77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
const createFaviconService = () => {
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const favicons = []
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const faviconWidth = 128
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const faviconHeight = 128
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const badgeRadius = 32
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const gapWidth = 24
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const initFaviconService = () => {
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const nodes = document.querySelectorAll('link[rel="icon"]')
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nodes.forEach(favicon => {
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if (favicon) {
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const favcanvas = document.createElement('canvas')
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favcanvas.width = faviconWidth
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favcanvas.height = faviconHeight
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const favimg = new Image()
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favimg.crossOrigin = 'anonymous'
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favimg.src = favicon.href
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const favcontext = favcanvas.getContext('2d')
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favicons.push({ favcanvas, favimg, favcontext, favicon })
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}
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})
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}
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const isImageLoaded = (img) => img.complete && img.naturalHeight !== 0
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const clearFaviconBadge = () => {
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if (favicons.length === 0) return
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favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {
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if (!favimg || !favcontext || !favicon) return
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favcontext.clearRect(0, 0, faviconWidth, faviconHeight)
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if (isImageLoaded(favimg)) {
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favcontext.drawImage(favimg, 0, 0, favimg.width, favimg.height, 0, 0, faviconWidth, faviconHeight)
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}
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favicon.href = favcanvas.toDataURL('image/png')
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})
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}
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const drawFaviconBadge = () => {
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if (favicons.length === 0) return
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clearFaviconBadge()
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favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {
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if (!favimg || !favcontext || !favcontext) return
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const style = getComputedStyle(document.body)
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const badgeColor = `${style.getPropertyValue('--badgeNotification') || 'rgb(240, 100, 100)'}`
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if (isImageLoaded(favimg)) {
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favcontext.drawImage(favimg, 0, 0, favimg.width, favimg.height, 0, 0, faviconWidth, faviconHeight)
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}
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// draw bigger transparent circle to create gap
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favcontext.globalCompositeOperation = 'destination-out'
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favcontext.beginPath()
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favcontext.arc(faviconWidth - badgeRadius, badgeRadius, badgeRadius + gapWidth, 0, 2 * Math.PI, false)
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favcontext.fill()
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favcontext.globalCompositeOperation = 'source-over'
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favcontext.fillStyle = badgeColor
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favcontext.beginPath()
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favcontext.arc(faviconWidth - badgeRadius, badgeRadius, badgeRadius, 0, 2 * Math.PI, false)
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favcontext.fill()
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favicon.href = favcanvas.toDataURL('image/png')
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})
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}
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return {
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initFaviconService,
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clearFaviconBadge,
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drawFaviconBadge
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}
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}
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const FaviconService = createFaviconService()
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export default FaviconService
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