refactor(web): expose scaled image dimensions from AdaptiveImage

Change-Id: Iae105fb749525739ba8df5b944a73ea66a6a6964

web/src/lib/components/AdaptiveImage.svelte

@@ -74,6 +74,8 @@
     onError?: () => void;
     ref?: HTMLDivElement;
     imgRef?: HTMLImageElement;
+    imgNaturalSize?: Size;
+    imgScaledSize?: Size;
     backdrop?: Snippet;
     overlays?: Snippet;
   };
@@ -82,6 +84,10 @@
     ref = $bindable(),
     // eslint-disable-next-line no-useless-assignment
     imgRef = $bindable(),
+    // eslint-disable-next-line no-useless-assignment
+    imgNaturalSize = $bindable(),
+    // eslint-disable-next-line no-useless-assignment
+    imgScaledSize = $bindable(),
     asset,
     sharedLink,
     objectFit = 'contain',
@@ -149,10 +155,22 @@
     return { width: 1, height: 1 };
   });
 
+  $effect(() => {
+    imgNaturalSize = imageDimensions;
+  });
+
+  const scaledDimensions = $derived.by(() => {
+    const scaleFn = objectFit === 'cover' ? scaleToCover : scaleToFit;
+    return scaleFn(imageDimensions, container);
+  });
+
+  $effect(() => {
+    imgScaledSize = scaledDimensions;
+  });
+
   const { insetInlineStart, top, displayWidth, displayHeight, rasterWidth, rasterHeight, rasterScale } = $derived.by(
     () => {
-      const scaleFn = objectFit === 'cover' ? scaleToCover : scaleToFit;
-      const { width, height } = scaleFn(imageDimensions, container);
+      const { width, height } = scaledDimensions;
       if (maxRasterPixels === 0) {
         return {
           insetInlineStart: (container.width - width) / 2 + 'px',

web/src/lib/components/asset-viewer/PhotoViewer.svelte

@@ -13,7 +13,7 @@
   import { SlideshowLook, SlideshowState, slideshowStore } from '$lib/stores/slideshow.store';
   import { handlePromiseError } from '$lib/utils';
   import { canCopyImageToClipboard, copyImageToClipboard } from '$lib/utils/asset-utils';
-  import { getNaturalSize, scaleToFit, type Size } from '$lib/utils/container-utils';
+  import type { Size } from '$lib/utils/container-utils';
   import { handleError } from '$lib/utils/handle-error';
   import { getOcrBoundingBoxes } from '$lib/utils/ocr-utils';
   import { getBoundingBox, type BoundingBox } from '$lib/utils/people-utils';
@@ -67,13 +67,9 @@
     height: containerHeight,
   });
 
-  const overlaySize = $derived.by((): Size => {
-    if (!assetViewerManager.imgRef || !visibleImageReady) {
-      return { width: 0, height: 0 };
-    }
+  let scaledDimensions = $state<Size>({ width: 0, height: 0 });
 
-    return scaleToFit(getNaturalSize(assetViewerManager.imgRef), { width: containerWidth, height: containerHeight });
-  });
+  const overlaySize = $derived(visibleImageReady ? scaledDimensions : { width: 0, height: 0 });
 
   const highlightedBoxes = $derived(getBoundingBox(assetViewerManager.highlightedFaces, overlaySize));
   const isHighlighting = $derived(highlightedBoxes.length > 0);
@@ -235,6 +231,7 @@
       onReady?.();
     }}
     bind:imgRef={assetViewerManager.imgRef}
+    bind:imgScaledSize={scaledDimensions}
     bind:ref={adaptiveImage}
   >
     {#snippet backdrop()}