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Artur Adib
parent
b428552e87
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25 changed files with 7581 additions and 7588 deletions
300
src/function.js
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300
src/function.js
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var PDFFunction = (function() {
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var CONSTRUCT_SAMPLED = 0;
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var CONSTRUCT_INTERPOLATED = 2;
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var CONSTRUCT_STICHED = 3;
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var CONSTRUCT_POSTSCRIPT = 4;
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return {
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getSampleArray: function(size, outputSize, bps, str) {
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var length = 1;
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for (var i = 0; i < size.length; i++)
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length *= size[i];
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length *= outputSize;
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var array = [];
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var codeSize = 0;
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var codeBuf = 0;
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var strBytes = str.getBytes((length * bps + 7) / 8);
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var strIdx = 0;
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for (var i = 0; i < length; i++) {
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while (codeSize < bps) {
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codeBuf <<= 8;
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codeBuf |= strBytes[strIdx++];
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codeSize += 8;
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}
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codeSize -= bps;
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array.push(codeBuf >> codeSize);
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codeBuf &= (1 << codeSize) - 1;
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}
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return array;
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},
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getIR: function(xref, fn) {
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var dict = fn.dict;
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if (!dict)
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dict = fn;
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var types = [this.constructSampled,
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null,
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this.constructInterpolated,
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this.constructStiched,
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this.constructPostScript];
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var typeNum = dict.get('FunctionType');
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var typeFn = types[typeNum];
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if (!typeFn)
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error('Unknown type of function');
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return typeFn.call(this, fn, dict, xref);
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},
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fromIR: function(IR) {
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var type = IR[0];
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switch (type) {
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case CONSTRUCT_SAMPLED:
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return this.constructSampledFromIR(IR);
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case CONSTRUCT_INTERPOLATED:
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return this.constructInterpolatedFromIR(IR);
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case CONSTRUCT_STICHED:
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return this.constructStichedFromIR(IR);
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case CONSTRUCT_POSTSCRIPT:
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return this.constructPostScriptFromIR(IR);
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}
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},
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parse: function(xref, fn) {
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var IR = this.getIR(xref, fn);
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return this.fromIR(IR);
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},
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constructSampled: function(str, dict) {
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var domain = dict.get('Domain');
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var range = dict.get('Range');
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if (!domain || !range)
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error('No domain or range');
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var inputSize = domain.length / 2;
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var outputSize = range.length / 2;
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if (inputSize != 1)
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error('No support for multi-variable inputs to functions: ' +
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inputSize);
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var size = dict.get('Size');
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var bps = dict.get('BitsPerSample');
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var order = dict.get('Order');
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if (!order)
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order = 1;
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if (order !== 1)
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error('No support for cubic spline interpolation: ' + order);
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var encode = dict.get('Encode');
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if (!encode) {
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encode = [];
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for (var i = 0; i < inputSize; ++i) {
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encode.push(0);
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encode.push(size[i] - 1);
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}
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}
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var decode = dict.get('Decode');
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if (!decode)
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decode = range;
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var samples = this.getSampleArray(size, outputSize, bps, str);
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return [
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CONSTRUCT_SAMPLED, inputSize, domain, encode, decode, samples, size,
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outputSize, bps, range
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];
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},
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constructSampledFromIR: function(IR) {
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var inputSize = IR[1];
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var domain = IR[2];
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var encode = IR[3];
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var decode = IR[4];
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var samples = IR[5];
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var size = IR[6];
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var outputSize = IR[7];
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var bps = IR[8];
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var range = IR[9];
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return function(args) {
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var clip = function(v, min, max) {
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if (v > max)
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v = max;
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else if (v < min)
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v = min;
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return v;
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};
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if (inputSize != args.length)
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error('Incorrect number of arguments: ' + inputSize + ' != ' +
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args.length);
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for (var i = 0; i < inputSize; i++) {
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var i2 = i * 2;
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// clip to the domain
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var v = clip(args[i], domain[i2], domain[i2 + 1]);
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// encode
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v = encode[i2] + ((v - domain[i2]) *
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(encode[i2 + 1] - encode[i2]) /
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(domain[i2 + 1] - domain[i2]));
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// clip to the size
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args[i] = clip(v, 0, size[i] - 1);
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}
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// interpolate to table
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TODO('Multi-dimensional interpolation');
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var floor = Math.floor(args[0]);
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var ceil = Math.ceil(args[0]);
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var scale = args[0] - floor;
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floor *= outputSize;
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ceil *= outputSize;
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var output = [], v = 0;
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for (var i = 0; i < outputSize; ++i) {
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if (ceil == floor) {
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v = samples[ceil + i];
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} else {
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var low = samples[floor + i];
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var high = samples[ceil + i];
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v = low * scale + high * (1 - scale);
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}
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var i2 = i * 2;
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// decode
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v = decode[i2] + (v * (decode[i2 + 1] - decode[i2]) /
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((1 << bps) - 1));
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// clip to the domain
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output.push(clip(v, range[i2], range[i2 + 1]));
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}
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return output;
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}
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},
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constructInterpolated:
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function pdfFunctionConstructInterpolated(str, dict) {
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var c0 = dict.get('C0') || [0];
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var c1 = dict.get('C1') || [1];
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var n = dict.get('N');
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if (!isArray(c0) || !isArray(c1))
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error('Illegal dictionary for interpolated function');
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var length = c0.length;
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var diff = [];
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for (var i = 0; i < length; ++i)
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diff.push(c1[i] - c0[i]);
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return [CONSTRUCT_INTERPOLATED, c0, diff, n];
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},
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constructInterpolatedFromIR:
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function pdfFunctionconstructInterpolatedFromIR(IR) {
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var c0 = IR[1];
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var diff = IR[2];
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var n = IR[3];
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var length = diff.length;
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return function(args) {
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var x = n == 1 ? args[0] : Math.pow(args[0], n);
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var out = [];
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for (var j = 0; j < length; ++j)
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out.push(c0[j] + (x * diff[j]));
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return out;
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}
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},
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constructStiched: function pdfFunctionConstructStiched(fn, dict, xref) {
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var domain = dict.get('Domain');
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var range = dict.get('Range');
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if (!domain)
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error('No domain');
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var inputSize = domain.length / 2;
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if (inputSize != 1)
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error('Bad domain for stiched function');
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var fnRefs = dict.get('Functions');
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var fns = [];
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for (var i = 0, ii = fnRefs.length; i < ii; ++i)
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fns.push(PDFFunction.getIR(xref, xref.fetchIfRef(fnRefs[i])));
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var bounds = dict.get('Bounds');
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var encode = dict.get('Encode');
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return [CONSTRUCT_STICHED, domain, bounds, encode, fns];
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},
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constructStichedFromIR: function pdfFunctionConstructStichedFromIR(IR) {
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var domain = IR[1];
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var bounds = IR[2];
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var encode = IR[3];
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var fnsIR = IR[4];
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var fns = [];
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for (var i = 0; i < fnsIR.length; i++) {
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fns.push(PDFFunction.fromIR(fnsIR[i]));
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}
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return function(args) {
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var clip = function(v, min, max) {
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if (v > max)
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v = max;
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else if (v < min)
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v = min;
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return v;
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};
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// clip to domain
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var v = clip(args[0], domain[0], domain[1]);
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// calulate which bound the value is in
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for (var i = 0, ii = bounds.length; i < ii; ++i) {
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if (v < bounds[i])
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break;
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}
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// encode value into domain of function
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var dmin = domain[0];
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if (i > 0)
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dmin = bounds[i - 1];
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var dmax = domain[1];
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if (i < bounds.length)
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dmax = bounds[i];
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var rmin = encode[2 * i];
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var rmax = encode[2 * i + 1];
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var v2 = rmin + (v - dmin) * (rmax - rmin) / (dmax - dmin);
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// call the appropropriate function
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return fns[i]([v2]);
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};
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},
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constructPostScript: function pdfFunctionConstructPostScript() {
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return [CONSTRUCT_POSTSCRIPT];
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},
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constructPostScriptFromIR: function pdfFunctionConstructPostScriptFromIR() {
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TODO('unhandled type of function');
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return function() {
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return [255, 105, 180];
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};
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}
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};
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})();
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