fix(core): restore drawing buffer sync for attached GL contexts on resize

modules/core/src/lib/deck-picker.ts

@@ -186,10 +186,10 @@ export default class DeckPicker {
       }
     }
 
-    // Resize it to current canvas size (this is a noop if size hasn't changed)
-    const {canvas} = this.device.getDefaultCanvasContext();
-    this.pickingFBO?.resize({width: canvas.width, height: canvas.height});
-    this.depthFBO?.resize({width: canvas.width, height: canvas.height});
+    // Picking buffers must track the active drawing buffer, not raw canvas element dimensions.
+    const [width, height] = this.device.getDefaultCanvasContext().getDrawingBufferSize();
+    this.pickingFBO?.resize({width, height});
+    this.depthFBO?.resize({width, height});
   }
 
   /** Preliminary filtering of the layers list. Skid picking pass if no layer is pickable. */
@@ -223,8 +223,9 @@ export default class DeckPicker {
     result: PickingInfo[];
     emptyInfo: PickingInfo;
   }> {
-    // @ts-expect-error TODO - assuming WebGL context
-    const pixelRatio = this.device.canvasContext.cssToDeviceRatio();
+    const canvasContext = this.device.getDefaultCanvasContext();
+    // Picking starts in CSS pixels, so use the canvas context's current conversion ratio.
+    const pixelRatio = canvasContext.cssToDeviceRatio();
 
     const pickableLayers = this._getPickable(layers);
 
@@ -239,9 +240,8 @@ export default class DeckPicker {
 
     // Convert from canvas top-left to WebGL bottom-left coordinates
     // Top-left coordinates [x, y] to bottom-left coordinates [deviceX, deviceY]
-    // And compensate for pixelRatio
-    // @ts-expect-error TODO - assuming WebGL context
-    const devicePixelRange = this.device.canvasContext.cssToDevicePixels([x, y], true);
+    // And compensate for the context's current CSS-to-device ratio.
+    const devicePixelRange = canvasContext.cssToDevicePixels([x, y], true);
     const devicePixel = [
       devicePixelRange.x + Math.floor(devicePixelRange.width / 2),
       devicePixelRange.y + Math.floor(devicePixelRange.height / 2)
@@ -387,8 +387,9 @@ export default class DeckPicker {
     result: PickingInfo[];
     emptyInfo: PickingInfo;
   } {
-    // @ts-expect-error TODO - assuming WebGL context
-    const pixelRatio = this.device.canvasContext.cssToDeviceRatio();
+    const canvasContext = this.device.getDefaultCanvasContext();
+    // Keep the sync picking path aligned with the same canvas context state used for drawing.
+    const pixelRatio = canvasContext.cssToDeviceRatio();
 
     const pickableLayers = this._getPickable(layers);
 
@@ -403,9 +404,8 @@ export default class DeckPicker {
 
     // Convert from canvas top-left to WebGL bottom-left coordinates
     // Top-left coordinates [x, y] to bottom-left coordinates [deviceX, deviceY]
-    // And compensate for pixelRatio
-    // @ts-expect-error TODO - assuming WebGL context
-    const devicePixelRange = this.device.canvasContext.cssToDevicePixels([x, y], true);
+    // And compensate for the context's current CSS-to-device ratio.
+    const devicePixelRange = canvasContext.cssToDevicePixels([x, y], true);
     const devicePixel = [
       devicePixelRange.x + Math.floor(devicePixelRange.width / 2),
       devicePixelRange.y + Math.floor(devicePixelRange.height / 2)
@@ -556,19 +556,17 @@ export default class DeckPicker {
     this._resizeBuffer();
 
     // Convert from canvas top-left to WebGL bottom-left coordinates
-    // And compensate for pixelRatio
-    // @ts-expect-error TODO - assuming WebGL context
-    const pixelRatio = this.device.canvasContext.cssToDeviceRatio();
-    // @ts-expect-error TODO - assuming WebGL context
-    const leftTop = this.device.canvasContext.cssToDevicePixels([x, y], true);
+    // And compensate for the context's current CSS-to-device ratio.
+    const canvasContext = this.device.getDefaultCanvasContext();
+    const pixelRatio = canvasContext.cssToDeviceRatio();
+    const leftTop = canvasContext.cssToDevicePixels([x, y], true);
 
     // take left and top (y inverted in device pixels) from start location
     const deviceLeft = leftTop.x;
     const deviceTop = leftTop.y + leftTop.height;
 
     // take right and bottom (y inverted in device pixels) from end location
-    // @ts-expect-error TODO - assuming WebGL context
-    const rightBottom = this.device.canvasContext.cssToDevicePixels([x + width, y + height], true);
+    const rightBottom = canvasContext.cssToDevicePixels([x + width, y + height], true);
     const deviceRight = rightBottom.x + rightBottom.width;
     const deviceBottom = rightBottom.y;
 
@@ -663,19 +661,17 @@ export default class DeckPicker {
     this._resizeBuffer();
 
     // Convert from canvas top-left to WebGL bottom-left coordinates
-    // And compensate for pixelRatio
-    // @ts-expect-error TODO - assuming WebGL context
-    const pixelRatio = this.device.canvasContext.cssToDeviceRatio();
-    // @ts-expect-error TODO - assuming WebGL context
-    const leftTop = this.device.canvasContext.cssToDevicePixels([x, y], true);
+    // And compensate for the context's current CSS-to-device ratio.
+    const canvasContext = this.device.getDefaultCanvasContext();
+    const pixelRatio = canvasContext.cssToDeviceRatio();
+    const leftTop = canvasContext.cssToDevicePixels([x, y], true);
 
     // take left and top (y inverted in device pixels) from start location
     const deviceLeft = leftTop.x;
     const deviceTop = leftTop.y + leftTop.height;
 
     // take right and bottom (y inverted in device pixels) from end location
-    // @ts-expect-error TODO - assuming WebGL context
-    const rightBottom = this.device.canvasContext.cssToDevicePixels([x + width, y + height], true);
+    const rightBottom = canvasContext.cssToDevicePixels([x + width, y + height], true);
     const deviceRight = rightBottom.x + rightBottom.width;
     const deviceBottom = rightBottom.y;
 

modules/core/src/lib/deck.ts

@@ -346,6 +346,7 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
   private _metricsCounter: number = 0;
   private _hoverPickSequence: number = 0;
   private _pointerDownPickSequence: number = 0;
+  private _pollCanvasContextSize: boolean = false;
 
   private _needsRedraw: false | string = 'Initial render';
   private _pickRequest: {
@@ -386,6 +387,9 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
     // See if we already have a device
     if (props.device) {
       this.device = props.device;
+      // External Device ownership means Deck cannot wrap luma's onResize callback.
+      // Keep a render-loop poll so viewport dimensions still follow CanvasContext state.
+      this._pollCanvasContextSize = true;
     }
 
     let deviceOrPromise: Device | Promise<Device> | null = this.device;
@@ -405,11 +409,10 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
         _cachePipelines: true,
         ...this.props.deviceProps,
         onResize: (canvasContext, info) => {
-          // Sync drawing buffer dimensions with externally-managed canvas
+          // autoResize is disabled for attached contexts — sync the drawing buffer manually.
           const {width, height} = canvasContext.canvas;
           canvasContext.setDrawingBufferSize(width, height);
-
-          this._needsRedraw = 'Canvas resized';
+          this._onCanvasContextResize(canvasContext);
           userOnResize?.(canvasContext, info);
         }
       });
@@ -1054,15 +1057,22 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
     }
   }
 
-  /** If canvas size has changed, reads out the new size and update */
-  private _updateCanvasSize(): void {
+  /**
+   * Sync Deck viewport dimensions from the active canvas context.
+   * luma.gl owns resize observation, DPR tracking and drawing buffer sizing.
+   */
+  private _updateCanvasSize(
+    canvasContext: {
+      getCSSSize(): [number, number];
+    } | null = this.device?.getDefaultCanvasContext?.() || null
+  ): void {
     const {canvas} = this;
-    if (!canvas) {
-      return;
-    }
-    // Fallback to width/height when clientWidth/clientHeight are undefined (OffscreenCanvas).
-    const newWidth = canvas.clientWidth ?? canvas.width;
-    const newHeight = canvas.clientHeight ?? canvas.height;
+    const [newWidth, newHeight] = canvasContext
+      ? // The canvas context owns the authoritative CSS size after resize/DPR observation.
+        canvasContext.getCSSSize()
+      : // Fallback to width/height when there is no default canvas context available yet.
+        [canvas?.clientWidth ?? canvas?.width ?? 0, canvas?.clientHeight ?? canvas?.height ?? 0];
+
     if (newWidth !== this.width || newHeight !== this.height) {
       // @ts-expect-error private assign to read-only property
       this.width = newWidth;
@@ -1075,6 +1085,12 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
     }
   }
 
+  private _onCanvasContextResize(canvasContext: {getCSSSize(): [number, number]}): void {
+    // luma owns resize detection; Deck reacts by invalidating redraw and updating view state.
+    this._needsRedraw = 'Canvas resized';
+    this._updateCanvasSize(canvasContext);
+  }
+
   private _createAnimationLoop(
     deviceOrPromise: Device | Promise<Device>,
     props: DeckProps<ViewsT>
@@ -1149,10 +1165,9 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
         autoResize: true
       },
       onResize: (canvasContext, info) => {
-        // Set redraw flag when luma.gl's CanvasContext detects a resize
-        // This restores pre-9.2 behavior where resize automatically triggered redraws
-        this._needsRedraw = 'Canvas resized';
-        // Call user's onResize if provided
+        // Deck-created canvases follow the same contract as attached canvases:
+        // luma updates canvas state, Deck updates viewport bookkeeping and callbacks.
+        this._onCanvasContextResize(canvasContext);
         userOnResize?.(canvasContext, info);
       }
     });
@@ -1383,7 +1398,8 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
 
     this.setProps(this.props);
 
-    this._updateCanvasSize();
+    // Seed the initial Deck width/height from the current canvas context before onLoad fires.
+    this._updateCanvasSize(this.device.getDefaultCanvasContext());
     this.props.onLoad();
   }
 
@@ -1447,7 +1463,12 @@ export default class Deck<ViewsT extends ViewOrViews = null> {
       }
     }
 
-    this._updateCanvasSize();
+    if (this._pollCanvasContextSize) {
+      // Callers that hand Deck an existing Device keep luma's CanvasContext as the source
+      // of truth, but Deck does not own that context's onResize wiring. Poll the context
+      // once per frame so width/height stay in sync without falling back to DOM reads.
+      this._updateCanvasSize();
+    }
 
     this._updateCursor();
 

modules/google-maps/src/utils.ts

@@ -46,7 +46,8 @@ export function createDeckInstance(
 
   const newDeck = new Deck({
     ...props,
-    // Default to true for high-DPI displays, but allow user override
+    // The basemap owns the shared canvas in interleaved mode; Deck only forwards the preferred DPR.
+    // In non-interleaved mode this still feeds the luma canvas context that Deck creates.
     useDevicePixels: props.useDevicePixels ?? true,
     style: props.interleaved ? null : {pointerEvents: 'none'},
     parent: getContainer(overlay, props.style),

modules/mapbox/src/deck-utils.ts

@@ -51,8 +51,9 @@ export function getDeckInstance({
   };
   deckProps.views ||= getDefaultView(map);
 
-  // deck is using the WebGLContext created by mapbox,
-  // block deck from setting the canvas size, and use the map's viewState to drive deck.
+  // deck is using the WebGLContext created by mapbox.
+  // The map and its attached luma canvas context own canvas sizing and DPR state here.
+  // Deck only follows view state and avoids trying to size the shared canvas itself.
   Object.assign(deckProps, {
     width: null,
     height: null,

test/modules/core/lib/deck.spec.ts

@@ -134,6 +134,110 @@ test('Deck#abort', async () => {
   console.log('Deck initialization aborted');
 });
 
+test('Deck#canvas context resize drives Deck dimensions', async () => {
+  const resizeEvents: Array<{width: number; height: number}> = [];
+  const deck = new Deck({
+    device,
+    width: 1,
+    height: 1,
+    viewState: {longitude: 0, latitude: 0, zoom: 0},
+    layers: [],
+    onResize: dimensions => resizeEvents.push(dimensions)
+  });
+
+  await waitForRender(deck);
+
+  const canvasContext = device.getDefaultCanvasContext();
+  const originalGetCSSSize = canvasContext.getCSSSize.bind(canvasContext);
+  const nextSize: [number, number] = [17, 19];
+
+  try {
+    canvasContext.getCSSSize = () => nextSize;
+    resizeEvents.length = 0;
+
+    // Call the internal resize hook directly so the test verifies Deck's reaction to luma state.
+    // @ts-expect-error testing private resize hook
+    deck._onCanvasContextResize(canvasContext);
+
+    expect(deck.width, 'Deck width comes from canvas context CSS size').toBe(nextSize[0]);
+    expect(deck.height, 'Deck height comes from canvas context CSS size').toBe(nextSize[1]);
+    expect(resizeEvents, 'Deck onResize fires from canvas context resize').toEqual([
+      {width: nextSize[0], height: nextSize[1]}
+    ]);
+    expect(deck.needsRedraw(), 'resize invalidates redraw').toBeTruthy();
+  } finally {
+    canvasContext.getCSSSize = originalGetCSSSize;
+    deck.finalize();
+  }
+});
+
+test('Deck#useDevicePixels forwards to canvas context', async () => {
+  const deck = new Deck({
+    device,
+    width: 1,
+    height: 1,
+    viewState: {longitude: 0, latitude: 0, zoom: 0},
+    layers: []
+  });
+
+  await waitForRender(deck);
+
+  const canvasContext = device.getDefaultCanvasContext();
+  const initialUseDevicePixels = canvasContext.props.useDevicePixels;
+
+  try {
+    // Deck.setProps should only forward the preference into luma's canvas context.
+    deck.setProps({useDevicePixels: false});
+    expect(canvasContext.props.useDevicePixels, 'canvas context useDevicePixels updated').toBe(
+      false
+    );
+
+    // Numeric overrides should flow through unchanged so luma can size the drawing buffer.
+    deck.setProps({useDevicePixels: 2});
+    expect(canvasContext.props.useDevicePixels, 'numeric DPR override is forwarded').toBe(2);
+  } finally {
+    canvasContext.setProps({useDevicePixels: initialUseDevicePixels});
+    deck.finalize();
+  }
+});
+
+test('Deck#render frame syncs provided device canvas context size', async () => {
+  const resizeEvents: Array<{width: number; height: number}> = [];
+  const deck = new Deck({
+    device,
+    width: 1,
+    height: 1,
+    viewState: {longitude: 0, latitude: 0, zoom: 0},
+    layers: [],
+    onResize: dimensions => resizeEvents.push(dimensions)
+  });
+
+  await waitForRender(deck);
+
+  const canvasContext = device.getDefaultCanvasContext();
+  const originalGetCSSSize = canvasContext.getCSSSize.bind(canvasContext);
+  const nextSize: [number, number] = [23, 29];
+
+  try {
+    canvasContext.getCSSSize = () => nextSize;
+    resizeEvents.length = 0;
+
+    // Provided Device instances do not route luma's onResize callback through Deck.
+    // The render loop still refreshes dimensions from CanvasContext so view state stays current.
+    // @ts-expect-error testing private render loop
+    deck._onRenderFrame();
+
+    expect(deck.width, 'Deck width is refreshed during render frame').toBe(nextSize[0]);
+    expect(deck.height, 'Deck height is refreshed during render frame').toBe(nextSize[1]);
+    expect(resizeEvents, 'Deck onResize fires from render-frame canvas context sync').toEqual([
+      {width: nextSize[0], height: nextSize[1]}
+    ]);
+  } finally {
+    canvasContext.getCSSSize = originalGetCSSSize;
+    deck.finalize();
+  }
+});
+
 test('Deck#no views', async () => {
   await new Promise<void>((resolve, reject) => {
     const deck = new Deck({