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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | import setToPixelCoordinateSystem from './setToPixelCoordinateSystem';
import now from './now';
import initializeRenderCanvas from './initializeRenderCanvas';
import getLut from './getLut';
import saveLastRendered from './saveLastRendered';
import doesImageNeedToBeRendered from './doesImageNeedToBeRendered';
import storedPixelDataToCanvasImageDataPseudocolorLUT from './storedPixelDataToCanvasImageDataPseudocolorLUT';
import storedPixelDataToCanvasImageDataPseudocolorLUTPET from './storedPixelDataToCanvasImageDataPseudocolorLUTPET';
import * as colors from '../colors/index';
import type { IImage, CPUFallbackEnabledElement } from '../../../../types';
import { clamp } from '../../../../utilities';
/**
* Returns an appropriate canvas to render the Image. If the canvas available in the cache is appropriate
* it is returned, otherwise adjustments are made. It also sets the color transfer functions.
*
* @param {Object} enabledElement The cornerstone enabled element
* @param {Object} image The image to be rendered
* @param {Boolean} invalidated Is pixel data valid
* @returns {HTMLCanvasElement} An appropriate canvas for rendering the image
* @memberof rendering
*/
function getRenderCanvas(
enabledElement: CPUFallbackEnabledElement,
image: IImage,
invalidated: boolean
): HTMLCanvasElement {
if (!enabledElement.renderingTools.renderCanvas) {
enabledElement.renderingTools.renderCanvas =
document.createElement('canvas');
}
const renderCanvas = enabledElement.renderingTools.renderCanvas;
let colormap =
enabledElement.viewport.colormap || enabledElement.options.colormap;
if (enabledElement.options && enabledElement.options.colormap) {
console.warn(
'enabledElement.options.colormap is deprecated. Use enabledElement.viewport.colormap instead'
);
}
if (colormap && typeof colormap === 'string') {
colormap = colors.getColormap(colormap);
}
if (!colormap) {
throw new Error('renderPseudoColorImage: colormap not found.');
}
const colormapId = colormap.getId();
if (
doesImageNeedToBeRendered(enabledElement, image) === false &&
invalidated !== true &&
enabledElement.renderingTools.colormapId === colormapId
) {
return renderCanvas;
}
// If our render canvas does not match the size of this image reset it
// NOTE: This might be inefficient if we are updating multiple images of different
// Sizes frequently.
if (
renderCanvas.width !== image.width ||
renderCanvas.height !== image.height
) {
initializeRenderCanvas(enabledElement, image);
}
// Get the lut to use
let start = now();
if (
!enabledElement.renderingTools.colorLUT ||
invalidated ||
enabledElement.renderingTools.colormapId !== colormapId
) {
colormap.setNumberOfColors(256);
enabledElement.renderingTools.colorLUT = colormap.createLookupTable();
enabledElement.renderingTools.colormapId = colormapId;
}
const renderCanvasData = enabledElement.renderingTools.renderCanvasData;
const renderCanvasContext = enabledElement.renderingTools.renderCanvasContext;
const { viewport } = enabledElement;
const colorLUT = enabledElement.renderingTools.colorLUT;
if (viewport.modality === 'PT') {
const { windowWidth, windowCenter } = viewport.voi;
const minimum = windowCenter - windowWidth / 2;
const maximum = windowCenter + windowWidth / 2;
const range = maximum - minimum;
const collectedMultiplierTerms = 255.0 / range;
let petVOILutFunction;
if (viewport.invert) {
petVOILutFunction = (value) => {
return clamp(
Math.floor(255 - (value - minimum) * collectedMultiplierTerms),
0,
255
);
};
} else {
petVOILutFunction = (value) => {
return clamp(
Math.floor((value - minimum) * collectedMultiplierTerms),
0,
255
);
};
}
storedPixelDataToCanvasImageDataPseudocolorLUTPET(
image,
petVOILutFunction,
colorLUT,
renderCanvasData.data
);
} else {
const lut = getLut(image, enabledElement.viewport, invalidated);
image.stats = image.stats || {};
image.stats.lastLutGenerateTime = now() - start;
storedPixelDataToCanvasImageDataPseudocolorLUT(
image,
lut,
colorLUT,
renderCanvasData.data
);
}
start = now();
renderCanvasContext.putImageData(renderCanvasData, 0, 0);
image.stats.lastPutImageDataTime = now() - start;
return renderCanvas;
}
/**
* API function to draw a pseudo-color image to a given enabledElement
*
* @param {EnabledElement} enabledElement The Cornerstone Enabled Element to redraw
* @param {Boolean} invalidated - true if pixel data has been invalidated and cached rendering should not be used
* @returns {void}
* @memberof rendering
*/
export function renderPseudoColorImage(
enabledElement: CPUFallbackEnabledElement,
invalidated: boolean
): void {
if (enabledElement === undefined) {
throw new Error(
'drawImage: enabledElement parameter must not be undefined'
);
}
const image = enabledElement.image;
if (image === undefined) {
throw new Error('drawImage: image must be loaded before it can be drawn');
}
// Get the canvas context and reset the transform
const context = enabledElement.canvas.getContext('2d');
context.setTransform(1, 0, 0, 1, 0, 0);
// Clear the canvas
context.fillStyle = 'black';
context.fillRect(
0,
0,
enabledElement.canvas.width,
enabledElement.canvas.height
);
// Turn off image smooth/interpolation if pixelReplication is set in the viewport
context.imageSmoothingEnabled = !enabledElement.viewport.pixelReplication;
// Save the canvas context state and apply the viewport properties
setToPixelCoordinateSystem(enabledElement, context);
// If no options are set we will retrieve the renderCanvas through the
// Normal Canvas rendering path
// TODO: Add WebGL support for pseudocolor pipeline
const renderCanvas = getRenderCanvas(enabledElement, image, invalidated);
const sx = enabledElement.viewport.displayedArea.tlhc.x - 1;
const sy = enabledElement.viewport.displayedArea.tlhc.y - 1;
const width = enabledElement.viewport.displayedArea.brhc.x - sx;
const height = enabledElement.viewport.displayedArea.brhc.y - sy;
context.drawImage(renderCanvas, sx, sy, width, height, 0, 0, width, height);
enabledElement.renderingTools = saveLastRendered(enabledElement);
}
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