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added stiched functions

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sbarman 2011-08-16 18:15:20 -07:00
parent ac1000cc86
commit a48a74862a
1 changed files with 53 additions and 4 deletions
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57
pdf.js
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@ -5727,7 +5727,7 @@ var PDFFunction = (function() {
if (!typeFn)
error('Unknown type of function');
typeFn.call(this, fn, dict);
typeFn.call(this, fn, dict, xref);
};
constructor.prototype = {
@ -5872,9 +5872,58 @@ var PDFFunction = (function() {
return out;
}
},
constructStiched: function() {
TODO('unhandled type of function');
this.func = function() { return [255, 105, 180]; }
constructStiched: function(fn, dict, xref) {
var domain = dict.get('Domain');
var range = dict.get('Range');
if (!domain)
error('No domain');
var inputSize = domain.length / 2;
if (inputSize != 1)
error('Bad domain for stiched function');
var fnRefs = dict.get('Functions');
var fns = [];
for (var i = 0, ii = fnRefs.length; i < ii; ++i)
fns.push(new PDFFunction(xref, xref.fetchIfRef(fnRefs[i])));
var bounds = dict.get('Bounds');
var encode = dict.get('Encode');
this.func = function(args) {
var clip = function(v, min, max) {
if (v > max)
v = max;
else if (v < min)
v = min;
return v;
}
// clip to domain
var v = clip(args[0], domain[0], domain[1]);
// calulate which bound the value is in
for (var i = 0, ii = bounds.length; i < ii; ++i) {
if (v < bounds[i])
break;
}
// encode value into domain of function
var dmin = domain[0];
if (i > 0)
dmin = bounds[i - 1];
var dmax = domain[1];
if (i < bounds.length)
dmax = bounds[i];
var rmin = encode[2 * i];
var rmax = encode[2 * i + 1];
var v2 = rmin + (v - dmin) * (rmax - rmin) / (dmax - dmin);
// call the appropropriate function
return fns[i].func([v2]);
}
},
constructPostScript: function() {
TODO('unhandled type of function');