remove tiny-skia and replace chunk renderer with a GPU-based one

static/index.js

@@ -146,6 +146,7 @@ function readUrl(urlString) {
     }
 
     let currentUser = wall.onlineUsers.getUser(session.sessionId);
+    let chunkAllocator = canvasRenderer.atlasAllocator;
 
     // Event loop
 
@@ -214,15 +215,13 @@ function readUrl(urlString) {
                 updatePromises.push(
                     createImageBitmap(blob).then((bitmap) => {
                         let chunk = wall.mainLayer.getOrCreateChunk(
+                            chunkAllocator,
                             info.position.x,
                             info.position.y,
                         );
                         if (chunk == null) return;
 
-                        chunk.ctx.globalCompositeOperation = "copy";
-                        chunk.ctx.drawImage(bitmap, 0, 0);
-                        chunk.syncToPixmap();
-                        chunk.markModified();
+                        chunk.upload(chunkAllocator, bitmap);
                     }),
                 );
             }