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import type { CPUIImageData, Point2, Point3, VOIRange } from '../../../types';
import type {
WSIImageDataMetadata,
WSIMapViewLike,
} from '../../../utilities/WSIUtilities';
import { Transform } from '../../helpers/cpuFallback/rendering/transform';
export function computeWSITransforms(metadata?: WSIImageDataMetadata) {
if (!metadata) {
return;
}
const indexToWorld = mat4.create();
const worldToIndexMatrix = mat4.create();
mat4.fromTranslation(indexToWorld, metadata.origin);
indexToWorld[0] = metadata.direction[0];
indexToWorld[1] = metadata.direction[1];
indexToWorld[2] = metadata.direction[2];
indexToWorld[4] = metadata.direction[3];
indexToWorld[5] = metadata.direction[4];
indexToWorld[6] = metadata.direction[5];
indexToWorld[8] = metadata.direction[6];
indexToWorld[9] = metadata.direction[7];
indexToWorld[10] = metadata.direction[8];
mat4.scale(indexToWorld, indexToWorld, metadata.spacing);
mat4.invert(worldToIndexMatrix, indexToWorld);
return {
indexToWorld,
worldToIndexMatrix,
};
}
export function worldToIndexWSIMetadata(
metadata: WSIImageDataMetadata | undefined,
point: Point3
): Point3 {
const transforms = computeWSITransforms(metadata);
if (!transforms) {
return [0, 0, 0];
}
const imageCoord = vec3.create();
vec3.transformMat4(imageCoord, point, transforms.worldToIndexMatrix);
return [imageCoord[0], imageCoord[1], imageCoord[2]];
}
export function indexToWorldWSIMetadata(
metadata: WSIImageDataMetadata | undefined,
point: Point3
): Point3 {
const transforms = computeWSITransforms(metadata);
if (!transforms) {
return [0, 0, 0];
}
const worldPos = vec3.create();
vec3.transformMat4(worldPos, point, transforms.indexToWorld);
return [worldPos[0], worldPos[1], worldPos[2]];
}
export function buildWSIImageData(args: {
metadata?: WSIImageDataMetadata;
modality?: string;
frameOfReferenceUID?: string | null;
}): CPUIImageData | null {
const { metadata, modality = 'SM', frameOfReferenceUID } = args;
if (!metadata) {
return null;
}
const imageData = {
getDirection: () =>
metadata.direction as unknown as CPUIImageData['direction'],
getDimensions: () => metadata.dimensions,
getRange: () => [0, 255] as [number, number],
getScalarData: () => null as unknown as CPUIImageData['scalarData'],
getSpacing: () => metadata.spacing,
worldToIndex: (point: Point3) => {
return worldToIndexWSIMetadata(metadata, point);
},
indexToWorld: (point: Point3) => {
return indexToWorldWSIMetadata(metadata, point);
},
};
return {
dimensions: metadata.dimensions,
spacing: metadata.spacing,
numberOfComponents: 3,
origin: metadata.origin,
direction: metadata.direction as unknown as CPUIImageData['direction'],
metadata: {
Modality: modality,
FrameOfReferenceUID: frameOfReferenceUID || '',
},
hasPixelSpacing: metadata.hasPixelSpacing,
preScale: {
scaled: false,
},
scalarData: null as unknown as CPUIImageData['scalarData'],
imageData,
};
}
export function buildWSIColorTransform(
voiRange?: VOIRange,
averageWhite?: [number, number, number]
): string | undefined {
if (!voiRange && !averageWhite) {
return;
}
const white = averageWhite || [255, 255, 255];
const maxWhite = Math.max(...white);
const scaleWhite = white.map((value) => maxWhite / value);
const { lower = 0, upper = 255 } = voiRange || {};
const wlScale = (upper - lower + 1) / 255;
const wlDelta = lower / 255;
return `url('data:image/svg+xml,\
<svg xmlns="http://www.w3.org/2000/svg">\
<filter id="colour" color-interpolation-filters="linearRGB">\
<feColorMatrix type="matrix" \
values="\
${scaleWhite[0] * wlScale} 0 0 0 ${wlDelta} \
0 ${scaleWhite[1] * wlScale} 0 0 ${wlDelta} \
0 0 ${scaleWhite[2] * wlScale} 0 ${wlDelta} \
0 0 0 1 0" />\
</filter>\
</svg>#colour')`;
}
export function canvasToIndexForWSI(args: {
canvasPos: Point2;
canvasWidth: number;
canvasHeight: number;
view: WSIMapViewLike;
devicePixelRatio?: number;
}): Point3 {
const transform = getWSICanvasTransform(args);
transform.invert();
const indexPoint = transform.transformPoint(
args.canvasPos.map(
(value) => value * (args.devicePixelRatio || window.devicePixelRatio || 1)
) as Point2
);
return [indexPoint[0], indexPoint[1], 0];
}
export function indexToCanvasForWSI(args: {
indexPos: Point3;
canvasWidth: number;
canvasHeight: number;
view: WSIMapViewLike;
devicePixelRatio?: number;
}): Point2 {
const transform = getWSICanvasTransform(args);
return transform
.transformPoint([args.indexPos[0], args.indexPos[1]])
.map(
(value) => value / (args.devicePixelRatio || window.devicePixelRatio || 1)
) as Point2;
}
function getWSICanvasTransform(args: {
canvasWidth: number;
canvasHeight: number;
view: WSIMapViewLike;
devicePixelRatio?: number;
}): Transform {
const resolution = args.view.getResolution();
const rotation = args.view.getRotation();
const center = args.view.getCenter();
const halfCanvas = [
Math.max(args.canvasWidth, 1) / 2,
Math.max(args.canvasHeight, 1) / 2,
];
const transform = new Transform();
transform.translate(halfCanvas[0], halfCanvas[1]);
transform.rotate(rotation);
transform.scale(1 / resolution, -1 / resolution);
transform.translate(-center[0], -center[1]);
return transform;
}
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