tighten up the interpreter loop

This commit is contained in:
Andreas Gal 2011-05-06 18:15:51 -07:00
parent 36f657b4ad
commit d65ebb7533

254
pdf.js
View File

@ -808,111 +808,9 @@ var Interpreter = (function() {
this.gfx = graphics;
}
const MAX_ARGS = 33;
const CMD_TABLE = {
// Graphics state
w : { params: [ "Num" ],
op: function(args) {
this.gfx.setLineWidth(args[0]);
} },
d : { params: [ "Array", "Num" ],
op: function(args) {
this.gfx.setDash(args[0], args[1]);
} },
q : { params: [ ],
op: function(args) {
this.gfx.save();
} },
Q : { params: [ ],
op: function(args) {
this.gfx.restore();
} },
cm: { params: [ "Num", "Num", "Num", "Num", "Num", "Num" ],
op: function(args) {
this.gfx.transform(args[0], args[1], args[2], args[3], args[4], args[5]);
} },
// Path
m : { params: [ "Num", "Num" ],
op: function(args) {
this.gfx.moveTo(args[0], args[1]);
} },
l : { params: [ "Num", "Num" ],
op: function(args) {
this.gfx.lineTo(args[0], args[1]);
} },
c : { params: [ "Num", "Num", "Num", "Num", "Num", "Num" ],
op: function(args) {
this.gfx.curveTo(args[0], args[1], args[2], args[3], args[4], args[5]);
} },
h : { params: [ ],
op: function(args) {
this.gfx.closePath();
} },
re: { params: [ "Num", "Num", "Num", "Num" ],
op: function(args) {
this.gfx.rectangle(args[0], args[1], args[2], args[3]);
} },
S : { params: [ ],
op: function(args) {
this.gfx.stroke();
} },
f : { params: [ ],
op: function(args) {
this.gfx.fill();
} },
B : { params: [ ],
op: function(args) {
this.gfx.fillStroke();
} },
b : { params: [ ],
op: function(args) {
this.gfx.closeFillStroke();
} },
// Clipping
// Text
BT: { params: [ ],
op: function(args) {
this.gfx.beginText();
} },
ET: { params: [ ],
op: function(args) {
this.gfx.endText();
} },
Tf: { params: [ "Name", "Num" ],
op: function(args) {
var font = this.res.Font[args[0]];
this.gfx.setFont(font, args[1]);
} },
Td: { params: [ "Num", "Num" ],
op: function(args) {
this.gfx.moveText(args[0], args[1]);
} },
Tj: { params: [ "String" ],
op: function(args) {
this.gfx.showText(args[0]);
} },
// Type3 fonts
// Color
g : { params: [ "Num" ],
op: function(args) {
this.gfx.setFillGray(args[0]);
} },
RG: { params: [ "Num", "Num", "Num" ],
op: function(args) {
this.gfx.setStrokeRGBColor(args[0], args[1], args[2]);
} },
rg: { params: [ "Num", "Num", "Num" ],
op: function(args) {
this.gfx.setFillRGBColor(args[0], args[1], args[2]);
} },
// Shading
// Images
// XObjects
// Marked content
// Compatibility
};
constructor.prototype = {
compile: function(parser) {
},
interpret: function(obj) {
return this.interpretHelper(new Parser(new Lexer(obj), true));
},
@ -920,38 +818,26 @@ var Interpreter = (function() {
this.gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: mediaBox[2] - mediaBox[0],
height: mediaBox[3] - mediaBox[1] });
var args = [ ];
var args = [];
var gfx = this.gfx;
var obj;
while (!IsEOF(obj = parser.getObj())) {
if (IsCmd(obj)) {
var cmd = obj.cmd;
if (!(cmd in CMD_TABLE))
this.error("Unknown command '"+ cmd +"'");
var op = CMD_TABLE[cmd];
//if (!this.typeCheck(op.params, args))
//this.error("Wrong arguments for command '"+ cmd +"'");
op.op.call(this, args);
var fn = gfx[cmd];
if (fn && cmd[0] != "$") {
if (fn.length != args.length)
this.error("Invalid number of arguments '" + cmd + "'");
fn.apply(gfx, args);
} else
this.error("Unknown command '" + cmd + "'");
args.length = 0;
} else if (MAX_ARGS == args.length) {
this.error("Too many arguments");
} else {
args.push(IsName(obj) ? obj.name : obj);
args.push(obj);
}
}
this.gfx.endDrawing();
},
typeCheck: function(params, args) {
if (params.length != args.length)
return false;
for (var i = 0; i < params.length; ++i)
if (!args[i]["is"+ params[i]]())
return false;
return true;
},
error: function(what) {
throw new Error(what);
},
@ -977,85 +863,85 @@ var EchoGraphics = (function() {
},
// Graphics state
setLineWidth: function(width) {
w: function(width) { // setLineWidth
this.printdentln(width +" w");
},
setDash: function(dashArray, dashPhase) {
d: function(dashArray, dashPhase) { // setDash
this.printdentln(""+ dashArray +" "+ dashPhase +" d");
},
save: function() {
q: function() { // save
this.printdentln("q");
},
restore: function() {
Q: function() { // restore
this.printdentln("Q");
},
transform: function(a, b, c, d, e, f) {
cm: function(a, b, c, d, e, f) { // transform
this.printdentln(""+ a +" "+ b +" "+ c +
" "+d +" "+ e +" "+ f + " cm");
},
// Path
moveTo: function(x, y) {
m: function(x, y) { // moveTo
this.printdentln(""+ x +" "+ y +" m");
},
lineTo: function(x, y) {
l: function(x, y) { // lineTo
this.printdentln(""+ x +" "+ y +" l");
},
curveTo: function(x1, y1, x2, y2, x3, y3) {
c: function(x1, y1, x2, y2, x3, y3) { // curvoTo
this.printdentln(""+ x1 +" "+ y1 +
" "+ x2 +" "+ y2 +
" "+ x3 +" "+ y3 + " c");
},
closePath: function() {
h: function() { // closePath
this.printdentln("h");
},
rectangle: function(x, y, width, height) {
re: function(x, y, width, height) { // rectangle
this.printdentln(""+ x +" "+ y + " "+ width +" "+ height +" re");
},
stroke: function() {
S: function() { // stroke
this.printdentln("S");
},
fill: function() {
f: function() { // fill
this.printdentln("f");
},
fillStroke: function() {
B: function() { // fillStroke
this.printdentln("B");
},
closeFillStroke: function() {
b: function() { // closeFillStroke
this.printdentln("b");
},
// Clipping
// Text
beginText: function() {
BT: function() { // beginText
this.printdentln("BT");
this.indent();
},
endText: function() {
ET: function() { // endText
this.dedent();
this.printdentln("ET");
},
setFont: function(font, size) {
this.printdentln("/"+ font.Name +" "+ size +" Tf");
Tf: function(font, size) { // setFont
this.printdentln("/"+ font.name +" "+ size +" Tf");
},
moveText: function (x, y) {
Td: function (x, y) { // moveText
this.printdentln(""+ x +" "+ y +" Td");
},
showText: function(text) {
Tj: function(text) { // showText
this.printdentln("( "+ text +" ) Tj");
},
// Type3 fonts
// Color
setFillGray: function(gray) {
g: function(gray) { // setFillGray
this.printdentln(""+ gray +" g");
},
setStrokeRGBColor: function(r, g, b) {
RG: function(r, g, b) { // setStrokeRGBColor
this.printdentln(""+ r +" "+ g +" "+ b +" RG");
},
setFillRGBColor: function(r, g, b) {
rg: function(r, g, b) { // setFillRGBColor
this.printdentln(""+ r +" "+ g +" "+ b +" rg");
},
@ -1122,75 +1008,75 @@ var CanvasGraphics = (function() {
},
// Graphics state
setLineWidth: function(width) {
w: function(width) { // setLineWidth
this.ctx.lineWidth = width;
},
setDash: function(dashArray, dashPhase) {
// NYI
d: function(dashArray, dashPhase) { // setDash
// TODO
},
save: function() {
q: function() { // save
this.ctx.save();
this.stateStack.push(this.current);
this.current = new CanvasExtraState();
},
restore: function() {
Q: function() { // restore
this.current = this.stateStack.pop();
this.ctx.restore();
},
transform: function(a, b, c, d, e, f) {
cm: function(a, b, c, d, e, f) { // transform
this.ctx.transform(a, b, c, d, e, f);
},
// Path
moveTo: function(x, y) {
m: function(x, y) { // moveTo
this.ctx.moveTo(x, y);
},
lineTo: function(x, y) {
l: function(x, y) { // lineTo
this.ctx.lineTo(x, y);
},
curveTo: function(x1, y1, x2, y2, x3, y3) {
c: function(x1, y1, x2, y2, x3, y3) { // curveTo
this.ctx.bezierCurveTo(x1, y1, x2, y2, x3, y3);
},
closePath: function() {
h: function() { // closePath
this.ctx.closePath();
},
rectangle: function(x, y, width, height) {
re: function(x, y, width, height) { // rectangle
this.ctx.rect(x, y, width, height);
},
stroke: function() {
S: function() { // stroke
this.ctx.stroke();
this.consumePath();
this.$consumePath();
},
fill: function() {
f: function() { // fill
this.ctx.fill();
this.consumePath();
this.$consumePath();
},
fillStroke: function() {
B: function() { // fillStroke
this.ctx.fill();
this.ctx.stroke();
this.consumePath();
this.$consumePath();
},
closeFillStroke: function() {
return this.fillStroke();
b: function() { // closeFillStroke
return this.B(); // fillStroke
},
// Clipping
// Text
beginText: function() {
BT: function() { // beginText
// TODO
},
endText: function() {
ET: function() { // endText
// TODO
},
setFont: function(font, size) {
Tf: function(font, size) { // setFont
this.ctx.font = size +'px '+ font.BaseFont;
},
moveText: function (x, y) {
Td: function (x, y) { // moveText
this.current.lineX = x;
this.current.lineY = y;
},
showText: function(text) {
Tj: function(text) { // showText
this.ctx.save();
this.ctx.translate(0, 2 * this.current.lineY);
this.ctx.scale(1, -1);
@ -1203,20 +1089,22 @@ var CanvasGraphics = (function() {
// Type3 fonts
// Color
setFillGray: function(gray) {
this.setFillRGBColor(gray, gray, gray);
g: function(gray) { // setFillGray
this.rg(gray, gray, gray); // setFillRGBColor
},
setStrokeRGBColor: function(r, g, b) {
this.ctx.strokeStyle = this.makeCssRgb(r, g, b);
RG: function(r, g, b) { // setStrokeRGBColor
this.ctx.strokeStyle = this.$makeCssRgb(r, g, b);
},
setFillRGBColor: function(r, g, b) {
this.ctx.fillStyle = this.makeCssRgb(r, g, b);
rg: function(r, g, b) { // setFillRGBColor
this.ctx.fillStyle = this.$makeCssRgb(r, g, b);
},
consumePath: function() {
// Helper functions that are not allowed to be called directly.
$consumePath: function() {
this.ctx.beginPath();
},
makeCssRgb: function(r, g, b) {
$makeCssRgb: function(r, g, b) {
var ri = (255 * r) | 0, gi = (255 * g) | 0, bi = (255 * b) | 0;
return "rgb("+ ri +","+ gi +","+ bi +")";
},