All files / packages/core/src/RenderingEngine/helpers/cpuFallback/rendering initializeRenderCanvas.ts

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import { CPUFallbackEnabledElement, IImage } from '../../../../types';
 
/**
 * Sets size and clears canvas
 *
 * @param {Object} enabledElement Cornerstone Enabled Element
 * @param {Object} image Image to be rendered
 * @returns {void}
 * @memberof rendering
 */
export default function (
  enabledElement: CPUFallbackEnabledElement,
  image: IImage
): void {
  const renderCanvas = enabledElement.renderingTools.renderCanvas;
 
  // Resize the canvas
  renderCanvas.width = image.width;
  renderCanvas.height = image.height;
 
  const canvasContext = renderCanvas.getContext('2d');
 
  // NOTE - we need to fill the render canvas with white pixels since we
  // control the luminance using the alpha channel to improve rendering performance.
  canvasContext.fillStyle = 'white';
  canvasContext.fillRect(0, 0, renderCanvas.width, renderCanvas.height);
 
  const renderCanvasData = canvasContext.getImageData(
    0,
    0,
    image.width,
    image.height
  );
 
  enabledElement.renderingTools.renderCanvasContext = canvasContext;
  enabledElement.renderingTools.renderCanvasData = renderCanvasData;
}