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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 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x | import type { ByteArray } from 'dicom-parser';
import getMinMax from '../shared/getMinMax';
import type { Types } from '@cornerstonejs/core';
/**
* Special decoder for 8 bit jpeg that leverages the browser's built in JPEG decoder for increased performance
*/
function arrayBufferToString(buffer: ArrayBuffer) {
return binaryToString(
String.fromCharCode.apply(
null,
Array.prototype.slice.apply(new Uint8Array(buffer))
)
);
}
function binaryToString(binary: string) {
let error;
try {
return decodeURIComponent(escape(binary));
} catch (_error) {
error = _error;
if (error instanceof URIError) {
return binary;
}
throw error;
}
}
function decodeJPEGBaseline8BitColor(
imageFrame: Types.IImageFrame,
pixelData: ByteArray,
canvas: HTMLCanvasElement
): Promise<Types.IImageFrame> {
const start = new Date().getTime();
const imgBlob = new Blob([pixelData], { type: 'image/jpeg' });
return new Promise((resolve, reject) => {
const fileReader = new FileReader();
Iif (fileReader.readAsBinaryString === undefined) {
fileReader.readAsArrayBuffer(imgBlob);
} else {
fileReader.readAsBinaryString(imgBlob); // doesn't work on IE11
}
fileReader.onload = function () {
const img = new Image();
img.onload = function () {
canvas.height = img.height;
canvas.width = img.width;
imageFrame.rows = img.height;
imageFrame.columns = img.width;
const context = canvas.getContext('2d');
/**
* @todo check this context
*/
// eslint-disable-next-line @typescript-eslint/no-explicit-any
context.drawImage(this as any, 0, 0);
const imageData = context.getImageData(0, 0, img.width, img.height);
const end = new Date().getTime();
imageFrame.pixelData = new Uint8Array(imageData.data.buffer);
imageFrame.imageData = imageData;
imageFrame.decodeTimeInMS = end - start;
// calculate smallest and largest PixelValue
const minMax = getMinMax(imageFrame.pixelData);
imageFrame.smallestPixelValue = minMax.min;
imageFrame.largestPixelValue = minMax.max;
imageFrame.pixelDataLength = imageFrame.pixelData.length;
resolve(imageFrame);
};
img.onerror = function (error) {
reject(error);
};
Iif (fileReader.readAsBinaryString === undefined) {
img.src = `data:image/jpeg;base64,${window.btoa(
arrayBufferToString(fileReader.result as ArrayBuffer)
)}`;
} else {
img.src = `data:image/jpeg;base64,${window.btoa(
fileReader.result as string
)}`; // doesn't work on IE11
}
};
fileReader.onerror = (e) => {
reject(e);
};
});
}
export default decodeJPEGBaseline8BitColor;
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