mirror of
https://github.com/NASAWorldWind/WebWorldWind.git
synced 2026-01-25 15:23:04 +00:00
89 lines
3.5 KiB
JavaScript
89 lines
3.5 KiB
JavaScript
/*
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* Copyright 2003-2006, 2009, 2017, 2020 United States Government, as represented
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* by the Administrator of the National Aeronautics and Space Administration.
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* All rights reserved.
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*
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* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License,
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* Version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License
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* at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*
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* NASAWorldWind/WebWorldWind also contains the following 3rd party Open Source
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* software:
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*
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* ES6-Promise – under MIT License
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* libtess.js – SGI Free Software License B
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* Proj4 – under MIT License
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* JSZip – under MIT License
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*
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* A complete listing of 3rd Party software notices and licenses included in
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* WebWorldWind can be found in the WebWorldWind 3rd-party notices and licenses
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* PDF found in code directory.
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*/
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// Set RGBA values for a pixel
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function setPixel(imageData, x, y, r, g, b, a) {
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var index = (x + y * imageData.width) * 4;
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imageData.data[index + 0] = r;
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imageData.data[index + 1] = g;
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imageData.data[index + 2] = b;
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imageData.data[index + 3] = a;
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}
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// Set ImageData for the canvas
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function setImageData(dataArray, imageData, colorPaletteArray, regionName, filename, noDataValue) {
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var newDataArray = [];
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for (var rowNo = 0; rowNo < dataArray.length; rowNo++) {
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var col = dataArray[rowNo].trim().split(' ');
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if (col.length > 1) {
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for (var colNo = 0; colNo < col.length; colNo++) {
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newDataArray.push(col[colNo]);
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var r, g, b, a;
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if (col[colNo] === noDataValue || col[colNo] === 255) {
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r = colorPaletteArray[2] * 255;
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g = colorPaletteArray[3] * 255;
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b = colorPaletteArray[4] * 255;
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a = colorPaletteArray[5] * 255;
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setPixel(imageData, colNo, rowNo, r, g, b, a);
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}
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else {
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for (var k = 0; k < colorPaletteArray.length; k += 6) {
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if (col[colNo] >= colorPaletteArray[k] && col[colNo] <= colorPaletteArray[k + 1]) {
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r = colorPaletteArray[k + 2] * 255;
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g = colorPaletteArray[k + 3] * 255;
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b = colorPaletteArray[k + 4] * 255;
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a = colorPaletteArray[k + 5] * 255;
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setPixel(imageData, colNo, rowNo, r, g, b, a);
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break;
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}
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}
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}
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}
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}
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}
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self.postMessage(
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{
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'imageData': imageData,
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'regionName': regionName,
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'filename': filename,
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'dataArray': newDataArray
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});
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imageData = null;
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}
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self.onmessage = function (e) {
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var imageData = e.data.imageData;
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var dataArray = e.data.dataArray;
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var colorPaletteArray = e.data.colorPaletteArray;
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var regionName = e.data.regionName;
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var filename = e.data.filename;
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var noDataValue = e.data.noDataValue;
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setImageData(dataArray, imageData, colorPaletteArray, regionName, filename, noDataValue);
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}; |