Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import vtkRTAnalyticSource from 'vtk.js/Sources/Filters/Sources/RTAnalyticSource';
let REMOVE_DOM_ELEMENTS = true;
function createCanvasContext() {
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
return { canvas, context };
}
function getImageDataFromURI(imageDataURI) {
return new Promise((resolve, reject) => {
const { canvas, context } = createCanvasContext();
const img = new Image();
img.addEventListener('load', () => {
canvas.width = img.width;
canvas.height = img.height;
context.drawImage(img, 0, 0);
resolve(context.getImageData(0, 0, img.width, img.height));
});
img.addEventListener('error', reject);
img.src = imageDataURI;
});
}
/**
* Compares two images
* @param image the image under test
* @param baselines an array of baseline images
* @param tapeContext tape testing context
* @param opts if number: mismatch tolerance. if object: tolerance and pixel threshold
*/
async function compareImages(
image,
baselines,
testName,
tapeContext,
opts,
nextCallback
) {
// defaults
let pixelThreshold = 0.1;
let mismatchTolerance = 5; // percent
if (typeof opts === 'number') {
mismatchTolerance = opts;
} else E{
pixelThreshold = opts?.pixelThreshold ?? pixelThreshold;
mismatchTolerance = opts?.mismatchTolerance ?? mismatchTolerance;
}
let minDelta = 100;
let minRawCount = 0;
let minDiff = '';
let minIndex = 0;
let isSameDimensions = false;
const imageUnderTest = await getImageDataFromURI(image);
const baselineImages = await Promise.all(
baselines.map((baseline) => getImageDataFromURI(baseline))
);
baselineImages.forEach((baseline, idx) => {
const diff = createCanvasContext();
const { width, height } = baseline;
diff.canvas.width = width;
diff.canvas.height = height;
const diffImage = diff.context.createImageData(width, height);
const mismatched = pixelmatch(
imageUnderTest.data,
baseline.data,
diffImage.data,
width,
height,
{
alpha: 0.5,
includeAA: false,
threshold: pixelThreshold,
}
);
const percentage = (100 * mismatched) / (width * height);
if (percentage < minDelta) {
minDelta = percentage;
minRawCount = mismatched;
diff.context.putImageData(diffImage, 0, 0);
minDiff = diff.canvas.toDataURL();
minIndex = idx;
isSameDimensions =
width === imageUnderTest.width && height === imageUnderTest.height;
}
});
tapeContext.ok(isSameDimensions, 'Image match resolution');
tapeContext.ok(
minDelta < mismatchTolerance,
`[${testName}]` +
` Matching image - delta ${minDelta.toFixed(2)}%` +
` (count: ${minRawCount})`,
{
operator: 'imagediff',
actual: {
outputImage: image,
expectedImage: baselines[minIndex],
diffImage: minDiff,
},
expected: mismatchTolerance,
}
);
if (nextCallback) {
nextCallback();
} else E{
tapeContext.end();
}
}
function createGarbageCollector(testContext) {
const resources = [];
const domElements = [];
function registerResource(vtkObj, priority = 0) {
resources.push({ vtkObj, priority });
return vtkObj;
}
function registerDOMElement(el) {
domElements.push(el);
return el;
}
function releaseResources() {
// DOM Element handling
if (REMOVE_DOM_ELEMENTS) {
domElements.forEach((el) => {
if (el.parentNode) {
el.parentNode.removeChild(el);
}
});
}
while (domElements.length) {
domElements.pop();
}
// vtkObject handling
resources.sort((a, b) => b.priority - a.priority);
resources.forEach(({ vtkObj }) => {
if (vtkObj) {
vtkObj.delete();
}
});
while (resources.length) {
resources.pop();
}
// Test end handling
if (testContext) {
testContext.end();
}
}
return {
registerResource,
registerDOMElement,
releaseResources,
};
}
/**
* Convenience function to construct a test image.
* @param {Number[]} size Dimensions of the image as an array of size 3.
* @param {Number[]} spacing image voxel spacing.
* @returns Constructed image as vtkImageData
*/
function createImage(size, spacing) {
const source = vtkRTAnalyticSource.newInstance();
source.setWholeExtent([0, size[0] - 1, 0, size[1] - 1, 0, size[2] - 1]);
source.update();
const image = source.getOutputData();
image.setSpacing(spacing);
return image;
}
function keepDOM() {
REMOVE_DOM_ELEMENTS = false;
}
function removeDOM() {
REMOVE_DOM_ELEMENTS = true;
}
function arrayEquals(a, b) {
Iif (a.length !== b.length) {
return false;
}
for (let i = 0; i < a.length; ++i) {
if (a[i] !== b[i]) {
return false;
}
}
return true;
}
function objEquals(a, b) {
const k1 = Object.keys(a).sort();
const k2 = Object.keys(b).sort();
Iif (!arrayEquals(k1, k2)) {
return false;
}
for (let i = 0; i < k1.length; ++i) {
Iif (a[k1[i]] !== b[k1[i]]) {
return false;
}
}
return true;
}
export default {
arrayEquals,
compareImages,
createGarbageCollector,
createImage,
keepDOM,
objEquals,
removeDOM,
};
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