On 2023-08-30, Zbigniew <zbigniew2...@gmail.com> wrote: > „The DisplayHeight macro returns the height of the specified screen > in > pixels. > > The DisplayWidth macro returns the width of the screen in pixels.” > > This is what I want, and this is what — as „man” page states — I > should get, regardless of presence of any „subsystems”. I want nothing > more than is described there.
Your fundamental problem is that you don't know what a screen is. As has been explained several times, a "screen" in X is not a physical display device. Decades ago, there was almost always a 1-1 correspondence between screens and display devices, but you're not writing programs for the 1990s. What you want is the dimensions of a monitor. Until XRANDR, X had no way of providing that. Now it does. > Are you serious when stating, that during creation of a program I > should play guessing game „what kind of 'subsystem' the user may > employ”? No, you don't play a guessing game, you query the server to find out which extensions are in use. This may be a bit tedious, but other programmers have been doing it for twenty years so you can too. If you're not capable of writing and encapsulating a function to achieve what you want, you probably shouldn't be trying to write raw X applications, but should use a suitable toolkit.
