Compress UV Editor output to avoid 413 Payload Too Large limits on external reverse proxies

src/components/UVEditor.tsx

@@ -26,8 +26,6 @@ interface UVEditorProps {
   sceneObjects?: any[];
 }
 
-const CANVAS_SIZE = 1024;
-
 function deg2rad(d: number) { return d * Math.PI / 180; }
 
 export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObjects }: UVEditorProps) {
@@ -50,6 +48,8 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
   useEffect(() => {
     const saved = targetObject?.materialProps?.uvLayers;
     if (saved?.length) {
+      setCanvasW(1024);
+      setCanvasH(1024);
       let n = 0;
       const init: Layer[] = saved.map((l: any) => ({ ...l }));
       init.forEach(layer => {
@@ -64,16 +64,27 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
       const img = new Image();
       img.crossOrigin = "anonymous";
       img.onload = () => {
-        // Automatically scale the image so it fits the 1024x1024 canvas exactly
-        const scaleX = CANVAS_SIZE / img.width;
-        const scaleY = CANVAS_SIZE / img.height;
+        // Reduced MAX size from 2048 to 1024 to prevent huge base64 strings
+        // that trigger the 1MB Nginx reverse proxy 413 Payload Too Large limit.
+        const MAX = 1024;
+        let scale = 1;
+        if (img.width > MAX || img.height > MAX) {
+          scale = MAX / Math.max(img.width, img.height);
+        }
+        const cw = Math.round(img.width * scale);
+        const ch = Math.round(img.height * scale);
+        setCanvasW(cw);
+        setCanvasH(ch);
+        
+        const scaleX = cw / img.width;
+        const scaleY = ch / img.height;
 
         const layer: Layer = {
           id: `l-base`,
           url,
           img,
-          x: CANVAS_SIZE / 2,
-          y: CANVAS_SIZE / 2,
+          x: cw / 2,
+          y: ch / 2,
           scaleX,
           scaleY,
           rotation: 0,
@@ -109,12 +120,14 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
       ctx.restore();
     });
     try {
-      return c.toDataURL(transparent ? 'image/png' : 'image/jpeg');
+      // Use JPEG with 0.75 quality to heavily compress the image size
+      // to avoid hitting the 1MB Nginx reverse proxy limit.
+      return c.toDataURL(transparent ? 'image/png' : 'image/jpeg', 0.75);
     } catch (e) {
       console.error("Canvas render error (likely CORS taint):", e);
       return "";
     }
-  }, []);
+  }, [canvasW, canvasH]);
 
   useEffect(() => {
     setPreviewUrl(renderCanvas(layers, bgTransparent, bgColor));