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Fix failure to print when pages contain zero-sized <canvas> element.

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Fixes #1058
This commit is contained in:
Gaming4JC 2019-04-26 19:46:37 -04:00 • committed by Roy Tam
commit 852ce8292d
1 changed files with 17 additions and 11 deletions
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6
dom/html/HTMLCanvasElement.cpp
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@ -552,6 +552,11 @@ HTMLCanvasElement::CopyInnerTo(Element* aDest)
HTMLCanvasElement* dest = static_cast<HTMLCanvasElement*>(aDest);
dest->mOriginalCanvas = this;
// We make sure that the canvas is not zero sized since that would cause
// the DrawImage call below to return an error, which would cause printing
// to fail.
nsIntSize size = GetWidthHeight();
if (size.height > 0 && size.width > 0) {
nsCOMPtr<nsISupports> cxt;
dest->GetContext(NS_LITERAL_STRING("2d"), getter_AddRefs(cxt));
RefPtr<CanvasRenderingContext2D> context2d =
@ -565,6 +570,7 @@ HTMLCanvasElement::CopyInnerTo(Element* aDest)
rv = err.StealNSResult();
}
}
}
return rv;
}