/usr/src/RPM/BUILD/ctwm-4.1.0/xrandr.c

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/*
 * Copyright notice...
 */
 
#include "ctwm.h"
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/extensions/Xrandr.h>
 
#include "r_area_list.h"
#include "r_area.h"
#include "r_layout.h"
#include "xrandr.h"
 
 
/**
 * Use XRANDR to figure out how our monitors are laid out.
 */
RLayout *
XrandrNewLayout(Display *disp, Window rootw)
{
    int i_nmonitors = 0;
    XRRMonitorInfo *ps_monitors;
    char **monitor_names;
    RAreaList *areas;
    int evt_base, err_base, ver_maj, ver_min;
    // XXX *_base and ver_* should move more globally if we start doing
    // randr stuff anywhere else.
 
    // If the server doesn't talk RANDR, we have nothing to do.
    if(XRRQueryExtension(disp, &evt_base, &err_base) != True) {
        // No RANDR
#ifdef DEBUG
        fprintf(stderr, "No RANDR on the server.\n");
#endif
        return NULL;
    }
 
    // XRRGetMonitors() wraps the RRGetMonitors request, which requires
    // 1.5.
    if(XRRQueryVersion(disp, &ver_maj, &ver_min) == 0) {
        // Couldn't get the version
#ifdef DEBUG
        fprintf(stderr, "Couldn't get server RANDR version.\n");
#endif
        return NULL;
    }
    if(ver_maj < 1 || (ver_maj == 1 && ver_min < 5)) {
#ifdef DEBUG
        fprintf(stderr, "Server has RANDR %d.%d, we need 1.5+.\n",
                ver_maj, ver_min);
#endif
        return NULL;
    }
 
    // RANDR 1.5 function to get info about 'em.
    ps_monitors = XRRGetMonitors(disp, rootw, 1, &i_nmonitors);
    if(ps_monitors == NULL || i_nmonitors == 0) {
        fprintf(stderr, "XRRGetMonitors failed\n");
        return NULL;
    }
 
    // Useful note: vtwm also apparently has RANDR support.  It uses
    // XRRGetScreenResources() and looping XRRGetCrtcInfo() to load info
    // about the screen, and its conditionals suggest that's RANDR 1.2.
    // Look into that if we decide to worry about earlier versions.
 
    // Add space for all their names (plus trailing NULL)
    monitor_names = calloc((i_nmonitors + 1), sizeof(char *));
    if(monitor_names == NULL) {
        abort();
    }
 
    // Add each and its name into an RAreaList
    areas = RAreaListNew(i_nmonitors, NULL);
    for(int i = 0; i < i_nmonitors; i++) {
        RArea cur_area = RAreaNew(ps_monitors[i].x,
                                  ps_monitors[i].y,
                                  ps_monitors[i].width,
                                  ps_monitors[i].height);
 
        char *name = XGetAtomName(disp, ps_monitors[i].name);
#ifdef DEBUG
        fprintf(stderr, "NEW area: %s%s",
                name != NULL ? name : "",
                name != NULL ? ":" : "");
        RAreaPrint(&cur_area);
        fprintf(stderr, "\n");
#endif
        if(name != NULL) {
            monitor_names[i] = strdup(name);
            XFree(name);
        }
        else {
            monitor_names[i] = strdup("");
        }
 
        RAreaListAdd(areas, &cur_area);
    }
 
    XRRFreeMonitors(ps_monitors);
 
    // Build up an RLayout of those areas and their names, and hand it
    // back.
    return RLayoutSetMonitorsNames(RLayoutNew(areas), monitor_names);
}