1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
function EventListener() {
this.listeners = {};
this.addEventListener = function addEventListener(event, func) {
if (!this.listeners[event]) this.listeners[event] = [];
this.listeners[event].push(func);
};
this.fireEvent = function fireEvent(event) {
event.preventDefault = function(){};
if (event.type in this.listeners) {
this.listeners[event.type].forEach(function(listener) {
listener(event);
});
}
};
};
var window = this;
var windowExtra = new EventListener();
for (var x in windowExtra) window[x] = windowExtra[x];
window.close = function window_close() {
postMessage({ target: 'window', method: 'close' });
};
var document = new EventListener();
document.createElement = function document_createElement(what) {
switch(what) {
case 'canvas': {
var canvas = new EventListener();
canvas.ensureData = function canvas_ensureData() {
if (!canvas.data || canvas.data.width !== canvas.width || canvas.data.height !== canvas.height) {
canvas.data = {
width: canvas.width,
height: canvas.height,
data: new Uint8Array(canvas.width*canvas.height*4)
};
postMessage({ target: 'canvas', op: 'resize', width: canvas.width, height: canvas.height });
}
};
canvas.getContext = function canvas_getContext(type) {
assert(type == '2d');
return {
getImageData: function(x, y, w, h) {
assert(x == 0 && y == 0 && w == canvas.width && h == canvas.height);
canvas.ensureData();
return {
width: canvas.data.width,
height: canvas.data.height,
data: new Uint8Array(canvas.data.data) // TODO: can we avoid this copy?
};
},
putImageData: function(image, x, y) {
canvas.ensureData();
assert(x == 0 && y == 0 && image.width == canvas.width && image.height == canvas.height);
canvas.data.data.set(image.data); // TODO: can we avoid this copy?
postMessage({ target: 'canvas', op: 'render', image: canvas.data });
}
};
};
canvas.boundingClientRect = {};
canvas.getBoundingClientRect = function canvas_getBoundingClientRect() {
return {
width: canvas.boundingClientRect.width,
height: canvas.boundingClientRect.height,
top: canvas.boundingClientRect.top,
left: canvas.boundingClientRect.left,
bottom: canvas.boundingClientRect.bottom,
right: canvas.boundingClientRect.right
};
};
return canvas;
}
default: throw 'document.createElement ' + what;
}
};
if (typeof console === 'undefined') {
var console = {
log: function(x) {
Module.printErr(x);
}
};
}
Module.canvas = document.createElement('canvas');
Module.setStatus = function(){};
Module.print = function Module_print(x) {
postMessage({ target: 'stdout', content: x });
};
Module.printErr = function Module_printErr(x) {
postMessage({ target: 'stderr', content: x });
};
// buffer messages until the program starts to run
var messageBuffer = null;
function messageResender() {
if (calledMain) {
assert(messageBuffer && messageBuffer.length > 0);
messageBuffer.forEach(function(message) {
onmessage(message);
});
messageBuffer = null;
} else {
setTimeout(messageResender, 100);
}
}
onmessage = function onmessage(message) {
if (!calledMain) {
if (!messageBuffer) {
messageBuffer = [];
setTimeout(messageResender, 100);
}
messageBuffer.push(message);
}
switch (message.data.target) {
case 'document': {
document.fireEvent(message.data.event);
break;
}
case 'window': {
window.fireEvent(message.data.event);
break;
}
case 'canvas': {
if (message.data.event) {
Module.canvas.fireEvent(message.data.event);
} else if (message.data.boundingClientRect) {
Module.canvas.boundingClientRect = message.data.boundingClientRect;
} else throw 'ey?';
break;
}
default: throw 'wha? ' + message.data.target;
}
};
|
