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description("Series of tests to ensure correct behaviour of canvas.setTransform()");
var ctx = document.createElement('canvas').getContext('2d');
// Reset the CTM to the initial matrix
ctx.beginPath();
ctx.scale(0.5, 0.5);
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 100, 100);
var imageData = ctx.getImageData(1, 1, 98, 98);
var imgdata = imageData.data;
shouldBe("imgdata[4]", "0");
shouldBe("imgdata[5]", "128");
shouldBe("imgdata[6]", "0");
// setTransform should not affect the current path
ctx.beginPath();
ctx.rect(0,0,100,100);
ctx.save();
ctx.setTransform(0.5, 0, 0, 0.5, 10, 10);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 100, 100);
ctx.restore();
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 100, 100);
imageData = ctx.getImageData(1, 1, 98, 98);
imgdata = imageData.data;
shouldBe("imgdata[4]", "0");
shouldBe("imgdata[5]", "128");
shouldBe("imgdata[6]", "0");
// setTransform should not affect the CTM outside of save() and restore()
ctx.beginPath();
ctx.fillStyle = 'green';
ctx.save();
ctx.setTransform(0.5, 0, 0, 0.5, 0, 0);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 100, 100);
ctx.restore();
ctx.fillRect(0, 0, 100, 100);
imageData = ctx.getImageData(1, 1, 98, 98);
imgdata = imageData.data;
shouldBe("imgdata[4]", "0");
shouldBe("imgdata[5]", "128");
shouldBe("imgdata[6]", "0");
// stop drawing on not-invertible CTM
ctx.beginPath();
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 100, 100);
ctx.setTransform(0, 0, 0, 0, 0, 0);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 100, 100);
imageData = ctx.getImageData(1, 1, 98, 98);
imgdata = imageData.data;
shouldBe("imgdata[4]", "0");
shouldBe("imgdata[5]", "128");
shouldBe("imgdata[6]", "0");
// setTransform with a not-invertible matrix should only stop the drawing up to the next restore()
ctx.beginPath();
ctx.save();
ctx.setTransform(0, 0, 0, 0, 0, 0);
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 100, 100);
ctx.restore();
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 100, 100);
imageData = ctx.getImageData(1, 1, 98, 98);
imgdata = imageData.data;
shouldBe("imgdata[4]", "0");
shouldBe("imgdata[5]", "128");
shouldBe("imgdata[6]", "0");
var successfullyParsed = true;
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