How to use decodeType5Shading method in wpt

Best JavaScript code snippet using wpt

pattern.js

Source:pattern.js

...321      coords: psPacked,322      colors: psPacked323    });324  }325  function decodeType5Shading(mesh, reader, verticesPerRow) {326    var coords = mesh.coords;327    var colors = mesh.colors;328    var ps = []; // not maintaining cs since that will match ps329    while (reader.hasData) {330      var coord = reader.readCoordinate();331      var color = reader.readComponents();332      ps.push(coords.length);333      coords.push(coord);334      colors.push(color);335    }336    var psPacked = new Int32Array(ps);337    mesh.figures.push({338      type: 'lattice',339      coords: psPacked,340      colors: psPacked,341      verticesPerRow: verticesPerRow342    });343  }344  var MIN_SPLIT_PATCH_CHUNKS_AMOUNT = 3;345  var MAX_SPLIT_PATCH_CHUNKS_AMOUNT = 20;346  var TRIANGLE_DENSITY = 20; // count of triangles per entire mesh bounds347  var getB = (function getBClosure() {348    function buildB(count) {349      var lut = [];350      for (var i = 0; i <= count; i++) {351        var t = i / count, t_ = 1 - t;352        lut.push(new Float32Array([t_ * t_ * t_, 3 * t * t_ * t_,353          3 * t * t * t_, t * t * t]));354      }355      return lut;356    }357    var cache = [];358    return function getB(count) {359      if (!cache[count]) {360        cache[count] = buildB(count);361      }362      return cache[count];363    };364  })();365  function buildFigureFromPatch(mesh, index) {366    var figure = mesh.figures[index];367    assert(figure.type === 'patch', 'Unexpected patch mesh figure');368    var coords = mesh.coords, colors = mesh.colors;369    var pi = figure.coords;370    var ci = figure.colors;371    var figureMinX = Math.min(coords[pi[0]][0], coords[pi[3]][0],372                              coords[pi[12]][0], coords[pi[15]][0]);373    var figureMinY = Math.min(coords[pi[0]][1], coords[pi[3]][1],374                              coords[pi[12]][1], coords[pi[15]][1]);375    var figureMaxX = Math.max(coords[pi[0]][0], coords[pi[3]][0],376                              coords[pi[12]][0], coords[pi[15]][0]);377    var figureMaxY = Math.max(coords[pi[0]][1], coords[pi[3]][1],378                              coords[pi[12]][1], coords[pi[15]][1]);379    var splitXBy = Math.ceil((figureMaxX - figureMinX) * TRIANGLE_DENSITY /380                             (mesh.bounds[2] - mesh.bounds[0]));381    splitXBy = Math.max(MIN_SPLIT_PATCH_CHUNKS_AMOUNT,382               Math.min(MAX_SPLIT_PATCH_CHUNKS_AMOUNT, splitXBy));383    var splitYBy = Math.ceil((figureMaxY - figureMinY) * TRIANGLE_DENSITY /384                             (mesh.bounds[3] - mesh.bounds[1]));385    splitYBy = Math.max(MIN_SPLIT_PATCH_CHUNKS_AMOUNT,386               Math.min(MAX_SPLIT_PATCH_CHUNKS_AMOUNT, splitYBy));387    var verticesPerRow = splitXBy + 1;388    var figureCoords = new Int32Array((splitYBy + 1) * verticesPerRow);389    var figureColors = new Int32Array((splitYBy + 1) * verticesPerRow);390    var k = 0;391    var cl = new Uint8Array(3), cr = new Uint8Array(3);392    var c0 = colors[ci[0]], c1 = colors[ci[1]],393      c2 = colors[ci[2]], c3 = colors[ci[3]];394    var bRow = getB(splitYBy), bCol = getB(splitXBy);395    for (var row = 0; row <= splitYBy; row++) {396      cl[0] = ((c0[0] * (splitYBy - row) + c2[0] * row) / splitYBy) | 0;397      cl[1] = ((c0[1] * (splitYBy - row) + c2[1] * row) / splitYBy) | 0;398      cl[2] = ((c0[2] * (splitYBy - row) + c2[2] * row) / splitYBy) | 0;399      cr[0] = ((c1[0] * (splitYBy - row) + c3[0] * row) / splitYBy) | 0;400      cr[1] = ((c1[1] * (splitYBy - row) + c3[1] * row) / splitYBy) | 0;401      cr[2] = ((c1[2] * (splitYBy - row) + c3[2] * row) / splitYBy) | 0;402      for (var col = 0; col <= splitXBy; col++, k++) {403        if ((row === 0 || row === splitYBy) &&404            (col === 0 || col === splitXBy)) {405          continue;406        }407        var x = 0, y = 0;408        var q = 0;409        for (var i = 0; i <= 3; i++) {410          for (var j = 0; j <= 3; j++, q++) {411            var m = bRow[row][i] * bCol[col][j];412            x += coords[pi[q]][0] * m;413            y += coords[pi[q]][1] * m;414          }415        }416        figureCoords[k] = coords.length;417        coords.push([x, y]);418        figureColors[k] = colors.length;419        var newColor = new Uint8Array(3);420        newColor[0] = ((cl[0] * (splitXBy - col) + cr[0] * col) / splitXBy) | 0;421        newColor[1] = ((cl[1] * (splitXBy - col) + cr[1] * col) / splitXBy) | 0;422        newColor[2] = ((cl[2] * (splitXBy - col) + cr[2] * col) / splitXBy) | 0;423        colors.push(newColor);424      }425    }426    figureCoords[0] = pi[0];427    figureColors[0] = ci[0];428    figureCoords[splitXBy] = pi[3];429    figureColors[splitXBy] = ci[1];430    figureCoords[verticesPerRow * splitYBy] = pi[12];431    figureColors[verticesPerRow * splitYBy] = ci[2];432    figureCoords[verticesPerRow * splitYBy + splitXBy] = pi[15];433    figureColors[verticesPerRow * splitYBy + splitXBy] = ci[3];434    mesh.figures[index] = {435      type: 'lattice',436      coords: figureCoords,437      colors: figureColors,438      verticesPerRow: verticesPerRow439    };440  }441  function decodeType6Shading(mesh, reader) {442    // A special case of Type 7. The p11, p12, p21, p22 automatically filled443    var coords = mesh.coords;444    var colors = mesh.colors;445    var ps = new Int32Array(16); // p00, p10, ..., p30, p01, ..., p33446    var cs = new Int32Array(4); // c00, c30, c03, c33447    while (reader.hasData) {448      var f = reader.readFlag();449      assert(0 <= f && f <= 3, 'Unknown type6 flag');450      var i, ii;451      var pi = coords.length;452      for (i = 0, ii = (f !== 0 ? 8 : 12); i < ii; i++) {453        coords.push(reader.readCoordinate());454      }455      var ci = colors.length;456      for (i = 0, ii = (f !== 0 ? 2 : 4); i < ii; i++) {457        colors.push(reader.readComponents());458      }459      var tmp1, tmp2, tmp3, tmp4;460      switch (f) {461        case 0:462          ps[12] = pi + 3; ps[13] = pi + 4;  ps[14] = pi + 5;  ps[15] = pi + 6;463          ps[ 8] = pi + 2; /* values for 5, 6, 9, 10 are    */ ps[11] = pi + 7;464          ps[ 4] = pi + 1; /* calculated below              */ ps[ 7] = pi + 8;465          ps[ 0] = pi;     ps[ 1] = pi + 11; ps[ 2] = pi + 10; ps[ 3] = pi + 9;466          cs[2] = ci + 1; cs[3] = ci + 2;467          cs[0] = ci;     cs[1] = ci + 3;468          break;469        case 1:470          tmp1 = ps[12]; tmp2 = ps[13]; tmp3 = ps[14]; tmp4 = ps[15];471          ps[12] = pi + 5; ps[13] = pi + 4;  ps[14] = pi + 3;  ps[15] = pi + 2;472          ps[ 8] = pi + 6; /* values for 5, 6, 9, 10 are    */ ps[11] = pi + 1;473          ps[ 4] = pi + 7; /* calculated below              */ ps[ 7] = pi;474          ps[ 0] = tmp1;   ps[ 1] = tmp2;    ps[ 2] = tmp3;    ps[ 3] = tmp4;475          tmp1 = cs[2]; tmp2 = cs[3];476          cs[2] = ci + 1; cs[3] = ci;477          cs[0] = tmp1;   cs[1] = tmp2;478          break;479        case 2:480          ps[12] = ps[15]; ps[13] = pi + 7; ps[14] = pi + 6;   ps[15] = pi + 5;481          ps[ 8] = ps[11]; /* values for 5, 6, 9, 10 are    */ ps[11] = pi + 4;482          ps[ 4] = ps[7];  /* calculated below              */ ps[ 7] = pi + 3;483          ps[ 0] = ps[3];  ps[ 1] = pi;     ps[ 2] = pi + 1;   ps[ 3] = pi + 2;484          cs[2] = cs[3]; cs[3] = ci + 1;485          cs[0] = cs[1]; cs[1] = ci;486          break;487        case 3:488          ps[12] = ps[0];  ps[13] = ps[1];   ps[14] = ps[2];   ps[15] = ps[3];489          ps[ 8] = pi;     /* values for 5, 6, 9, 10 are    */ ps[11] = pi + 7;490          ps[ 4] = pi + 1; /* calculated below              */ ps[ 7] = pi + 6;491          ps[ 0] = pi + 2; ps[ 1] = pi + 3;  ps[ 2] = pi + 4;  ps[ 3] = pi + 5;492          cs[2] = cs[0]; cs[3] = cs[1];493          cs[0] = ci;    cs[1] = ci + 1;494          break;495      }496      // set p11, p12, p21, p22497      ps[5] = coords.length;498      coords.push([499        (-4 * coords[ps[0]][0] - coords[ps[15]][0] +500          6 * (coords[ps[4]][0] + coords[ps[1]][0]) -501          2 * (coords[ps[12]][0] + coords[ps[3]][0]) +502          3 * (coords[ps[13]][0] + coords[ps[7]][0])) / 9,503        (-4 * coords[ps[0]][1] - coords[ps[15]][1] +504          6 * (coords[ps[4]][1] + coords[ps[1]][1]) -505          2 * (coords[ps[12]][1] + coords[ps[3]][1]) +506          3 * (coords[ps[13]][1] + coords[ps[7]][1])) / 9507      ]);508      ps[6] = coords.length;509      coords.push([510        (-4 * coords[ps[3]][0] - coords[ps[12]][0] +511          6 * (coords[ps[2]][0] + coords[ps[7]][0]) -512          2 * (coords[ps[0]][0] + coords[ps[15]][0]) +513          3 * (coords[ps[4]][0] + coords[ps[14]][0])) / 9,514        (-4 * coords[ps[3]][1] - coords[ps[12]][1] +515          6 * (coords[ps[2]][1] + coords[ps[7]][1]) -516          2 * (coords[ps[0]][1] + coords[ps[15]][1]) +517          3 * (coords[ps[4]][1] + coords[ps[14]][1])) / 9518      ]);519      ps[9] = coords.length;520      coords.push([521        (-4 * coords[ps[12]][0] - coords[ps[3]][0] +522          6 * (coords[ps[8]][0] + coords[ps[13]][0]) -523          2 * (coords[ps[0]][0] + coords[ps[15]][0]) +524          3 * (coords[ps[11]][0] + coords[ps[1]][0])) / 9,525        (-4 * coords[ps[12]][1] - coords[ps[3]][1] +526          6 * (coords[ps[8]][1] + coords[ps[13]][1]) -527          2 * (coords[ps[0]][1] + coords[ps[15]][1]) +528          3 * (coords[ps[11]][1] + coords[ps[1]][1])) / 9529      ]);530      ps[10] = coords.length;531      coords.push([532        (-4 * coords[ps[15]][0] - coords[ps[0]][0] +533          6 * (coords[ps[11]][0] + coords[ps[14]][0]) -534          2 * (coords[ps[12]][0] + coords[ps[3]][0]) +535          3 * (coords[ps[2]][0] + coords[ps[8]][0])) / 9,536        (-4 * coords[ps[15]][1] - coords[ps[0]][1] +537          6 * (coords[ps[11]][1] + coords[ps[14]][1]) -538          2 * (coords[ps[12]][1] + coords[ps[3]][1]) +539          3 * (coords[ps[2]][1] + coords[ps[8]][1])) / 9540      ]);541      mesh.figures.push({542        type: 'patch',543        coords: new Int32Array(ps), // making copies of ps and cs544        colors: new Int32Array(cs)545      });546    }547  }548  function decodeType7Shading(mesh, reader) {549    var coords = mesh.coords;550    var colors = mesh.colors;551    var ps = new Int32Array(16); // p00, p10, ..., p30, p01, ..., p33552    var cs = new Int32Array(4); // c00, c30, c03, c33553    while (reader.hasData) {554      var f = reader.readFlag();555      assert(0 <= f && f <= 3, 'Unknown type7 flag');556      var i, ii;557      var pi = coords.length;558      for (i = 0, ii = (f !== 0 ? 12 : 16); i < ii; i++) {559        coords.push(reader.readCoordinate());560      }561      var ci = colors.length;562      for (i = 0, ii = (f !== 0 ? 2 : 4); i < ii; i++) {563        colors.push(reader.readComponents());564      }565      var tmp1, tmp2, tmp3, tmp4;566      switch (f) {567        case 0:568          ps[12] = pi + 3; ps[13] = pi + 4;  ps[14] = pi + 5;  ps[15] = pi + 6;569          ps[ 8] = pi + 2; ps[ 9] = pi + 13; ps[10] = pi + 14; ps[11] = pi + 7;570          ps[ 4] = pi + 1; ps[ 5] = pi + 12; ps[ 6] = pi + 15; ps[ 7] = pi + 8;571          ps[ 0] = pi;     ps[ 1] = pi + 11; ps[ 2] = pi + 10; ps[ 3] = pi + 9;572          cs[2] = ci + 1; cs[3] = ci + 2;573          cs[0] = ci;     cs[1] = ci + 3;574          break;575        case 1:576          tmp1 = ps[12]; tmp2 = ps[13]; tmp3 = ps[14]; tmp4 = ps[15];577          ps[12] = pi + 5; ps[13] = pi + 4;  ps[14] = pi + 3;  ps[15] = pi + 2;578          ps[ 8] = pi + 6; ps[ 9] = pi + 11; ps[10] = pi + 10; ps[11] = pi + 1;579          ps[ 4] = pi + 7; ps[ 5] = pi + 8;  ps[ 6] = pi + 9;  ps[ 7] = pi;580          ps[ 0] = tmp1;   ps[ 1] = tmp2;    ps[ 2] = tmp3;    ps[ 3] = tmp4;581          tmp1 = cs[2]; tmp2 = cs[3];582          cs[2] = ci + 1; cs[3] = ci;583          cs[0] = tmp1;   cs[1] = tmp2;584          break;585        case 2:586          ps[12] = ps[15]; ps[13] = pi + 7; ps[14] = pi + 6;  ps[15] = pi + 5;587          ps[ 8] = ps[11]; ps[ 9] = pi + 8; ps[10] = pi + 11; ps[11] = pi + 4;588          ps[ 4] = ps[7];  ps[ 5] = pi + 9; ps[ 6] = pi + 10; ps[ 7] = pi + 3;589          ps[ 0] = ps[3];  ps[ 1] = pi;     ps[ 2] = pi + 1;  ps[ 3] = pi + 2;590          cs[2] = cs[3]; cs[3] = ci + 1;591          cs[0] = cs[1]; cs[1] = ci;592          break;593        case 3:594          ps[12] = ps[0];  ps[13] = ps[1];   ps[14] = ps[2];   ps[15] = ps[3];595          ps[ 8] = pi;     ps[ 9] = pi + 9;  ps[10] = pi + 8;  ps[11] = pi + 7;596          ps[ 4] = pi + 1; ps[ 5] = pi + 10; ps[ 6] = pi + 11; ps[ 7] = pi + 6;597          ps[ 0] = pi + 2; ps[ 1] = pi + 3;  ps[ 2] = pi + 4;  ps[ 3] = pi + 5;598          cs[2] = cs[0]; cs[3] = cs[1];599          cs[0] = ci;    cs[1] = ci + 1;600          break;601      }602      mesh.figures.push({603        type: 'patch',604        coords: new Int32Array(ps), // making copies of ps and cs605        colors: new Int32Array(cs)606      });607    }608  }609  function updateBounds(mesh) {610    var minX = mesh.coords[0][0], minY = mesh.coords[0][1],611      maxX = minX, maxY = minY;612    for (var i = 1, ii = mesh.coords.length; i < ii; i++) {613      var x = mesh.coords[i][0], y = mesh.coords[i][1];614      minX = minX > x ? x : minX;615      minY = minY > y ? y : minY;616      maxX = maxX < x ? x : maxX;617      maxY = maxY < y ? y : maxY;618    }619    mesh.bounds = [minX, minY, maxX, maxY];620  }621  function packData(mesh) {622    var i, ii, j, jj;623    var coords = mesh.coords;624    var coordsPacked = new Float32Array(coords.length * 2);625    for (i = 0, j = 0, ii = coords.length; i < ii; i++) {626      var xy = coords[i];627      coordsPacked[j++] = xy[0];628      coordsPacked[j++] = xy[1];629    }630    mesh.coords = coordsPacked;631    var colors = mesh.colors;632    var colorsPacked = new Uint8Array(colors.length * 3);633    for (i = 0, j = 0, ii = colors.length; i < ii; i++) {634      var c = colors[i];635      colorsPacked[j++] = c[0];636      colorsPacked[j++] = c[1];637      colorsPacked[j++] = c[2];638    }639    mesh.colors = colorsPacked;640    var figures = mesh.figures;641    for (i = 0, ii = figures.length; i < ii; i++) {642      var figure = figures[i], ps = figure.coords, cs = figure.colors;643      for (j = 0, jj = ps.length; j < jj; j++) {644        ps[j] *= 2;645        cs[j] *= 3;646      }647    }648  }649  function Mesh(stream, matrix, xref, res) {650    assert(isStream(stream), 'Mesh data is not a stream');651    var dict = stream.dict;652    this.matrix = matrix;653    this.shadingType = dict.get('ShadingType');654    this.type = 'Pattern';655    this.bbox = dict.get('BBox');656    var cs = dict.get('ColorSpace', 'CS');657    cs = ColorSpace.parse(cs, xref, res);658    this.cs = cs;659    this.background = dict.has('Background') ?660      cs.getRgb(dict.get('Background'), 0) : null;661    var fnObj = dict.get('Function');662    var fn = fnObj ? PDFFunction.parseArray(xref, fnObj) : null;663    this.coords = [];664    this.colors = [];665    this.figures = [];666    var decodeContext = {667      bitsPerCoordinate: dict.get('BitsPerCoordinate'),668      bitsPerComponent: dict.get('BitsPerComponent'),669      bitsPerFlag: dict.get('BitsPerFlag'),670      decode: dict.get('Decode'),671      colorFn: fn,672      colorSpace: cs,673      numComps: fn ? 1 : cs.numComps674    };675    var reader = new MeshStreamReader(stream, decodeContext);676    var patchMesh = false;677    switch (this.shadingType) {678      case PatternType.FREE_FORM_MESH:679        decodeType4Shading(this, reader);680        break;681      case PatternType.LATTICE_FORM_MESH:682        var verticesPerRow = dict.get('VerticesPerRow') | 0;683        assert(verticesPerRow >= 2, 'Invalid VerticesPerRow');684        decodeType5Shading(this, reader, verticesPerRow);685        break;686      case PatternType.COONS_PATCH_MESH:687        decodeType6Shading(this, reader);688        patchMesh = true;689        break;690      case PatternType.TENSOR_PATCH_MESH:691        decodeType7Shading(this, reader);692        patchMesh = true;693        break;694      default:695        error('Unsupported mesh type.');696        break;697    }698    if (patchMesh) {...

Using AI Code Generation

1var wpt = require('./wpt.js');2var fs = require('fs');3var path = require('path');4var pdf = fs.readFileSync(path.join(__dirname, 'test.pdf'));5var result = wpt.decodeType5Shading(pdf, 0, 0, 0, 0, 0, 0);6console.log(result);

Using AI Code Generation

1var wptools = require("wptools");2var fs = require("fs");3var pdf = require("pdfkit");4var doc = new pdf();5var stream = fs.createWriteStream("test.pdf");6doc.pipe(stream);7var data = fs.readFileSync("test.png");8var buf = new Buffer(data);9wptools.decodeType5Shading(buf, function(err, data) {10  if (err) {11    console.log(err);12  } else {13    doc.image(data, 0, 0, { width: 500, height: 500 });14    doc.end();15  }16});17### decodeType5Shading(buf, callback)

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var data = fs.readFileSync('test.pdf');4var pdf = new wptools.PDF(data);5var result = pdf.decodeType5Shading(0);6console.log(result);7[MIT](LICENSE)

Using AI Code Generation

1var fs = require('fs');2var wptools = require('./wptools.js');3var file = fs.readFileSync('./test.pdf');4var pdf = new wptools.PDFDocument(file);5var content = pdf.getPageContent(1);6var xobjects = pdf.getXObjects(content);7var shading = pdf.getShading(xobjects[0].shading);8var decoded = wptools.decodeType5Shading(shading, 0, 0, 100, 100, 100, 100);9console.log(decoded);

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