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import type vtkImageResliceMapper from '@kitware/vtk.js/Rendering/Core/ImageResliceMapper';
import type vtkImageSlice from '@kitware/vtk.js/Rendering/Core/ImageSlice';
import type { ColormapPublic, VOIRange } from '../../../types';
import { createPlanarRGBTransferFunction } from '../../helpers/planarImageRendering';
import type { PlanarDataPresentation } from './PlanarViewportTypes';
import {
mapBlendModeToSlabType,
resolveSlabThickness,
} from './planarVolumeSliceBlendMode';
export function applyPlanarVolumePresentation(args: {
actor: vtkImageSlice;
mapper: vtkImageResliceMapper;
defaultVOIRange?: VOIRange;
props?: PlanarDataPresentation;
}): void {
const { actor, defaultVOIRange, mapper, props } = args;
const property = actor.getProperty();
const voiRange = props?.voiRange ?? defaultVOIRange;
actor.setVisibility(props?.visible === false ? false : true);
if (props?.interpolationType !== undefined) {
property.setInterpolationType(
props.interpolationType as Parameters<
typeof property.setInterpolationType
>[0]
);
}
if (props?.blendMode !== undefined) {
const slabType = mapBlendModeToSlabType(props.blendMode);
if (slabType !== undefined) {
mapper.setSlabType(slabType);
}
}
mapper.setSlabThickness(resolveSlabThickness(props?.slabThickness));
if (props?.opacity !== undefined) {
applyVolumeOpacity({
actor,
opacity: props.opacity,
voiRange,
});
}
if (!voiRange) {
return;
}
const transferFunction = createPlanarRGBTransferFunction({
colormap: props?.colormap,
invert: props?.invert,
voiRange,
});
property.setUseLookupTableScalarRange(true);
property.setRGBTransferFunction(0, transferFunction);
applyColormapOpacity({
actor,
colormap: props?.colormap,
voiRange,
});
}
function applyVolumeOpacity(args: {
actor: vtkImageSlice;
opacity: number;
voiRange?: VOIRange;
}): void {
const { actor, opacity, voiRange } = args;
if (getVolumeNumberOfComponents(actor) < 2) {
actor.getProperty().setOpacity(opacity);
return;
}
const opacityFunction = vtkPiecewiseFunction.newInstance();
const range = resolveVolumeOpacityRange(actor, voiRange);
opacityFunction.addPoint(range.lower, opacity);
if (range.upper > range.lower) {
opacityFunction.addPoint(range.upper, opacity);
}
actor.getProperty().setScalarOpacity(0, opacityFunction);
}
function applyColormapOpacity(args: {
actor: vtkImageSlice;
colormap?: ColormapPublic;
voiRange?: VOIRange;
}): void {
const { actor, colormap, voiRange } = args;
if (!colormap) {
return;
}
if (colormap.opacity === undefined && colormap.threshold === undefined) {
return;
}
// A `threshold` is an ABSOLUTE scalar value (SUV / pixel value) spanning the
// full voxel data range, matching the legacy volume path
// (updateOpacityWithThreshold, which clamps to voxelManager.getRange()) and
// OHIF's ThresholdMenu (slider bounds = voxel range). An opacity ARRAY's
// normalized [0,1] values instead map over the VOI range (round-2 fusion
// behavior). Pick the domain accordingly so a threshold of e.g. 15 SUV is not
// clamped to a narrow VOI upper (which made everything transparent).
const range =
colormap.threshold !== undefined
? (getActorScalarRange(actor) ??
resolveVolumeOpacityRange(actor, voiRange))
: resolveVolumeOpacityRange(actor, voiRange);
const opacityFunction = vtkPiecewiseFunction.newInstance();
const points = buildColormapOpacityPoints({
colormap,
range,
fallbackOpacity: getCurrentMaxOpacity(actor),
});
points.forEach(([value, opacity]) => {
opacityFunction.addPoint(value, opacity);
});
actor.getProperty().setScalarOpacity(0, opacityFunction);
}
function buildColormapOpacityPoints(args: {
colormap: ColormapPublic;
range: VOIRange;
fallbackOpacity: number;
}): Array<[number, number]> {
const { colormap, range, fallbackOpacity } = args;
const span = range.upper - range.lower;
const delta = Math.max(Math.abs(span) * 0.001, 1e-3);
// An opacity ARRAY's `value`s (OpacityMapping.value) are normalized [0,1]
// fractions of the VOI range (see ColormapPublic docs: the minimum value maps
// to 0 opacity and the maximum value to 1 opacity). Map them onto the actual
// scalar range so an overlay opacity array (e.g. a PT/CT fusion colormap)
// attenuates by scalar value like the numeric opacity path (applyVolumeOpacity),
// which already spans the VOI range. Without this the points land at raw scalars
// (0.1 -> 0.1 SUV), making essentially all tissue opaque and hiding the
// underlying source slice in a fusion.
const toScalar = (normalized: number) => range.lower + normalized * span;
// `colormap.threshold`, by contrast, is an ABSOLUTE scalar value (SUV / pixel
// value): the legacy volume path (updateOpacityWithThreshold) clamps it straight
// to the voxel range, and OHIF's ThresholdMenu emits values in pixel units. So
// it is clamped to the range directly, NOT passed through toScalar.
const threshold =
colormap.threshold !== undefined
? Math.max(range.lower, Math.min(range.upper, colormap.threshold))
: undefined;
if (Array.isArray(colormap.opacity) && colormap.opacity.length) {
const sortedPoints = colormap.opacity
.map(({ opacity, value }) => ({
opacity: clampToUnit(opacity),
value: toScalar(value),
}))
.sort((a, b) => a.value - b.value);
if (threshold === undefined) {
return dedupeOpacityPoints(
sortedPoints.map(({ value, opacity }) => [value, opacity])
);
}
const thresholdOpacity = resolvePointOpacityAtValue(
threshold,
sortedPoints,
fallbackOpacity
);
const points: Array<[number, number]> = [
[range.lower, 0],
[Math.max(range.lower, threshold - delta), 0],
[threshold, thresholdOpacity],
];
sortedPoints.forEach(({ value, opacity }) => {
if (value > threshold) {
points.push([value, opacity]);
}
});
if (threshold < range.upper) {
const lastOpacity = points[points.length - 1][1];
if (points[points.length - 1][0] < range.upper) {
points.push([range.upper, lastOpacity]);
}
}
return dedupeOpacityPoints(points);
}
const opacity =
colormap.opacity !== undefined
? clampToUnit(colormap.opacity as number)
: clampToUnit(fallbackOpacity);
if (threshold === undefined) {
return [
[range.lower, opacity],
[range.upper, opacity],
];
}
if (threshold >= range.upper) {
return [
[range.lower, 0],
[range.upper, 0],
];
}
return [
[range.lower, 0],
[Math.max(range.lower, threshold - delta), 0],
[threshold, opacity],
[range.upper, opacity],
];
}
function resolvePointOpacityAtValue(
scalarValue: number,
opacityPoints: Array<{ value: number; opacity: number }>,
fallbackOpacity: number
): number {
if (!opacityPoints.length) {
return clampToUnit(fallbackOpacity);
}
if (scalarValue <= opacityPoints[0].value) {
return opacityPoints[0].opacity;
}
for (let i = 1; i < opacityPoints.length; i++) {
const previous = opacityPoints[i - 1];
const current = opacityPoints[i];
if (scalarValue <= current.value) {
const pointRange = current.value - previous.value;
const t =
pointRange > 0 ? (scalarValue - previous.value) / pointRange : 0;
return clampToUnit(
previous.opacity + (current.opacity - previous.opacity) * t
);
}
}
return opacityPoints[opacityPoints.length - 1].opacity;
}
function dedupeOpacityPoints(
points: Array<[number, number]>
): Array<[number, number]> {
const deduped: Array<[number, number]> = [];
points.forEach(([value, opacity]) => {
const lastPoint = deduped[deduped.length - 1];
if (lastPoint && lastPoint[0] === value) {
lastPoint[1] = opacity;
return;
}
deduped.push([value, opacity]);
});
return deduped;
}
function getCurrentMaxOpacity(actor: vtkImageSlice): number {
const opacityFunction = actor.getProperty().getScalarOpacity(0);
const opacityValues = opacityFunction?.getDataPointer?.();
if (!opacityValues?.length) {
return actor.getProperty().getOpacity?.() ?? 1;
}
let maxOpacity = 0;
for (let i = 1; i < opacityValues.length; i += 2) {
if (opacityValues[i] > maxOpacity) {
maxOpacity = opacityValues[i];
}
}
return clampToUnit(maxOpacity || 1);
}
function clampToUnit(value: number): number {
return Math.max(0, Math.min(1, value));
}
function getVolumeNumberOfComponents(actor: vtkImageSlice): number {
const mapperInputData = actor.getMapper()?.getInputData?.();
const scalars = mapperInputData?.getPointData?.()?.getScalars?.();
const imageDataMetadata = mapperInputData?.get?.('numberOfComponents') as
| { numberOfComponents?: number }
| undefined;
return (
scalars?.getNumberOfComponents?.() ??
imageDataMetadata?.numberOfComponents ??
1
);
}
/**
* Returns the full voxel data range of the volume behind an actor (the streaming
* volume's voxelManager range, mirroring the legacy threshold path), falling back
* to the vtk scalar range. Used as the domain for an absolute opacity threshold,
* which is expressed in voxel/SUV units rather than the (often narrower) VOI range.
*/
function getActorScalarRange(actor: vtkImageSlice): VOIRange | undefined {
const mapperInputData = actor.getMapper()?.getInputData?.();
const voxelManager = (
mapperInputData?.get?.('voxelManager') as
| { voxelManager?: { getRange?: () => [number, number] } }
| undefined
)?.voxelManager;
const voxelRange = voxelManager?.getRange?.();
if (
voxelRange &&
Number.isFinite(voxelRange[0]) &&
Number.isFinite(voxelRange[1]) &&
voxelRange[1] > voxelRange[0]
) {
return { lower: voxelRange[0], upper: voxelRange[1] };
}
const scalarRange = mapperInputData
?.getPointData?.()
?.getScalars?.()
?.getRange?.();
if (
scalarRange &&
Number.isFinite(scalarRange[0]) &&
Number.isFinite(scalarRange[1]) &&
scalarRange[1] > scalarRange[0]
) {
return { lower: scalarRange[0], upper: scalarRange[1] };
}
return undefined;
}
function resolveVolumeOpacityRange(
actor: vtkImageSlice,
voiRange?: VOIRange
): VOIRange {
if (
voiRange &&
Number.isFinite(voiRange.lower) &&
Number.isFinite(voiRange.upper)
) {
return voiRange;
}
const mapperInputData = actor.getMapper()?.getInputData?.();
const scalarRange = mapperInputData
?.getPointData?.()
?.getScalars?.()
?.getRange?.();
if (
scalarRange &&
Number.isFinite(scalarRange[0]) &&
Number.isFinite(scalarRange[1])
) {
return {
lower: scalarRange[0],
upper: scalarRange[1],
};
}
const transferRange = actor
.getProperty()
.getRGBTransferFunction(0)
?.getRange?.();
if (
transferRange &&
Number.isFinite(transferRange[0]) &&
Number.isFinite(transferRange[1])
) {
return {
lower: transferRange[0],
upper: transferRange[1],
};
}
return {
lower: 0,
upper: 1,
};
}
|