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import * as _ from './utils'
export class ImageData {
constructor(width: number, height: number)
constructor(width: number, height: number, settings: ImageDataSettings)
constructor(data: Uint8ClampedArray, width: number)
constructor(data: Uint8ClampedArray, width: number, height: number)
constructor(
data: Uint8ClampedArray,
width: number,
height: number,
settings: ImageDataSettings
)
constructor(
arg0: number | Uint8ClampedArray,
arg1: number,
...args: [] | [number] | [ImageDataSettings] | [number, ImageDataSettings]
) {
if (arguments.length < 2)
throw new TypeError(
`Failed to construct 'ImageData': 2 arguments required.`
)
/** Whether Uint8ClampedArray data is provided. */
const hasData = _.__object_isPrototypeOf(Uint8ClampedArray.prototype, arg0)
/** Image data, either provided or calculated. */
const d = hasData
? (arg0 as Uint8ClampedArray)
: new Uint8ClampedArray(
asNumber(arg0, 'width') * asNumber(arg1, 'height') * 4
)
/** Image width. */
const w = asNumber(hasData ? arg1 : arg0, 'width')
/** Image height. */
const h = d.length / w / 4
/** Image color space. */
const c = String(
Object(hasData ? args[1] : args[0]).colorSpace || 'srgb'
) as PredefinedColorSpace
// throw if a provided height does not match the calculated height
if (args.length && asNumber(args[0], 'height') !== h)
throw new DOMException(
'height is not equal to (4 * width * height)',
'IndexSizeError'
)
// throw if a provided colorspace does not match a known colorspace
if (c !== 'srgb' && c !== 'rec2020' && c !== 'display-p3')
throw new TypeError('colorSpace is not known value')
Object.defineProperty(this, 'data', {
configurable: true,
enumerable: true,
value: d,
})
_.INTERNALS.set(this, {
width: w,
height: h,
colorSpace: c,
} as ImageDataInternals)
}
get data(): Uint8ClampedArray {
_.internalsOf<ImageDataInternals>(this, 'ImageData', 'data')
return (
Object.getOwnPropertyDescriptor(this, 'data') as {
value: Uint8ClampedArray
}
).value
}
get width(): ImageDataInternals['width'] {
return _.internalsOf<ImageDataInternals>(this, 'ImageData', 'width').width
}
get height(): ImageDataInternals['height'] {
return _.internalsOf<ImageDataInternals>(this, 'ImageData', 'height').height
}
}
_.allowStringTag(ImageData)
/** Returns a coerced number, optionally throwing if the number is zero-ish. */
const asNumber = (value: any, axis: string): number => {
value = Number(value) || 0
if (value === 0)
throw new TypeError(`The source ${axis} is zero or not a number.`)
return value
}
interface ImageDataInternals {
colorSpace: PredefinedColorSpace
height: number
width: number
}
interface ImageDataSettings {
colorSpace?: PredefinedColorSpace
}
type PredefinedColorSpace = 'srgb' | 'rec2020' | 'display-p3'
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