333 lines
10 KiB
JavaScript
333 lines
10 KiB
JavaScript
goog.provide('ol.renderer.webgl.ImageLayer');
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goog.require('ol');
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goog.require('ol.LayerType');
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goog.require('ol.ViewHint');
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goog.require('ol.dom');
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goog.require('ol.extent');
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goog.require('ol.functions');
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goog.require('ol.renderer.Type');
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goog.require('ol.renderer.webgl.Layer');
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goog.require('ol.source.ImageVector');
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goog.require('ol.transform');
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goog.require('ol.webgl');
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goog.require('ol.webgl.Context');
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/**
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* @constructor
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* @extends {ol.renderer.webgl.Layer}
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* @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
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* @param {ol.layer.Image} imageLayer Tile layer.
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* @api
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*/
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ol.renderer.webgl.ImageLayer = function(mapRenderer, imageLayer) {
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ol.renderer.webgl.Layer.call(this, mapRenderer, imageLayer);
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/**
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* The last rendered image.
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* @private
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* @type {?ol.ImageBase}
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*/
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this.image_ = null;
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/**
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* @private
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* @type {CanvasRenderingContext2D}
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*/
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this.hitCanvasContext_ = null;
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/**
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* @private
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* @type {?ol.Transform}
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*/
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this.hitTransformationMatrix_ = null;
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};
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ol.inherits(ol.renderer.webgl.ImageLayer, ol.renderer.webgl.Layer);
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/**
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* Determine if this renderer handles the provided layer.
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* @param {ol.renderer.Type} type The renderer type.
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* @param {ol.layer.Layer} layer The candidate layer.
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* @return {boolean} The renderer can render the layer.
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*/
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ol.renderer.webgl.ImageLayer['handles'] = function(type, layer) {
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return type === ol.renderer.Type.WEBGL && layer.getType() === ol.LayerType.IMAGE;
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};
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/**
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* Create a layer renderer.
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* @param {ol.renderer.Map} mapRenderer The map renderer.
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* @param {ol.layer.Layer} layer The layer to be rendererd.
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* @return {ol.renderer.webgl.ImageLayer} The layer renderer.
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*/
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ol.renderer.webgl.ImageLayer['create'] = function(mapRenderer, layer) {
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return new ol.renderer.webgl.ImageLayer(
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/** @type {ol.renderer.webgl.Map} */ (mapRenderer),
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/** @type {ol.layer.Image} */ (layer)
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);
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};
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/**
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* @param {ol.ImageBase} image Image.
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* @private
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* @return {WebGLTexture} Texture.
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*/
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ol.renderer.webgl.ImageLayer.prototype.createTexture_ = function(image) {
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// We meet the conditions to work with non-power of two textures.
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// http://www.khronos.org/webgl/wiki/WebGL_and_OpenGL_Differences#Non-Power_of_Two_Texture_Support
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// http://learningwebgl.com/blog/?p=2101
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var imageElement = image.getImage();
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var gl = this.mapRenderer.getGL();
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return ol.webgl.Context.createTexture(
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gl, imageElement, ol.webgl.CLAMP_TO_EDGE, ol.webgl.CLAMP_TO_EDGE);
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.ImageLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, hitTolerance, callback, thisArg) {
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var layer = this.getLayer();
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var source = layer.getSource();
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var resolution = frameState.viewState.resolution;
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var rotation = frameState.viewState.rotation;
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var skippedFeatureUids = frameState.skippedFeatureUids;
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return source.forEachFeatureAtCoordinate(
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coordinate, resolution, rotation, hitTolerance, skippedFeatureUids,
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/**
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* @param {ol.Feature|ol.render.Feature} feature Feature.
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* @return {?} Callback result.
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*/
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function(feature) {
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return callback.call(thisArg, feature, layer);
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});
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.ImageLayer.prototype.prepareFrame = function(frameState, layerState, context) {
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var gl = this.mapRenderer.getGL();
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var pixelRatio = frameState.pixelRatio;
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var viewState = frameState.viewState;
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var viewCenter = viewState.center;
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var viewResolution = viewState.resolution;
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var viewRotation = viewState.rotation;
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var image = this.image_;
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var texture = this.texture;
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var imageLayer = /** @type {ol.layer.Image} */ (this.getLayer());
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var imageSource = imageLayer.getSource();
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var hints = frameState.viewHints;
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var renderedExtent = frameState.extent;
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if (layerState.extent !== undefined) {
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renderedExtent = ol.extent.getIntersection(
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renderedExtent, layerState.extent);
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}
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if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
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!ol.extent.isEmpty(renderedExtent)) {
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var projection = viewState.projection;
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if (!ol.ENABLE_RASTER_REPROJECTION) {
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var sourceProjection = imageSource.getProjection();
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if (sourceProjection) {
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projection = sourceProjection;
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}
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}
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var image_ = imageSource.getImage(renderedExtent, viewResolution,
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pixelRatio, projection);
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if (image_) {
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var loaded = this.loadImage(image_);
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if (loaded) {
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image = image_;
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texture = this.createTexture_(image_);
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if (this.texture) {
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/**
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* @param {WebGLRenderingContext} gl GL.
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* @param {WebGLTexture} texture Texture.
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*/
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var postRenderFunction = function(gl, texture) {
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if (!gl.isContextLost()) {
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gl.deleteTexture(texture);
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}
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}.bind(null, gl, this.texture);
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frameState.postRenderFunctions.push(
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/** @type {ol.PostRenderFunction} */ (postRenderFunction)
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);
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}
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}
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}
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}
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if (image) {
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var canvas = this.mapRenderer.getContext().getCanvas();
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this.updateProjectionMatrix_(canvas.width, canvas.height,
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pixelRatio, viewCenter, viewResolution, viewRotation,
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image.getExtent());
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this.hitTransformationMatrix_ = null;
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// Translate and scale to flip the Y coord.
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var texCoordMatrix = this.texCoordMatrix;
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ol.transform.reset(texCoordMatrix);
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ol.transform.scale(texCoordMatrix, 1, -1);
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ol.transform.translate(texCoordMatrix, 0, -1);
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this.image_ = image;
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this.texture = texture;
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this.updateLogos(frameState, imageSource);
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}
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return !!image;
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};
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/**
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* @param {number} canvasWidth Canvas width.
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* @param {number} canvasHeight Canvas height.
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* @param {number} pixelRatio Pixel ratio.
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* @param {ol.Coordinate} viewCenter View center.
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* @param {number} viewResolution View resolution.
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* @param {number} viewRotation View rotation.
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* @param {ol.Extent} imageExtent Image extent.
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* @private
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*/
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ol.renderer.webgl.ImageLayer.prototype.updateProjectionMatrix_ = function(canvasWidth, canvasHeight, pixelRatio,
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viewCenter, viewResolution, viewRotation, imageExtent) {
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var canvasExtentWidth = canvasWidth * viewResolution;
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var canvasExtentHeight = canvasHeight * viewResolution;
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var projectionMatrix = this.projectionMatrix;
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ol.transform.reset(projectionMatrix);
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ol.transform.scale(projectionMatrix,
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pixelRatio * 2 / canvasExtentWidth,
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pixelRatio * 2 / canvasExtentHeight);
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ol.transform.rotate(projectionMatrix, -viewRotation);
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ol.transform.translate(projectionMatrix,
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imageExtent[0] - viewCenter[0],
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imageExtent[1] - viewCenter[1]);
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ol.transform.scale(projectionMatrix,
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(imageExtent[2] - imageExtent[0]) / 2,
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(imageExtent[3] - imageExtent[1]) / 2);
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ol.transform.translate(projectionMatrix, 1, 1);
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.ImageLayer.prototype.hasFeatureAtCoordinate = function(coordinate, frameState) {
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var hasFeature = this.forEachFeatureAtCoordinate(
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coordinate, frameState, 0, ol.functions.TRUE, this);
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return hasFeature !== undefined;
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};
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/**
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* @inheritDoc
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*/
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ol.renderer.webgl.ImageLayer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
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if (!this.image_ || !this.image_.getImage()) {
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return undefined;
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}
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if (this.getLayer().getSource() instanceof ol.source.ImageVector) {
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// for ImageVector sources use the original hit-detection logic,
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// so that for example also transparent polygons are detected
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var coordinate = ol.transform.apply(
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frameState.pixelToCoordinateTransform, pixel.slice());
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var hasFeature = this.forEachFeatureAtCoordinate(
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coordinate, frameState, 0, ol.functions.TRUE, this);
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if (hasFeature) {
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return callback.call(thisArg, this.getLayer(), null);
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} else {
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return undefined;
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}
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} else {
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var imageSize =
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[this.image_.getImage().width, this.image_.getImage().height];
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if (!this.hitTransformationMatrix_) {
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this.hitTransformationMatrix_ = this.getHitTransformationMatrix_(
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frameState.size, imageSize);
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}
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var pixelOnFrameBuffer = ol.transform.apply(
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this.hitTransformationMatrix_, pixel.slice());
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if (pixelOnFrameBuffer[0] < 0 || pixelOnFrameBuffer[0] > imageSize[0] ||
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pixelOnFrameBuffer[1] < 0 || pixelOnFrameBuffer[1] > imageSize[1]) {
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// outside the image, no need to check
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return undefined;
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}
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if (!this.hitCanvasContext_) {
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this.hitCanvasContext_ = ol.dom.createCanvasContext2D(1, 1);
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}
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this.hitCanvasContext_.clearRect(0, 0, 1, 1);
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this.hitCanvasContext_.drawImage(this.image_.getImage(),
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pixelOnFrameBuffer[0], pixelOnFrameBuffer[1], 1, 1, 0, 0, 1, 1);
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var imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;
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if (imageData[3] > 0) {
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return callback.call(thisArg, this.getLayer(), imageData);
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} else {
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return undefined;
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}
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}
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};
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/**
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* The transformation matrix to get the pixel on the image for a
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* pixel on the map.
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* @param {ol.Size} mapSize The map size.
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* @param {ol.Size} imageSize The image size.
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* @return {ol.Transform} The transformation matrix.
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* @private
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*/
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ol.renderer.webgl.ImageLayer.prototype.getHitTransformationMatrix_ = function(mapSize, imageSize) {
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// the first matrix takes a map pixel, flips the y-axis and scales to
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// a range between -1 ... 1
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var mapCoordTransform = ol.transform.create();
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ol.transform.translate(mapCoordTransform, -1, -1);
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ol.transform.scale(mapCoordTransform, 2 / mapSize[0], 2 / mapSize[1]);
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ol.transform.translate(mapCoordTransform, 0, mapSize[1]);
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ol.transform.scale(mapCoordTransform, 1, -1);
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// the second matrix is the inverse of the projection matrix used in the
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// shader for drawing
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var projectionMatrixInv = ol.transform.invert(this.projectionMatrix.slice());
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// the third matrix scales to the image dimensions and flips the y-axis again
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var transform = ol.transform.create();
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ol.transform.translate(transform, 0, imageSize[1]);
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ol.transform.scale(transform, 1, -1);
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ol.transform.scale(transform, imageSize[0] / 2, imageSize[1] / 2);
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ol.transform.translate(transform, 1, 1);
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ol.transform.multiply(transform, projectionMatrixInv);
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ol.transform.multiply(transform, mapCoordTransform);
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return transform;
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};
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