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node_modules/@cesium/engine/Source/Scene/Model/ImageryCoverage.js

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+import defined from "../../Core/defined.js";
+import Rectangle from "../../Core/Rectangle.js";
+
+import CartesianRectangle from "./CartesianRectangle.js";
+
+const imageryBoundsScratch = new Rectangle();
+const overlappedRectangleScratch = new Rectangle();
+const clippedRectangleScratch = new Rectangle();
+const nativeInputRectangleScratch = new Rectangle();
+const nativeImageryBoundsScratch = new Rectangle();
+const nativeClippedImageryBoundsScratch = new Rectangle();
+
+/**
+ * A class containing information about a piece of imagery.
+ *
+ * This represents the result of computing the imagery tiles that
+ * are covered by a given <code>Rectangle</code> (and which part
+ * of that imagery is covered, in terms of texture coordinates).
+ *
+ * This class represents a plain structure, without member functions.
+ * Instances are created with the <code>createImageryCoverages</code>
+ * function.
+ *
+ * The instances are used by the <code>ModelPrimitiveImagery</code>, to
+ * represent the imagery tiles that are covered by the cartographic
+ * bounding rectangle of the primitive positions.
+ *
+ * Implementation note for ImageryCoverage:
+ *
+ * Some of the static functions in this class have been extracted from
+ * <code>ImageryLayer.prototype._createTileImagerySkeletons</code>
+ * See https://github.com/CesiumGS/cesium/blob/5eaa2280f495d8f300d9e1f0497118c97aec54c8/packages/engine/Source/Scene/ImageryLayer.js#L700
+ * An instance of this class roughly corresponds to the <code>TileImagery</code>
+ * that is created there.
+ *
+ * @private
+ */
+class ImageryCoverage {
+  /**
+   * Creates a new instance.
+   *
+   * @param {number} x x-coordinate of the imagery tile
+   * @param {number} y y-coordinate of the imagery tile
+   * @param {number} level level of the imagery tile
+   * @param {CartesianRectangle} textureCoordinateRectangle The texture coordinate
+   * rectangle from the imagery tile that is covered
+   * @param {Imagery} imagery The imagery
+   */
+  constructor(x, y, level, textureCoordinateRectangle, imagery) {
+    this._x = x;
+    this._y = y;
+    this._level = level;
+    this._textureCoordinateRectangle = textureCoordinateRectangle;
+    this._imagery = imagery;
+  }
+
+  /**
+   * The x-coordinate of the imagery tile, typically correlated with longitude
+   *
+   * @type {number}
+   * @readonly
+   */
+  get x() {
+    return this._x;
+  }
+
+  /**
+   * The y-coordinate of the imagery tile, typically correlated with latitude
+   *
+   * @type {number}
+   * @readonly
+   */
+  get y() {
+    return this._y;
+  }
+
+  /**
+   * The level of the imagery tile
+   *
+   * @type {number}
+   * @readonly
+   */
+  get level() {
+    return this._level;
+  }
+
+  /**
+   * The texture coordinate range that is covered from the
+   * imagery tile.
+   *
+   * This is a <code>CartesianRectangle</code> that contains the
+   * (minU, minV, maxU, maxV) coordinate range.
+   *
+   * Clients may not modify the returned instance.
+   *
+   * @type {CartesianRectangle}
+   * @readonly
+   */
+  get textureCoordinateRectangle() {
+    return this._textureCoordinateRectangle;
+  }
+
+  /**
+   * Returns the imagery
+   *
+   * @type {Imagery}
+   * @readonly
+   */
+  get imagery() {
+    return this._imagery;
+  }
+
+  /**
+   * Computes the <code>ImageryCoverage</code> objects that describe the imagery
+   * tiles and the respective texture coordinates that are covered by the given
+   * input rectangle in the given imagery data.
+   *
+   * The given imagery level will be clamped if necessary, to be in the valid
+   * range for the imagery provider of the given imagery layer.
+   *
+   * @param {Rectangle} inputRectangle The input rectangle (e.g. tile bounds)
+   * @param {ImageryLayer} imageryLayer The imagery layer
+   * @param {number} inputImageryLevel The level for which the imagery coverage
+   * should be computed.
+   * @returns {ImageryCoverage[]} The objects describing the covered imagery
+   * and the respective texture coordinates
+   */
+  static createImageryCoverages(
+    inputRectangle,
+    imageryLayer,
+    inputImageryLevel,
+  ) {
+    if (!imageryLayer.show) {
+      return [];
+    }
+
+    const imageryProvider = imageryLayer.imageryProvider;
+    const imageryLevel = ImageryCoverage._clampImageryLevel(
+      imageryProvider,
+      inputImageryLevel,
+    );
+
+    // Compute the range, in integer coordinates, of imagery
+    // tiles that are covered by the input rectangle
+    const imageryBounds = Rectangle.intersection(
+      imageryProvider.rectangle,
+      imageryLayer.rectangle,
+      imageryBoundsScratch,
+    );
+    const imageryTilingScheme = imageryProvider.tilingScheme;
+    const imageryRange = ImageryCoverage._computeImageryRange(
+      inputRectangle,
+      imageryBounds,
+      imageryTilingScheme,
+      imageryLevel,
+    );
+
+    // Convert the input rectangle and the imagery bounds into
+    // the native coordinate system of the tiling scheme
+    const nativeInputRectangle = nativeInputRectangleScratch;
+    imageryTilingScheme.rectangleToNativeRectangle(
+      inputRectangle,
+      nativeInputRectangle,
+    );
+    const nativeImageryBounds = nativeImageryBoundsScratch;
+    imageryTilingScheme.rectangleToNativeRectangle(
+      imageryBounds,
+      nativeImageryBounds,
+    );
+
+    // A function that returns an imagery rectangle, based on (x, y, level),
+    // clipped to the imagery bounds (or undefined if there is no intersection
+    // between the imagery rectangle and the bounds)
+    const computeClippedImageryRectangle = (x, y, level) => {
+      const localImageryRectangle = imageryTilingScheme.tileXYToRectangle(
+        x,
+        y,
+        level,
+      );
+      const localClippedImageryRectangle = Rectangle.intersection(
+        localImageryRectangle,
+        imageryBounds,
+        clippedRectangleScratch,
+      );
+      if (!defined(localClippedImageryRectangle)) {
+        return undefined;
+      }
+      const nativeClippedImageryBounds = nativeClippedImageryBoundsScratch;
+      imageryTilingScheme.rectangleToNativeRectangle(
+        localClippedImageryRectangle,
+        nativeClippedImageryBounds,
+      );
+      return nativeClippedImageryBounds;
+    };
+
+    const imageryCoverages = ImageryCoverage._computeImageryCoverages(
+      imageryLayer,
+      imageryRange,
+      imageryLevel,
+      nativeInputRectangle,
+      computeClippedImageryRectangle,
+    );
+    return imageryCoverages;
+  }
+
+  /**
+   * Validate the given imagery level against the constraints of the
+   * given imagery provider.
+   *
+   * This will clamp the given level to be in the range
+   * <code>[minimumLevel, maximumLevel)</code> that is
+   * defined by the given imagery provider (and cut off
+   * any fractional part that the input may have)
+   *
+   * @param {ImageryProvider} imageryProvider The imagery provider
+   * @param {number} imageryLevel The imagery level
+   * @returns {number} The validated level
+   */
+  static _clampImageryLevel(imageryProvider, imageryLevel) {
+    const minimumLevel = imageryProvider.minimumLevel ?? 0;
+    const maximumLevel =
+      imageryProvider.maximumLevel ?? Number.POSITIVE_INFINITY;
+    const clampedImageryLevel = Math.min(
+      maximumLevel - 1,
+      Math.max(minimumLevel, imageryLevel),
+    );
+    const validImageryLevel = Math.floor(clampedImageryLevel);
+    return validImageryLevel;
+  }
+
+  /**
+   * Compute the rectangle describing the range of imagery that is covered
+   * with the given rectangle.
+   *
+   * This will compute a rectangle with integer coordinates that describe
+   * the X/Y coordinates of the imagery that is overlapped by the given
+   * input rectangle, based on the given imagery rectangle.
+   *
+   * Extracted from _createTileImagerySkeletons.
+   *
+   * @param {Rectangle} inputRectangle The input rectangle
+   * @param {Rectangle} imageryBounds The imagery bounds
+   * @param {TilingScheme} imageryTilingScheme The tiling scheme
+   * @param {number} imageryLevel The imagery level
+   * @returns {CartesianRectangle} The rectangle
+   */
+  static _computeImageryRange(
+    inputRectangle,
+    imageryBounds,
+    imageryTilingScheme,
+    imageryLevel,
+  ) {
+    const overlappedRectangle = ImageryCoverage._computeOverlappedRectangle(
+      inputRectangle,
+      imageryBounds,
+    );
+    const northwestTileCoordinates = imageryTilingScheme.positionToTileXY(
+      Rectangle.northwest(overlappedRectangle),
+      imageryLevel,
+    );
+    const southeastTileCoordinates = imageryTilingScheme.positionToTileXY(
+      Rectangle.southeast(overlappedRectangle),
+      imageryLevel,
+    );
+
+    const result = new CartesianRectangle();
+    result.minX = northwestTileCoordinates.x;
+    result.minY = northwestTileCoordinates.y;
+    result.maxX = southeastTileCoordinates.x;
+    result.maxY = southeastTileCoordinates.y;
+
+    // As extracted from _createTileImagerySkeletons:
+    // If the southeast corner of the rectangle lies very close to the north or west side
+    // of the southeast tile, we don't actually need the southernmost or easternmost
+    // tiles.
+    // Similarly, if the northwest corner of the rectangle lies very close to the south or east side
+    // of the northwest tile, we don't actually need the northernmost or westernmost tiles.
+    // We define "very close" as being within 1/512 of the width of the tile.
+    const veryCloseX = inputRectangle.width / 512.0;
+    const veryCloseY = inputRectangle.height / 512.0;
+
+    const northwestTileRectangle = imageryTilingScheme.tileXYToRectangle(
+      result.minX,
+      result.minY,
+      imageryLevel,
+    );
+    const deltaNorth = Math.abs(
+      northwestTileRectangle.south - inputRectangle.north,
+    );
+    if (deltaNorth < veryCloseY && result.minY < result.maxY) {
+      ++result.minY;
+    }
+    const deltaWest = Math.abs(
+      northwestTileRectangle.east - inputRectangle.west,
+    );
+    if (deltaWest < veryCloseX && result.minX < result.maxX) {
+      ++result.minX;
+    }
+
+    const southeastTileRectangle = imageryTilingScheme.tileXYToRectangle(
+      result.maxX,
+      result.maxY,
+      imageryLevel,
+    );
+    const deltaSouth = Math.abs(
+      southeastTileRectangle.north - inputRectangle.south,
+    );
+    if (deltaSouth < veryCloseY && result.maxY > result.minY) {
+      --result.maxY;
+    }
+    const deltaEast = Math.abs(
+      southeastTileRectangle.west - inputRectangle.east,
+    );
+    if (deltaEast < veryCloseX && result.maxX > result.minX) {
+      --result.maxX;
+    }
+
+    return result;
+  }
+
+  /**
+   * Clamp the given input rectangle to the given clamp rectangle.
+   *
+   * If the input rectangle is completely above/below or left/right
+   * of the clamp rectangle, then the north/south or east/east
+   * if the clamp rectangle will be used in the result.
+   *
+   * @param {Rectangle} input The input rectangle
+   * @param {Rectangle} clamp The clamping rectangle
+   * @param {Rectangle} [result] The result
+   * @returns {Rectangle} The result
+   */
+  static _clampRectangle(input, clamp, result) {
+    if (!defined(result)) {
+      result = new Rectangle();
+    }
+    if (input.south >= clamp.north) {
+      result.north = result.south = clamp.north;
+    } else if (input.north <= clamp.south) {
+      result.north = result.south = clamp.south;
+    } else {
+      result.south = Math.max(input.south, clamp.south);
+      result.north = Math.min(input.north, clamp.north);
+    }
+
+    if (input.west >= clamp.east) {
+      result.west = result.east = clamp.east;
+    } else if (input.east <= clamp.west) {
+      result.west = result.east = clamp.west;
+    } else {
+      result.west = Math.max(input.west, clamp.west);
+      result.east = Math.min(input.east, clamp.east);
+    }
+    return result;
+  }
+
+  /**
+   * Compute overlap between the given input rectangle, and the given
+   * bounds that have been obtained from the imagery provider.
+   *
+   * @param {Rectangle} inputRectangle The input
+   * @param {Rectangle} imageryBounds The imagery bounds
+   * @returns {Rectangle} The rectangle
+   */
+  static _computeOverlappedRectangle(inputRectangle, imageryBounds) {
+    const overlappedRectangle = Rectangle.intersection(
+      inputRectangle,
+      imageryBounds,
+      overlappedRectangleScratch,
+    );
+    if (defined(overlappedRectangle)) {
+      return overlappedRectangle;
+    }
+    return ImageryCoverage._clampRectangle(
+      inputRectangle,
+      imageryBounds,
+      overlappedRectangleScratch,
+    );
+  }
+
+  /**
+   * Computes the <code>ImageryCoverage</code> objects that describe the imagery and
+   * the texture coordinates that are contained in the given range of
+   * imagery tile coordinates, referring to the given input rectangle.
+   *
+   * @param {ImageryLayer} imageryLayer The imagery layer
+   * @param {CartesianRectangle} imageryRange The range of imagery tile coordinates
+   * @param {number} imageryLevel The imagery level
+   * @param {Rectangle} nativeInputRectangle The input rectangle, in coordinates
+   * that are native for the tiling scheme
+   * @param {Function} computeClippedImageryRectangle A function that returns
+   * an imagery rectangle, based on (x, y, level), clipped to the imagery bounds
+   * (or undefined if there is no intersection between the imagery rectangle
+   * and the bounds)
+   * @returns {ImageryCoverage[]} The objects describing the covered imagery
+   * and the respective texture coordinates
+   */
+  static _computeImageryCoverages(
+    imageryLayer,
+    imageryRange,
+    imageryLevel,
+    nativeInputRectangle,
+    computeClippedImageryRectangle,
+  ) {
+    const imageryCoverages = [];
+
+    for (let i = imageryRange.minX; i <= imageryRange.maxX; i++) {
+      const clippedImageryRectangleU = computeClippedImageryRectangle(
+        i,
+        imageryRange.maxY,
+        imageryLevel,
+      );
+
+      if (!defined(clippedImageryRectangleU)) {
+        continue;
+      }
+
+      for (let j = imageryRange.minY; j <= imageryRange.maxY; j++) {
+        const clippedImageryRectangleV = computeClippedImageryRectangle(
+          i,
+          j,
+          imageryLevel,
+        );
+
+        if (!defined(clippedImageryRectangleV)) {
+          continue;
+        }
+
+        const textureCoordinateRectangle =
+          ImageryCoverage._localizeToCartesianRectangle(
+            clippedImageryRectangleV,
+            nativeInputRectangle,
+            undefined,
+          );
+
+        // Note: The getImageryFromCache function will create the whole "chain"
+        // of ancestor imageries, up to the root, and increases the reference
+        // counter for each of them, even though it is not called
+        // getImageryFromCacheAndCreateAllAncestorsAndAddReferences.
+        // There is currently no way to have a single imagery, because
+        // somewhere in TileImagery, the parent is assumed to be present.
+        const imagery = imageryLayer.getImageryFromCache(i, j, imageryLevel);
+        const imageryCoverage = new ImageryCoverage(
+          i,
+          j,
+          imageryLevel,
+          textureCoordinateRectangle,
+          imagery,
+        );
+        imageryCoverages.push(imageryCoverage);
+      }
+    }
+    return imageryCoverages;
+  }
+
+  /**
+   * Compute the coordinates of the first rectangle relative to the
+   * second rectangle.
+   *
+   * The result will describe the bounds of the first rectangle
+   * in coordinates that are relative to the (south,west) and
+   * (width, height) of the second rectangle. This is suitable
+   * for describing the texture coordinates of the first
+   * rectangle within the second one.
+   *
+   * The result will be stored in the given result parameter, or
+   * in a new rectangle if the result was undefined.
+   *
+   * @param {Rectangle} rectangleA The first rectangle
+   * @param {Rectangle} rectangleB The second rectangle
+   * @param {CartesianRectangle} [result] The result
+   * @returns {CartesianRectangle} The result
+   */
+  static _localizeToCartesianRectangle(rectangleA, rectangleB, result) {
+    if (!defined(result)) {
+      result = new CartesianRectangle();
+    }
+    const invX = 1.0 / rectangleB.width;
+    const invY = 1.0 / rectangleB.height;
+    result.minX = (rectangleA.west - rectangleB.west) * invX;
+    result.minY = (rectangleA.south - rectangleB.south) * invY;
+    result.maxX = (rectangleA.east - rectangleB.west) * invX;
+    result.maxY = (rectangleA.north - rectangleB.south) * invY;
+    return result;
+  }
+}
+
+export default ImageryCoverage;