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description("Test the handling of negative sourceRect offset in getImageData().");
ctx = document.createElement('canvas').getContext('2d');
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 100, 100);
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 6, 6);
var imageData = ctx.getImageData(-10, 0, 100, 1);
var imgdata = imageData.data;
// Fully transparent black
shouldBe("imgdata[0]", "0");
shouldBe("imgdata[1]", "0");
shouldBe("imgdata[2]", "0");
shouldBe("imgdata[3]", "0");
// Green
shouldBe("imgdata[60]", "0");
shouldBe("imgdata[61]", "128");
shouldBe("imgdata[62]", "0");
shouldBe("imgdata[63]", "255");
// Red
shouldBe("imgdata[64]", "255");
shouldBe("imgdata[65]", "0");
shouldBe("imgdata[66]", "0");
shouldBe("imgdata[67]", "255");
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