/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

#include "kwinglobals.h"

#include <config-workspace.h>
#include <config-X11.h>

#include <assert.h>

#include <kdebug.h>

#include <X11/Xlib.h>
#include <X11/extensions/shape.h>

#ifdef HAVE_XRENDER
#include <X11/extensions/Xrender.h>
#endif
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif
#ifdef HAVE_XDAMAGE
#include <X11/extensions/Xdamage.h>
#endif
#ifdef HAVE_XRANDR
#include <X11/extensions/Xrandr.h>
#endif
#ifdef HAVE_XCOMPOSITE
#include <X11/extensions/Xcomposite.h>
#endif
#ifdef HAVE_OPENGL
#include <GL/glx.h>
#endif
#ifdef HAVE_XSYNC
#include <X11/extensions/sync.h>
#endif

namespace KWin
{

int Extensions::shape_version = 0;
int Extensions::shape_event_base = 0;
bool Extensions::has_randr = false;
int Extensions::randr_event_base = 0;
bool Extensions::has_damage = false;
int Extensions::damage_event_base = 0;
int Extensions::composite_version = 0;
int Extensions::fixes_version = 0;
int Extensions::render_version = 0;
bool Extensions::has_glx = false;
bool Extensions::has_sync = false;
int Extensions::sync_event_base = 0;
// for fillExtensionsData()
const char* Extensions::data_extensions[ 32 ];
int Extensions::data_nextensions;
int Extensions::data_opcodes[ 32 ];
int Extensions::data_error_bases[ 32 ];

void Extensions::addData( const char* name )
    {
    assert( data_nextensions < 32 );
    int opcode, event_base, error_base;
    XQueryExtension( display(), name, &opcode, &event_base, &error_base );
    data_extensions[ data_nextensions ] = name;
    data_opcodes[ data_nextensions ] = opcode;
    data_error_bases[ data_nextensions ] = error_base;
    ++data_nextensions;
    }

void Extensions::init()
    {
    int event_base, error_base;
    data_nextensions = 0;
    shape_version = 0;
    if( XShapeQueryExtension( display(), &shape_event_base, &error_base ))
        {
        int major, minor;
        if( XShapeQueryVersion( display(), &major, &minor ))
            {
            shape_version = major * 0x10 + minor;
            addData( "SHAPE" );
            }
        }
#ifdef HAVE_XRANDR
    has_randr = XRRQueryExtension( display(), &randr_event_base, &error_base );
    if( has_randr )
        {
        int major, minor;
        XRRQueryVersion( display(), &major, &minor );
        has_randr = ( major > 1 || ( major == 1 && minor >= 1 ) );
        addData( "RANDR" );
        }
#else
    has_randr = false;
#endif
#ifdef HAVE_XDAMAGE
    has_damage = XDamageQueryExtension( display(), &damage_event_base, &error_base );
    if( has_damage )
        addData( "DAMAGE" );
#else
    has_damage = false;
#endif
    composite_version = 0;
#ifdef HAVE_XCOMPOSITE
    if( XCompositeQueryExtension( display(), &event_base, &error_base ))
        {
        int major = 0, minor = 0;
        XCompositeQueryVersion( display(), &major, &minor );
        composite_version = major * 0x10 + minor;
        addData( "Composite" );
        }
#endif
    fixes_version = 0;
#ifdef HAVE_XFIXES
    if( XFixesQueryExtension( display(), &event_base, &error_base ))
        {
        int major = 0, minor = 0;
        XFixesQueryVersion( display(), &major, &minor );
        fixes_version = major * 0x10 + minor;
        addData( "XFIXES" );
        }
#endif
    render_version = 0;
#ifdef HAVE_XRENDER
    if( XRenderQueryExtension( display(), &event_base, &error_base ))
        {
        int major = 0, minor = 0;
        XRenderQueryVersion( display(), &major, &minor );
        render_version = major * 0x10 + minor;
        addData( "RENDER" );
        }
#endif
    has_glx = false;
#ifdef HAVE_OPENGL
#ifndef KWIN_HAVE_OPENGLES
    has_glx = glXQueryExtension( display(), &event_base, &error_base );
    if( has_glx )
        addData( "GLX" );
#endif
#endif
#ifdef HAVE_XSYNC
    if( XSyncQueryExtension( display(), &sync_event_base, &error_base ))
        {
        int major = 0, minor = 0;
        if( XSyncInitialize( display(), &major, &minor ))
            {
            has_sync = true;
            addData( "SYNC" );
            }
        }
#endif
    kDebug( 1212 ) << "Extensions: shape: 0x" << QString::number( shape_version, 16 )
        << " composite: 0x" << QString::number( composite_version, 16 )
        << " render: 0x" << QString::number( render_version, 16 )
        << " fixes: 0x" << QString::number( fixes_version, 16 ) << endl;
    }

void Extensions::fillExtensionsData( const char**& extensions, int& nextensions, int*&opcodes, int*& error_bases )
    {
    extensions = data_extensions;
    nextensions = data_nextensions;
    opcodes = data_opcodes;
    error_bases = data_error_bases;
    }

int Extensions::shapeNotifyEvent()
    {
    return shape_event_base + ShapeNotify;
    }

// does the window w need a shape combine mask around it?
bool Extensions::hasShape( Window w )
    {
    int xws, yws, xbs, ybs;
    unsigned int wws, hws, wbs, hbs;
    int boundingShaped = 0, clipShaped = 0;
    if( !shapeAvailable())
        return false;
    XShapeQueryExtents(display(), w,
                       &boundingShaped, &xws, &yws, &wws, &hws,
                       &clipShaped, &xbs, &ybs, &wbs, &hbs);
    return boundingShaped != 0;
    }

bool Extensions::shapeInputAvailable()
    {
    return shape_version >= 0x11; // 1.1
    }

int Extensions::randrNotifyEvent()
    {
#ifdef HAVE_XRANDR
    return randr_event_base + RRScreenChangeNotify;
#else
    return 0;
#endif
    }

int Extensions::damageNotifyEvent()
    {
#ifdef HAVE_XDAMAGE
    return damage_event_base + XDamageNotify;
#else
    return 0;
#endif
    }

bool Extensions::compositeOverlayAvailable()
    {
    return composite_version >= 0x03; // 0.3
    }

bool Extensions::fixesRegionAvailable()
    {
    return fixes_version >= 0x30; // 3
    }

int Extensions::syncAlarmNotifyEvent()
    {
#ifdef HAVE_XSYNC
    return sync_event_base + XSyncAlarmNotify;
#else
    return 0;
#endif
    }

} // namespace