scrivito/src/scrivito_sdk/app_support/decode/get_css_canvas_context.ts

Scrivito is a professional, yet easy to use SaaS Enterprise Content Management Service, built for digital agencies and medium to large businesses. It is completely maintenance-free, cost-effective, and has unprecedented performance and security.

// @rewire
// currently only supported in safari
export function getCSSCanvasContext(
  contextType: '2d',
  identifier: string,
  width: number,
  height: number
): CanvasRenderingContext2D {
  if (!documentGetCSSCanvasContext()) {
    throw new Error('Browser does not support getCSSCanvasContext!');
  }

  return documentGetCSSCanvasContext()(contextType, identifier, width, height);
}

export function clearGetCSSCanvasContext(identifier: string): void {
  getCSSCanvasContext('2d', identifier, 0, 0);
}

export function hasGetCSSCanvasContext(): boolean {
  return !!documentGetCSSCanvasContext();
}

// For test purpose only
export function documentGetCSSCanvasContext() {
  return (
    (document as DocumentWithGetCSSCanvasContext).getCSSCanvasContext &&
    (document as DocumentWithGetCSSCanvasContext).getCSSCanvasContext.bind(
      document
    )
  );
}

interface DocumentWithGetCSSCanvasContext extends Document {
  getCSSCanvasContext(
    contextType: '2d',
    identifier: string,
    width: number,
    height: number
  ): CanvasRenderingContext2D;
}