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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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