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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 | import now from './now';
import generateColorLUT from './generateColorLUT';
import storedColorPixelDataToCanvasImageData from './storedColorPixelDataToCanvasImageData';
import storedRGBAPixelDataToCanvasImageData from './storedRGBAPixelDataToCanvasImageData';
import setToPixelCoordinateSystem from './setToPixelCoordinateSystem';
import doesImageNeedToBeRendered from './doesImageNeedToBeRendered';
import initializeRenderCanvas from './initializeRenderCanvas';
import saveLastRendered from './saveLastRendered';
import {
IImage,
CPUFallbackViewport,
CPUFallbackEnabledElement,
} from '../../../../types';
/**
* Generates an appropriate Look Up Table to render the given image with the given window width and level (specified in the viewport)
* Uses an internal cache for performance
*
* @param {Object} image The image to be rendered
* @param {Object} viewport The viewport values used for rendering
* @returns {Uint8ClampedArray} Look Up Table array.
* @memberof rendering
*/
function getLut(image: IImage, viewport: CPUFallbackViewport) {
// If we have a cached lut and it has the right values, return it immediately
if (
image.cachedLut !== undefined &&
image.cachedLut.windowCenter === viewport.voi.windowCenter &&
image.cachedLut.windowWidth === viewport.voi.windowWidth &&
image.cachedLut.invert === viewport.invert
) {
return image.cachedLut.lutArray;
}
// Lut is invalid or not present, regenerate it and cache it
generateColorLUT(
image,
viewport.voi.windowWidth,
viewport.voi.windowCenter,
viewport.invert
);
image.cachedLut.windowWidth = viewport.voi.windowWidth;
image.cachedLut.windowCenter = viewport.voi.windowCenter;
image.cachedLut.invert = viewport.invert;
return image.cachedLut.lutArray;
}
/**
* 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 enabledElement - The cornerstone enabled element
* @param image - The image to be rendered
* @param invalidated - Is pixel data valid
* @returns An appropriate canvas for rendering the image
* @memberof rendering
*/
function getRenderCanvas(
enabledElement: CPUFallbackEnabledElement,
image: IImage,
invalidated: boolean
): HTMLCanvasElement {
const canvasWasColor =
enabledElement.renderingTools.lastRenderedIsColor === true;
if (!enabledElement.renderingTools.renderCanvas || !canvasWasColor) {
enabledElement.renderingTools.renderCanvas =
document.createElement('canvas');
}
const renderCanvas = enabledElement.renderingTools.renderCanvas;
// The ww/wc is identity and not inverted - get a canvas with the image rendered into it for
// Fast drawing. Note that this is 256/128, and NOT 255/127, per the DICOM
// standard, but allow either.
const { windowWidth, windowCenter } = enabledElement.viewport.voi;
if (
(windowWidth === 256 || windowWidth === 255) &&
(windowCenter === 128 || windowCenter === 127) &&
enabledElement.viewport.invert === false &&
image.getCanvas &&
image.getCanvas()
) {
return image.getCanvas();
}
// Apply the lut to the stored pixel data onto the render canvas
if (
doesImageNeedToBeRendered(enabledElement, image) === false &&
invalidated !== true
) {
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();
const colorLUT = getLut(image, enabledElement.viewport);
image.stats = image.stats || {};
image.stats.lastLutGenerateTime = now() - start;
const renderCanvasData = enabledElement.renderingTools.renderCanvasData;
const renderCanvasContext = enabledElement.renderingTools.renderCanvasContext;
// The color image voi/invert has been modified - apply the lut to the underlying
// Pixel data and put it into the renderCanvas
if (image.rgba) {
storedRGBAPixelDataToCanvasImageData(
image,
colorLUT,
renderCanvasData.data
);
} else {
storedColorPixelDataToCanvasImageData(
image,
colorLUT,
renderCanvasData.data
);
}
start = now();
renderCanvasContext.putImageData(renderCanvasData, 0, 0);
image.stats.lastPutImageDataTime = now() - start;
return renderCanvas;
}
/**
* API function to render a color image to an enabled element
*
* @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 renderColorImage(
enabledElement: CPUFallbackEnabledElement,
invalidated: boolean
): void {
if (enabledElement === undefined) {
throw new Error(
'renderColorImage: enabledElement parameter must not be undefined'
);
}
const image = enabledElement.image;
if (image === undefined) {
throw new Error(
'renderColorImage: 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);
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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