import { adaptDPI } from "@thi.ng/adapt-dpi" ; export type CanvasContext = CanvasRenderingContext2D | WebGLRenderingContext | WebGL2RenderingContext ; interface Canvas2DContextAttributes { alpha ? : boolean ; storage ? : boolean ; willReadFrequently ? : boolean ; [ attribute ] : boolean | string | undefined ; } /**
 * User provided canvas life cycle methods. These differ from the usual
 *  {@link @thi.ng/hdom#ILifecycle} methods and are always passed at
 * least the canvas DOM element, canvas context and hdom user context.
 * Not all handlers need to be implemented.
  export interface CanvasHandlers < T extends CanvasContext > { /**
     * User init handler (called only once when canvas first)
     */ init ( el , ctx , hctx , ... args ) : void ; /**
     * Update handler (called for each hdom update iteration)
     */ update ( el , ctx , hctx , time , frame , ... args ) : void ; /**
     * release handler (called only once when canvas element is removed
     * from DOM)
     */ release ( el , ctx , hctx , ... args ) : void ; } /**
 * Configurable canvas component. Used as common base for  canvasWebGL * and  canvas2D wrappers.
 *
 *  param type param handlers param opts const _canvas = ( type , handlers , opts ) => { let el ; let ctx ; let frame = 0 ; let time = 0 ; return { init ( _el , hctx , ... args ) { el = _el ; adaptDPI ( el , el . width , el . height ) ; ctx = el . getContext ( type , opts ) ; time = Date . now ( ) ; handlers . init && handlers . init ( el , ctx , hctx , ... args ) ; handlers . update && handlers . update ( el , ctx , hctx , time , frame ++ , ... args ) ; } , render ( hctx , ... args ) { ctx && handlers . update && handlers . update ( el , ctx , hctx , Date . now ( ) - time , frame ++ , ... args ) ; return [ "canvas" , args [ 0 ] ] ; } , release ( hctx , ... args ) { handlers . release && handlers . release ( el , ctx , hctx , ... args ) ; } , } ; } ; remarks example param handlers param opts export const canvasWebGL = ( handlers , opts ? ) => _canvas ( "webgl" , handlers , opts ) ; /**
 * Same as  canvasWebGL but targets WebGL2.
 *
 *  param handlers param opts export const canvasWebGL2 = ( handlers , opts ? ) => _canvas ( "webgl2" , handlers , opts ) ; /**
 * Similar to  canvasWebGL , but targets default 2D drawing context.
 *
 *  param handlers param glopts export const canvas2D = ( handlers , opts ? ) => _canvas ( "2d" , handlers , opts ) ;