Changing extent structure back to single array: [minX, minY, maxX, maxY]

This means we'll have to have a new structure and new methods for 3D envelopes.

src/ol/renderer/canvas/canvasimagelayerrenderer.js

@@ -113,8 +113,8 @@ ol.renderer.canvas.ImageLayer.prototype.renderFrame =
         1);
     goog.vec.Mat4.translate(
         transform,
-        (imageExtent[0][0] - viewCenter[0]) / imageResolution,
-        (viewCenter[1] - imageExtent[1][1]) / imageResolution,
+        (imageExtent[0] - viewCenter[0]) / imageResolution,
+        (viewCenter[1] - imageExtent[3]) / imageResolution,
         0);
 
     this.updateAttributions(frameState.attributions, image.getAttributions());

src/ol/renderer/canvas/canvastilelayerrenderer.js

@@ -348,8 +348,8 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
       for (tileCoordKey in tilesToDraw) {
         tile = tilesToDraw[tileCoordKey];
         tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
-        x = (tileExtent[0][0] - origin[0]) / tileResolution;
-        y = (origin[1] - tileExtent[1][1]) / tileResolution;
+        x = (tileExtent[0] - origin[0]) / tileResolution;
+        y = (origin[1] - tileExtent[3]) / tileResolution;
         width = scale * tileSize[0];
         height = scale * tileSize[1];
         tileState = tile.getState();

src/ol/renderer/canvas/canvasvectorlayerrenderer.js

@@ -477,10 +477,10 @@ ol.renderer.canvas.VectorLayer.prototype.renderFrame =
         tilesToRender[key] = tileCoord;
       } else if (idle) {
         tileExtent = tileGrid.getTileCoordExtent(tileCoord);
-        tileExtent[0][0] -= tileGutter;
-        tileExtent[1][0] += tileGutter;
-        tileExtent[0][1] -= tileGutter;
-        tileExtent[1][1] += tileGutter;
+        tileExtent[0] -= tileGutter;
+        tileExtent[2] += tileGutter;
+        tileExtent[1] -= tileGutter;
+        tileExtent[3] += tileGutter;
         tileHasFeatures = false;
         for (i = 0; i < numTypes; ++i) {
           type = types[i];