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import getMinMax from '../shared/getMinMax';
import type { DICOMLoaderImageOptions, DICOMLoaderIImage } from '../types';
import type { Types } from '@cornerstonejs/core';
import {
canRenderFloatTextures,
Enums,
metaData,
utilities,
} from '@cornerstonejs/core';
import convertColorSpace from './convertColorSpace';
import isColorConversionRequired from './isColorConversionRequired';
import decodeImageFrame from './decodeImageFrame';
import getImageFrame from './getImageFrame';
import getScalingParameters from './getScalingParameters';
import { getOptions } from './internal/options';
import isColorImageFn from '../shared/isColorImage';
import removeAFromRGBA from './removeAFromRGBA';
import isModalityLUTForDisplay from './isModalityLutForDisplay';
import setPixelDataType from './setPixelDataType';
let lastImageIdDrawn = '';
function createImage(
imageId: string,
pixelData: ByteArray,
transferSyntax: string,
options: DICOMLoaderImageOptions = {}
): Promise<DICOMLoaderIImage | Types.IImageFrame> {
// whether to use RGBA for color images, default true as cs-legacy uses RGBA
// but we don't need RGBA in cs3d, and it's faster, and memory-efficient
// in cs3d
const useRGBA = options.useRGBA;
// always preScale the pixel array unless it is asked not to
options.preScale = {
enabled:
options.preScale && options.preScale.enabled !== undefined
? options.preScale.enabled
: true,
};
Iif (!pixelData?.length) {
return Promise.reject(new Error('The pixel data is missing'));
}
const { MetadataModules } = Enums;
const canvas = document.createElement('canvas');
const imageFrame = getImageFrame(imageId);
imageFrame.decodeLevel = options.decodeLevel;
options.allowFloatRendering = canRenderFloatTextures();
// Get the scaling parameters from the metadata
Eif (options.preScale.enabled) {
const scalingParameters = getScalingParameters(metaData, imageId);
Eif (scalingParameters) {
options.preScale = {
...options.preScale,
scalingParameters: scalingParameters as Types.ScalingParameters,
};
}
}
const { decodeConfig } = getOptions();
// Remove any property of the `imageFrame` that cannot be transferred to the worker,
// such as promises and functions.
// This is necessary because the `imageFrame` object is passed to the worker.
Object.keys(imageFrame).forEach((key) => {
Iif (
typeof imageFrame[key] === 'function' ||
imageFrame[key] instanceof Promise
) {
delete imageFrame[key];
}
});
const decodePromise = decodeImageFrame(
imageFrame,
transferSyntax,
pixelData,
canvas,
options,
decodeConfig
);
const isColorImage = isColorImageFn(imageFrame.photometricInterpretation);
return new Promise<DICOMLoaderIImage | Types.IImageFrame>(
(resolve, reject) => {
// eslint-disable-next-line complexity
decodePromise.then(function (imageFrame: Types.IImageFrame) {
// If we have a target buffer that was written to in the
// Decode task, point the image to it here.
let alreadyTyped = false;
// We can safely render color image in 8 bit, so no need to convert
if (
options.targetBuffer &&
options.targetBuffer.type &&
!isColorImage
) {
const {
arrayBuffer,
type,
offset: rawOffset = 0,
length: rawLength,
} = options.targetBuffer;
const imageFrameLength = imageFrame.pixelDataLength;
const offset = rawOffset;
const length =
rawLength !== null && rawLength !== undefined
? rawLength
: imageFrameLength - offset;
const typedArrayConstructors = {
Uint8Array,
Uint16Array,
Int16Array,
Float32Array,
Uint32Array,
};
Iif (length !== imageFrame.pixelDataLength) {
throw new Error(
`target array for image does not have the same length (${length}) as the decoded image length (${imageFrame.pixelDataLength}).`
);
}
const TypedArrayConstructor = typedArrayConstructors[type];
// TypedArray.Set is api level and ~50x faster than copying elements even for
// Arrays of different types, which aren't simply memcpy ops.
const typedArray = arrayBuffer
? new TypedArrayConstructor(arrayBuffer, offset, length)
: new TypedArrayConstructor(imageFrame.pixelData);
Iif (length !== imageFrame.pixelDataLength) {
throw new Error(
'target array for image does not have the same length as the decoded image length.'
);
}
imageFrame.pixelData = typedArray;
alreadyTyped = true;
}
if (!alreadyTyped) {
setPixelDataType(imageFrame);
}
const imagePlaneModule: Types.ImagePlaneModuleMetadata =
metaData.get(MetadataModules.IMAGE_PLANE, imageId) || {};
const voiLutModule =
metaData.get(MetadataModules.VOI_LUT, imageId) || {};
const modalityLutModule =
metaData.get(MetadataModules.MODALITY_LUT, imageId) || {};
const sopCommonModule: Types.SopCommonModuleMetadata =
metaData.get(MetadataModules.SOP_COMMON, imageId) || {};
const calibrationModule =
metaData.get(MetadataModules.CALIBRATION, imageId) || {};
const { rows, columns } = imageFrame;
if (isColorImage) {
if (isColorConversionRequired(imageFrame)) {
canvas.height = imageFrame.rows;
canvas.width = imageFrame.columns;
const context = canvas.getContext('2d');
let imageData = context.createImageData(
imageFrame.columns,
imageFrame.rows
);
Eif (!useRGBA) {
// Use a hard coded 3 samples per pixel for the destination, as the
// original samples per pixel may not be 3 for palette color
imageData = {
...imageData,
data: new Uint8ClampedArray(
3 * imageFrame.columns * imageFrame.rows
),
};
}
convertColorSpace(imageFrame, imageData.data, useRGBA);
imageFrame.imageData = imageData;
imageFrame.pixelData = imageData.data;
imageFrame.pixelDataLength = imageData.data.length;
} else if (
!useRGBA &&
imageFrame.pixelDataLength === 4 * rows * columns
) {
// This case is the case where we need RGB (that is !useRGBA), and
// we have RGBA (that is 4 values per pixel, not 3). For this case,
// remove the A value.
// Note: rendering libraries like vtk expect Uint8Array for RGB images
// otherwise they will convert them to Float32Array which might be slow
const colorBuffer = new Uint8Array(
(imageFrame.pixelData.length / 4) * 3
);
// remove the A from the RGBA of the imageFrame
imageFrame.pixelData = removeAFromRGBA(
imageFrame.pixelData,
colorBuffer
);
imageFrame.pixelDataLength = imageFrame.pixelData.length;
}
// else {
// No need to do any conversion - already RGB
// Consider RGB to RGBA conversion?
/** @todo check as any */
// calculate smallest and largest PixelValue of the converted pixelData
const minMax = getMinMax(imageFrame.pixelData);
imageFrame.smallestPixelValue = minMax.min;
imageFrame.largestPixelValue = minMax.max;
}
// Set numberOfComponents based on photometric interpretation
let numberOfComponents = imageFrame.samplesPerPixel;
if (imageFrame.photometricInterpretation === 'PALETTE COLOR') {
numberOfComponents = useRGBA ? 4 : 3;
}
const voxelManager = utilities.VoxelManager.createImageVoxelManager({
scalarData: imageFrame.pixelData,
width: imageFrame.columns,
height: imageFrame.rows,
numberOfComponents: numberOfComponents,
});
const image: DICOMLoaderIImage = {
imageId,
dataType: imageFrame.pixelData.constructor
.name as Types.PixelDataTypedArrayString,
color: isColorImage,
calibration: calibrationModule,
columnPixelSpacing: imagePlaneModule.columnPixelSpacing,
columns: imageFrame.columns,
height: imageFrame.rows,
preScale: imageFrame.preScale,
intercept: modalityLutModule.rescaleIntercept
? modalityLutModule.rescaleIntercept
: 0,
slope: modalityLutModule.rescaleSlope
? modalityLutModule.rescaleSlope
: 1,
invert: imageFrame.photometricInterpretation === 'MONOCHROME1',
minPixelValue: imageFrame.smallestPixelValue,
maxPixelValue: imageFrame.largestPixelValue,
rowPixelSpacing: imagePlaneModule.rowPixelSpacing,
rows: imageFrame.rows,
sizeInBytes: imageFrame.pixelData.byteLength,
width: imageFrame.columns,
// use the first value for rendering, if other values
// are needed later, it can be grabbed again from the voiLUtModule
windowCenter: voiLutModule.windowCenter
? voiLutModule.windowCenter[0]
: undefined,
windowWidth: voiLutModule.windowWidth
? voiLutModule.windowWidth[0]
: undefined,
voiLUTFunction: voiLutModule.voiLUTFunction
? voiLutModule.voiLUTFunction
: undefined,
decodeTimeInMS: imageFrame.decodeTimeInMS,
floatPixelData: undefined,
imageFrame,
voxelManager,
rgba: isColorImage && useRGBA,
getPixelData: () => imageFrame.pixelData,
getCanvas: undefined,
numberOfComponents: numberOfComponents,
};
if (image.color) {
image.getCanvas = function () {
// the getCanvas function is used in the CPU rendering path
// and it is used to use the canvas api to draw the image
// instead of looping through the pixel data and drawing each pixel
// to use the canvas api, we need to convert the pixel data to a
// Uint8ClampedArray (which is what the canvas api expects)
// and then we can use the putImageData api to draw the image
// However, if the image already was loaded without the alpha channel
// we need to add the alpha channel back in
if (lastImageIdDrawn === imageId) {
return canvas;
}
const width = image.columns;
const height = image.rows;
canvas.height = height;
canvas.width = width;
const ctx = canvas.getContext('2d');
const imageData = ctx.createImageData(width, height);
const arr = imageFrame.pixelData;
if (arr.length === width * height * 4) {
for (let i = 0; i < arr.length; i++) {
imageData.data[i] = arr[i];
}
}
// Set pixel data for RGB array
else if (arr.length === width * height * 3) {
let j = 0;
for (let i = 0; i < arr.length; i += 3) {
imageData.data[j++] = arr[i];
imageData.data[j++] = arr[i + 1];
imageData.data[j++] = arr[i + 2];
imageData.data[j++] = 255;
}
}
imageFrame.pixelData = imageData.data;
imageFrame.pixelDataLength = imageData.data.length;
imageFrame.imageData = imageData;
ctx.putImageData(imageFrame.imageData, 0, 0);
lastImageIdDrawn = imageId;
return canvas;
};
}
// Modality LUT
Iif (
modalityLutModule.modalityLUTSequence &&
modalityLutModule.modalityLUTSequence.length > 0 &&
isModalityLUTForDisplay(sopCommonModule.sopClassUID)
) {
image.modalityLUT = modalityLutModule.modalityLUTSequence[0];
}
// VOI LUT
Iif (
voiLutModule.voiLUTSequence &&
voiLutModule.voiLUTSequence.length > 0
) {
image.voiLUT = voiLutModule.voiLUTSequence[0];
}
if (image.color) {
// Note that by the DICOM definition, the window width and center are
// 256/128 for an identity transform.
image.windowWidth = 256;
image.windowCenter = 128;
}
// set the ww/wc to cover the dynamic range of the image if no values are supplied
if (
image.windowCenter === undefined ||
image.windowWidth === undefined
) {
const windowLevel = utilities.windowLevel.toWindowLevel(
image.imageFrame.smallestPixelValue,
image.imageFrame.largestPixelValue
);
image.windowWidth = windowLevel.windowWidth;
image.windowCenter = windowLevel.windowCenter;
}
resolve(image);
}, reject);
}
);
}
export default createImage;
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