SalGraphics::mirror() question

[Chris Sherlock]

Hi all,

Some time ago, all the SalGraphics::mirror() functions added a check to get
the width from OutputDevice::GetOutWidthPixel() if the class is
VirtualDevice.

My questions are:

1. Why is this necessary?
2. What is the difference between SalGraphics::GetGraphicsWidth() and
OutputDevice::GetOutWidthPixel()?

Any insights here would be really helpful!

Chris
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