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compile PDF command streams into JS code

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This commit is contained in:
Andreas Gal 2011-06-14 18:31:14 -07:00
parent bf2c525788
commit b9771416ba
1 changed files with 82 additions and 54 deletions
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136
pdf.js
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@ -1395,8 +1395,7 @@ var Page = (function() {
gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: mediaBox[2] - mediaBox[0],
height: mediaBox[3] - mediaBox[1] });
gfx.interpret(new Parser(new Lexer(contents), false),
xref, resources);
gfx.execute(contents, xref, resources);
gfx.endDrawing();
}
};
@ -1605,65 +1604,65 @@ var CanvasGraphics = (function() {
this.xobjs = null;
this.map = {
// Graphics state
w: this.setLineWidth,
J: this.setLineCap,
j: this.setLineJoin,
d: this.setDash,
ri: this.setRenderingIntent,
i: this.setFlatness,
gs: this.setGState,
q: this.save,
Q: this.restore,
cm: this.transform,
w: "setLineWidth",
J: "setLineCap",
j: "setLineJoin",
d: "setDash",
ri: "setRenderingIntent",
i: "setFlatness",
gs: "setGState",
q: "save",
Q: "restore",
cm: "transform",
// Path
m: this.moveTo,
l: this.lineTo,
c: this.curveTo,
h: this.closePath,
re: this.rectangle,
S: this.stroke,
f: this.fill,
"f*": this.eoFill,
B: this.fillStroke,
b: this.closeFillStroke,
n: this.endPath,
m: "moveTo",
l: "lineTo",
c: "curveTo",
h: "closePath",
re: "rectangle",
S: "stroke",
f: "fill",
"f*": "eoFill",
B: "fillStroke",
b: "closeFillStroke",
n: "endPath",
// Clipping
W: this.clip,
"W*": this.eoClip,
W: "clip",
"W*": "eoClip",
// Text
BT: this.beginText,
ET: this.endText,
TL: this.setLeading,
Tf: this.setFont,
Td: this.moveText,
Tm: this.setTextMatrix,
"T*": this.nextLine,
Tj: this.showText,
TJ: this.showSpacedText,
BT: "beginText",
ET: "endText",
TL: "setLeading",
Tf: "setFont",
Td: "moveText",
Tm: "setTextMatrix",
"T*": "nextLine",
Tj: "showText",
TJ: "showSpacedText",
// Type3 fonts
// Color
CS: this.setStrokeColorSpace,
cs: this.setFillColorSpace,
SC: this.setStrokeColor,
SCN: this.setStrokeColorN,
sc: this.setFillColor,
scn: this.setFillColorN,
G: this.setStrokeGray,
g: this.setFillGray,
RG: this.setStrokeRGBColor,
rg: this.setFillRGBColor,
CS: "setStrokeColorSpace",
cs: "setFillColorSpace",
SC: "setStrokeColor",
SCN: "setStrokeColorN",
sc: "setFillColor",
scn: "setFillColorN",
G: "setStrokeGray",
g: "setFillGray",
RG: "setStrokeRGBColor",
rg: "setFillRGBColor",
// Shading
sh: this.shadingFill,
sh: "shadingFill",
// Images
// XObjects
Do: this.paintXObject,
Do: "paintXObject",
// Marked content
// Compatibility
@ -1683,13 +1682,38 @@ var CanvasGraphics = (function() {
this.ctx.translate(0, -mediaBox.height);
},
interpret: function(parser, xref, resources) {
execute: function(stream, xref, resources) {
if (!stream.execute)
this.compile(stream, xref, resources);
var savedXref = this.xref, savedRes = this.res, savedXobjs = this.xobjs;
this.xref = xref;
this.res = resources || new Dict();
this.xobjs = this.res.get("XObject") || new Dict();
this.xobjs = this.xref.fetchIfRef(this.xobjs);
stream.execute(this, stream.objpool);
this.xobjs = savedXobjs;
this.res = savedRes;
this.xref = savedXref;
},
compile: function(stream, xref, resources) {
var parser = new Parser(new Lexer(stream), false);
var objpool = [];
function emitArg(arg) {
if (typeof arg == "object" || typeof arg == "string") {
var index = objpool.length;
objpool[index] = arg;
return "objpool[" + index + "]";
}
return arg;
}
var src = "{\n";
var args = [];
var map = this.map;
var obj;
@ -1699,7 +1723,12 @@ var CanvasGraphics = (function() {
var fn = map[cmd];
assertWellFormed(fn, "Unknown command '" + cmd + "'");
// TODO figure out how to type-check vararg functions
fn.apply(this, args);
src += "gfx.";
src += fn;
src += "(";
src += args.map(emitArg).join(",");
src += ");\n";
args.length = 0;
} else {
@ -1708,9 +1737,10 @@ var CanvasGraphics = (function() {
}
}
this.xobjs = savedXobjs;
this.res = savedRes;
this.xref = savedXref;
src += "}";
stream.execute = new Function("gfx", "objpool", src);
stream.objpool = objpool;
},
endDrawing: function() {
@ -2026,9 +2056,7 @@ var CanvasGraphics = (function() {
this.clip();
this.endPath();
}
this.interpret(new Parser(new Lexer(form), false),
this.xref, form.dict.get("Resources"));
this.execute(form, this.xref, form.dict.get("Resources"));
this.restore();
},