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devdraw: fake dpi calculation on Mac

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R=rsc
http://codereview.appspot.com/6782115
This commit is contained in:
Russ Cox 2012-11-25 23:55:27 -05:00
parent cc9547960e
commit 58b1904e3e
1 changed files with 8 additions and 0 deletions
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8
src/cmd/devdraw/cocoa-screen.m
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@ -396,6 +396,14 @@ initimg(void)
[win.img setSize: ptsize]; [win.img setSize: ptsize];
win.topixelscale = size.width / ptsize.width; win.topixelscale = size.width / ptsize.width;
win.topointscale = 1.0f / win.topixelscale; win.topointscale = 1.0f / win.topixelscale;
// NOTE: This is not really the display DPI.
// On retina, topixelscale is 2; otherwise it is 1.
// This formula gives us 220 for retina, 110 otherwise.
// That's not quite right but it's close to correct.
// http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density#Apple
displaydpi = win.topixelscale * 110;
return i; return i;
} }