basic kinda-working form xobject support

This commit is contained in:
Chris Jones 2011-05-17 14:08:05 +12:00
parent d7f3c31d9d
commit f80a88864b
2 changed files with 99 additions and 24 deletions

115
pdf.js
View File

@ -1,17 +1,34 @@
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- /
/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
function warn(msg) {
var ERRORS = 0, WARNINGS = 1, TODOS = 5;
var verbosity = WARNINGS;
function log(msg) {
if (console && console.log)
console.log(msg);
if (print)
else if (print)
print(msg);
}
function warn(msg) {
if (verbosity >= WARNINGS)
log("Warning: "+ msg);
}
function error(msg) {
throw new Error(msg);
}
function TODO(what) {
if (verbosity >= TODOS)
log("TODO: "+ what);
}
function malformed(msg) {
error("Malformed PDF: "+ msg);
}
function assert(cond, msg) {
if (!cond)
error(msg);
@ -21,7 +38,7 @@ function assert(cond, msg) {
// behavior is undefined.
function assertWellFormed(cond, msg) {
if (!cond)
error("Malformed PDF: "+ msg);
malformed(msg);
}
function shadow(obj, prop, value) {
@ -2006,11 +2023,14 @@ var PDFDoc = (function() {
return constructor;
})();
var IDENTITY_MATRIX = [ 1, 0, 0, 1, 0, 0 ];
// <canvas> contexts store most of the state we need natively.
// However, PDF needs a bit more state, which we store here.
var CanvasExtraState = (function() {
function constructor() {
this.fontSize = 0.0;
this.textMatrix = IDENTITY_MATRIX;
// Current point (in user coordinates)
this.curX = 0.0;
this.curY = 0.0;
@ -2039,6 +2059,7 @@ var CanvasGraphics = (function() {
d: this.setDash,
ri: this.setRenderingIntent,
i: this.setFlatness,
gs: this.setGState,
q: this.save,
Q: this.restore,
cm: this.transform,
@ -2078,6 +2099,7 @@ var CanvasGraphics = (function() {
SCN: this.setStrokeColorN,
sc: this.setFillColor,
scn: this.setFillColorN,
G: this.setStrokeGray,
g: this.setFillGray,
RG: this.setStrokeRGBColor,
rg: this.setFillRGBColor,
@ -2151,13 +2173,16 @@ var CanvasGraphics = (function() {
this.ctx.lineJoin = LINE_JOIN_STYLES[style];
},
setDash: function(dashArray, dashPhase) {
// TODO
TODO("set dash");
},
setRenderingIntent: function(intent) {
// TODO
TODO("set rendering intent");
},
setFlatness: function(flatness) {
// TODO
TODO("set flatness");
},
setGState: function(dictName) {
TODO("set graphics state from dict");
},
save: function() {
this.ctx.save();
@ -2200,7 +2225,7 @@ var CanvasGraphics = (function() {
this.consumePath();
},
eoFill: function() {
// TODO: <canvas> needs to support even-odd winding rule
TODO("even-odd fill");
this.fill();
},
fillStroke: function() {
@ -2225,10 +2250,9 @@ var CanvasGraphics = (function() {
// Text
beginText: function() {
// TODO
this.current.textMatrix = IDENTITY_MATRIX;
},
endText: function() {
// TODO
},
setFont: function(fontRef, size) {
var font = this.res.get("Font").get(fontRef.name);
@ -2245,12 +2269,13 @@ var CanvasGraphics = (function() {
this.current.curY = this.current.lineY;
},
setTextMatrix: function(a, b, c, d, e, f) {
// TODO
this.current.textMatrix = [ a, b, c, d, e, f ];
},
showText: function(text) {
this.ctx.save();
this.ctx.translate(0, 2 * this.current.curY);
this.ctx.scale(1, -1);
this.ctx.transform.apply(this.ctx, this.current.textMatrix);
this.ctx.fillText(text, this.current.curX, this.current.curY);
this.current.curX += this.ctx.measureText(text).width;
@ -2262,10 +2287,10 @@ var CanvasGraphics = (function() {
var e = arr[i];
if (IsNum(e)) {
this.current.curX -= e * 0.001 * this.current.fontSize;
} else {
assertWellFormed(IsString(e),
"TJ array element isn't string or num");
} else if (IsString(e)) {
this.showText(e);
} else {
malformed("TJ array element "+ e +" isn't string or num");
}
}
},
@ -2274,22 +2299,37 @@ var CanvasGraphics = (function() {
// Color
setStrokeColorSpace: function(space) {
// TODO
// TODO real impl
},
setFillColorSpace: function(space) {
// TODO
// TODO real impl
},
setStrokeColor: function(/*...*/) {
// TODO
// TODO real impl
if (1 === arguments.length) {
this.setStrokeGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setStrokeRGBColor.apply(this, arguments);
}
},
setStrokeColorN: function(/*...*/) {
// TODO
// TODO real impl
this.setStrokeColor.apply(this, arguments);
},
setFillColor: function(/*...*/) {
// TODO
// TODO real impl
if (1 === arguments.length) {
this.setFillGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setFillRGBColor.apply(this, arguments);
}
},
setFillColorN: function(/*...*/) {
// TODO
// TODO real impl
this.setFillColor.apply(this, arguments);
},
setStrokeGray: function(gray) {
this.setStrokeRGBColor(gray, gray, gray);
},
setFillGray: function(gray) {
this.setFillRGBColor(gray, gray, gray);
@ -2303,7 +2343,7 @@ var CanvasGraphics = (function() {
// Shading
shadingFill: function(entry) {
// TODO
TODO("shading fill");
},
// XObjects
@ -2313,16 +2353,45 @@ var CanvasGraphics = (function() {
return;
xobj = this.xref.fetchIfRef(xobj);
assertWellFormed(IsStream(xobj), "XObject should be a stream");
var type = xobj.dict.get("Subtype");
assertWellFormed(IsName(type), "XObject should have a Name subtype");
if ("Image" == type.name) {
TODO("Image XObjects");
} else if ("Form" == type.name) {
this.paintFormXObject(xobj);
} else if ("PS" == type.name) {
warn("(deprecated) PostScript XObjects are not supported");
} else {
malformed("Unknown XObject subtype "+ type.name);
}
},
this.interpret(new Parser(new Lexer(xobj), false),
this.xref, xobj.dict.get("Resources"));
paintFormXObject: function(form) {
this.save();
var matrix = form.dict.get("Matrix");
if (matrix && IsArray(matrix) && 6 == matrix.length)
this.transform.apply(this, matrix);
var bbox = form.dict.get("BBox");
if (bbox && IsArray(bbox) && 4 == bbox.length) {
this.rectangle.apply(this, bbox);
this.clip();
this.endPath();
}
this.interpret(new Parser(new Lexer(form), false),
this.xref, form.dict.get("Resources"));
this.restore();
},
// Helper functions
consumePath: function() {
if (this.pendingClip) {
// TODO: <canvas> needs to support even-odd winding rule
if (this.pendingClip == EO_CLIP)
TODO("even-odd clipping");
this.ctx.clip();
this.pendingClip = null;
}

View File

@ -80,6 +80,11 @@ function prevPage() {
if (pageNum > 1)
--pageNum;
displayPage(pageNum);
}
function gotoPage(num) {
if (0 <= num && num <= numPages)
pageNum = num;
displayPage(pageNum);
}
</script>
</head>
@ -88,7 +93,8 @@ function prevPage() {
<div>
<button onclick="prevPage();">Previous</button>
<button onclick="nextPage();">Next</button>
<input type="text" id="pageNumber" value="1" size="5"></input>
<input type="text" id="pageNumber" onchange="gotoPage(this.value);"
value="1" size="5"></input>
Time to render: <span id="time"></span>
<div id="viewer">
<!-- Canvas dimensions must be specified in CSS pixels. CSS pixels