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/**
*
* @copyright Copyright (c) 2020, Daniel Calviño Sánchez (danxuliu@gmail.com)
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
const fileReaderSync = new global.FileReaderSync()
onmessage = function(message) {
const offscreenCanvas = new OffscreenCanvas(message.data.width, message.data.height)
const context = offscreenCanvas.getContext('2d')
context.filter = `blur(${message.data.blurRadius}px)`
context.drawImage(message.data.image, 0, 0, offscreenCanvas.width, offscreenCanvas.height)
offscreenCanvas.convertToBlob().then(blob => {
postMessage({
id: message.data.id,
blurredImageAsDataUrl: fileReaderSync.readAsDataURL(blob),
})
})
}
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