import defined from "../Core/defined.js";
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import destroyObject from "../Core/destroyObject.js";
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import ImageryState from "./ImageryState.js";
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/**
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* Stores details about a tile of imagery.
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*
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* @alias Imagery
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* @private
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*/
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function Imagery(imageryLayer, x, y, level, rectangle) {
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this.imageryLayer = imageryLayer;
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this.x = x;
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this.y = y;
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this.level = level;
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this.request = undefined;
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if (level !== 0) {
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var parentX = (x / 2) | 0;
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var parentY = (y / 2) | 0;
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var parentLevel = level - 1;
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this.parent = imageryLayer.getImageryFromCache(
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parentX,
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parentY,
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parentLevel
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);
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}
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this.state = ImageryState.UNLOADED;
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this.imageUrl = undefined;
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this.image = undefined;
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this.texture = undefined;
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this.textureWebMercator = undefined;
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this.credits = undefined;
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this.referenceCount = 0;
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if (!defined(rectangle) && imageryLayer.imageryProvider.ready) {
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var tilingScheme = imageryLayer.imageryProvider.tilingScheme;
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rectangle = tilingScheme.tileXYToRectangle(x, y, level);
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}
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this.rectangle = rectangle;
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}
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Imagery.createPlaceholder = function (imageryLayer) {
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var result = new Imagery(imageryLayer, 0, 0, 0);
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result.addReference();
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result.state = ImageryState.PLACEHOLDER;
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return result;
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};
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Imagery.prototype.addReference = function () {
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++this.referenceCount;
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};
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Imagery.prototype.releaseReference = function () {
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--this.referenceCount;
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if (this.referenceCount === 0) {
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this.imageryLayer.removeImageryFromCache(this);
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if (defined(this.parent)) {
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this.parent.releaseReference();
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}
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if (defined(this.image) && defined(this.image.destroy)) {
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this.image.destroy();
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}
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if (defined(this.texture)) {
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this.texture.destroy();
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}
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if (
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defined(this.textureWebMercator) &&
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this.texture !== this.textureWebMercator
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) {
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this.textureWebMercator.destroy();
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}
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destroyObject(this);
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return 0;
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}
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return this.referenceCount;
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};
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Imagery.prototype.processStateMachine = function (
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frameState,
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needGeographicProjection,
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skipLoading
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) {
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if (this.state === ImageryState.UNLOADED && !skipLoading) {
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this.state = ImageryState.TRANSITIONING;
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this.imageryLayer._requestImagery(this);
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}
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if (this.state === ImageryState.RECEIVED) {
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this.state = ImageryState.TRANSITIONING;
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this.imageryLayer._createTexture(frameState.context, this);
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}
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// If the imagery is already ready, but we need a geographic version and don't have it yet,
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// we still need to do the reprojection step. This can happen if the Web Mercator version
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// is fine initially, but the geographic one is needed later.
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var needsReprojection =
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this.state === ImageryState.READY &&
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needGeographicProjection &&
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!this.texture;
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if (this.state === ImageryState.TEXTURE_LOADED || needsReprojection) {
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this.state = ImageryState.TRANSITIONING;
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this.imageryLayer._reprojectTexture(
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frameState,
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this,
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needGeographicProjection
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);
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}
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};
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export default Imagery;
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