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description("Test for chromium's canvas bug where fillText resets the current context https://bugs.webkit.org/show_bug.cgi?id=26436 . You must see green box with message 'This text should be seen', and black box below the green box.")
function pixelValueAt(context, x, y) {
var imageData = context.getImageData(x, y, 1, 1);
return imageData.data;
}
function pixelToString(p) {
return "[" + p[0] + ", " + p[1] + ", " + p[2] + ", " + p[3] + "]"
}
function pixelShouldBe(context, x, y, expectedPixelString) {
var pixel = pixelValueAt(context, x, y);
var expectedPixel = eval(expectedPixelString);
var pixelString = "pixel " + x + ", " + y;
if (areArraysEqual(pixel, expectedPixel)) {
testPassed(pixelString + " is " + pixelToString(pixel));
} else {
testFailed(pixelString + " should be " + pixelToString(expectedPixel) + " was " + pixelToString(pixel));
}
}
var canvas = document.createElement("canvas");
canvas.height = 100;
canvas.width = 500;
canvas.style.height = "100";
canvas.style.width = "500";
document.body.appendChild(canvas);
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'rgb(0,255,0)';
ctx.fillRect(0, 0, 500, 100);
ctx.fillStyle = 'rgb(0,0,0)';
ctx.fillText("This text should be seen", 20, 20);
ctx.translate(0, 50);
ctx.font = "10pt Arial";
ctx.fillText("This text should NOT be seen", 20, 20);
// If fillText resets the current context, this rectangle won't hide the text.
ctx.fillStyle = 'rgb(0,0,0)';
ctx.fillRect(0, 0, 500, 50);
pixelShouldBe(ctx, 0, 0, "[0,255,0,255]");
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