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July 5, 2022 19:51
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webcodec cornerstone imageloader, works in chrome 105
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <h1> | |
| imageloader/index.html, for jpge | |
| </h1> | |
| <div id="dicomImage" style="width:512px;height:512px" oncontextmenu="return false" onmousedown="return false"> | |
| </div> | |
| </div> | |
| </body> | |
| <script src="//unpkg.com/cornerstone-core/dist/cornerstone.js"></script> | |
| <script> | |
| function loadImage(imageId) { | |
| return { | |
| promise: (async () => { | |
| const response = await fetch(imageId.slice(7)) | |
| const imageDecoder = new ImageDecoder({ data: response.body, type: 'image/jpeg', premultiplyAlpha: "premultiply", colorSpaceConversion: "none" }); | |
| const decoded = await imageDecoder.decode({ completeFramesOnly: true }); | |
| const { codedHeight: height, codedWidth: width } = decoded.image | |
| const pixelData = new Uint8Array(4 * width * height); | |
| await decoded.image.copyTo(pixelData) | |
| decoded.image.close() | |
| // BGRA to RGBA.. | |
| for (let i = 0, len = pixelData.length, t = 0; i < len; i += 4) { | |
| t = pixelData[i]; | |
| pixelData[i] = pixelData[i + 2] | |
| pixelData[i + 2] = t | |
| } | |
| return { | |
| imageId: imageId, | |
| minPixelValue: 0, | |
| maxPixelValue: 255, | |
| slope: 1.0, | |
| intercept: 0, | |
| windowCenter: 127, | |
| windowWidth: 256, | |
| render: cornerstone.renderColorImage, | |
| getPixelData: () => pixelData, | |
| rows: height, | |
| columns: width, | |
| height: height, | |
| width: width, | |
| color: true, | |
| columnPixelSpacing: 1.0, | |
| rowPixelSpacing: 1.0, | |
| invert: false, | |
| sizeInBytes: width * height * 3 | |
| }; | |
| })(), | |
| cancelFn: undefined | |
| } | |
| } | |
| cornerstone.registerImageLoader('jpeg', loadImage); | |
| const element = document.getElementById('dicomImage'); | |
| cornerstone.enable(element); | |
| cornerstone.loadImage('jpeg://img.jpeg').then((image) => cornerstone.displayImage(element, image)); | |
| </script> | |
| </html> |
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