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favicon_service.js
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favicon_service.js
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const createFaviconService = () => {
const favicons = []
const faviconWidth = 128
const faviconHeight = 128
const badgeRadius = 32
const initFaviconService = () => {
const nodes = document.querySelectorAll('link[rel="icon"]')
nodes.forEach(favicon => {
if (favicon) {
const favcanvas = document.createElement('canvas')
favcanvas.width = faviconWidth
favcanvas.height = faviconHeight
const favimg = new Image()
favimg.crossOrigin = 'anonymous'
favimg.src = favicon.href
const favcontext = favcanvas.getContext('2d')
favicons.push({ favcanvas, favimg, favcontext, favicon })
}
})
}
const isImageLoaded = (img) => img.complete && img.naturalHeight !== 0
const clearFaviconBadge = () => {
if (favicons.length === 0) return
favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {
if (!favimg || !favcontext || !favicon) return
favcontext.clearRect(0, 0, faviconWidth, faviconHeight)
if (isImageLoaded(favimg)) {
favcontext.drawImage(favimg, 0, 0, favimg.width, favimg.height, 0, 0, faviconWidth, faviconHeight)
}
favicon.href = favcanvas.toDataURL('image/png')
})
}
const drawFaviconBadge = () => {
if (favicons.length === 0) return
clearFaviconBadge()
favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {
if (!favimg || !favcontext || !favcontext) return
const style = getComputedStyle(document.body)
const badgeColor = `${style.getPropertyValue('--badgeNotification') || 'rgb(240, 100, 100)'}`
if (isImageLoaded(favimg)) {
favcontext.drawImage(favimg, 0, 0, favimg.width, favimg.height, 0, 0, faviconWidth, faviconHeight)
}
favcontext.fillStyle = badgeColor
favcontext.beginPath()
favcontext.arc(faviconWidth - badgeRadius, badgeRadius, badgeRadius, 0, 2 * Math.PI, false)
favcontext.fill()
favicon.href = favcanvas.toDataURL('image/png')
})
}
return {
initFaviconService,
clearFaviconBadge,
drawFaviconBadge
}
}
const FaviconService = createFaviconService()
export default FaviconService

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favicon_service.js (2 KB)

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