workspace/ksmserver/logouteffect.cpp

   1 /*
   2  * Copyright © 2008 Fredrik Höglund <fredrik@kde.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17  * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 #include <QWidget>
  23 #include <QPixmap>
  24 #include <QX11Info>
  25 #include <X11/Xlib.h>
  26
  27 #include "logouteffect.h"
  28 #include "fadeeffect.h"
  29 #include "curtaineffect.h"
  30
  31 #include <unistd.h> // for gethostname()
  32
  33
  34 static bool localDisplay(Display *dpy)
  35 {
  36     QByteArray display(XDisplayString(dpy));
  37     QByteArray hostPart = display.left(display.indexOf(':'));
  38
  39     if (hostPart.isEmpty())
  40         return true;
  41
  42     if (hostPart == "localhost")
  43         return true;
  44
  45     if (hostPart == "127.0.0.1")
  46         return true;
  47
  48     char name[2048];
  49     gethostname(name, sizeof(name));
  50
  51     if (hostPart == name)
  52        return true;
  53
  54     return false;
  55 }
  56
  57 static bool supportedFormat(const QPixmap *pixmap)
  58 {
  59     int depth = pixmap->depth();
  60     Visual *visual = (Visual*)pixmap->x11Info().visual();
  61
  62     if (ImageByteOrder(pixmap->x11Info().display()) != LSBFirst)
  63         return false;
  64
  65     // Assume this means the pixmap is ARGB32
  66     if (pixmap->hasAlphaChannel())
  67         return true;
  68
  69     // 24/34 bit x8a8r8g8b8
  70     if ((depth == 24 || depth == 32) &&
  71         visual->red_mask   == 0x00ff0000 &&
  72         visual->green_mask == 0x0000ff00 &&
  73         visual->blue_mask  == 0x000000ff)
  74     {
  75         return true;
  76     }
  77
  78     // 16 bit r5g6b5
  79     if (depth == 16 &&
  80         visual->red_mask   == 0xf800 &&
  81         visual->green_mask == 0x07e0 &&
  82         visual->blue_mask  == 0x001f)
  83     {
  84         return true;
  85     }
  86
  87     return false;
  88 }
  89
  90
  91
  92 // ----------------------------------------------------------------------------
  93
  94
  95
  96 LogoutEffect::LogoutEffect(QWidget *parent, QPixmap *pixmap)
  97     : QObject(parent), parent(parent), pixmap(pixmap)
  98 {
  99 }
 100
 101 LogoutEffect::~LogoutEffect()
 102 {
 103 }
 104
 105 LogoutEffect *LogoutEffect::create(QWidget *parent, QPixmap *pixmap)
 106 {
 107     Display *dpy = parent->x11Info().display();
 108
 109     if (!localDisplay(dpy) || !supportedFormat(pixmap))
 110         return new CurtainEffect(parent, pixmap);
 111     else
 112         return new FadeEffect(parent, pixmap);
 113 }
 114
 115