screentest.go

package main

import (
	"fmt"
	"log"
	"github.com/BurntSushi/xgb"
	"github.com/BurntSushi/xgb/xproto"
	"github.com/BurntSushi/xgb/xinerama"
)

func main() {
	X, err := xgb.NewConn()
	if err != nil {
		log.Fatal(err)
	}
	defer X.Close()
	
	// xinerama
	for {
		err = xinerama.Init(X)
		if err != nil {
			fmt.Println(err)
			break
		}
	
		reply, err := xinerama.QueryScreens(X).Reply()
		if err != nil {
			fmt.Println(err)
			break
		}
		
		if reply.Number >= 2 {
			// multiple xinerama heads
			fmt.Println("Using", reply.Number, "xinerama heads")
			for i, screen := range reply.ScreenInfo {
				fmt.Printf("%d\tX: %d\tY: %d\tWidth: %d\tHeight: %d\n",
					i, screen.XOrg, screen.YOrg, screen.Width, screen.Height)
			}
			return
		}
		
		break
	}

	// xproto
	setupInfo := xproto.Setup(X)
	if setupInfo == nil {
		log.Fatal("Failed to retrieve X setup info.")
	}
	
	// no multiple xinerama heads, 
	fmt.Println("Using", len(setupInfo.Roots), "screens")
	for _, s := range setupInfo.Roots {
		fmt.Println(s.WidthInPixels, s.HeightInPixels)
	}
}