Merge branch 'master' of github.com:andreasgal/pdf.js
This commit is contained in:
Chris Jones
commit
470f0e49dd
239
pdf.js
239
pdf.js
@ -617,6 +617,19 @@ function IsRef(v) {
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return v instanceof Ref;
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}
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function IsPDFFunction(v) {
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var fnDict;
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if (typeof v != "object")
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return false;
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else if (IsDict(v))
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fnDict = v;
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else if (IsStream(v))
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fnDict = v.dict;
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else
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return false;
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return fnDict.has("FunctionType");
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}
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var EOF = {};
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function IsEOF(v) {
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@ -2055,16 +2068,16 @@ var CanvasGraphics = (function() {
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// Shading
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shadingFill: function(entryRef) {
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var shadingRes = this.res.get("Shading");
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var xref = this.xref;
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var res = this.res;
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var shadingRes = xref.fetchIfRef(res.get("Shading"));
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if (!shadingRes)
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return;
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shadingRes = this.xref.fetchIfRef(shadingRes);
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var shading = shadingRes.get(entryRef.name);
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error("No shading resource found");
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var shading = xref.fetchIfRef(shadingRes.get(entryRef.name));
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if (!shading)
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return;
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shading = this.xref.fetchIfRef(shading);
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if (!shading)
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return;
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error("No shading object found");
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this.save();
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@ -2075,32 +2088,30 @@ var CanvasGraphics = (function() {
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this.endPath();
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}
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var cs = shading.get2("ColorSpace", "CS");
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TODO("shading-fill color space");
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var type = shading.get("ShadingType");
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switch (type) {
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case 1:
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this.fillFunctionShading(shading);
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break;
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case 2:
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this.fillAxialShading(shading);
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break;
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case 3:
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this.fillRadialShading(shading);
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break;
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case 4: case 5: case 6: case 7:
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TODO("shading fill type "+ type);
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default:
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malformed("Unknown shading type "+ type);
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}
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var background = shading.get("Background");
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if (background)
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TODO("handle background colors");
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const types = [null, this.fillFunctionShading,
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this.fillAxialShading, this.fillRadialShading];
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var typeNum = shading.get("ShadingType");
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var fillFn = types[typeNum];
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if (!fillFn)
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error("Unknown type of shading");
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fillFn.apply(this, [shading]);
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this.restore();
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},
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fillAxialShading: function(sh) {
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var coordsArr = sh.get("Coords");
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var x0 = coordsArr[0], y0 = coordsArr[1],
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x1 = coordsArr[2], y1 = coordsArr[3];
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var t0 = 0.0, t1 = 1.0;
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if (sh.has("Domain")) {
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var domainArr = sh.get("Domain");
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@ -2111,19 +2122,30 @@ var CanvasGraphics = (function() {
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if (sh.has("Extend")) {
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var extendArr = sh.get("Extend");
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extendStart = extendArr[0], extendEnd = extendArr[1];
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TODO("Support extend");
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}
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var fn = sh.get("Function");
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fn = this.xref.fetchIfRef(fn);
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var fnObj = sh.get("Function");
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fnObj = this.xref.fetchIfRef(fnObj);
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if (IsArray(fnObj))
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error("No support for array of functions");
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else if (!IsPDFFunction(fnObj))
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error("Invalid function");
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fn = new PDFFunction(this.xref, fnObj);
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var gradient = this.ctx.createLinearGradient(x0, y0, x1, y1);
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gradient.addColorStop(0, 'rgb(0,0,255)');
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gradient.addColorStop(1, 'rgb(0,255,0)');
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var step = (t1 - t0) / 10;
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for (var i = t0; i <= t1; i += step) {
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var c = fn.func([i]);
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gradient.addColorStop(i, this.makeCssRgb.apply(this, c));
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}
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this.ctx.fillStyle = gradient;
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this.ctx.fill();
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this.consumePath();
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// HACK to draw the gradient onto an infinite rectangle.
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// PDF gradients are drawn across the entire image while
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// Canvas only allows gradients to be drawn in a rectangle
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this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
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},
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// Images
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@ -2471,3 +2493,154 @@ var ColorSpace = (function() {
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return constructor;
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})();
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var PDFFunction = (function() {
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function constructor(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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const types = [this.constructSampled, null,
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this.constructInterpolated, 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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typeFn.apply(this, [fn, dict]);
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};
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constructor.prototype = {
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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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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");
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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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this.func = 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");
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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 = [];
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for (var i = 0; i < outputSize; ++i) {
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if (ceil == floor) {
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var 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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var 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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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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var b;
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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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constructInterpolated: function() {
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error("unhandled type of function");
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},
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constructStiched: function() {
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error("unhandled type of function");
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},
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constructPostScript: function() {
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error("unhandled type of function");
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}
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};
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return constructor;
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})();
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