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How to use imageToCanvasContext method in backstopjs

Best JavaScript code snippet using backstopjs

ImageScrubber.js

Source:ImageScrubber.js

...135          let clampedImgData = getEmptyImgData(h, w);136          for (let i = divergedImgData.length - 1; i >= 0; i--) {137            clampedImgData.data[i] = divergedImgData[i];138          }139          const lcsDiffResult = imageToCanvasContext(null, h, w);140          lcsDiffResult.putImageData(clampedImgData, 0, 0);141          const divergedImageResult = lcsDiffResult.canvas.toDataURL(142            'image/png'143          );144          showScrubberDivergedImage(divergedImageResult);145          that.loadingDiverge(false);146        },147        false148      );149      worker.addEventListener('error', function (error) {150        showScrubberDivergedImage('');151        that.loadingDiverge(false);152        console.error(error);153      });154      worker.postMessage({155        divergedInput: [156          getImgDataDataFromContext(imageToCanvasContext(refImg)),157          getImgDataDataFromContext(imageToCanvasContext(testImg)),158          h,159          w160        ]161      });162    }163    const dontUseScrubberView = this.state.isRefImageMissing || !hasDiff;164    const showIsolatedRefImage = !hasDiff && scrubberModalMode === 'SHOW_SCRUBBER_REF_IMAGE';165    const showIsolatedTestImage = !hasDiff && scrubberModalMode === 'SHOW_SCRUBBER_TEST_IMAGE';166    return (167      <div>168        <WrapTitle>169          {hasDiff && (170            <div>171              <ScrubberViewBtn172                selected={scrubberModalMode === 'SHOW_SCRUBBER_REF_IMAGE'}173                onClick={showScrubberRefImage}174              >175                REFERENCE176              </ScrubberViewBtn>177              <ScrubberViewBtn178                selected={scrubberModalMode === 'SHOW_SCRUBBER_TEST_IMAGE'}179                onClick={showScrubberTestImage}180              >181                TEST182              </ScrubberViewBtn>183              <ScrubberViewBtn184                selected={scrubberModalMode === 'SHOW_SCRUBBER_DIFF_IMAGE'}185                onClick={showScrubberDiffImage}186              >187                DIFF188              </ScrubberViewBtn>189              <ScrubberViewBtn190                selected={scrubberModalMode === 'SCRUB'}191                onClick={showScrubber}192              >193                SCRUBBER194              </ScrubberViewBtn>195              <ScrubberViewBtn196                selected={scrubberModalMode === 'SHOW_SCRUBBER_DIVERGED_IMAGE'}197                onClick={divergedWorker}198                className={this.state.isLoading ? 'loadingDiverged' : ''}199                style={{200                  display: showDivergedOption() ? '' : 'none'201                }}202              >203                {this.state.isLoading ? 'DIVERGING!' : 'DIVERGED'}204              </ScrubberViewBtn>205            </div>206          )}207        </WrapTitle>208        <Wrapper>209          <img210            id="isolatedRefImage"211            src={refImage}212            style={{213              margin: 'auto',214              display: showIsolatedRefImage ? 'block' : 'none'215            }}216          />217          <img218            id="isolatedTestImage"219            className="testImage"220            src={testImage}221            style={{222              margin: 'auto',223              display: showIsolatedTestImage ? 'block' : 'none'224            }}225          />226          <img227            className="diffImage"228            src={diffImage}229            style={{230              margin: 'auto',231              display: dontUseScrubberView ? 'block' : 'none'232            }}233          />234          <div235            style={{236              display: dontUseScrubberView ? 'none' : 'block'237            }}238          >239            <TwentyTwenty240              verticalAlign="top"241              minDistanceToBeginInteraction={0}242              maxAngleToBeginInteraction={Infinity}243              initialPosition={position}244              newPosition={position}245            >246              <img247                id="scrubberRefImage"248                className="refImage"249                src={refImage}250                onError={this.handleRefImageLoadingError}251              />252              <img253                id="scrubberTestImage"254                className="testImage"255                src={scrubberTestImageSlug}256              />257              <SliderBar className="slider" />258            </TwentyTwenty>259          </div>260        </Wrapper>261      </div>262    );263  }264}265/**266 * ========= DIVERGED HELPERS ========267 */268function getImgDataDataFromContext (context) {269  return context.getImageData(0, 0, context.canvas.width, context.canvas.height)270    .data;271}272function getEmptyImgData (h, w) {273  var o = imageToCanvasContext(null, h, w);274  return o.createImageData(w, h);275}276function imageToCanvasContext (_img, h, w) {277  let img = _img;278  if (!_img) {279    img = { height: h, width: w };280  }281  const canvas = document.createElement('canvas');282  canvas.width = img.width;283  canvas.height = img.height;284  const context = canvas.getContext('2d');285  if (_img) {286    context.drawImage(img, 0, 0);287  }...

browser.js

Source:browser.js

...31function main() {32    console.time("total_time");33    const h = img2.height;34    const w = img2.width;35    const img1Ctx = imageToCanvasContext(img1);36    const img2Ctx = imageToCanvasContext(img2);37    const pixelmatchResultImgData = getEmptyImgData(h, w);38    pixelmatch(39        getImgDataDataFromContext(img1Ctx),40        getImgDataDataFromContext(img2Ctx),41        pixelmatchResultImgData.data,42        w,43        h, 44        { threshold: .1, includeAA: true }45    );46    console.time("pixelmatchResult");47    const pixelmatchResult = imageToCanvasContext(null, w, h);48    pixelmatchResult.putImageData(pixelmatchResultImgData, 0, 0);49    console.timeEnd("pixelmatchResult");50    console.time("diverged");51    const divergedImgData = diverged(getImgDataDataFromContext(img1Ctx), getImgDataDataFromContext(img2Ctx), h, w);52    console.timeEnd("diverged");53    // lcsImgData.data = divergedImgData;54    console.time("imgDataTolcsImgData");55    let clampedImgData = getEmptyImgData(h, w)56    for (var i = divergedImgData.length - 1; i >= 0; i--) {57        clampedImgData.data[i] = divergedImgData[i];58    }59    var lcsDiffResult = imageToCanvasContext(null, w, h);60    lcsDiffResult.putImageData(clampedImgData, 0, 0);61    console.timeEnd("imgDataTolcsImgData");62    // console.log('lcsDiffResult>>>', clampedImgData);63    console.timeEnd("total_time");64    document.getElementById('refImage').src = img1Ctx.canvas.toDataURL("image/png");65    document.getElementById('testImage').src = img2Ctx.canvas.toDataURL("image/png");66    document.getElementById('pixelmatch1').src = pixelmatchResult.canvas.toDataURL("image/png");67    // document.getElementById('pixelmatch2').src = pixelmatchResult.canvas.toDataURL("image/png");68    document.getElementById('lcsResult').src = lcsDiffResult.canvas.toDataURL("image/png");69}70/**71 * ========= HELPERS ========72 */73function getImgDataDataFromContext(context) {74    return context.getImageData(0, 0, context.canvas.width, context.canvas.height).data;75}76function getEmptyImgData(h, w) {77    var o = imageToCanvasContext(null, h, w);78    return o.createImageData(w, h);79}80function imageToCanvasContext(_img, w, h) {81    let img = _img;82    if (!_img) {83        img = { width: w, height: h };84    }85    const canvas = document.createElement("canvas");86    canvas.width = img.width;87    canvas.height = img.height;88    const context = canvas.getContext("2d");89    if (_img) {90        context.drawImage(img, 0, 0);91    }92    return context;93}94// function getEmptyImgContext(h, w) {95//     var o = imageToCanvasContext(null, h, w);96//     o.createImageData(w, h);97//     return o;...

Using AI Code Generation

1var imageToCanvasContext = require('image-to-canvas-context');2var fs = require('fs');3var Canvas = require('canvas');4var Image = Canvas.Image;5var image = new Image();6image.src = fs.readFileSync('test.jpg');7var imageContext = imageToCanvasContext(image);8var canvas = new Canvas(image.width, image.height);9var ctx = canvas.getContext('2d');10ctx.drawImage(imageContext.canvas, 0, 0, image.width, image.height);11ctx.globalCompositeOperation = 'source-in';12ctx.fillStyle = 'red';13ctx.fillRect(0, 0, image.width, image.height);14var out = fs.createWriteStream('test-out.jpg');15var stream = canvas.createJPEGStream();16stream.pipe(out);17out.on('finish', function() {18  console.log('done');19});20out.on('error', function(err) {21  console.log(err);22});23var imageToCanvasContext = require('image-to-canvas-context');24var fs = require('fs');25var Canvas = require('canvas');26var Image = Canvas.Image;27var image = new Image();28image.src = fs.readFileSync('test.jpg');29var imageContext = imageToCanvasContext(image);30var canvas = new Canvas(image.width, image.height);31var ctx = canvas.getContext('2d');32ctx.drawImage(imageContext.canvas, 0, 0, image.width, image.height);33ctx.globalAlpha = 1;34ctx.fillStyle = 'red';35ctx.fillRect(0, 0, image.width, image.height);36var out = fs.createWriteStream('test-out.jpg');37var stream = canvas.createJPEGStream();38stream.pipe(out);39out.on('finish', function() {40  console.log('done');41});42out.on('error', function(err) {43  console.log(err);44});

Using AI Code Generation

1var imageToCanvasContext = require('backstopjs').imageToCanvasContext;2var fs = require('fs');3var path = require('path');4var image = fs.readFileSync(path.join(__dirname, 'test.png'));5var canvas = imageToCanvasContext(image, 0, 0);6var ctx = canvas.getContext('2d');7ctx.fillStyle = 'red';8ctx.fillRect(0, 0, 100, 100);9var data = canvas.toDataURL();10fs.writeFileSync(path.join(__dirname, 'test2.png'), data.replace(/^data:image\/\w+;base64,/, ""), 'base64');

Using AI Code Generation

1var imageToCanvasContext = require('backstopjs').util.imageToCanvasContext;2var fs = require('fs');3var path = require('path');4var image1 = fs.readFileSync(path.join(__dirname, 'image1.jpg'));5var image2 = fs.readFileSync(path.join(__dirname, 'image2.jpg'));6var image1CanvasContext = imageToCanvasContext(image1);7var image2CanvasContext = imageToCanvasContext(image2);8var image1Data = image1CanvasContext.getImageData(0, 0, image1CanvasContext.canvas.width, image1CanvasContext.canvas.height).data;9var image2Data = image2CanvasContext.getImageData(0, 0, image2CanvasContext.canvas.width, image2CanvasContext.canvas.height).data;10var diff = require('imagediff');11var diffImage = diff.diff(image1Data, image2Data, image1CanvasContext.canvas.width, image1CanvasContext.canvas.height);12var diffImageData = diffImage.data;13var diffCanvasContext = imageToCanvasContext(diffImage);14var diffImageBuffer = new Buffer(diffCanvasContext.canvas.toDataURL().replace(/^data:image\/\w+;base64,/, ""), 'base64');15fs.writeFileSync(path.join(__dirname, 'diffImage.jpg'), diffImageBuffer);16{17    {18    },19    {20    },21    {22    },23    {24    },25    {26    }27    {

Using AI Code Generation

1var imageToCanvasContext = require('image-to-canvas-context');2var fs = require('fs');3var image = fs.readFileSync('test.png');4var canvasContext = imageToCanvasContext(image);5console.log(canvasContext);6{ canvas: 7   { width: 1920,8     style: {},9     _events: {},10     _currentShadowColor: 'rgba(0, 0, 0, 0)',

Using AI Code Generation

1var imageToCanvasContext = require('backstopjs').util.imageToCanvasContext;2var image = new Image();3image.src = './test.png';4image.onload = function () {5  var canvas = document.getElementById('canvas');6  var context = canvas.getContext('2d');7  context.drawImage(image, 0, 0, image.width, image.height);8  var imageData = context.getImageData(0, 0, image.width, image.height);9  var canvasContext = imageToCanvasContext(imageData);10  console.log(canvasContext);11};

Using AI Code Generation

1var imageToCanvasContext = require('backstopjs').core.util.imageToCanvasContext;2function getPixelColor(image, x, y) {3  var canvas = imageToCanvasContext(image);4  var pixelData = canvas.getImageData(x, y, 1, 1).data;5  return pixelData;6}7var image = require('backstopjs').core.util.image;8var image = image.read('test.png');9var pixelColor = getPixelColor(image, 10, 10);10console.log(pixelColor);11* **Garris** - *Initial work* - [Garris](

Using AI Code Generation

1var imageToCanvasContext = require('backstopjs/core/util/imageToCanvasContext');2var fs = require('fs');3var image = fs.readFileSync('test.png');4var canvas = imageToCanvasContext(image);5var out = fs.createWriteStream('test2.png');6var stream = canvas.pngStream();7stream.on('data', function(chunk){8  out.write(chunk);9});10stream.on('end', function(){11  console.log('saved png');12});

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