workspace/kcontrol/input/xcursor/cursortheme.cpp

   1 /*
   2  * Copyright © 2006-2007 Fredrik Höglund <fredrik@kde.org>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License version 2 or at your option version 3 as published
   7  * by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; see the file COPYING.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include <QApplication>
  21 #include <QStyle>
  22 #include <QCursor>
  23 #include <QImage>
  24 #include <QFile>
  25 #include <QX11Info>
  26
  27 #include "themepage.h"
  28 #include "cursortheme.h"
  29
  30 #include <config-X11.h>
  31
  32 #ifdef HAVE_XFIXES
  33 #  include <X11/Xlib.h>
  34 #  include <X11/extensions/Xfixes.h>
  35 #endif
  36
  37
  38 CursorTheme::CursorTheme(const QString &title, const QString &description)
  39 {
  40     setTitle(title);
  41     setDescription(description);
  42     setSample("left_ptr");
  43     setIsHidden(false);
  44     setIsWritable(false);
  45 }
  46
  47
  48 QPixmap CursorTheme::icon() const
  49 {
  50     if (m_icon.isNull())
  51         m_icon = createIcon();
  52
  53     return m_icon;
  54 }
  55
  56
  57 QImage CursorTheme::autoCropImage(const QImage &image) const
  58 {
  59     // Compute an autocrop rectangle for the image
  60     QRect r(image.rect().bottomRight(), image.rect().topLeft());
  61     const quint32 *pixels = reinterpret_cast<const quint32*>(image.bits());
  62
  63     for (int y = 0; y < image.height(); y++)
  64     {
  65         for (int x = 0; x < image.width(); x++)
  66         {
  67             if (*(pixels++))
  68             {
  69                 if (x < r.left())   r.setLeft(x);
  70                 if (x > r.right())  r.setRight(x);
  71                 if (y < r.top())    r.setTop(y);
  72                 if (y > r.bottom()) r.setBottom(y);
  73             }
  74         }
  75     }
  76
  77     // Normalize the rectangle
  78     return image.copy(r.normalized());
  79 }
  80
  81
  82 QPixmap CursorTheme::loadPixmap(const QString &name, int size) const
  83 {
  84     QImage image = loadImage(name, size);
  85     if (image.isNull())
  86         return QPixmap();
  87
  88     return QPixmap::fromImage(image);
  89 }
  90
  91
  92 static int nominalCursorSize(int iconSize)
  93 {
  94     for (int i = 512; i > 8; i /= 2)
  95     {
  96         if (i < iconSize)
  97             return i;
  98
  99         if ((i * .75) < iconSize)
 100             return int(i * .75);
 101     }
 102
 103     return 8;
 104 }
 105
 106
 107 QPixmap CursorTheme::createIcon() const
 108 {
 109     int iconSize = QApplication::style()->pixelMetric(QStyle::PM_LargeIconSize);
 110     int cursorSize = nominalCursorSize(iconSize);
 111     QSize size = QSize(iconSize, iconSize);
 112
 113     QPixmap pixmap;
 114     QImage image = loadImage(sample(), cursorSize);
 115
 116     if (image.isNull() && sample() != "left_ptr")
 117         image = loadImage("left_ptr", cursorSize);
 118
 119     if (!image.isNull())
 120     {
 121         // Scale the image if it's larger than the preferred icon size
 122         if (image.width() > size.width() || image.height() > size.height())
 123             image = image.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
 124
 125         pixmap = QPixmap::fromImage(image);
 126     }
 127
 128     return pixmap;
 129 }
 130
 131 void CursorTheme::setCursorName(QCursor &cursor, const QString &name) const
 132 {
 133 #ifdef HAVE_XFIXES
 134     static bool haveXfixes = ThemePage::haveXfixes();
 135
 136     if (haveXfixes)
 137     {
 138         XFixesSetCursorName(QX11Info::display(), cursor.handle(),
 139                             QFile::encodeName(name));
 140     }
 141 #endif
 142 }
 143