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1 description("Ensure correct behavior of canvas with image shadow. A square with
a cut-out top-right corner should be displayed with solid shadow (top) and blur
shadow (bottom)."); | |
2 | |
3 function print(message, color) | |
4 { | |
5 var paragraph = document.createElement("div"); | |
6 paragraph.appendChild(document.createTextNode(message)); | |
7 paragraph.style.fontFamily = "monospace"; | |
8 if (color) | |
9 paragraph.style.color = color; | |
10 document.getElementById("console").appendChild(paragraph); | |
11 } | |
12 | |
13 function shouldNotBe(a, b) | |
14 { | |
15 var evalA; | |
16 try { | |
17 evalA = eval(a); | |
18 } catch(e) { | |
19 evalA = e; | |
20 } | |
21 | |
22 if (evalA != b) | |
23 print("PASS " + a + " should not be " + b + " and it's not.", "green") | |
24 else | |
25 print("FAIL " + a + " should not be " + b + " but it is.", "red"); | |
26 } | |
27 | |
28 // Create auxiliary canvas to draw to and create an image from. | |
29 // This is done instead of simply loading an image from the file system | |
30 // because that would throw a SECURITY_ERR DOM Exception. | |
31 var aCanvas = document.createElement('canvas'); | |
32 aCanvas.setAttribute('width', '200'); | |
33 aCanvas.setAttribute('height', '200'); | |
34 var aCtx = aCanvas.getContext('2d'); | |
35 | |
36 // Draw a circle on the same canvas. | |
37 aCtx.beginPath(); | |
38 aCtx.fillStyle = 'green'; | |
39 aCtx.arc(100, 100, 150, 0, -Math.PI/2, false); | |
40 aCtx.fill(); | |
41 | |
42 // Create the image object to be drawn on the master canvas. | |
43 var img = new Image(); | |
44 img.onload = drawImageToCanvasAndCheckPixels; | |
45 img.src = aCanvas.toDataURL(); // set a data URI of the base64 enconded image as
the source | |
46 | |
47 // Create master canvas. | |
48 var canvas = document.createElement('canvas'); | |
49 document.body.appendChild(canvas); | |
50 canvas.setAttribute('width', '600'); | |
51 canvas.setAttribute('height', '600'); | |
52 var ctx = canvas.getContext('2d'); | |
53 | |
54 function drawImageToCanvasAndCheckPixels() { | |
55 ctx.shadowOffsetX = 250; | |
56 ctx.shadowColor = 'rgba(240, 50, 50, 1.0)'; | |
57 ctx.drawImage(img, 50, 50); | |
58 | |
59 ctx.shadowOffsetX = 250; | |
60 ctx.shadowBlur = 6; | |
61 ctx.shadowColor = 'rgba(50, 50, 200, 0.9)'; | |
62 ctx.shadowColor = 'rgba(0, 0, 255, 1.0)'; | |
63 ctx.drawImage(img, 50, 300); | |
64 | |
65 checkPixels(); | |
66 } | |
67 | |
68 function checkPixels() { | |
69 var imageData, data; | |
70 | |
71 // Verify solid shadow. | |
72 imageData = ctx.getImageData(260, 300, 1, 1); | |
73 d = imageData.data; | |
74 shouldBe('d[0]', '0'); | |
75 shouldBe('d[1]', '0'); | |
76 shouldBe('d[2]', '0'); | |
77 shouldBe('d[3]', '0'); | |
78 | |
79 imageData = ctx.getImageData(350, 100, 1, 1); | |
80 d = imageData.data; | |
81 shouldBe('d[0]', '240'); | |
82 shouldBe('d[1]', '50'); | |
83 shouldBe('d[2]', '50'); | |
84 shouldBe('d[3]', '255'); | |
85 | |
86 imageData = ctx.getImageData(400, 200, 1, 1); | |
87 d = imageData.data; | |
88 shouldBe('d[0]', '240'); | |
89 shouldBe('d[1]', '50'); | |
90 shouldBe('d[2]', '50'); | |
91 shouldBe('d[3]', '255'); | |
92 | |
93 imageData = ctx.getImageData(490, 65, 1, 1); | |
94 d = imageData.data; | |
95 shouldBe('d[0]', '0'); | |
96 shouldBe('d[1]', '0'); | |
97 shouldBe('d[2]', '0'); | |
98 shouldBe('d[3]', '0'); | |
99 | |
100 imageData = ctx.getImageData(485, 65, 1, 1); | |
101 d = imageData.data; | |
102 shouldBe('d[0]', '0'); | |
103 shouldBe('d[1]', '0'); | |
104 shouldBe('d[2]', '0'); | |
105 shouldBe('d[3]', '0'); | |
106 | |
107 // Verify blurry shadow. | |
108 imageData = ctx.getImageData(260, 400, 1, 1); | |
109 d = imageData.data; | |
110 shouldBe('d[0]', '0'); | |
111 shouldBe('d[1]', '0'); | |
112 shouldBe('d[2]', '0'); | |
113 shouldBe('d[3]', '0'); | |
114 | |
115 imageData = ctx.getImageData(350, 300, 1, 1); | |
116 d = imageData.data; | |
117 shouldBe('d[0]', '0'); | |
118 shouldBe('d[1]', '0'); | |
119 shouldBe('d[2]', '255'); | |
120 shouldNotBe('d[3]', '255'); | |
121 | |
122 imageData = ctx.getImageData(300, 400, 1, 1); | |
123 d = imageData.data; | |
124 shouldBe('d[0]', '0'); | |
125 shouldBe('d[1]', '0'); | |
126 shouldBe('d[2]', '255'); | |
127 shouldNotBe('d[3]', '255'); | |
128 | |
129 imageData = ctx.getImageData(300, 500, 1, 1); | |
130 d = imageData.data; | |
131 shouldBe('d[0]', '0'); | |
132 shouldBe('d[1]', '0'); | |
133 shouldBe('d[2]', '255'); | |
134 shouldNotBe('d[3]', '255'); | |
135 | |
136 imageData = ctx.getImageData(400, 500, 1, 1); | |
137 d = imageData.data; | |
138 shouldBe('d[0]', '0'); | |
139 shouldBe('d[1]', '0'); | |
140 shouldBe('d[2]', '255'); | |
141 shouldNotBe('d[3]', '255'); | |
142 | |
143 imageData = ctx.getImageData(400, 400, 1, 1); | |
144 d = imageData.data; | |
145 shouldBe('d[0]', '0'); | |
146 shouldBe('d[1]', '0'); | |
147 shouldBe('d[2]', '255'); | |
148 | |
149 imageData = ctx.getImageData(490, 315, 1, 1); | |
150 d = imageData.data; | |
151 shouldBe('d[0]', '0'); | |
152 shouldBe('d[1]', '0'); | |
153 shouldBe('d[2]', '0'); | |
154 shouldBe('d[3]', '0'); | |
155 | |
156 imageData = ctx.getImageData(485, 320, 1, 1); | |
157 d = imageData.data; | |
158 shouldBe('d[0]', '0'); | |
159 shouldBe('d[1]', '0'); | |
160 shouldBe('d[2]', '0'); | |
161 shouldBe('d[3]', '0'); | |
162 | |
163 finishJSTest(); | |
164 } | |
165 | |
166 window.jsTestIsAsync = true; | |
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