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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | 428x 428x | import type {
CharlsModule,
JpegLSDecoder,
} from '@cornerstonejs/codec-charls/dist/charlswasm_decode';
// @ts-ignore
import charlsFactory from '@cornerstonejs/codec-charls/decodewasmjs';
// @ts-ignore
// import charlsWasm from '@cornerstonejs/codec-charls/decodewasm';
const charlsWasm = new URL(
'@cornerstonejs/codec-charls/decodewasm',
import.meta.url
);
import type { ByteArray } from 'dicom-parser';
import type { WebWorkerDecodeConfig } from '../../types';
import type { Types } from '@cornerstonejs/core';
const local: {
codec: CharlsModule;
decoder: JpegLSDecoder;
decodeConfig: WebWorkerDecodeConfig;
} = {
codec: undefined,
decoder: undefined,
decodeConfig: {} as WebWorkerDecodeConfig,
};
function getExceptionMessage(exception) {
return typeof exception === 'number'
? local.codec.getExceptionMessage(exception)
: exception;
}
export function initialize(
decodeConfig?: WebWorkerDecodeConfig
): Promise<void> {
local.decodeConfig = decodeConfig;
if (local.codec) {
return Promise.resolve();
}
const charlsModule = charlsFactory({
locateFile: (f) => {
if (f.endsWith('.wasm')) {
return charlsWasm.toString();
}
return f;
},
});
return new Promise((resolve, reject) => {
charlsModule.then((instance) => {
local.codec = instance;
local.decoder = new instance.JpegLSDecoder();
resolve();
}, reject);
});
}
/**
*
* @param {*} compressedImageFrame
* @param {object} imageInfo
* @param {boolean} imageInfo.signed - (pixelRepresentation === 1)
*/
async function decodeAsync(
compressedImageFrame,
imageInfo
): Promise<Types.IImageFrame> {
try {
await initialize();
const decoder = local.decoder;
// get pointer to the source/encoded bit stream buffer in WASM memory
// that can hold the encoded bitstream
const encodedBufferInWASM = decoder.getEncodedBuffer(
compressedImageFrame.length
);
// copy the encoded bitstream into WASM memory buffer
encodedBufferInWASM.set(compressedImageFrame);
// decode it
decoder.decode();
// get information about the decoded image
const frameInfo = decoder.getFrameInfo();
const interleaveMode = decoder.getInterleaveMode();
const nearLossless = decoder.getNearLossless();
// get the decoded pixels
const decodedPixelsInWASM = decoder.getDecodedBuffer();
const encodedImageInfo = {
columns: frameInfo.width,
rows: frameInfo.height,
bitsPerPixel: frameInfo.bitsPerSample,
signed: imageInfo.signed,
bytesPerPixel: imageInfo.bytesPerPixel,
componentsPerPixel: frameInfo.componentCount,
};
const pixelData = getPixelData(
frameInfo,
decodedPixelsInWASM,
imageInfo.signed
);
const encodeOptions = {
nearLossless,
interleaveMode,
frameInfo,
};
// local.codec.doLeakCheck();
return {
...imageInfo,
pixelData,
imageInfo: encodedImageInfo,
encodeOptions,
...encodeOptions,
...encodedImageInfo,
};
} catch (error) {
// Handle cases where WASM throws an error internally, and it only gives JS a number
// See https://emscripten.org/docs/porting/Debugging.html#handling-c-exceptions-from-javascript
// TODO: Copy to other codecs as well
throw getExceptionMessage(error);
}
}
function getPixelData(frameInfo, decodedBuffer: ByteArray, signed: boolean) {
if (frameInfo.bitsPerSample > 8) {
if (signed) {
return new Int16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
return new Uint16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
if (signed) {
return new Int8Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength
);
}
return new Uint8Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength
);
}
export default decodeAsync;
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