js-dicom/src/ImageUtility/decodeImageFrame.js

this is js-dicom

import decodeLittleEndian from './decoders/decodeLittleEndian';
import decodeBigEndian from './decoders/decodeBigEndian';
import decodeRLE from './decoders/decodeRLE';
import decodeJPEGBaseline from './decoders/decodeJPEGBaseline';
import decodeJPEGLossless from './decoders/decodeJPEGLossless';
import decodeJPEGLS from './decoders/decodeJPEGLS';
import decodeJPEG2000 from './decoders/decodeJPEG2000';
import decodeJPEGBaseline8BitColor from './decodeJPEGBaseline8BitColor';

// var defaultConfig = {
//     maxWebWorkers: navigator.hardwareConcurrency || 1,
//     startWebWorkersOnDemand: true,
//     webWorkerPath: '../../dist/cornerstoneWADOImageLoaderWebWorker.js',
//     webWorkerTaskPaths: [],
//     taskConfiguration: {
//         decodeTask: {
//             loadCodecsOnStartup: true,
//             initializeCodecsOnStartup: false,
//             codecsPath: '../dist/cornerstoneWADOImageLoaderCodecs.js',
//             usePDFJS: false
//         }
//     }
// };

const decodeConfig = {

    loadCodecsOnStartup: true,
    initializeCodecsOnStartup: false,
    //codecsPath: '../dist/cornerstoneWADOImageLoaderCodecs.js',
    codecsPath:'',
    usePDFJS: false
}

//function decodeImageFrame (imageFrame, transferSyntax, pixelData, decodeConfig, options) {
function decodeImageFrame (imageFrame, transferSyntax, pixelData, canvas, options) {


    if (transferSyntax === '1.2.840.10008.1.2') {
        // Implicit VR Little Endian
        imageFrame = decodeLittleEndian(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.1') {
        // Explicit VR Little Endian
        imageFrame = decodeLittleEndian(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.2') {
        // Explicit VR Big Endian (retired)
        imageFrame = decodeBigEndian(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.1.99') {
        // Deflate transfer syntax (deflated by dicomParser)
        imageFrame = decodeLittleEndian(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.5') {
        // RLE Lossless
        imageFrame = decodeRLE(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.50') {
        // JPEG Baseline lossy process 1 (8 bit)

        if (imageFrame.bitsAllocated === 8 &&
            (imageFrame.samplesPerPixel === 3 || imageFrame.samplesPerPixel === 4)) {
            ///这里异步处理不知道怎么办。暂时放下。。。。
            imageFrame =  decodeJPEGBaseline8BitColor(imageFrame, pixelData, canvas)
            return imageFrame;
        }

        imageFrame = decodeJPEGBaseline(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.51') {
        // JPEG Baseline lossy process 2 & 4 (12 bit)
        imageFrame = decodeJPEGBaseline(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.57') {
        // JPEG Lossless, Nonhierarchical (Processes 14)
        imageFrame = decodeJPEGLossless(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.70') {
        // JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])
        imageFrame = decodeJPEGLossless(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.80') {
        // JPEG-LS Lossless Image Compression
        imageFrame = decodeJPEGLS(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.81') {
        // JPEG-LS Lossy (Near-Lossless) Image Compression
        imageFrame = decodeJPEGLS(imageFrame, pixelData);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.90') {
        // JPEG 2000 Lossless

        imageFrame = decodeJPEG2000(imageFrame, pixelData, decodeConfig, options);
    } else if (transferSyntax === '1.2.840.10008.1.2.4.91') {
        // JPEG 2000 Lossy
        imageFrame = decodeJPEG2000(imageFrame, pixelData, decodeConfig, options);
    } else {
        if (console && console.log) {
            console.log(`Image cannot be decoded due to Unsupported transfer syntax ${transferSyntax}`);
        }

        throw `no decoder for transfer syntax ${transferSyntax}`;
    }

    /* Don't know if these work...
   // JPEG 2000 Part 2 Multicomponent Image Compression (Lossless Only)
   else if(transferSyntax === "1.2.840.10008.1.2.4.92")
   {
   return decodeJPEG2000(dataSet, frame);
   }
   // JPEG 2000 Part 2 Multicomponent Image Compression
   else if(transferSyntax === "1.2.840.10008.1.2.4.93")
   {
   return decodeJPEG2000(dataSet, frame);
   }
   */



    return imageFrame;
}

export default decodeImageFrame;