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
|
// spec link: https://html.spec.whatwg.org/#the-offscreen-2d-rendering-context
importScripts("/resources/testharness.js");
function createTestImage() {
var image = new OffscreenCanvas(100, 50);
var imgctx = image.getContext('2d');
imgctx.fillStyle = "#F00";
imgctx.fillRect(0, 0, 2, 2);
imgctx.fillStyle = "#0F0";
imgctx.fillRect(0, 0, 1, 1);
return image;
}
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
assert_true(ctx.imageSmoothingEnabled);
}, "When the context is created, imageSmoothingEnabled must be set to true.");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
ctx.imageSmoothingEnabled = false;
assert_false(ctx.imageSmoothingEnabled);
}, "On getting imageSmoothingEnabled, the user agent must return the last value it was set to.");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
var image = createTestImage();
ctx.scale(10, 10);
ctx.drawImage(image, 0, 0);
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_not_equals(pixels[0], 0);
assert_not_equals(pixels[1], 255);
}, "Test that image smoothing is actually on by default.");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
ctx.imageSmoothingEnabled = true;
var image = createTestImage();
ctx.scale(10, 10);
ctx.drawImage(image, 0, 0);
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_not_equals(pixels[0], 0);
assert_not_equals(pixels[1], 255);
}, "Test that image smoothing works when imageSmoothingEnabled is set to true");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
var image = createTestImage();
ctx.imageSmoothingEnabled = false;
ctx.scale(10, 10);
ctx.drawImage(image, 0, 0);
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_array_equals(pixels, [0, 255, 0, 255]);
}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with drawImage().");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
var image = createTestImage();
ctx.imageSmoothingEnabled = false;
ctx.scale(10, 10);
ctx.fillStyle = ctx.createPattern(image, 'repeat');
ctx.fillRect(0, 0, 10, 10);
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_array_equals(pixels, [0, 255, 0, 255]);
}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with fillRect and createPattern().");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
var image = createTestImage();
ctx.imageSmoothingEnabled = false;
ctx.fillStyle = ctx.createPattern(image, 'repeat');
ctx.scale(10, 10);
ctx.rect(0, 0, 10, 10);
ctx.fill();
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_array_equals(pixels, [0, 255, 0, 255]);
}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with fill() and createPattern().");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
var image = createTestImage();
ctx.strokeStyle = ctx.createPattern(image, 'repeat');
ctx.lineWidth = 5;
ctx.imageSmoothingEnabled = false;
ctx.scale(10, 10);
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(10, 10);
ctx.stroke();
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_array_equals(pixels, [0, 255, 0, 255]);
}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) works with stroke() and createPattern().");
test(function() {
var repaints = 5;
var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');
function draw() {
ctx.clearRect(0, 0, 10, 10);
ctx.setTransform(1, 0, 0, 1, 0, 0);
var image = createTestImage();
ctx.imageSmoothingEnabled = false;
ctx.scale(10, 10);
ctx.drawImage(image, 0, 0);
var pixels = ctx.getImageData(9, 9, 1, 1).data;
assert_array_equals(pixels, [0, 255, 0, 255]);
}
while (repaints > 0) {
draw();
repaints = repaints - 1;
}
}, "Test that imageSmoothingEnabled = false (nearest-neighbor interpolation) still works after repaints.");
done();
|
