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});

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