Open
Bug 557522
Opened 15 years ago
Updated 3 years ago
canvas scales images with a 1px width weirdly
Categories
(Core :: Graphics, defect)
Tracking
()
NEW
People
(Reporter: ma.mazmaz, Unassigned)
Details
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7 (.NET CLR 3.5.30729)
If one tries to scale an image with an initial width of 1px, then the image looks weird on the canvas and is semi-transparent.
Reproducible: Always
Steps to Reproduce:
Use the following code:
<!DOCTYPE HTML>
<html>
<head>
<title>Test</title>
<script type="text/javascript">
window.onload=function(){
window.can=document.getElementById("can");
window.ctx=can.getContext('2d');
window.img=new Image();
img.onload=function(){
ctx.drawImage(img,0,0,800,img.height);
};
img.src="http://maz.github.com/OpenBear/ob/themes/Default/selection.png";
};
</script>
</head>
<body>
<h1>What happens:</h1><br/>
<canvas id="can" width="800" height="100" style="background-color:red"></canvas>
<h1>What should happen:<h1>
<img src="http://maz.github.com/OpenBear/ob/themes/Default/selection.png" style="background-color:red" alt="an image" height="36" width="800"/>
</body>
</html>
Actual Results:
The image scaled with the canvas looks bad (and is scaled improperly).
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Updated•15 years ago
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Component: General → Canvas: 2D
Product: Firefox → Core
QA Contact: general → canvas.2d
Version: unspecified → 1.9.0 Branch
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Comment 1•15 years ago
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Worksforme on Mac, but I definitely see this on Windows.
Status: UNCONFIRMED → NEW
Component: Canvas: 2D → Graphics
Ever confirmed: true
QA Contact: canvas.2d → thebes
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Comment 2•15 years ago
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Presumably because we don't use EXTEND_PAD in canvas?
Oh, why don't we?
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Comment 4•15 years ago
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I can't really think of any reason. Vlad?
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Updated•3 years ago
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Severity: normal → S3
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Description
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