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 /*****************************************************************************
  *   Copyright 2013 - 2015 Yichao Yu <yyc1992@gmail.com>                     *
  *                                                                           *
  *   This program is free software; you can redistribute it and/or modify    *
  *   it under the terms of the GNU Lesser General Public License as          *
  *   published by the Free Software Foundation; either version 2.1 of the    *
  *   License, or (at your option) version 3, or any later version accepted   *
  *   by the membership of KDE e.V. (or its successor approved by the         *
  *   membership of KDE e.V.), which shall act as a proxy defined in          *
  *   Section 6 of version 3 of the license.                                  *
  *                                                                           *
  *   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       *
  *   Lesser General Public License for more details.                         *
  *                                                                           *
  *   You should have received a copy of the GNU Lesser General Public        *
  *   License along with this library. If not,                                *
  *   see <http://www.gnu.org/licenses/>.                                     *
  *****************************************************************************/
 
 #include "config.h"
 #include "argbhelper.h"
 #include <QDesktopWidget>
 #include <QApplication>
 
 #include <vector>
 
 // Copied from qt_x11_p.h.
 // This is not part of the public API but should be stable enough to use
 // because it had never changed since the first git commit of Qt.
 struct QX11InfoData {
     uint ref;
     int screen;
     int dpiX;
     int dpiY;
     int depth;
     int cells;
     unsigned long colormap;
     void *visual;
     bool defaultColormap;
     bool defaultVisual;
     int subpixel;
 };
 
 namespace QtCurve {
 bool QtcX11Info::creatingDummy = false;
 
 #ifdef Q_WS_X11
 inline QtcX11Info*
 QtcX11Info::getInfo(const QWidget *w)
 {
     return static_cast<QtcX11Info*>(const_cast<QX11Info*>(&w->x11Info()));
 }
 
 // Qt uses XCreateSimpleWindow when defaultVisual and defaultColormap
 // are true. This confuses QGLWidget when recreating window caused by
 // reparenting to a widget with different depth, result in a mismatch
 // in x11info and native window.
 inline void
 QtcX11Info::fixVisual()
 {
     if (qtcUnlikely(!x11data))
         setX11Data(getX11Data(true));
     x11data->defaultVisual = false;
     x11data->defaultColormap = false;
 }
 
 inline void
 QtcX11Info::setRgba()
 {
 #if 1
     setX11Data(getInfo(rgbaDummy())->x11data);
 #else
     // It seems that VirtualBox is doing something special to Qt so that
     // a TranslucentBackground Widget will NOT have a related 32bit window.
     // The following code enables translucent background in Virtualbox by
     // setting rgba visual on the widget anyway. However, this breaks
     // the display of the virtual machine. Since Gammaray does not work either
     // on VirtualBox, it is hard to figure out what is wrong and which are
     // the widgets need to be blacklist. Disable the code for now unless a
     // workaround is found.
     QX11InfoData *xd = getX11Data(true);
     xd->visual = qtcX11RgbaVisual(&xd->colormap, &xd->cells, xd->screen);
     xd->depth = 32;
     xd->defaultVisual = false;
     xd->defaultColormap = false;
     setX11Data(xd);
 #endif
 }
 
 inline QWidget*
 QtcX11Info::rgbaDummy()
 {
     QDesktopWidget *desktop = qApp->desktop();
     static std::vector<QWidget*> dummies(desktop->screenCount(), nullptr);
     int scrno = screen();
     if (qtcUnlikely(!dummies[scrno])) {
         creatingDummy = true;
         dummies[scrno] = new QWidget(desktop->screen(scrno));
         dummies[scrno]->setAttribute(Qt::WA_TranslucentBackground);
         dummies[scrno]->setAttribute(Qt::WA_WState_Polished);
         dummies[scrno]->winId();
         creatingDummy = false;
     }
     return dummies[scrno];
 }
 
 void
 fixVisual(QWidget *widget)
 {
     // Don't use XCreateSimpleWindow
     QtcX11Info::getInfo(widget)->fixVisual();
 }
 
 void
 addAlphaChannel(QWidget *widget)
 {
     QtcX11Info::getInfo(widget)->setRgba();
 }
 #else
 void
 fixVisual(QWidget*)
 {
 }
 
 void
 addAlphaChannel(QWidget*)
 {
 }
 #endif
 
 }