Fixed scaling bug

[bvssvni]

Closes #145

[bvssvni]

cc @0e4ef622 @arnodb

[arnodb]

It looks like it's working well, perfect. Feel free to close #148 when this one is merged.

[0e4ef622]

Looks good to me.

[0e4ef622]

Actually I just noticed, shouldn't a Resize event give the new size in points? The docs don't say, and this code is returning the new size in physical pixels. And in the same vein, glutin should be able to handle all the dpi stuff and as I understand it, piston's "points" are equivalent to glutin's "logical pixels", so there really shouldn't be any dpi scaling in this library except for Window::draw_size.

[bvssvni]

@0e4ef622 You're right.

[arnodb]

Interesting, I thought my app was asking for a window size in pixels but, after reading the doc Size is supposed to be in points and WindowSettings is asking for a Size. That means that the app should convert the resize events back to pixels (if eventually it contains points in the future) so that I can pass the pixels to the OpenGL calls. Do you confirm?

[bvssvni]

@arnodb Yes, that's correct. Resize events is supposed to be in points.