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Commit14c5636

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Fix repo build for M1 MacBooks (trekhleb#1029)
1 parentbbbfd32 commit14c5636

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8 files changed

+1365
-2231
lines changed

8 files changed

+1365
-2231
lines changed

‎package-lock.json

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‎package.json

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"@babel/cli":"7.20.7",
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"@babel/preset-env":"7.20.2",
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"@types/jest":"29.4.0",
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"canvas":"2.11.0",
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"eslint":"8.33.0",
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"eslint-config-airbnb":"19.0.4",
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"eslint-plugin-import":"2.27.5",
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"eslint-plugin-jest":"27.2.1",
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"eslint-plugin-jsx-a11y":"6.7.1",
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"husky":"8.0.3",
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"jest":"29.4.1"
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"jest":"29.4.1",
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"pngjs":"^7.0.0"
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},
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"engines": {
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"node":">=16.15.0",
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importfsfrom'fs';
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import{PNG}from'pngjs';
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importresizeImageWidthfrom'../resizeImageWidth';
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consttestImageBeforePath='./src/algorithms/image-processing/seam-carving/__tests__/test-image-before.png';
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consttestImageAfterPath='./src/algorithms/image-processing/seam-carving/__tests__/test-image-after.png';
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/**
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* Compares two images and finds the number of different pixels.
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*
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*@param {ImageData} imgA - ImageData for the first image.
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*@param {ImageData} imgB - ImageData for the second image.
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*@param {number} threshold - Color difference threshold [0..255]. Smaller - stricter.
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*@returns {number} - Number of different pixels.
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*/
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functionpixelsDiff(imgA,imgB,threshold=0){
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if(imgA.width!==imgB.width||imgA.height!==imgB.height){
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thrownewError('Images must have the same size');
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}
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letdifferentPixels=0;
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constnumColorParams=4;// RGBA
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for(letpixelIndex=0;pixelIndex<imgA.data.length;pixelIndex+=numColorParams){
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// Get pixel's color for each image.
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const[aR,aG,aB]=imgA.data.subarray(pixelIndex,pixelIndex+numColorParams);
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const[bR,bG,bB]=imgB.data.subarray(pixelIndex,pixelIndex+numColorParams);
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// Get average pixel's color for each image (make them greyscale).
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constaAvgColor=Math.floor((aR+aG+aB)/3);
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constbAvgColor=Math.floor((bR+bG+bB)/3);
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// Compare pixel colors.
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if(Math.abs(aAvgColor-bAvgColor)>threshold){
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differentPixels+=1;
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}
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}
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returndifferentPixels;
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}
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constpngLoad=(path)=>newPromise((resolve)=>{
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fs.createReadStream(path)
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.pipe(newPNG())
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.on('parsed',functionParsed(){
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/**@type {ImageData} */
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constimageData={
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colorSpace:'srgb',
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width:this.width,
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height:this.height,
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data:this.data,
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};
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resolve(imageData);
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});
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});
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describe('resizeImageWidth',()=>{
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it('should perform content-aware image width reduction',async()=>{
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constimgBefore=awaitpngLoad(testImageBeforePath);
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constimgAfter=awaitpngLoad(testImageAfterPath);
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consttoWidth=Math.floor(imgBefore.width/2);
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const{
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img:imgResized,
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size:resizedSize,
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}=resizeImageWidth({img:imgBefore, toWidth});
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expect(imgResized).toBeDefined();
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expect(resizedSize).toBeDefined();
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expect(resizedSize).toEqual({w:toWidth,h:imgBefore.height});
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expect(imgResized.width).toBe(imgAfter.width);
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expect(imgResized.height).toBe(imgAfter.height);
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constcolorThreshold=50;
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constdifferentPixels=pixelsDiff(imgResized,imgAfter,colorThreshold);
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// Allow 10% of pixels to be different
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constpixelsThreshold=Math.floor((imgAfter.width*imgAfter.height)/10);
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expect(differentPixels).toBeLessThanOrEqual(pixelsThreshold);
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});
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});

‎src/algorithms/image-processing/seam-carving/__tests__/resizeImageWidth.test.js

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