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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 | import type { IViewport } from '../../types/IViewport';
import type { ICanvasActor } from '../../types/IActor';
import CanvasProperties from './CanvasProperties';
import CanvasMapper from './CanvasMapper';
/**
* Handles canvas rendering of derived image data, typically label maps.
* This class will update the canvas from the given viewport with a
* derived image. The derived image can be a standard Cornerstone labelmap
* or be an RLE based one. The RLE based ones are significantly faster to
* render as they only render the area actually relevant.
*/
export default class CanvasActor implements ICanvasActor {
private image;
private derivedImage;
private canvasProperties = new CanvasProperties(this);
private visibility = false;
private mapper = new CanvasMapper(this);
private viewport;
protected className = 'CanvasActor';
protected canvas;
constructor(viewport: IViewport, derivedImage) {
this.derivedImage = derivedImage;
this.viewport = viewport;
}
/**
* Renders an RLE representation of the viewport data. This is optimized to
* avoid iterating over any data not actually containing data.
*/
protected renderRLE(viewport, context, voxelManager) {
const { width, height } = this.image;
let { canvas } = this;
if (!canvas || canvas.width !== width || canvas.height !== height) {
this.canvas = canvas = new window.OffscreenCanvas(width, height);
}
const localContext = canvas.getContext('2d');
const imageData = localContext.createImageData(width, height);
const { data: imageArray } = imageData;
imageArray.fill(0);
const { map } = voxelManager;
let dirtyX = Infinity;
let dirtyY = Infinity;
let dirtyX2 = -Infinity;
let dirtyY2 = -Infinity;
for (let y = 0; y < height; y++) {
const row = map.getRun(y, 0);
if (!row) {
continue;
}
dirtyY = Math.min(dirtyY, y);
dirtyY2 = Math.max(dirtyY2, y);
const baseOffset = (y * width) << 2;
let indicesToDelete;
for (const run of row) {
const { start, end, value: segmentIndex } = run;
if (segmentIndex === 0) {
indicesToDelete ||= [];
indicesToDelete.push(row.indexOf(run));
continue;
}
dirtyX = Math.min(dirtyX, start);
dirtyX2 = Math.max(dirtyX2, end);
const rgb = this.canvasProperties
.getColor(segmentIndex)
.map((v) => v * 255);
let startOffset = baseOffset + (start << 2);
for (let i = start; i < end; i++) {
imageArray[startOffset++] = rgb[0];
imageArray[startOffset++] = rgb[1];
imageArray[startOffset++] = rgb[2];
imageArray[startOffset++] = rgb[3];
}
}
}
if (dirtyX > width) {
return;
}
const dirtyWidth = dirtyX2 - dirtyX;
const dirtyHeight = dirtyY2 - dirtyY;
localContext.putImageData(
imageData,
0,
0,
dirtyX - 1,
dirtyY - 1,
dirtyWidth + 2,
dirtyHeight + 2
);
context.drawImage(
canvas,
dirtyX,
dirtyY,
dirtyWidth,
dirtyHeight,
dirtyX,
dirtyY,
dirtyWidth,
dirtyHeight
);
}
public render(viewport: IViewport, context: CanvasRenderingContext2D): void {
if (!this.visibility) {
return;
}
const image = this.image || this.getImage();
const { width, height } = image;
const data = image.getScalarData();
if (!data) {
return;
}
const { voxelManager } = image;
if (voxelManager) {
if (voxelManager.map.getRun) {
return this.renderRLE(viewport, context, voxelManager);
}
}
let { canvas } = this;
if (!canvas || canvas.width !== width || canvas.height !== height) {
this.canvas = canvas = new window.OffscreenCanvas(width, height);
}
const localContext = canvas.getContext('2d');
const imageData = localContext.createImageData(width, height);
const { data: imageArray } = imageData;
let offset = 0;
let destOffset = 0;
let dirtyX = Infinity;
let dirtyY = Infinity;
let dirtyX2 = -Infinity;
let dirtyY2 = -Infinity;
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
// const destOffset = (x + y * width) * 4;
const segmentIndex = data[offset++];
if (segmentIndex) {
dirtyX = Math.min(x, dirtyX);
dirtyY = Math.min(y, dirtyY);
dirtyX2 = Math.max(x, dirtyX2);
dirtyY2 = Math.max(y, dirtyY2);
const rgb = this.canvasProperties.getColor(segmentIndex);
imageArray[destOffset] = rgb[0] * 255;
imageArray[destOffset + 1] = rgb[1] * 255;
imageArray[destOffset + 2] = rgb[2] * 255;
imageArray[destOffset + 3] = 127;
// imageArray.fill(55, offset, offset + 4);
}
destOffset += 4;
}
}
if (dirtyX > width) {
return;
}
const dirtyWidth = dirtyX2 - dirtyX + 1;
const dirtyHeight = dirtyY2 - dirtyY + 1;
localContext.putImageData(
imageData,
0,
0,
dirtyX,
dirtyY,
dirtyWidth,
dirtyHeight
);
context.drawImage(
canvas,
dirtyX,
dirtyY,
dirtyWidth,
dirtyHeight,
dirtyX,
dirtyY,
dirtyWidth,
dirtyHeight
);
}
public getClassName() {
return this.className;
}
public getProperty() {
return this.canvasProperties;
}
public setVisibility(visibility: boolean) {
this.visibility = visibility;
}
public getMapper() {
return this.mapper;
}
public isA(actorType) {
return actorType === this.className;
}
public getImage() {
if (this.image) {
return this.image;
}
this.image = { ...this.derivedImage };
const imageData = this.viewport.getImageData();
Object.assign(this.image, {
worldToIndex: (worldPos) => imageData.imageData.worldToIndex(worldPos),
indexToWorld: (index, destPoint) =>
imageData.imageData.indexToWorld(index, destPoint),
getDimensions: () => imageData.dimensions,
getScalarData: () => this.derivedImage?.getPixelData(),
getDirection: () => imageData.direction,
getSpacing: () => imageData.spacing,
setOrigin: () => null,
/**
* Stores the new image cache data to update the image object, and sets
* the image instance (this object) to null so that the next getImage
* refreshes the display.
*/
setDerivedImage: (image) => {
this.derivedImage = image;
this.image = null;
},
modified: () => null,
});
return this.image;
}
}
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