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src/components/composer/NodeGenerationComposer.tsx

@@ -22,7 +22,7 @@ function isToolSupported(tool: NodeToolType, node: WorkflowNode | null): boolean
   if (tool === "multiAngle") return Boolean(getNodeImageSource(node));
   if (tool === "highDefinition") return Boolean(node && isHighDefinitionDerivedImageNode(node.data));
   if (tool === "generationComposer") return true;
-  if (tool === "crop" || tool === "splitGrid" || tool === "outpainting" || tool === "inpainting") {
+  if (tool === "crop" || tool === "splitGrid" || tool === "outpainting" || tool === "inpainting" || tool === "annotate") {
     return Boolean(getNodeImageSource(node));
   }
   return false;

src/components/media/MediaAnnotationOverlay.tsx

@@ -59,17 +59,6 @@ const DEFAULT_TEXT_BOX_WIDTH = 180;
 const DEFAULT_TEXT_BOX_HEIGHT = 32;
 const FIXED_TEXT_FONT_SIZE = 24;
 
-function validDimensions(width: unknown, height: unknown): { width: number; height: number } | null {
-  return typeof width === "number" && typeof height === "number" && width > 0 && height > 0
-    ? { width, height }
-    : null;
-}
-
-function readImageNaturalDimensions(image: HTMLImageElement | null): { width: number; height: number } | null {
-  if (!image) return null;
-  return validDimensions(image.naturalWidth, image.naturalHeight);
-}
-
 /** 把某个 shape 从显示空间按比例映射到导出（natural）空间。 */
 function scaleShape(shape: AnnotationShape, scaleX: number, scaleY: number): AnnotationShape {
   const base = {
@@ -126,10 +115,7 @@ function buildKonvaShape(shape: AnnotationShape): Konva.Shape | null {
 }
 
 export const MediaAnnotationOverlay = forwardRef<MediaAnnotationOverlayHandle, MediaAnnotationOverlayProps>(function MediaAnnotationOverlay({
-  mediaElementRef,
   imageSource,
-  naturalWidth,
-  naturalHeight,
   annotations,
   selectedShapeId,
   currentTool,
@@ -152,19 +138,14 @@ export const MediaAnnotationOverlay = forwardRef<MediaAnnotationOverlayHandle, M
   const [currentShape, setCurrentShape] = useState<AnnotationShape | null>(null);
   const [editingTextId, setEditingTextId] = useState<string | null>(null);
   const [pendingTextPosition, setPendingTextPosition] = useState<{ x: number; y: number } | null>(null);
-  const [naturalDimensions, setNaturalDimensions] = useState<{ width: number; height: number } | null>(() =>
-    validDimensions(naturalWidth, naturalHeight)
-  );
 
-  // 加载用于回显的图片（走代理避免跨域污染），既作为 Stage 底图也用于导出。
+  // 加载底图（走代理避免跨域污染）：仅用于导出时的干净合成。回显阶段画布下方
+  // 已有节点自身的 <img>（object-cover）透出，故底图加载失败也不影响绘制。
   useEffect(() => {
     let cancelled = false;
     loadCropImage(imageSource)
       .then((image) => {
-        if (cancelled) return;
-        setDisplayImage(image);
-        const dims = readImageNaturalDimensions(image);
-        if (dims) setNaturalDimensions(dims);
+        if (!cancelled) setDisplayImage(image);
       })
       .catch(() => {
         if (!cancelled) setDisplayImage(null);
@@ -174,27 +155,18 @@ export const MediaAnnotationOverlay = forwardRef<MediaAnnotationOverlayHandle, M
     };
   }, [imageSource]);
 
-  useEffect(() => {
-    const explicit = validDimensions(naturalWidth, naturalHeight);
-    if (explicit) setNaturalDimensions(explicit);
-  }, [naturalWidth, naturalHeight]);
-
+  // 绘制面 = 媒体框本身。节点图片以 object-cover 铺满媒体框（框的尺寸由节点
+  // style 决定），故 overlay 自身的 client 矩形即绘制区，无需依赖图片自然尺寸；
+  // 自然尺寸仅在导出（exportComposite）时用于坐标换算。这样只要媒体框有布局
+  // 尺寸，canvas 就一定渲染，不会再卡在“自然尺寸未知”而空白。
   const measureBounds = useCallback((): DisplayRect | null => {
     const overlay = overlayRef.current;
-    if (!overlay || !naturalDimensions) return null;
+    if (!overlay) return null;
     const width = overlay.clientWidth;
     const height = overlay.clientHeight;
     if (width <= 0 || height <= 0) return null;
-    const scale = Math.min(width / naturalDimensions.width, height / naturalDimensions.height);
-    const displayWidth = naturalDimensions.width * scale;
-    const displayHeight = naturalDimensions.height * scale;
-    return {
-      left: (width - displayWidth) / 2,
-      top: (height - displayHeight) / 2,
-      width: displayWidth,
-      height: displayHeight,
-    };
-  }, [naturalDimensions]);
+    return { left: 0, top: 0, width, height };
+  }, []);
 
   useEffect(() => {
     const overlay = overlayRef.current;