KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use decodeAndClamp method in wpt

Best JavaScript code snippet using wpt

image.js

Source:image.js

...25  /**26   * Decode and clamp a value. The formula is different from the spec because we27   * don't decode to float range [0,1], we decode it in the [0,max] range.28   */29  function decodeAndClamp(value, addend, coefficient, max) {30    value = addend + value * coefficient;31    // Clamp the value to the range32    return value < 0 ? 0 : value > max ? max : value;33  }34  function PDFImage(xref, res, image, inline, smask) {35    this.image = image;36    if (image.getParams) {37      // JPX/JPEG2000 streams directly contain bits per component38      // and color space mode information.39      TODO('get params from actual stream');40      // var bits = ...41      // var colorspace = ...42    }43    // TODO cache rendered images?44    var dict = image.dict;45    this.width = dict.get('Width', 'W');46    this.height = dict.get('Height', 'H');47    if (this.width < 1 || this.height < 1)48      error('Invalid image width: ' + this.width + ' or height: ' +49            this.height);50    this.interpolate = dict.get('Interpolate', 'I') || false;51    this.imageMask = dict.get('ImageMask', 'IM') || false;52    var bitsPerComponent = image.bitsPerComponent;53    if (!bitsPerComponent) {54      bitsPerComponent = dict.get('BitsPerComponent', 'BPC');55      if (!bitsPerComponent) {56        if (this.imageMask)57          bitsPerComponent = 1;58        else59          error('Bits per component missing in image: ' + this.imageMask);60      }61    }62    this.bpc = bitsPerComponent;63    if (!this.imageMask) {64      var colorSpace = dict.get('ColorSpace', 'CS');65      if (!colorSpace) {66        TODO('JPX images (which don"t require color spaces');67        colorSpace = new Name('DeviceRGB');68      }69      this.colorSpace = ColorSpace.parse(colorSpace, xref, res);70      this.numComps = this.colorSpace.numComps;71    }72    this.decode = dict.get('Decode', 'D');73    this.needsDecode = false;74    if (this.decode && this.colorSpace &&75        !this.colorSpace.isDefaultDecode(this.decode)) {76      this.needsDecode = true;77      // Do some preprocessing to avoid more math.78      var max = (1 << bitsPerComponent) - 1;79      this.decodeCoefficients = [];80      this.decodeAddends = [];81      for (var i = 0, j = 0; i < this.decode.length; i += 2, ++j) {82        var dmin = this.decode[i];83        var dmax = this.decode[i + 1];84        this.decodeCoefficients[j] = dmax - dmin;85        this.decodeAddends[j] = max * dmin;86      }87    }88    var mask = xref.fetchIfRef(dict.get('Mask'));89    if (mask) {90      TODO('masked images');91    } else if (smask) {92      this.smask = new PDFImage(xref, res, smask, false);93    }94  }95  /**96   * Handles processing of image data and calls the callback with an argument97   * of a PDFImage when the image is ready to be used.98   */99  PDFImage.buildImage = function buildImage(callback, handler, xref, res,100                                               image, inline) {101    var imageDataPromise = new Promise();102    var smaskPromise = new Promise();103    // The image data and smask data may not be ready yet, wait till both are104    // resolved.105    Promise.all([imageDataPromise, smaskPromise]).then(function(results) {106      var imageData = results[0], smaskData = results[1];107      var image = new PDFImage(xref, res, imageData, inline, smaskData);108      callback(image);109    });110    handleImageData(handler, xref, res, image, imageDataPromise);111    var smask = xref.fetchIfRef(image.dict.get('SMask'));112    if (smask)113      handleImageData(handler, xref, res, smask, smaskPromise);114    else115      smaskPromise.resolve(null);116  };117  /**118   * Resize an image using the nearest neighbor algorithm.  Currently only119   * supports one and three component images.120   * @param {TypedArray} pixels The original image with one component.121   * @param {Number} bpc Number of bits per component.122   * @param {Number} components Number of color components, 1 or 3 is supported.123   * @param {Number} w1 Original width.124   * @param {Number} h1 Original height.125   * @param {Number} w2 New width.126   * @param {Number} h2 New height.127   * @return {TypedArray} Resized image data.128   */129  PDFImage.resize = function resize(pixels, bpc, components, w1, h1, w2, h2) {130    var length = w2 * h2 * components;131    var temp = bpc <= 8 ? new Uint8Array(length) :132        bpc <= 16 ? new Uint16Array(length) : new Uint32Array(length);133    var xRatio = w1 / w2;134    var yRatio = h1 / h2;135    var px, py, newIndex, oldIndex;136    for (var i = 0; i < h2; i++) {137      for (var j = 0; j < w2; j++) {138        px = Math.floor(j * xRatio);139        py = Math.floor(i * yRatio);140        newIndex = (i * w2) + j;141        oldIndex = ((py * w1) + px);142        if (components === 1) {143          temp[newIndex] = pixels[oldIndex];144        } else if (components === 3) {145          newIndex *= 3;146          oldIndex *= 3;147          temp[newIndex] = pixels[oldIndex];148          temp[newIndex + 1] = pixels[oldIndex + 1];149          temp[newIndex + 2] = pixels[oldIndex + 2];150        }151      }152    }153    return temp;154  };155  PDFImage.prototype = {156    get drawWidth() {157      if (!this.smask)158        return this.width;159      return Math.max(this.width, this.smask.width);160    },161    get drawHeight() {162      if (!this.smask)163        return this.height;164      return Math.max(this.height, this.smask.height);165    },166    getComponents: function getComponents(buffer) {167      var bpc = this.bpc;168      var needsDecode = this.needsDecode;169      var decodeMap = this.decode;170      // This image doesn't require any extra work.171      if (bpc == 8 && !needsDecode)172        return buffer;173      var bufferLength = buffer.length;174      var width = this.width;175      var height = this.height;176      var numComps = this.numComps;177      var length = width * height * numComps;178      var bufferPos = 0;179      var output = bpc <= 8 ? new Uint8Array(length) :180        bpc <= 16 ? new Uint16Array(length) : new Uint32Array(length);181      var rowComps = width * numComps;182      var decodeAddends, decodeCoefficients;183      if (needsDecode) {184        decodeAddends = this.decodeAddends;185        decodeCoefficients = this.decodeCoefficients;186      }187      var max = (1 << bpc) - 1;188      if (bpc == 8) {189        // Optimization for reading 8 bpc images that have a decode.190        for (var i = 0, ii = length; i < ii; ++i) {191          var compIndex = i % numComps;192          var value = buffer[i];193          value = decodeAndClamp(value, decodeAddends[compIndex],194                          decodeCoefficients[compIndex], max);195          output[i] = value;196        }197      } else if (bpc == 1) {198        // Optimization for reading 1 bpc images.199        var valueZero = 0, valueOne = 1;200        if (decodeMap) {201          valueZero = decodeMap[0] ? 1 : 0;202          valueOne = decodeMap[1] ? 1 : 0;203        }204        var mask = 0;205        var buf = 0;206        for (var i = 0, ii = length; i < ii; ++i) {207          if (i % rowComps == 0) {208            mask = 0;209            buf = 0;210          } else {211            mask >>= 1;212          }213          if (mask <= 0) {214            buf = buffer[bufferPos++];215            mask = 128;216          }217          output[i] = !(buf & mask) ? valueZero : valueOne;218        }219      } else {220        // The general case that handles all other bpc values.221        var bits = 0, buf = 0;222        for (var i = 0, ii = length; i < ii; ++i) {223          if (i % rowComps == 0) {224            buf = 0;225            bits = 0;226          }227          while (bits < bpc) {228            buf = (buf << 8) | buffer[bufferPos++];229            bits += 8;230          }231          var remainingBits = bits - bpc;232          var value = buf >> remainingBits;233          if (needsDecode) {234            var compIndex = i % numComps;235            value = decodeAndClamp(value, decodeAddends[compIndex],236                            decodeCoefficients[compIndex], max);237          }238          output[i] = value;239          buf = buf & ((1 << remainingBits) - 1);240          bits = remainingBits;241        }242      }243      return output;244    },245    getOpacity: function getOpacity(width, height) {246      var smask = this.smask;247      var originalWidth = this.width;248      var originalHeight = this.height;249      var buf;...

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var image = fs.readFileSync("test.jpg");4var decodedImage = wptools.decodeAndClamp(image);5fs.writeFileSync("decodedImage.jpg", decodedImage);6### wptools.decodeAndClamp(image, [callback])

Using AI Code Generation

1var wptools = require('wptools');2  if(err) console.log(err);3  else console.log(res);4});5### decodeAndClamp(url, callback)6MIT © [Nathan Pannell](

Using AI Code Generation

1var wptools = require('./wptools.js');2var wiki = new wptools();3var page = process.argv[2];4var property = process.argv[3];5wiki.decodeAndClamp(page, property, function(err, result) {6    if (err) {7        console.log(err);8    } else {9        console.log(result);10    }11});

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.