Merge pull request #12466 from MoonE/get-vector-context-tile-layer

Fix getVectorContext on TileLayer with pixelRatio != 1

src/ol/render.js

@@ -88,6 +88,8 @@ export function toContext(context, opt_options) {
  * @api
  */
 export function getVectorContext(event) {
+  // canvas may be at a different pixel ratio than frameState.pixelRatio
+  const canvasPixelRatio = event.inversePixelTransform[0];
   const frameState = event.frameState;
   const transform = multiplyTransform(
     event.inversePixelTransform.slice(),
@@ -95,7 +97,7 @@ export function getVectorContext(event) {
   );
   const squaredTolerance = getSquaredTolerance(
     frameState.viewState.resolution,
-    frameState.pixelRatio
+    canvasPixelRatio
   );
   let userTransform;
   const userProjection = getUserProjection();
@@ -107,7 +109,7 @@ export function getVectorContext(event) {
   }
   return new CanvasImmediateRenderer(
     event.context,
-    frameState.pixelRatio,
+    canvasPixelRatio,
     frameState.extent,
     transform,
     frameState.viewState.rotation,

test/rendering/cases/postrender-immediate/main.js

@@ -0,0 +1,45 @@
+import {Circle, Stroke, Style} from '../../../../src/ol/style.js';
+import {Map, View} from '../../../../src/ol/index.js';
+import {Point} from '../../../../src/ol/geom.js';
+import {Tile as TileLayer} from '../../../../src/ol/layer.js';
+import {XYZ} from '../../../../src/ol/source.js';
+import {getVectorContext} from '../../../../src/ol/render.js';
+import {useGeographic} from '../../../../src/ol/proj.js';
+
+useGeographic();
+
+const center = [8.6, 50.1];
+const point = new Point(center);
+const style = new Style({
+  image: new Circle({
+    radius: 40,
+    stroke: new Stroke({
+      width: 5,
+      color: 'red',
+    }),
+  }),
+});
+
+const tileLayer = new TileLayer({
+  source: new XYZ({
+    url: '/data/tiles/satellite/{z}/{x}/{y}.jpg',
+    transition: 0,
+  }),
+});
+
+new Map({
+  layers: [tileLayer],
+  target: 'map',
+  view: new View({
+    center: center,
+    zoom: 3,
+  }),
+  pixelRatio: 2,
+});
+tileLayer.on('postrender', function (evt) {
+  const vectorContext = getVectorContext(evt);
+  vectorContext.setStyle(style);
+  vectorContext.drawGeometry(point);
+});
+
+render();