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import {
triggerEvent,
eventTarget,
Enums,
getRenderingEngines,
getEnabledElementByViewportId,
} from '@cornerstonejs/core';
import {
SegmentationRepresentations,
Events as csToolsEvents,
} from '../../enums';
import type { SegmentationRenderedEventDetail } from '../../types/EventTypes';
import Representations from '../../enums/SegmentationRepresentations';
import { getSegmentationRepresentations } from './getSegmentationRepresentation';
import type { SegmentationRepresentation } from '../../types/SegmentationStateTypes';
import surfaceDisplay from '../../tools/displayTools/Surface/surfaceDisplay';
import contourDisplay from '../../tools/displayTools/Contour/contourDisplay';
import labelmapDisplay from '../../tools/displayTools/Labelmap/labelmapDisplay';
import { addTool } from '../../store/addTool';
import { state } from '../../store/state';
import PlanarFreehandContourSegmentationTool from '../../tools/annotation/PlanarFreehandContourSegmentationTool';
import { getToolGroupForViewport } from '../../store/ToolGroupManager';
const renderers = {
[Representations.Labelmap]: labelmapDisplay,
[Representations.Contour]: contourDisplay,
[Representations.Surface]: surfaceDisplay,
};
const planarContourToolName = PlanarFreehandContourSegmentationTool.toolName;
/**
* SegmentationRenderingEngine is a class that is responsible for rendering
* segmentations. It will render the segmentation based on the segmentation data
* and their configurations. Note: This is a Singleton class and should not be
* instantiated directly. To trigger a render for all the segmentations, you can use:
*
*/
class SegmentationRenderingEngine {
private _needsRender: Set<string> = new Set();
private _pendingRenderQueue: string[][] = [];
private _animationFrameSet = false;
private _animationFrameHandle: number | null = null;
public hasBeenDestroyed: boolean;
/**
* Renders the segmentations on the specified viewport or all viewports that has
* some sort of segmentation representation.
*
* @param viewportId - The ID of the viewport to render the segmentations on. If not provided, segmentations will be rendered on all viewports.
*/
public renderSegmentationsForViewport(viewportId?: string): void {
const viewportIds = viewportId
? [viewportId]
: this._getViewportIdsForSegmentation();
this._setViewportsToBeRenderedNextFrame(viewportIds);
}
/**
* Renders the segmentation with the specified ID.
*
* @param segmentationId - The ID of the segmentation to render.
*/
public renderSegmentation(segmentationId: string): void {
const viewportIds = this._getViewportIdsForSegmentation(segmentationId);
this._setViewportsToBeRenderedNextFrame(viewportIds);
}
_getAllViewports = () => {
const renderingEngine = getRenderingEngines();
return renderingEngine.flatMap((renderingEngine) =>
renderingEngine.getViewports()
);
};
_getViewportIdsForSegmentation(segmentationId?: string): string[] {
const viewports = this._getAllViewports();
const viewportIds = [];
for (const viewport of viewports) {
const viewportId = viewport.id;
if (segmentationId) {
const segmentationRepresentations = getSegmentationRepresentations(
viewportId,
{ segmentationId }
);
if (segmentationRepresentations?.length > 0) {
viewportIds.push(viewportId);
}
} else {
const segmentationRepresentations =
getSegmentationRepresentations(viewportId);
Eif (segmentationRepresentations?.length > 0) {
viewportIds.push(viewportId);
}
}
}
return viewportIds;
}
/**
* _throwIfDestroyed Throws an error if trying to interact with the `RenderingEngine`
* instance after its `destroy` method has been called.
*/
private _throwIfDestroyed() {
Iif (this.hasBeenDestroyed) {
throw new Error(
'this.destroy() has been manually called to free up memory, can not longer use this instance. Instead make a new one.'
);
}
}
private _setViewportsToBeRenderedNextFrame(viewportIds: string[]) {
if (this._animationFrameSet) {
// If a render is already scheduled, queue this set for after the current one
this._pendingRenderQueue.push(viewportIds);
return;
}
// Add the viewports to the set of flagged viewports
viewportIds.forEach((viewportId) => {
this._needsRender.add(viewportId);
});
// Render any flagged viewports
this._render();
}
/**
* _render Sets up animation frame if necessary
*/
private _render() {
// If we have segmentations that need rendering and we have not already
// set the RAF callback to run on the next frame.
if (this._needsRender.size > 0 && this._animationFrameSet === false) {
this._animationFrameHandle = window.requestAnimationFrame(
this._renderFlaggedSegmentations
);
// Set the flag that we have already set up the next RAF call.
this._animationFrameSet = true;
}
}
private _renderFlaggedSegmentations = () => {
this._throwIfDestroyed();
const viewportIds = Array.from(this._needsRender);
viewportIds.forEach((viewportId) => {
this._triggerRender(viewportId);
});
// Clear the set of flagged segmentations
this._needsRender.clear();
// Allow RAF to be called again
this._animationFrameSet = false;
this._animationFrameHandle = null;
// If there are pending viewportId sets, schedule the next one
if (this._pendingRenderQueue.length > 0) {
const nextViewportIds = this._pendingRenderQueue.shift();
Eif (nextViewportIds && nextViewportIds.length > 0) {
this._setViewportsToBeRenderedNextFrame(nextViewportIds);
}
}
};
_triggerRender(viewportId?: string) {
const segmentationRepresentations =
getSegmentationRepresentations(viewportId);
if (!segmentationRepresentations?.length) {
return;
}
const { viewport } = getEnabledElementByViewportId(viewportId) || {};
Iif (!viewport) {
return;
}
const viewportRenderList = [];
// Render each segmentationData, in each viewport
const segmentationRenderList = segmentationRepresentations.map(
(representation: SegmentationRepresentation) => {
if (representation.type === SegmentationRepresentations.Contour) {
// if the representation is contour we need to make sure
// that the planarFreeHandTool is added
this._addPlanarFreeHandToolIfAbsent(viewport);
}
const display = renderers[representation.type];
try {
// @ts-ignore
const viewportId = display.render(viewport, representation);
viewportRenderList.push(viewportId);
} catch (error) {
console.error(error);
}
return Promise.resolve({
segmentationId: representation.segmentationId,
type: representation.type,
});
}
);
Promise.allSettled(segmentationRenderList).then((results) => {
const segmentationDetails = results
.filter((r) => r.status === 'fulfilled')
.map((r) => r.value);
function onSegmentationRender(evt: Types.EventTypes.ImageRenderedEvent) {
const { element, viewportId } = evt.detail;
element.removeEventListener(
Enums.Events.IMAGE_RENDERED,
onSegmentationRender as EventListener
);
segmentationDetails.forEach((detail) => {
const eventDetail: SegmentationRenderedEventDetail = {
viewportId,
segmentationId: detail.segmentationId,
type: detail.type,
};
triggerEvent(eventTarget, csToolsEvents.SEGMENTATION_RENDERED, {
...eventDetail,
});
});
}
// For all viewports, trigger a re-render
const element = viewport.element;
element.addEventListener(
Enums.Events.IMAGE_RENDERED,
onSegmentationRender as EventListener
);
// Render the viewport
viewport.render();
});
}
_addPlanarFreeHandToolIfAbsent(viewport) {
// if it is contour we should check if the cornerstoneTools have the planarFreeHandTool added
if (!(planarContourToolName in state.tools)) {
addTool(PlanarFreehandContourSegmentationTool);
}
const toolGroup = getToolGroupForViewport(viewport.id);
// check if toolGroup has this tool
if (!toolGroup.hasTool(planarContourToolName)) {
toolGroup.addTool(planarContourToolName);
toolGroup.setToolPassive(planarContourToolName);
}
}
}
/**
* It triggers segmentation render for the given viewportIds
*/
function triggerSegmentationRender(viewportId?: string): void {
segmentationRenderingEngine.renderSegmentationsForViewport(viewportId);
}
/**
* It triggers segmentation render for the given segmentationId
*/
function triggerSegmentationRenderBySegmentationId(
segmentationId?: string
): void {
segmentationRenderingEngine.renderSegmentation(segmentationId);
}
const segmentationRenderingEngine = new SegmentationRenderingEngine();
export {
triggerSegmentationRender,
triggerSegmentationRenderBySegmentationId,
segmentationRenderingEngine,
};
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