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john-okeefe
016b93d987
Ensures browsers use highest-quality interpolation when scaling raster comic book images during zoom. No effect on browsers that don't support this value (they fall back to default bilinear).
46 lines
1.8 KiB
JavaScript
46 lines
1.8 KiB
JavaScript
export const makeComicBook = ({ entries, loadBlob, getSize }, file) => {
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const cache = new Map()
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const urls = new Map()
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const load = async name => {
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if (cache.has(name)) return cache.get(name)
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const src = URL.createObjectURL(await loadBlob(name))
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const page = URL.createObjectURL(
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new Blob([`<!DOCTYPE html><html><head><meta charset="utf-8"></head><body style="margin: 0"><img src="${src}" style="image-rendering: high-quality"></body></html>`], { type: 'text/html' }))
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urls.set(name, [src, page])
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cache.set(name, page)
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return page
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}
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const unload = name => {
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urls.get(name)?.forEach?.(url => URL.revokeObjectURL(url))
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urls.delete(name)
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cache.delete(name)
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}
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const exts = ['.jpg', '.jpeg', '.png', '.gif', '.bmp', '.webp', '.svg', '.jxl', '.avif']
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const files = entries
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.map(entry => entry.filename)
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.filter(name => exts.some(ext => name.endsWith(ext)))
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.sort(new Intl.Collator([], { numeric: true }).compare)
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if (!files.length) throw new Error('No supported image files in archive')
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const book = {}
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book.getCover = () => loadBlob(files[0])
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book.metadata = { title: file.name }
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book.sections = files.map(name => ({
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id: name,
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load: () => load(name),
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unload: () => unload(name),
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size: getSize(name),
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}))
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book.toc = files.map(name => ({ label: name, href: name }))
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book.rendition = { layout: 'pre-paginated' }
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book.resolveHref = href => ({ index: book.sections.findIndex(s => s.id === href) })
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book.splitTOCHref = href => [href, null]
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book.getTOCFragment = doc => doc.documentElement
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book.destroy = () => {
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for (const arr of urls.values())
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for (const url of arr) URL.revokeObjectURL(url)
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}
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return book
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}
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