commit - cc9547960e7cf12129e84c9489eb5dcd6235144b
commit + 58b1904e3eec4d80a9a30e4267d902b523351aec
blob - c6389e9ba8bc1d7f562bd95c750a7dad92c7aac8
blob + f77186129fde313b2f6422b2b34d7f33bc8dcc21
--- src/cmd/devdraw/cocoa-screen.m
+++ src/cmd/devdraw/cocoa-screen.m
[win.img setSize: ptsize];
win.topixelscale = size.width / ptsize.width;
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;
}