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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | 24x 24x 24x 24x 24x 24x 24x 24x 24x | import computeAutoVoi from './computeAutoVoi';
import lutMatches from './lutMatches';
import generateLut from './generateLut';
import { IImage, CPUFallbackViewport } from '../../../../types';
/**
* Retrieve or generate a LUT Array for an Image and Viewport
*
* @param {Image} image An Image Object
* @param {Viewport} viewport An Viewport Object
* @param {Boolean} invalidated Whether or not the LUT data has been invalidated
* (e.g. by a change to the windowWidth, windowCenter, or invert viewport parameters).
* @return {Uint8ClampedArray} LUT Array
* @memberof rendering
*/
export default function (
image: IImage,
viewport: CPUFallbackViewport,
invalidated: boolean
): Uint8ClampedArray {
// If we have a cached lut and it has the right values, return it immediately
Iif (
image.cachedLut !== undefined &&
image.cachedLut.windowCenter === viewport.voi.windowCenter &&
image.cachedLut.windowWidth === viewport.voi.windowWidth &&
lutMatches(image.cachedLut.modalityLUT, viewport.modalityLUT) &&
lutMatches(image.cachedLut.voiLUT, viewport.voiLUT) &&
image.cachedLut.invert === viewport.invert &&
invalidated !== true
) {
return image.cachedLut.lutArray;
}
computeAutoVoi(viewport, image);
// Lut is invalid or not present, regenerate it and cache it
generateLut(
image,
viewport.voi.windowWidth,
viewport.voi.windowCenter,
viewport.invert,
viewport.modalityLUT,
viewport.voiLUT
);
image.cachedLut.windowWidth = viewport.voi.windowWidth;
image.cachedLut.windowCenter = viewport.voi.windowCenter;
image.cachedLut.invert = viewport.invert;
image.cachedLut.voiLUT = viewport.voiLUT;
image.cachedLut.modalityLUT = viewport.modalityLUT;
return image.cachedLut.lutArray;
}
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