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
|
description("Ensure correct behavior when drawing a canvas on a canvas with shadows. A blue and red checkered pattern should be displayed.");
function print(message, color)
{
var paragraph = document.createElement("div");
paragraph.appendChild(document.createTextNode(message));
paragraph.style.fontFamily = "monospace";
if (color)
paragraph.style.color = color;
document.getElementById("console").appendChild(paragraph);
}
function shouldBeAround(a, b)
{
var evalA;
try {
evalA = eval(a);
} catch(e) {
evalA = e;
}
if (Math.abs(evalA - b) < 15)
print("PASS " + a + " is around " + b , "green")
else
print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red");
}
var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
canvas.setAttribute('width', '600');
canvas.setAttribute('height', '600');
var ctx = canvas.getContext('2d');
ctx.shadowOffsetX = 100;
ctx.shadowOffsetY = 100;
var aCanvas = document.createElement('canvas');
aCanvas.width = 300;
aCanvas.height = 300;
var aCtx = aCanvas.getContext('2d');
aCtx.fillStyle = 'rgba(0, 0, 255, 1.0)';
aCtx.fillRect(100, 100, 100, 100);
ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
ctx.drawImage(aCanvas, 0, 0);
ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
ctx.drawImage(aCanvas, 0, 200);
ctx.shadowBlur = 5;
ctx.shadowColor = 'rgba(255, 0, 0, 1.0)';
ctx.drawImage(aCanvas, 200, 0);
ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
ctx.drawImage(aCanvas, 200, 200);
var d; // imageData.data
// Verify solid shadow.
d = ctx.getImageData(200, 205, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '255');
d = ctx.getImageData(299, 295, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '255');
d = ctx.getImageData(200, 299, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBe('d[3]', '255');
// Verify solid alpha shadow.
d = ctx.getImageData(200, 405, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '127');
d = ctx.getImageData(299, 405, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '127');
d = ctx.getImageData(205, 499, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '127');
// Verify blurry shadow.
d = ctx.getImageData(500, 211, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '100');
d = ctx.getImageData(399, 205, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '100');
d = ctx.getImageData(450, 300, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '100');
// Verify blurry alpha shadow.
d = ctx.getImageData(500, 411, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '50');
d = ctx.getImageData(399, 405, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '50');
d = ctx.getImageData(450, 500, 1, 1).data;
shouldBe('d[0]', '255');
shouldBe('d[1]', '0');
shouldBe('d[2]', '0');
shouldBeAround('d[3]', '50');
|