/**************************************************************************** ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, as the sole copyright ** holder for Qt Designer, grants users of the Qt/Eclipse Integration ** plug-in the right for the Qt/Eclipse Integration to link to ** functionality provided by Qt Designer and its related libraries. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include "qpaintdevice.h" #include "qpainter.h" #include "qwidget.h" #include "qbitmap.h" #include "qapplication.h" #include #include "qx11info_x11.h" /*! \class QPaintDevice \brief The QPaintDevice class is the base class of objects that can be painted. \ingroup multimedia A paint device is an abstraction of a two-dimensional space that can be drawn using a QPainter. Its default coordinate system has its origin located at the top-left position. X increases to the right and Y increases downwards. The unit is one pixel. The drawing capabilities of QPaintDevice are currently implemented by the QWidget, QImage, QPixmap, QGLPixelBuffer, QPicture, and QPrinter subclasses. To implement support for a new backend, you must derive from QPaintDevice and reimplement the virtual paintEngine() function to tell QPainter which paint engine should be used to draw on this particular device. Note that you also must create a corresponding paint engine to be able to draw on the device, i.e derive from QPaintEngine and reimplement its virtual functions. \warning Qt requires that a QApplication object exists before any paint devices can be created. Paint devices access window system resources, and these resources are not initialized before an application object is created. The QPaintDevice class provides several functions returning the various device metrics: The depth() function returns its bit depth (number of bit planes). The height() function returns its height in default coordinate system units (e.g. pixels for QPixmap and QWidget) while heightMM() returns the height of the device in millimeters. Similiarily, the width() and widthMM() functions return the width of the device in default coordinate system units and in millimeters, respectively. Alternatively, the protected metric() function can be used to retrieve the metric information by specifying the desired PaintDeviceMetric as argument. The logicalDpiX() and logicalDpiY() functions return the horizontal and vertical resolution of the device in dots per inch. The physicalDpiX() and physicalDpiY() functions also return the resolution of the device in dots per inch, but note that if the logical and vertical resolution differ, the corresponding QPaintEngine must handle the mapping. Finally, the numColors() function returns the number of different colors available for the paint device. \sa QPaintEngine, QPainter, {The Coordinate System}, {The Paint System} */ /*! \enum QPaintDevice::PaintDeviceMetric Describes the various metrics of a paint device. \value PdmWidth The width of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget). See also width(). \value PdmHeight The height of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget). See also height(). \value PdmWidthMM The width of the paint device in millimeters. See also widthMM(). \value PdmHeightMM The height of the paint device in millimeters. See also heightMM(). \value PdmNumColors The number of different colors available for the paint device. See also numColors(). \value PdmDepth The bit depth (number of bit planes) of the paint device. See also depth(). \value PdmDpiX The horizontal resolution of the device in dots per inch. See also logicalDpiX(). \value PdmDpiY The vertical resolution of the device in dots per inch. See also logicalDpiY(). \value PdmPhysicalDpiX The horizontal resolution of the device in dots per inch. See also physicalDpiX(). \value PdmPhysicalDpiY The vertical resolution of the device in dots per inch. See also physicalDpiY(). \sa metric() */ /*! Constructs a paint device. This constructor can be invoked only from subclasses of QPaintDevice. */ QPaintDevice::QPaintDevice() { painters = 0; } /*! Destroys the paint device and frees window system resources. */ QPaintDevice::~QPaintDevice() { if (paintingActive()) qWarning("QPaintDevice: Cannot destroy paint device that is being " "painted"); extern void qt_painter_removePaintDevice(QPaintDevice *); //qpainter.cpp qt_painter_removePaintDevice(this); } /*! \fn int QPaintDevice::devType() const \internal Returns the device type identifier, which is QInternal::Widget if the device is a QWidget, QInternal::Pixmap if it's a QPixmap, QInternal::Printer if it's a QPrinter, QInternal::Picture if it's a QPicture, or QInternal::UnknownDevice in other cases. */ /*! \fn bool QPaintDevice::paintingActive() const Returns true if the device is currently being painted on, i.e. someone has called QPainter::begin() but not yet called QPainter::end() for this device; otherwise returns false. \sa QPainter::isActive() */ /*! \fn QPaintEngine *QPaintDevice::paintEngine() const Returns a pointer to the paint engine used for drawing on the device. */ /*! \internal Returns the X11 Drawable of the paint device. 0 is returned if it can't be obtained. */ Drawable Q_GUI_EXPORT qt_x11Handle(const QPaintDevice *pd) { if (!pd) return 0; if (pd->devType() == QInternal::Widget) return static_cast(pd)->handle(); else if (pd->devType() == QInternal::Pixmap) return static_cast(pd)->handle(); return 0; } /*! \relates QPaintDevice Returns the QX11Info structure for the \a pd paint device. 0 is returned if it can't be obtained. */ const Q_GUI_EXPORT QX11Info *qt_x11Info(const QPaintDevice *pd) { if (!pd) return 0; if (pd->devType() == QInternal::Widget) return &static_cast(pd)->x11Info(); else if (pd->devType() == QInternal::Pixmap) return &static_cast(pd)->x11Info(); return 0; } /*! \fn int QPaintDevice::metric(PaintDeviceMetric metric) const Returns the metric information for the given paint device \a metric. \sa PaintDeviceMetric */ int QPaintDevice::metric(PaintDeviceMetric) const { qWarning("QPaintDevice::metrics: Device has no metric information"); return 0; } #ifdef QT3_SUPPORT /*! Use QX11Info::display() instead. \oldcode Display *display = widget->x11Display(); \newcode Display *display = widget->x11Info().display(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ Display *QPaintDevice::x11Display() const { return X11->display; } /*! Use QX11Info::screen() instead. \oldcode int screen = widget->x11Screen(); \newcode int screen = widget->x11Info().screen(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11Screen() const { const QX11Info *info = qt_x11Info(this); if (info) return info->screen(); return QX11Info::appScreen(); } /*! Use QX11Info::visual() instead. \oldcode void *visual = widget->x11Visual(); \newcode void *visual = widget->x11Info().visual(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ void *QPaintDevice::x11Visual() const { const QX11Info *info = qt_x11Info(this); if (info) return info->visual(); return QX11Info::appVisual(); } /*! Use QX11Info::depth() instead. \oldcode int depth = widget->x11Depth(); \newcode int depth = widget->x11Info().depth(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11Depth() const { const QX11Info *info = qt_x11Info(this); if (info) return info->depth(); return QX11Info::appDepth(); } /*! Use QX11Info::cells() instead. \oldcode int cells = widget->x11Cells(); \newcode int cells = widget->x11Info().cells(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11Cells() const { const QX11Info *info = qt_x11Info(this); if (info) return info->cells(); return QX11Info::appCells(); } /*! Use QX11Info::colormap() instead. \oldcode unsigned long screen = widget->x11Colormap(); \newcode unsigned long screen = widget->x11Info().colormap(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ Qt::HANDLE QPaintDevice::x11Colormap() const { const QX11Info *info = qt_x11Info(this); if (info) return info->colormap(); return QX11Info::appColormap(); } /*! Use QX11Info::defaultColormap() instead. \oldcode bool isDefault = widget->x11DefaultColormap(); \newcode bool isDefault = widget->x11Info().defaultColormap(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ bool QPaintDevice::x11DefaultColormap() const { const QX11Info *info = qt_x11Info(this); if (info) return info->defaultColormap(); return QX11Info::appDefaultColormap(); } /*! Use QX11Info::defaultVisual() instead. \oldcode bool isDefault = widget->x11DefaultVisual(); \newcode bool isDefault = widget->x11Info().defaultVisual(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ bool QPaintDevice::x11DefaultVisual() const { const QX11Info *info = qt_x11Info(this); if (info) return info->defaultVisual(); return QX11Info::appDefaultVisual(); } /*! Use QX11Info::visual() instead. \oldcode void *visual = QPaintDevice::x11AppVisual(screen); \newcode void *visual = qApp->x11Info(screen).visual(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ void *QPaintDevice::x11AppVisual(int screen) { return QX11Info::appVisual(screen); } /*! Use QX11Info::colormap() instead. \oldcode unsigned long colormap = QPaintDevice::x11AppColormap(screen); \newcode unsigned long colormap = qApp->x11Info(screen).colormap(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ Qt::HANDLE QPaintDevice::x11AppColormap(int screen) { return QX11Info::appColormap(screen); } /*! Use QX11Info::display() instead. \oldcode Display *display = QPaintDevice::x11AppDisplay(); \newcode Display *display = qApp->x11Info().display(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ Display *QPaintDevice::x11AppDisplay() { return QX11Info::display(); } /*! Use QX11Info::screen() instead. \oldcode int screen = QPaintDevice::x11AppScreen(); \newcode int screen = qApp->x11Info().screen(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11AppScreen() { return QX11Info::appScreen(); } /*! Use QX11Info::depth() instead. \oldcode int depth = QPaintDevice::x11AppDepth(screen); \newcode int depth = qApp->x11Info(screen).depth(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11AppDepth(int screen) { return QX11Info::appDepth(screen); } /*! Use QX11Info::cells() instead. \oldcode int cells = QPaintDevice::x11AppCells(screen); \newcode int cells = qApp->x11Info(screen).cells(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11AppCells(int screen) { return QX11Info::appCells(screen); } /*! Use QX11Info::appRootWindow() instead. \oldcode unsigned long window = QPaintDevice::x11AppRootWindow(screen); \newcode unsigned long window = qApp->x11Info(screen).appRootWindow(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ Qt::HANDLE QPaintDevice::x11AppRootWindow(int screen) { return QX11Info::appRootWindow(screen); } /*! Use QX11Info::defaultColormap() instead. \oldcode bool isDefault = QPaintDevice::x11AppDefaultColormap(screen); \newcode bool isDefault = qApp->x11Info(screen).defaultColormap(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ bool QPaintDevice::x11AppDefaultColormap(int screen) { return QX11Info::appDefaultColormap(screen); } /*! Use QX11Info::defaultVisual() instead. \oldcode bool isDefault = QPaintDevice::x11AppDefaultVisual(screen); \newcode bool isDefault = qApp->x11Info(screen).defaultVisual(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ bool QPaintDevice::x11AppDefaultVisual(int screen) { return QX11Info::appDefaultVisual(screen); } /*! Use QX11Info::setAppDpiX() instead. */ void QPaintDevice::x11SetAppDpiX(int dpi, int screen) { QX11Info::setAppDpiX(dpi, screen); } /*! Use QX11Info::setAppDpiY() instead. */ void QPaintDevice::x11SetAppDpiY(int dpi, int screen) { QX11Info::setAppDpiY(dpi, screen); } /*! Use QX11Info::appDpiX() instead. \oldcode bool isDefault = QPaintDevice::x11AppDpiX(screen); \newcode bool isDefault = qApp->x11Info(screen).appDpiX(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11AppDpiX(int screen) { return QX11Info::appDpiX(screen); } /*! Use QX11Info::appDpiY() instead. \oldcode bool isDefault = QPaintDevice::x11AppDpiY(screen); \newcode bool isDefault = qApp->x11Info(screen).appDpiY(); \endcode \sa QWidget::x11Info(), QPixmap::x11Info() */ int QPaintDevice::x11AppDpiY(int screen) { return QX11Info::appDpiY(screen); } #endif /*! \fn int QPaintDevice::width() const Returns the width of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget). \sa widthMM() */ /*! \fn int QPaintDevice::height() const Returns the height of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget). \sa heightMM() */ /*! \fn int QPaintDevice::widthMM() const Returns the width of the paint device in millimeters. \sa width() */ /*! \fn int QPaintDevice::heightMM() const Returns the height of the paint device in millimeters. \sa height() */ /*! \fn int QPaintDevice::numColors() const Returns the number of different colors available for the paint device. Since this value is an int, it will not be sufficient to represent the number of colors on 32 bit displays, in this case INT_MAX is returned instead. */ /*! \fn int QPaintDevice::depth() const Returns the bit depth (number of bit planes) of the paint device. */ /*! \fn int QPaintDevice::logicalDpiX() const Returns the horizontal resolution of the device in dots per inch, which is used when computing font sizes. For X11, this is usually the same as could be computed from widthMM(), but it varies on Windows. Note that if the logicalDpiX() doesn't equal the physicalDpiX(), the corresponding QPaintEngine must handle the resolution mapping. \sa logicalDpiY(), physicalDpiX() */ /*! \fn int QPaintDevice::logicalDpiY() const Returns the vertical resolution of the device in dots per inch, which is used when computing font sizes. For X11, this is usually the same as could be computed from heightMM(), but it varies on Windows. Note that if the logicalDpiY() doesn't equal the physicalDpiY(), the corresponding QPaintEngine must handle the resolution mapping. \sa logicalDpiX(), physicalDpiY() */ /*! \fn int QPaintDevice::physicalDpiX() const Returns the horizontal resolution of the device in dots per inch. Note that if the physicalDpiX() doesn't equal the logicalDpiX(), the corresponding QPaintEngine must handle the resolution mapping. \sa physicalDpiY(), logicalDpiX() */ /*! \fn int QPaintDevice::physicalDpiY() const Returns the horizontal resolution of the device in dots per inch. Note that if the physicalDpiY() doesn't equal the logicalDpiY(), the corresponding QPaintEngine must handle the resolution mapping. \sa physicalDpiX(), logicalDpiY() */