41 lines
959 B
HTML
41 lines
959 B
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<script src="../../resources/js-test-pre.js"></script>
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</head>
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<body>
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<script>
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description("Test the handling of negative sourceRect offset in getImageData().");
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ctx = document.createElement('canvas').getContext('2d');
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ctx.fillStyle = 'red';
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ctx.fillRect(0, 0, 100, 100);
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ctx.fillStyle = 'green';
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ctx.fillRect(0, 0, 6, 6);
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var imageData = ctx.getImageData(-10, 0, 100, 1);
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var imgdata = imageData.data;
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// Fully transparent black
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shouldBe("imgdata[0]", "0");
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shouldBe("imgdata[1]", "0");
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shouldBe("imgdata[2]", "0");
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shouldBe("imgdata[3]", "0");
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// Green
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shouldBe("imgdata[60]", "0");
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shouldBe("imgdata[61]", "128");
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shouldBe("imgdata[62]", "0");
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shouldBe("imgdata[63]", "255");
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// Red
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shouldBe("imgdata[64]", "255");
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shouldBe("imgdata[65]", "0");
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shouldBe("imgdata[66]", "0");
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shouldBe("imgdata[67]", "255");
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</script>
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<script src="../../resources/js-test-post.js"></script>
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</body>
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</html>
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