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1 description("Test for chromium's canvas bug where fillText resets the current co
ntext https://bugs.webkit.org/show_bug.cgi?id=26436 . You must see green box wit
h message 'This text should be seen', and black box below the green box.") | |
2 | |
3 function pixelValueAt(context, x, y) { | |
4 var imageData = context.getImageData(x, y, 1, 1); | |
5 return imageData.data; | |
6 } | |
7 | |
8 function pixelToString(p) { | |
9 return "[" + p[0] + ", " + p[1] + ", " + p[2] + ", " + p[3] + "]" | |
10 } | |
11 | |
12 function pixelShouldBe(context, x, y, expectedPixelString) { | |
13 var pixel = pixelValueAt(context, x, y); | |
14 var expectedPixel = eval(expectedPixelString); | |
15 | |
16 var pixelString = "pixel " + x + ", " + y; | |
17 if (areArraysEqual(pixel, expectedPixel)) { | |
18 testPassed(pixelString + " is " + pixelToString(pixel)); | |
19 } else { | |
20 testFailed(pixelString + " should be " + pixelToString(expectedPixel) +
" was " + pixelToString(pixel)); | |
21 } | |
22 } | |
23 | |
24 var canvas = document.createElement("canvas"); | |
25 canvas.height = 100; | |
26 canvas.width = 500; | |
27 canvas.style.height = "100"; | |
28 canvas.style.width = "500"; | |
29 | |
30 document.body.appendChild(canvas); | |
31 | |
32 var ctx = canvas.getContext('2d'); | |
33 ctx.fillStyle = 'rgb(0,255,0)'; | |
34 ctx.fillRect(0, 0, 500, 100); | |
35 ctx.fillStyle = 'rgb(0,0,0)'; | |
36 ctx.fillText("This text should be seen", 20, 20); | |
37 ctx.translate(0, 50); | |
38 ctx.font = "10pt Arial"; | |
39 ctx.fillText("This text should NOT be seen", 20, 20); | |
40 // If fillText resets the current context, this rectangle won't hide the text. | |
41 ctx.fillStyle = 'rgb(0,0,0)'; | |
42 ctx.fillRect(0, 0, 500, 50); | |
43 | |
44 pixelShouldBe(ctx, 0, 0, "[0,255,0,255]"); | |
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