cache refs, not streams, in the interest of saving memory
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Andreas Gal
parent
284ef90e47
commit
bffedbb33c
119
pdf.js
119
pdf.js
@ -1731,6 +1731,11 @@ var XRef = (function() {
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error("reading an XRef stream not implemented yet");
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return e;
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},
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fetchIfRef: function(obj) {
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if (!IsRef(obj))
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return obj;
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return this.fetch(obj);
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},
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fetch: function(ref) {
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var num = ref.num;
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var e = this.cache[num];
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@ -1781,18 +1786,10 @@ var Page = (function() {
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constructor.prototype = {
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get contents() {
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var obj = this.pageDict.get("Contents");
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if (IsRef(obj))
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obj = this.xref.fetch(obj);
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if (!IsStream(obj))
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error("invalid page contents object");
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return this.contents = obj;
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return this.contents = this.pageDict.get("Contents");
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},
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get resources() {
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var obj = this.pageDict.get("Resources");
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if (IsRef(obj))
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obj = this.xref.fetch(obj);
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return this.resources = (IsDict(obj) ? obj : null);
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get resources() {
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return this.resources = this.pageDict.get("Resources");
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},
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get mediaBox() {
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var obj = this.pageDict.get("MediaBox");
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@ -1800,13 +1797,18 @@ var Page = (function() {
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? obj
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: null);
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},
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display: function() {
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var stream = this.contents;
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var parser = new Parser(new Lexer(stream), false);
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display: function(start, process) {
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var xref = this.xref;
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var contents = xref.fetchIfRef(this.contents);
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var resources = xref.fetchIfRef(this.resources);
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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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start(resources, mediaBox);
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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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print(uneval(obj));
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}
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while (!IsEOF(obj = parser.getObj()))
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process(obj);
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}
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};
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@ -1987,12 +1989,8 @@ var PDFDoc = (function() {
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})();
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var Interpreter = (function() {
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function constructor(xref, resources, catalog, gfx) {
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this.xref = xref;
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this.res = resources;
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this.catalog = catalog;
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function constructor(gfx) {
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this.gfx = gfx;
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var env = this;
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this.map = {
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// Graphics state
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w: gfx.setLineWidth,
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@ -2025,11 +2023,7 @@ var Interpreter = (function() {
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// Text
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BT: gfx.beginText,
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ET: gfx.endText,
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Tf: function(fontRef, size) {
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var font = env.res.get("Font").get(fontRef.name);
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//alert(uneval(font));
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gfx.setFont(font, size);
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},
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Tf: gfx.setFont,
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Td: gfx.moveText,
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Tm: gfx.setTextMatrix,
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Tj: gfx.showText,
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@ -2061,35 +2055,34 @@ var Interpreter = (function() {
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}
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constructor.prototype = {
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compile: function(parser) {
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},
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interpret: function(obj) {
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return this.interpretHelper(new Parser(new Lexer(obj), true));
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},
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interpretHelper: function(mediaBox, parser) {
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this.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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interpret: function(page) {
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var gfx = this.gfx;
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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(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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var args = [];
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page.display(
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function(resources, mediaBox) {
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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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},
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function(obj) {
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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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}
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);
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this.gfx.endDrawing();
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}
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};
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@ -2197,7 +2190,8 @@ var EchoGraphics = (function() {
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this.dedent();
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this.printdentln("ET");
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},
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setFont: function(font, size) {
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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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this.printdentln("/"+ font.name +" "+ size +" Tf");
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},
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moveText: function (x, y) {
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@ -2428,7 +2422,8 @@ var CanvasGraphics = (function() {
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endText: function() {
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// TODO
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},
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setFont: function(font, size) {
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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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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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@ -2525,20 +2520,6 @@ var CanvasGraphics = (function() {
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return constructor;
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})();
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function runEchoTests() {
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tests.forEach(function(test) {
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putstr("Running echo test '"+ test.name +"'... ");
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var output = "";
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var gfx = new EchoGraphics(output);
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var i = new Interpreter(null, test.res, null, gfx);
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i.interpretHelper(test.mediaBox, new MockParser(test.objs));
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print("done. Output:");
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print(gfx.out);
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});
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}
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function runParseTests() {
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//var data = snarf("simple_graphics.pdf", "binary");
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var data = snarf("/tmp/paper.pdf", "binary");
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@ -52,10 +52,8 @@ function displayPage(num) {
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ctx.restore();
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var gfx = new CanvasGraphics(ctx);
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var interp = new Interpreter(null, page.resources, null, gfx);
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var stream = page.contents;
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var parser = new Parser(new Lexer(stream), false);
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interp.interpretHelper(page.mediaBox, parser);
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var interp = new Interpreter(gfx);
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interp.interpret(page);
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}
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function nextPage() {
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