MM_TWIPS behaves differently on XP in Parallels!

Here's some MFC code:

// scale the viewport to use twips (1440 units per inch)
pDC->SetMapMode(MM_TWIPS);
pDC->SetMapMode(MM_ANISOTROPIC);
pDC->ScaleViewportExt(1, 1, -1, 1);

// draw a horizontal line 1 inch long
pDC->MoveTo(0, 1000);
pDC->LineTo(1440, 1000);

This produces very different results inside Parallels from what it does on a non-virtual XP install - the line is about 1/3rd of the usual length.

And yet GetDeviceCaps(pDC->m_hDC, LOGPIXELSX) returns the same value on my Parallels install of XP and on real XP machines.

I assume this is some quirk of the display driver? I can provide a test program if anyone is interested in fixing this!

 

This doesn't occur if I uninstall Parallels Tools, so it must be something wrong with the Parallels display driver.

 

Thanks for report! We will check this.

 

Were you able to replicate this? And is there anything I can change to work around it? Thanks.

 

Could you please check this in Build 3106 Beta3 (http://forum.parallels.com/thread7110.html)? We fixed some bugs in video driver there - your problem should be solved as well.