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81 lines
3.0 KiB
JavaScript
81 lines
3.0 KiB
JavaScript
import * as utils from './radar-utils.mjs';
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const fetchAsBlob = async (url) => {
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const response = await fetch(url);
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return response.blob();
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};
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onmessage = async (e) => {
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const baseMapImage = createImageBitmap(await fetchAsBlob('/images/maps/radar.webp'));
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const {
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url, index, RADAR_HOST, OVERRIDES, radarSourceXY, sourceXY, offsetX, offsetY,
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} = e.data;
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// calculate offsets and sizes
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const width = 2550;
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const height = 1600;
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const radarOffsetX = 120;
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const radarOffsetY = 70;
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const radarSourceX = Math.round(radarSourceXY.x / 2);
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const radarSourceY = Math.round(radarSourceXY.y / 2);
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// create destination context
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const baseCanvas = new OffscreenCanvas(640, 367);
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const baseContext = baseCanvas.getContext('2d', { alpha: false });
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baseContext.imageSmoothingEnabled = false;
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// create working context for manipulation
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const radarCanvas = new OffscreenCanvas(width, height);
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const radarContext = radarCanvas.getContext('2d', { alpha: false });
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radarContext.imageSmoothingEnabled = false;
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// get the image
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const modifiedUrl = OVERRIDES.RADAR_HOST ? url.replace(RADAR_HOST, OVERRIDES.RADAR_HOST) : url;
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console.time(`Radar-${index}-fetch`);
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const response = await fetch(modifiedUrl);
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console.timeEnd(`Radar-${index}-fetch`);
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// test response
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if (!response.ok) throw new Error(`Unable to fetch radar error ${response.status} ${response.statusText} from ${response.url}`);
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// get the blob
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console.time(`Radar-${index}-blob`);
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const radarImgBlob = await response.blob();
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console.timeEnd(`Radar-${index}-blob`);
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// assign to an html image element
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console.time(`Radar-${index}-loadimg-element`);
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const radarImgElement = await createImageBitmap(radarImgBlob);
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console.timeEnd(`Radar-${index}-loadimg-element`);
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// draw the entire image
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radarContext.clearRect(0, 0, width, 1600);
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console.time(`Radar-${index}-drawimage`);
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radarContext.drawImage(radarImgElement, 0, 0, width, 1600);
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console.timeEnd(`Radar-${index}-drawimage`);
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// get the base map
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console.time(`Radar-${index}-drawbasemap`);
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baseContext.drawImage(await baseMapImage, sourceXY.x, sourceXY.y, offsetX * 2, offsetY * 2, 0, 0, 640, 367);
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console.timeEnd(`Radar-${index}-drawbasemap`);
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// crop the radar image
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const cropCanvas = new OffscreenCanvas(640, 367);
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const cropContext = cropCanvas.getContext('2d', { willReadFrequently: true });
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cropContext.imageSmoothingEnabled = false;
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console.time(`Radar-${index}-copy-radar`);
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cropContext.drawImage(radarCanvas, radarSourceX, radarSourceY, (radarOffsetX * 2), Math.round(radarOffsetY * 2.33), 0, 0, 640, 367);
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console.timeEnd(`Radar-${index}-copy-radar`);
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// clean the image
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console.time(`Radar-${index}-clean-image`);
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utils.removeDopplerRadarImageNoise(cropContext);
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console.timeEnd(`Radar-${index}-clean-image`);
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// merge the radar and map
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console.time(`Radar-${index}-merge`);
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utils.mergeDopplerRadarImage(baseContext, cropContext);
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console.timeEnd(`Radar-${index}-merge`);
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const processedRadar = baseCanvas.transferToImageBitmap();
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postMessage(processedRadar, [processedRadar]);
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};
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