Merge pull request #13712 from mike-000/tile-pyramid-getData()

Fix tile pyramid getData()

src/ol/renderer/webgl/TileLayer.js

@@ -18,7 +18,12 @@ import {
   scale as scaleTransform,
   translate as translateTransform,
 } from '../../transform.js';
-import {containsCoordinate, getIntersection, isEmpty} from '../../extent.js';
+import {
+  boundingExtent,
+  containsCoordinate,
+  getIntersection,
+  isEmpty,
+} from '../../extent.js';
 import {
   create as createMat4,
   fromTransform as mat4FromTransform,
@@ -713,16 +718,28 @@ class WebGLTileLayerRenderer extends WebGLLayerRenderer {
       }
     }
 
-    const source = layer.getRenderSource();
-    const tileGrid = source.getTileGridForProjection(viewState.projection);
-    if (!source.getWrapX()) {
-      const gridExtent = tileGrid.getExtent();
-      if (gridExtent) {
-        if (!containsCoordinate(gridExtent, coordinate)) {
-          return null;
+    // determine last source suitable for rendering at coordinate
+    const sources = layer.getSources(
+      boundingExtent([coordinate]),
+      viewState.resolution
+    );
+    let i, source, tileGrid;
+    for (i = sources.length - 1; i >= 0; --i) {
+      source = sources[i];
+      if (source.getState() === State.READY) {
+        tileGrid = source.getTileGridForProjection(viewState.projection);
+        if (source.getWrapX()) {
+          break;
+        }
+        const gridExtent = tileGrid.getExtent();
+        if (!gridExtent || containsCoordinate(gridExtent, coordinate)) {
+          break;
         }
       }
     }
+    if (i < 0) {
+      return null;
+    }
 
     const tileTextureCache = this.tileTextureCache_;
     for (

src/ol/source.js

@@ -43,7 +43,7 @@ export {default as Zoomify} from './source/Zoomify.js';
  * This function takes a {@link module:ol/tilecoord~TileCoord} as argument and is expected to return a
  * {@link module:ol/source/Source~Source}. **Note**: The returned sources should have a tile grid with
  * a limited set of resolutions, matching the resolution range of a single zoom level of the pyramid
- * `tileGrid` that `createFromTileGrid` was called with.
+ * `tileGrid` that `sourcesFromTileGrid` was called with.
  * @return {function(import("./extent.js").Extent, number): Array<import("./source/Source.js").default>} Sources function.
  * @api
  */

test/browser/spec/ol/layer/WebGLTile.test.js

@@ -8,6 +8,7 @@ import {createCanvasContext2D} from '../../../../../src/ol/dom.js';
 import {createXYZ} from '../../../../../src/ol/tilegrid.js';
 import {getForViewAndSize} from '../../../../../src/ol/extent.js';
 import {getRenderPixel} from '../../../../../src/ol/render.js';
+import {sourcesFromTileGrid} from '../../../../../src/ol/source.js';
 
 describe('ol/layer/WebGLTile', function () {
   /** @type {WebGLTileLayer} */
@@ -105,6 +106,62 @@ describe('ol/layer/WebGLTile', function () {
       });
     });
 
+    it('retrieves pixel data from pyramid', (done) => {
+      const pyramidGrid = createXYZ({minZoom: 1, maxZoom: 1});
+      const layer = new WebGLTileLayer({
+        sources: sourcesFromTileGrid(
+          pyramidGrid,
+          ([z1, x1, y1]) =>
+            new DataTileSource({
+              tileSize: 1,
+              tileGrid: createXYZ({
+                extent: pyramidGrid.getTileCoordExtent([z1, x1, y1]),
+                minZoom: 1,
+                maxZoom: 1,
+              }),
+              loader(z2, x2, y2) {
+                return new Uint8Array([x1, y1, x2, y2]);
+              },
+            })
+        ),
+      });
+
+      map.addLayer(layer);
+
+      map.once('rendercomplete', () => {
+        let data;
+        data = layer.getData([25, 25]);
+        expect(data).to.be.a(Uint8Array);
+        expect(data.length).to.be(4);
+        expect(data[0]).to.be(0);
+        expect(data[1]).to.be(0);
+        expect(data[2]).to.be(1);
+        expect(data[3]).to.be(1);
+        data = layer.getData([75, 25]);
+        expect(data).to.be.a(Uint8Array);
+        expect(data.length).to.be(4);
+        expect(data[0]).to.be(1);
+        expect(data[1]).to.be(0);
+        expect(data[2]).to.be(0);
+        expect(data[3]).to.be(1);
+        data = layer.getData([25, 75]);
+        expect(data).to.be.a(Uint8Array);
+        expect(data.length).to.be(4);
+        expect(data[0]).to.be(0);
+        expect(data[1]).to.be(1);
+        expect(data[2]).to.be(1);
+        expect(data[3]).to.be(0);
+        data = layer.getData([75, 75]);
+        expect(data).to.be.a(Uint8Array);
+        expect(data.length).to.be(4);
+        expect(data[0]).to.be(1);
+        expect(data[1]).to.be(1);
+        expect(data[2]).to.be(0);
+        expect(data[3]).to.be(0);
+        done();
+      });
+    });
+
     it('preserves the original data type', (done) => {
       const layer = new WebGLTileLayer({
         source: new DataTileSource({