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Clipping (non-zero winding)

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Chris Jones 2011-05-09 21:05:33 -05:00
parent 79ef581434
commit e820a20b63
1 changed files with 44 additions and 8 deletions
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52
pdf.js
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@ -1597,6 +1597,8 @@ var Interpreter = (function() {
n: gfx.endPath,
// Clipping
W: gfx.clip,
"W*": gfx.eoClip,
// Text
BT: gfx.beginText,
@ -1749,6 +1751,12 @@ var EchoGraphics = (function() {
},
// Clipping
clip: function() {
this.printdentln("W");
},
eoClip: function() {
this.printdentln("W*");
},
// Text
beginText: function() {
@ -1868,10 +1876,13 @@ var CanvasGraphics = (function() {
this.ctx = canvasCtx;
this.current = new CanvasExtraState();
this.stateStack = [ ];
this.pendingClip = null;
}
var LINE_CAP_STYLES = [ "butt", "round", "square" ];
var LINE_JOIN_STYLES = [ "miter", "round", "bevel" ];
var NORMAL_CLIP = {};
var EO_CLIP = {};
constructor.prototype = {
beginDrawing: function(mediaBox) {
@ -1953,6 +1964,12 @@ var CanvasGraphics = (function() {
},
// Clipping
clip: function() {
this.pendingClip = NORMAL_CLIP;
},
eoClip: function() {
this.pendingClip = EO_CLIP;
},
// Text
beginText: function() {
@ -2028,10 +2045,14 @@ var CanvasGraphics = (function() {
// TODO
},
// Helper functions
consumePath: function() {
if (this.pendingClip) {
// TODO: <canvas> needs to support even-odd winding rule
this.ctx.clip();
this.pendingClip = null;
}
this.ctx.beginPath();
},
makeCssRgb: function(r, g, b) {
@ -2149,13 +2170,6 @@ var tests = [
int(-72), int(0), cmd("l"),
int(4), cmd("w"),
cmd("h"), cmd("S"),
int(100), int(72), cmd("m"),
int(172), int(0), cmd("l"),
int(100), int(-72), cmd("l"),
int(-172), int(0), cmd("l"),
int(4), cmd("w"),
cmd("n"),
cmd("S"),
eof()
]
},
@ -2251,6 +2265,28 @@ var tests = [
eof()
],
},
{ name: "Broken heart",
res: { },
mediaBox: [ 0, 0, 612, 792 ],
objs: [
cmd("q"),
int(20), int(20), int(60), int(60), cmd("re"),
int(60), int(60), int(60), int(60), cmd("re"),
cmd("W"), cmd("n"),
real(0.9), real(0.0), real(0.0), cmd("rg"),
int(75), int(40), cmd("m"),
int(75), int(37), int(70), int(25), int(50), int(25), cmd("c"),
int(20), int(25), int(20), real(62.5), int(20), real(62.5), cmd("c"),
int(20), int(80), int(40), int(102), int(75), int(120), cmd("c"),
int(110), int(102), int(130), int(80), int(130), real(62.5), cmd("c"),
int(130), real(62.5), int(130), int(25), int(100), int(25), cmd("c"),
int(85), int(25), int(75), int(37), int(75), int(40), cmd("c"),
cmd("f"),
cmd("Q"),
eof()
]
},
];