initial (broken) support for xobjects
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Chris Jones
parent
db6f072507
commit
8f8b302b23
92
pdf.js
92
pdf.js
@ -1,6 +1,5 @@
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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
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/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
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function warn(msg) {
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if (console && console.log)
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console.log(msg);
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@ -18,10 +17,11 @@ function shadow(obj, prop, value) {
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}
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var Stream = (function() {
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function constructor(arrayBuffer) {
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function constructor(arrayBuffer, dict) {
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this.bytes = new Uint8Array(arrayBuffer);
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this.pos = 0;
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this.start = 0;
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this.dict = dict;
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}
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constructor.prototype = {
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@ -58,11 +58,11 @@ var Stream = (function() {
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moveStart: function() {
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this.start = this.pos;
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},
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makeSubStream: function(pos, length) {
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makeSubStream: function(pos, length, dict) {
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var buffer = this.bytes.buffer;
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if (length)
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return new Stream(new Uint8Array(buffer, pos, length));
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return new Stream(new Uint8Array(buffer, pos));
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return new Stream(new Uint8Array(buffer, pos, length), dict);
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return new Stream(new Uint8Array(buffer, pos), dict);
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}
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};
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@ -1196,7 +1196,7 @@ var Lexer = (function() {
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case '\\':
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case '(':
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case ')':
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str += c;
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str += ch;
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break;
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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@ -1500,7 +1500,7 @@ var Parser = (function() {
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error("Missing 'endstream'");
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this.shift();
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stream = stream.makeSubStream(pos, length);
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stream = stream.makeSubStream(pos, length, dict);
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if (this.fileKey) {
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stream = new DecryptStream(stream,
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this.fileKey,
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@ -1813,30 +1813,11 @@ var Page = (function() {
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var mediaBox = xref.fetchIfRef(this.mediaBox);
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if (!IsStream(contents) || !IsDict(resources))
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error("invalid page contents or resources");
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gfx.resources = resources;
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gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
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width: mediaBox[2] - mediaBox[0],
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height: mediaBox[3] - mediaBox[1] });
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var args = [];
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var map = gfx.map;
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var parser = new Parser(new Lexer(contents), false);
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var obj;
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while (!IsEOF(obj = parser.getObj())) {
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if (IsCmd(obj)) {
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var cmd = obj.cmd;
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var fn = map[cmd];
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if (fn)
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// TODO figure out how to type-check vararg functions
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fn.apply(gfx, args);
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else
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error("Unknown command '" + cmd + "'");
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args.length = 0;
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} else {
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if (args.length > 33)
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error("Too many arguments '" + cmd + "'");
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args.push(obj);
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}
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}
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gfx.interpret(new Parser(new Lexer(contents), false),
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xref, resources);
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gfx.endDrawing();
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}
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};
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@ -2040,6 +2021,8 @@ var CanvasGraphics = (function() {
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this.current = new CanvasExtraState();
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this.stateStack = [ ];
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this.pendingClip = null;
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this.res = null;
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this.xobjs = null;
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this.map = {
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// Graphics state
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w: this.setLineWidth,
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@ -2115,6 +2098,38 @@ var CanvasGraphics = (function() {
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this.ctx.scale(cw / mediaBox.width, -ch / mediaBox.height);
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this.ctx.translate(0, -mediaBox.height);
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},
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interpret: function(parser, xref, resources) {
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var savedXref = this.xref, savedRes = this.res, savedXobjs = this.xobjs;
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this.xref = xref;
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this.res = resources || new Dict();
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this.xobjs = this.res.get("XObject") || new Dict();
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var args = [];
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var map = this.map;
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var obj;
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while (!IsEOF(obj = parser.getObj())) {
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if (IsCmd(obj)) {
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var cmd = obj.cmd;
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var fn = map[cmd];
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if (fn)
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// TODO figure out how to type-check vararg functions
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fn.apply(this, args);
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else
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error("Unknown command '" + cmd + "'");
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args.length = 0;
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} else {
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if (args.length > 33)
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error("Too many arguments '" + cmd + "'");
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args.push(obj);
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}
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}
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this.xobjs = savedXobjs;
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this.res = savedRes;
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this.xref = savedXref;
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},
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endDrawing: function() {
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this.ctx.restore();
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},
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@ -2144,8 +2159,11 @@ var CanvasGraphics = (function() {
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this.current = new CanvasExtraState();
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},
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restore: function() {
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this.current = this.stateStack.pop();
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this.ctx.restore();
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var prev = this.stateStack.pop();
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if (prev) {
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this.current = prev;
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this.ctx.restore();
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}
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},
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transform: function(a, b, c, d, e, f) {
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this.ctx.transform(a, b, c, d, e, f);
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@ -2207,7 +2225,9 @@ var CanvasGraphics = (function() {
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// TODO
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},
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setFont: function(fontRef, size) {
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var font = this.resources.get("Font").get(fontRef.name);
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var font = this.res.get("Font").get(fontRef.name);
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if (!font)
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return;
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this.current.fontSize = size;
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this.ctx.font = this.current.fontSize +'px '+ font.BaseFont;
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},
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@ -2282,7 +2302,15 @@ var CanvasGraphics = (function() {
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// XObjects
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paintXObject: function(obj) {
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// TODO
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var xobj = this.xobjs.get(obj.name);
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if (!xobj)
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return;
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xobj = this.xref.fetchIfRef(xobj);
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if (!IsStream(xobj))
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error("XObject should be a stream");
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this.interpret(new Parser(new Lexer(xobj), false),
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this.xref, xobj.dict.get("Resources"));
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},
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// Helper functions
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