Press n or j to go to the next uncovered block, b, p or k for the previous block.
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 | import now from './now'; import { IImage } from '../../../../types'; /** * This function transforms stored pixel values into a canvas image data buffer * by using a LUT. * * @param {Image} image A Cornerstone Image Object * @param {Array} lut Lookup table array * @param {Uint8ClampedArray} canvasImageDataData canvasImageData.data buffer filled with white pixels * * @returns {void} * @memberof Internal */ export default function ( image: IImage, lut: Uint8ClampedArray, canvasImageDataData: Uint8ClampedArray ): void { let start = now(); const pixelData = image.getPixelData(); image.stats.lastGetPixelDataTime = now() - start; const numPixels = pixelData.length; const minPixelValue = image.minPixelValue; let canvasImageDataIndex = 0; let storedPixelDataIndex = 0; let pixelValue; // NOTE: As of Nov 2014, most javascript engines have lower performance when indexing negative indexes. // We have a special code path for this case that improves performance. Thanks to @jpambrun for this enhancement // Added two paths (Int16Array, Uint16Array) to avoid polymorphic deoptimization in chrome. start = now(); if (pixelData instanceof Int16Array) { if (minPixelValue < 0) { while (storedPixelDataIndex < numPixels) { pixelValue = lut[pixelData[storedPixelDataIndex++] + -minPixelValue]; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = 255; // Alpha } } else { while (storedPixelDataIndex < numPixels) { pixelValue = lut[pixelData[storedPixelDataIndex++]]; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = 255; // Alpha } } } else if (pixelData instanceof Uint16Array) { while (storedPixelDataIndex < numPixels) { pixelValue = lut[pixelData[storedPixelDataIndex++]]; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = 255; // Alpha } } else if (minPixelValue < 0) { while (storedPixelDataIndex < numPixels) { pixelValue = lut[pixelData[storedPixelDataIndex++] + -minPixelValue]; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = 255; // Alpha } } else { while (storedPixelDataIndex < numPixels) { pixelValue = lut[pixelData[storedPixelDataIndex++]]; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = pixelValue; canvasImageDataData[canvasImageDataIndex++] = 255; // Alpha } } image.stats.lastStoredPixelDataToCanvasImageDataTime = now() - start; } |