File: nv-control-screen.h

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/*
 * Copyright (c) 2010 NVIDIA Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * nv-control-screen.h - trivial helper for NV-CONTROL sample clients: use
 * the default screen if it is an NVIDIA X screen.  If it isn't, then look
 * for the first NVIDIA X screen.  Abort if no NVIDIA X screens are found.
 */

#ifndef __NV_CONTROL_SCREEN_H__
#define __NV_CONTROL_SCREEN_H__

#include <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>

#include "NVCtrlLib.h"

static inline int GetNvXScreen(Display *dpy)
{
    int defaultScreen, screen;

    defaultScreen = DefaultScreen(dpy);

    if (XNVCTRLIsNvScreen(dpy, defaultScreen)) {
        return defaultScreen;
    }

    for (screen = 0; screen < ScreenCount(dpy); screen++) {
        if (XNVCTRLIsNvScreen(dpy, screen)) {
            printf("Default X screen %d is not an NVIDIA X screen.  "
                   "Using X screen %d instead.\n",
                   defaultScreen, screen);
            return screen;
        }
    }

    fprintf(stderr, "Unable to find any NVIDIA X screens; aborting.\n");

    exit(1);
}

#endif /* __NV_CONTROL_SCREEN_H__ */