22 lines
726 B
JavaScript
22 lines
726 B
JavaScript
description("Series of tests to ensure correct behaviour of getImageData and putImageData when alpha is involved");
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var ctx = document.getElementById('canvas').getContext('2d');
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ctx.fillStyle = 'rgba(255, 0, 0, 0.01)';
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ctx.fillRect(0, 0, 1, 200);
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ctx.fillStyle = 'rgba(0, 255, 0, 0.995)';
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ctx.fillRect(1, 0, 199, 200);
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var imageData = ctx.getImageData(0, 0, 200, 200);
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var imgdata = imageData.data;
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shouldBe("imgdata[4]", "0");
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shouldBe("imgdata[5]", "255");
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shouldBe("imgdata[6]", "0");
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shouldBe("imgdata[7]", "254");
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ctx.putImageData(imageData, 0, 0);
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imgdata = ctx.getImageData(0, 0, 200, 200).data;
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shouldBe("imgdata[4]", "0");
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shouldBe("imgdata[5]", "255");
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shouldBe("imgdata[6]", "0");
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shouldBe("imgdata[7]", "254");
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