Update gg.c.v screen_size function for Linux and BSD-derivatives

[Wajinn]

Describe the feature

The screen_size function of gg.c.v is non-functional for Linux and BSD-derivative OSes. Suggest using similar code as done by islonely, which comes from Xlib.h (DefaultScreen(dpy)).

Example:

struct Size {
	int width, height;
};

struct Size screen_size() {
	Display *dpy = XOpenDisplay(0);
	int screen = DefaultScreen(dpy);
	struct Size sz = {
		DisplayWidth(dpy, screen),
		DisplayHeight(dpy, screen)
	};
	XCloseDisplay(dpy);
	return sz;
}

Use Case

Will give screen size for Linux and BSD-type OSes.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

V 0.4.8

Environment details (OS name and version, etc.)

Linux and BSD-derivatives

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