зеркало из https://github.com/mozilla/gecko-dev.git
42 строки
1.0 KiB
HTML
42 строки
1.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<body>
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<div>
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<canvas id="c1" width="400" height="400"></canvas>
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<canvas id="c2" width="400" height="400"></canvas>
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</div>
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<script type="text/javascript">
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var canv1 = document.getElementById('c1');
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var canv2 = document.getElementById('c2');
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var ctx1 = canv1.getContext('2d');
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var ctx2 = canv2.getContext('2d');
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ctx1.strokeStyle = '#FF0000';
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ctx1.moveTo(10, 10);
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ctx1.lineTo(390, 390);
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ctx1.stroke();
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function doTest()
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{
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// Save img data
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var imgData = ctx1.getImageData(0, 0, canv1.width, canv1.height);
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// Resize canvas - seems to cause the bug
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canv1.width = 0;
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canv1.height = 0;
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canv1.width = 400;
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canv1.height = 400;
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// Put image data from ctx1 to ctx2
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ctx2.putImageData(imgData, 0, 0);
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// Draw canvas2 on canvas1
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ctx1.drawImage(canv2, 0, 0);
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};
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doTest();
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doTest();
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</script>
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</body>
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</html>
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