MM_TWIPS behaves differently on XP in Parallels!

[danielearwicker]

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!

 

[danielearwicker]

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

 

[Andrew @ Parallels]

Thanks for report! We will check this.

 

[danielearwicker]

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

 

[Andrew @ Parallels]

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.