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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * mozilla.org.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <pavlov@pavlov.net>
 *   Joe Hewitt <hewitt@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsCairoScreen.h"

#ifdef MOZ_ENABLE_GTK2
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>
#include <X11/Xatom.h>
#endif

NS_IMPL_ISUPPORTS1(nsCairoScreen, nsIScreen)

nsCairoScreen::nsCairoScreen()
  :
    mScreenNum(0), mRect(0, 0, 0, 0), mAvailRect(0, 0, 0, 0)

{
    NS_INIT_ISUPPORTS();
}


nsCairoScreen::~nsCairoScreen()
{
}

NS_IMETHODIMP
nsCairoScreen::GetRect(PRInt32 *outLeft, PRInt32 *outTop, PRInt32 *outWidth, PRInt32 *outHeight)
{
    *outLeft = mRect.x;
    *outTop = mRect.y;
    *outWidth = mRect.width;
    *outHeight = mRect.height;

    return NS_OK;
}


NS_IMETHODIMP
nsCairoScreen::GetAvailRect(PRInt32 *outLeft, PRInt32 *outTop, PRInt32 *outWidth, PRInt32 *outHeight)
{
    *outLeft = mAvailRect.x;
    *outTop = mAvailRect.y;
    *outWidth = mAvailRect.width;
    *outHeight = mAvailRect.height;

    return NS_OK;
} 

NS_IMETHODIMP 
nsCairoScreen::GetPixelDepth(PRInt32 *aPixelDepth)
{
    *aPixelDepth = 24;
    return NS_OK;
}

NS_IMETHODIMP 
nsCairoScreen::GetColorDepth(PRInt32 *aColorDepth)
{
    return 24;
}


void
nsCairoScreen::Init ()
{
#ifdef MOZ_ENABLE_GTK2
    mAvailRect = mRect = nsRect(0, 0, gdk_screen_width(), gdk_screen_height());
    // We need to account for the taskbar, etc in the available rect.
    // See http://freedesktop.org/Standards/wm-spec/index.html#id2767771

    // XXX It doesn't change that often, but we should probably
    // listen for changes to _NET_WORKAREA.
    // XXX do we care about _NET_WM_STRUT_PARTIAL?  That will
    // add much more complexity to the code here (our screen
    // could have a non-rectangular shape), but should
    // lead to greater accuracy.

#if GTK_CHECK_VERSION(2,2,0)
    GdkWindow *root_window = gdk_get_default_root_window();
#else
    GdkWindow *root_window = GDK_ROOT_PARENT();
#endif // GTK_CHECK_VERSION(2,2,0)

    long *workareas;
    GdkAtom type_returned;
    int format_returned;
    int length_returned;

#if GTK_CHECK_VERSION(2,0,0)
    GdkAtom cardinal_atom = gdk_x11_xatom_to_atom(XA_CARDINAL);
#else
    GdkAtom cardinal_atom = (GdkAtom) XA_CARDINAL;
#endif

    gdk_error_trap_push();

    // gdk_property_get uses (length + 3) / 4, hence G_MAXLONG - 3 here.
    if (!gdk_property_get(root_window,
                          gdk_atom_intern ("_NET_WORKAREA", FALSE),
                          cardinal_atom,
                          0, G_MAXLONG - 3, FALSE,
                          &type_returned,
                          &format_returned,
                          &length_returned,
                          (guchar **) &workareas)) {
        // This window manager doesn't support the freedesktop standard.
        // Nothing we can do about it, so assume full screen size.
        return;
    }

    // Flush the X queue to catch errors now.
    gdk_flush();

    if (!gdk_error_trap_pop() &&
        type_returned == cardinal_atom &&
        length_returned && (length_returned % 4) == 0 &&
        format_returned == 32) {
        int num_items = length_returned / sizeof(long);

        for (int i = 0; i < num_items; i += 4) {
            nsRect workarea(workareas[i],     workareas[i + 1],
                            workareas[i + 2], workareas[i + 3]);
            if (!mRect.Contains(workarea)) {
                NS_WARNING("Invalid bounds");
                continue;
            }

            mAvailRect.IntersectRect(mAvailRect, workarea);
        }
    }

#elif MOZ_ENABLE_XLIB
    mScreenNum = 0;
    mRect.x = mAvailRect.x = 0;
    mRect.y = mAvailRect.y = 0;
    mRect.width = mAvailRect.width = 1600;
    mRect.height = mAvailRect.height = 1200;
#endif
}