile keeps the whole picture');
+ assert.deepEqual(result.pano,[720,360]);
  assert(result.tileOnly&&result.recovered&&result.smallOriginal);assert.equal(result.bad,null);
- assert.deepEqual(result.smallTile,[20,20]);assert.deepEqual(result.animated,[1,1,null,null]);
+ assert.deepEqual(result.smallTile,[32,20]);assert.deepEqual(result.animated,[1,1,null,null]);
  const fallback=await browser.newPage();await fallback.goto(server.url.href);await fallback.waitForFunction(()=>window.thumbnails);
  assert.equal(await fallback.evaluate(async()=>{window.Worker=class {constructor(){throw Error('blocked');}};return thumbnails(new Blob(['x']),{width:1100});}),null);
  console.log('✓ thumbnails stay off the page thread; sizes, crop, originals, queue, bad-image recovery and worker fallback pass');