/**************************************************************************** ** ** 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 #include "qpixmap.h" #include "qpixmap_p.h" #include "qbitmap.h" #include "qimage.h" #include "qwidget.h" #include "qpainter.h" #include "qdatastream.h" #include "qbuffer.h" #include "qapplication.h" #include #include "qevent.h" #include "qfile.h" #include "qfileinfo.h" #include "qpixmapcache.h" #include "qdatetime.h" #include "qimagereader.h" #include "qimagewriter.h" #include "qpaintengine.h" #ifdef Q_WS_MAC # include "private/qt_mac_p.h" #endif #if defined(Q_WS_X11) # include "qx11info_x11.h" # include #endif // ### Qt 5: remove typedef void (*_qt_pixmap_cleanup_hook)(int); Q_GUI_EXPORT _qt_pixmap_cleanup_hook qt_pixmap_cleanup_hook = 0; // ### Qt 5: rename typedef void (*_qt_pixmap_cleanup_hook_64)(qint64); Q_GUI_EXPORT _qt_pixmap_cleanup_hook_64 qt_pixmap_cleanup_hook_64 = 0; // ### Qt 5: remove Q_GUI_EXPORT qint64 qt_pixmap_id(const QPixmap &pixmap) { return pixmap.cacheKey(); } /*! \enum QPixmap::ColorMode \compat This enum type defines the color modes that exist for converting QImage objects to QPixmap. It is provided here for compatibility with earlier versions of Qt. Use Qt::ImageConversionFlags instead. \value Auto Select \c Color or \c Mono on a case-by-case basis. \value Color Always create colored pixmaps. \value Mono Always create bitmaps. */ /*! Constructs a null pixmap. \sa isNull() */ QPixmap::QPixmap() : QPaintDevice() { init(0, 0); } /*! \fn QPixmap::QPixmap(int width, int height) Constructs a pixmap with the given \a width and \a height. The content of the pixmap is uninitialized. If either \a width or \a height is zero, a null pixmap is constructed. \sa isNull() */ QPixmap::QPixmap(int w, int h) : QPaintDevice() { init(w, h); } /*! \overload Constructs a pixmap of the given \a size. */ QPixmap::QPixmap(const QSize &size) : QPaintDevice() { init(size.width(), size.height()); } /*! \internal */ QPixmap::QPixmap(const QSize &s, Type type) { init(s.width(), s.height(), type); } /*! Constructs a pixmap from the file with the given \a fileName. If the file does not exist or is of an unknown format, the pixmap becomes a null pixmap. The loader attempts to read the pixmap using the specified \a format. If the \a format is not specified (which is the default), the loader probes the file for a header to guess the file format. The file name can either refer to an actual file on disk or to one of the application's embedded resources. See the \l{resources.html}{Resource System} overview for details on how to embed images and other resource files in the application's executable. If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the \a flags to control the conversion. The \a fileName, \a format and \a flags parameters are passed on to load(). This means that the data in \a fileName is not compiled into the binary. If \a fileName contains a relative path (e.g. the filename only) the relevant file must be found relative to the runtime working directory. \sa {QPixmap#Reading and Writing Image Files}{Reading and Writing Image Files} */ QPixmap::QPixmap(const QString& fileName, const char *format, Qt::ImageConversionFlags flags) : QPaintDevice() { init(0, 0); load(fileName, format, flags); } /*! Constructs a pixmap that is a copy of the given \a pixmap. \sa copy() */ QPixmap::QPixmap(const QPixmap &pixmap) : QPaintDevice() { if (pixmap.paintingActive()) { // make a deep copy data = 0; operator=(pixmap.copy()); } else { data = pixmap.data; data->ref(); } } /*! Constructs a pixmap from the given \a xpm data, which must be a valid XPM image. Errors are silently ignored. Note that it's possible to squeeze the XPM variable a little bit by using an unusual declaration: \code static const char * const start_xpm[]={ "16 15 8 1", "a c #cec6bd", .... \endcode The extra \c const makes the entire definition read-only, which is slightly more efficient (for example, when the code is in a shared library) and ROMable when the application is to be stored in ROM. */ QPixmap::QPixmap(const char * const xpm[]) : QPaintDevice() { init(0, 0); if (!xpm) return; QImage image(xpm); if (!image.isNull()) { if (data->type == BitmapType) *this = QBitmap::fromImage(image); else *this = fromImage(image); } } /*! Destroys the pixmap. */ QPixmap::~QPixmap() { deref(); } /*! \internal */ int QPixmap::devType() const { return QInternal::Pixmap; } /*! \fn QPixmap QPixmap::copy(int x, int y, int width, int height) const \overload Returns a deep copy of the subset of the pixmap that is specified by the rectangle QRect( \a x, \a y, \a width, \a height). */ /*! \fn QPixmap QPixmap::copy(const QRect &rectangle) const Returns a deep copy of the subset of the pixmap that is specified by the given \a rectangle. For more information on deep copies, see the \l {Implicit Data Sharing} documentation. If the given \a rectangle is empty, the whole image is copied. \sa operator=(), QPixmap(), {QPixmap#Pixmap Transformations}{Pixmap Transformations} */ #if defined(Q_WS_WIN) || defined(Q_WS_QWS) QPixmap QPixmap::copy(const QRect &rect) const { QPixmap pm; if (data->type == BitmapType) pm = QBitmap::fromImage(toImage().copy(rect)); else pm = fromImage(toImage().copy(rect)); return pm; } #endif /*! Assigns the given \a pixmap to this pixmap and returns a reference to this pixmap. \sa copy(), QPixmap() */ QPixmap &QPixmap::operator=(const QPixmap &pixmap) { if (paintingActive()) { qWarning("QPixmap::operator=: Cannot assign to pixmap during painting"); return *this; } if (pixmap.paintingActive()) { // make a deep copy *this = pixmap.copy(); } else { pixmap.data->ref(); // avoid 'x = x' deref(); data = pixmap.data; } return *this; } /*! Returns the pixmap as a QVariant. */ QPixmap::operator QVariant() const { return QVariant(QVariant::Pixmap, this); } /*! \fn bool QPixmap::operator!() const Returns true if this is a null pixmap; otherwise returns false. \sa isNull() */ /*! \fn QPixmap::operator QImage() const Returns the pixmap as a QImage. Use the toImage() function instead. */ /*! \fn QMatrix QPixmap::trueMatrix(const QTransform &matrix, int width, int height) Returns the actual matrix used for transforming a pixmap with the given \a width, \a height and \a matrix. When transforming a pixmap using the transformed() function, the transformation matrix is internally adjusted to compensate for unwanted translation, i.e. transformed() returns the smallest pixmap containing all transformed points of the original pixmap. This function returns the modified matrix, which maps points correctly from the original pixmap into the new pixmap. \sa transformed(), {QPixmap#Pixmap Transformations}{Pixmap Transformations} */ QTransform QPixmap::trueMatrix(const QTransform &m, int w, int h) { return QImage::trueMatrix(m, w, h); } /*! \overload This convenience function loads the matrix \a m into a QTransform and calls the overloaded function with the QTransform and the width \a w and the height \a h. */ QMatrix QPixmap::trueMatrix(const QMatrix &m, int w, int h) { return trueMatrix(QTransform(m), w, h).toAffine(); } /*! \fn bool QPixmap::isQBitmap() const Returns true if this is a QBitmap; otherwise returns false. */ /*! \fn bool QPixmap::isNull() const Returns true if this is a null pixmap; otherwise returns false. A null pixmap has zero width, zero height and no contents. You cannot draw in a null pixmap. */ bool QPixmap::isNull() const { return data->w == 0; } /*! \fn int QPixmap::width() const Returns the width of the pixmap. \sa size(), {QPixmap#Pixmap Information}{Pixmap Information} */ int QPixmap::width() const { return data->w; } /*! \fn int QPixmap::height() const Returns the height of the pixmap. \sa size(), {QPixmap#Pixmap Information}{Pixmap Information} */ int QPixmap::height() const { return data->h; } /*! \fn QSize QPixmap::size() const Returns the size of the pixmap. \sa width(), height(), {QPixmap#Pixmap Information}{Pixmap Information} */ QSize QPixmap::size() const { return QSize(data->w,data->h); } /*! \fn QRect QPixmap::rect() const Returns the pixmap's enclosing rectangle. \sa {QPixmap#Pixmap Information}{Pixmap Information} */ QRect QPixmap::rect() const { return QRect(0,0,data->w,data->h); } /*! \fn int QPixmap::depth() const Returns the depth of the pixmap. The pixmap depth is also called bits per pixel (bpp) or bit planes of a pixmap. A null pixmap has depth 0. \sa defaultDepth(), {QPixmap#Pixmap Information}{Pixmap Information} */ int QPixmap::depth() const { return data->d; } /*! \fn void QPixmap::resize(const QSize &size) \overload \compat Use the QPixmap constructor that takes a QSize (\a size) instead. \oldcode pixmap.resize(size); \newcode pixmap = QPixmap(size); \endcode */ #ifdef QT3_SUPPORT void QPixmap::resize_helper(const QSize &s) { int w = s.width(); int h = s.height(); if (w < 1 || h < 1) { *this = QPixmap(); return; } int d = data->d; // Create new pixmap QPixmap pm(QSize(w, h), d == 1 ? BitmapType : PixmapType); #ifdef Q_WS_X11 pm.x11SetScreen(data->xinfo.screen()); #endif // Q_WS_X11 if (!data->uninit && !isNull()) { // has existing pixmap // Copy old pixmap QPainter p(&pm); p.drawPixmap(0, 0, *this, 0, 0, qMin(width(), w), qMin(height(), h)); } #if defined(Q_WS_MAC) #ifndef QT_MAC_NO_QUICKDRAW if(data->qd_alpha) data->macQDUpdateAlpha(); #endif #elif defined(Q_WS_X11) if (data->x11_mask) { pm.data->x11_mask = (Qt::HANDLE)XCreatePixmap(X11->display, RootWindow(data->xinfo.display(), data->xinfo.screen()), w, h, 1); GC gc = XCreateGC(X11->display, pm.data->x11_mask, 0, 0); XCopyArea(X11->display, data->x11_mask, pm.data->x11_mask, gc, 0, 0, qMin(width(), w), qMin(height(), h), 0, 0); XFreeGC(X11->display, gc); } #else if (data->mask) { QBitmap m = *data->mask; m.resize(w, h); pm.setMask(m); } #endif *this = pm; } #endif /*! \fn void QPixmap::resize(int width, int height) \compat Use the QPixmap constructor that takes two \c{int}s (\a width and \a height) instead. \oldcode pixmap.resize(10, 20); \newcode pixmap = QPixmap(10, 20); \endcode */ /*! \fn bool QPixmap::selfMask() const \compat Returns whether the pixmap is its own mask or not. This function is no longer relevant since the concept of self masking doesn't exists anymore. */ #ifndef QT_NO_IMAGE_HEURISTIC_MASK /*! Creates and returns a heuristic mask for this pixmap. The function works by selecting a color from one of the corners and then chipping away pixels of that color, starting at all the edges. If \a clipTight is true (the default) the mask is just large enough to cover the pixels; otherwise, the mask is larger than the data pixels. The mask may not be perfect but it should be reasonable, so you can do things such as the following: \code QPixmap myPixmap; myPixmap->setMask(myPixmap->createHeuristicMask()); \endcode This function is slow because it involves converting to/from a QImage, and non-trivial computations. \sa QImage::createHeuristicMask(), createMaskFromColor() */ QBitmap QPixmap::createHeuristicMask(bool clipTight) const { QBitmap m = QBitmap::fromImage(toImage().createHeuristicMask(clipTight)); return m; } #endif /*! Creates and returns a mask for this pixmap based on the given \a maskColor. If the \a mode is Qt::MaskInColor, all pixels matching the maskColor will be opaque. If \a mode is Qt::MaskOutColor, all pixels matching the maskColor will be transparent. This function is slow because it involves converting to/from a QImage. \sa createHeuristicMask(), QImage::createMaskFromColor() */ QBitmap QPixmap::createMaskFromColor(const QColor &maskColor, Qt::MaskMode mode) const { QImage image = toImage().convertToFormat(QImage::Format_ARGB32); return QBitmap::fromImage(image.createMaskFromColor(maskColor.rgba(), mode)); } /*! \overload Creates and returns a mask for this pixmap based on the given \a maskColor. Same as calling createMaskFromColor(maskColor, Qt::MaskInColor) \sa createHeuristicMask(), QImage::createMaskFromColor() */ QBitmap QPixmap::createMaskFromColor(const QColor &maskColor) const { return createMaskFromColor(maskColor, Qt::MaskInColor); } /*! Loads a pixmap from the file with the given \a fileName. Returns true if the pixmap was successfully loaded; otherwise returns false. The loader attempts to read the pixmap using the specified \a format. If the \a format is not specified (which is the default), the loader probes the file for a header to guess the file format. The file name can either refer to an actual file on disk or to one of the application's embedded resources. See the \l{resources.html}{Resource System} overview for details on how to embed pixmaps and other resource files in the application's executable. If the data needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the \a flags to control the conversion. Note that QPixmaps are automatically added to the QPixmapCache when loaded from a file; the key used is internal and can not be acquired. \sa loadFromData(), {QPixmap#Reading and Writing Image Files}{Reading and Writing Image Files} */ bool QPixmap::load(const QString &fileName, const char *format, Qt::ImageConversionFlags flags) { if (fileName.isEmpty()) return false; QFileInfo info(fileName); QString key = QLatin1String("qt_pixmap_") + info.absoluteFilePath() + QLatin1Char('_') + info.lastModified().toString() + QLatin1Char('_') + QString::number(info.size()) + QLatin1Char('_') + QString::number(data->type); if (QPixmapCache::find(key, *this)) return true; QImage image = QImageReader(fileName, format).read(); if (image.isNull()) return false; QPixmap pm; if (data->type == BitmapType) pm = QBitmap::fromImage(image, flags); else pm = fromImage(image, flags); if (!pm.isNull()) { *this = pm; QPixmapCache::insert(key, *this); return true; } return false; } /*! \fn bool QPixmap::loadFromData(const uchar *data, uint len, const char *format, Qt::ImageConversionFlags flags) Loads a pixmap from the \a len first bytes of the given binary \a data. Returns true if the pixmap was loaded successfully; otherwise returns false. The loader attempts to read the pixmap using the specified \a format. If the \a format is not specified (which is the default), the loader probes the file for a header to guess the file format. If the data needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the \a flags to control the conversion. \sa load(), {QPixmap#Reading and Writing Image Files}{Reading and Writing Image Files} */ bool QPixmap::loadFromData(const uchar *buf, uint len, const char *format, Qt::ImageConversionFlags flags) { QByteArray a = QByteArray::fromRawData(reinterpret_cast(buf), len); QBuffer b(&a); b.open(QIODevice::ReadOnly); QImage image = QImageReader(&b, format).read(); QPixmap pm; if (data->type == BitmapType) pm = QBitmap::fromImage(image, flags); else pm = fromImage(image, flags); if (!pm.isNull()) { *this = pm; return true; } return false; } /*! \fn bool QPixmap::loadFromData(const QByteArray &data, const char *format, Qt::ImageConversionFlags flags) \overload Loads a pixmap from the binary \a data using the specified \a format and conversion \a flags. */ /*! Saves the pixmap to the file with the given \a fileName using the specified image file \a format and \a quality factor. Returns true if successful; otherwise returns false. The \a quality factor must be in the range [0,100] or -1. Specify 0 to obtain small compressed files, 100 for large uncompressed files, and -1 to use the default settings. If \a format is 0, an image format will be chosen from \a fileName's suffix. \sa {QPixmap#Reading and Writing Image Files}{Reading and Writing Image Files} */ bool QPixmap::save(const QString &fileName, const char *format, int quality) const { if (isNull()) return false; // nothing to save QImageWriter writer(fileName, format); return doImageIO(&writer, quality); } /*! \overload This function writes a QPixmap to the given \a device using the specified image file \a format and \a quality factor. This can be used, for example, to save a pixmap directly into a QByteArray: \quotefromfile snippets/image/image.cpp \skipto PIX SAVE \skipto QPixmap \printuntil save */ bool QPixmap::save(QIODevice* device, const char* format, int quality) const { if (isNull()) return false; // nothing to save QImageWriter writer(device, format); return doImageIO(&writer, quality); } /*! \internal */ bool QPixmap::doImageIO(QImageWriter *writer, int quality) const { if (quality > 100 || quality < -1) qWarning("QPixmap::save: quality out of range [-1,100]"); if (quality >= 0) writer->setQuality(qMin(quality,100)); return writer->write(toImage()); } // The implementation (and documentation) of // QPixmap::fill(const QWidget *, const QPoint &) // is in qwidget.cpp /*! \fn void QPixmap::fill(const QWidget *widget, int x, int y) \overload Fills the pixmap with the \a widget's background color or pixmap. The given point, (\a x, \a y), defines an offset in widget coordinates to which the pixmap's top-left pixel will be mapped to. */ /*! \obsolete Returns a number that identifies the contents of this QPixmap object. Distinct QPixmap objects can only have the same serial number if they refer to the same contents (but they don't have to). Use cacheKey() instead. \warning The serial number doesn't necessarily change when the pixmap is altered. This means that it may be dangerous to use it as a cache key. For caching pixmaps, we recommend using the QPixmapCache class whenever possible. */ int QPixmap::serialNumber() const { if (isNull()) return 0; else return data->ser_no; } /*! Returns a number that identifies this QPixmap. Distinct QPixmap objects can only have the same cache key if they refer to the same contents. The cacheKey() will change when the pixmap is altered. */ qint64 QPixmap::cacheKey() const { return (((qint64) data->ser_no) << 32) | ((qint64) (data->detach_no)); } static void sendResizeEvents(QWidget *target) { QResizeEvent e(target->size(), QSize()); QApplication::sendEvent(target, &e); const QObjectList children = target->children(); for (int i = 0; i < children.size(); ++i) { QWidget *child = static_cast(children.at(i)); if (child->isWidgetType() && !child->isWindow() && child->testAttribute(Qt::WA_PendingResizeEvent)) sendResizeEvents(child); } } /*! \fn QPixmap QPixmap::grabWidget(QWidget * widget, const QRect &rectangle) Creates a pixmap and paints the given \a widget, restricted by the given \a rectangle, in it. If the \a widget has any children, then they are also painted in the appropriate positions. If no rectangle is specified (the default) the entire widget is painted. If \a widget is 0, the specified rectangle doesn't overlap the widget's rectangle, or an error occurs, the function will return a null QPixmap. If the rectangle is a superset of the given \a widget, the areas outside the \a widget are covered with the widget's background. This function actually asks \a widget to paint itself (and its children to paint themselves) by calling paintEvent() with painter redirection turned on. But QPixmap also provides the grabWindow() function which is a bit faster grabbing pixels directly off the screen. In addition, if there are overlaying windows, grabWindow(), unlike grabWidget(), will see them. \warning Do not call this function from QWidget::paintEvent(). \sa grabWindow() */ QPixmap QPixmap::grabWidget(QWidget * widget, const QRect &rect) { if (!widget) return QPixmap(); if (widget->testAttribute(Qt::WA_PendingResizeEvent) || !widget->testAttribute(Qt::WA_WState_Created)) sendResizeEvents(widget); QRect r(rect); if (r.width() < 0) r.setWidth(widget->width() - rect.x()); if (r.height() < 0) r.setHeight(widget->height() - rect.y()); if (!r.intersects(widget->rect())) return QPixmap(); QPixmap res(r.size()); widget->render(&res, -r.topLeft(), r, QWidget::DrawWindowBackground | QWidget::DrawChildren | QWidget::IgnoreMask); return res; } /*! \fn QPixmap QPixmap::grabWidget(QWidget *widget, int x, int y, int width, int height) \overload Creates a pixmap and paints the given \a widget, restricted by QRect(\a x, \a y, \a width, \a height), in it. \warning Do not call this function from QWidget::paintEvent(). */ #if defined(Q_WS_X11) || defined(Q_WS_QWS) /*! Returns the pixmap's handle to the device context. Note that, since QPixmap make use of \l {Implicit Data Sharing}{implicit data sharing}, the detach() function must be called explicitly to ensure that only \e this pixmap's data is modified if the pixmap data is shared. \warning This function is X11 specific; using it is non-portable. \sa detach() */ Qt::HANDLE QPixmap::handle() const { return data->hd; } #endif #ifdef QT3_SUPPORT static Qt::ImageConversionFlags colorModeToFlags(QPixmap::ColorMode mode) { Qt::ImageConversionFlags flags = Qt::AutoColor; switch (mode) { case QPixmap::Color: flags |= Qt::ColorOnly; break; case QPixmap::Mono: flags |= Qt::MonoOnly; break; default: break;// Nothing. } return flags; } /*! Use the constructor that takes a Qt::ImageConversionFlag instead. */ QPixmap::QPixmap(const QString& fileName, const char *format, ColorMode mode) : QPaintDevice() { init(0, 0); load(fileName, format, colorModeToFlags(mode)); } /*! Constructs a pixmap from the QImage \a image. Use the static fromImage() function instead. */ QPixmap::QPixmap(const QImage& image) : QPaintDevice() { init(0, 0); if (data->type == BitmapType) *this = QBitmap::fromImage(image); else *this = fromImage(image); } /*! \overload Converts the given \a image to a pixmap that is assigned to this pixmap. Use the static fromImage() function instead. */ QPixmap &QPixmap::operator=(const QImage &image) { if (data->type == BitmapType) *this = QBitmap::fromImage(image); else *this = fromImage(image); return *this; } /*! Use the load() function that takes a Qt::ImageConversionFlag instead. */ bool QPixmap::load(const QString &fileName, const char *format, ColorMode mode) { return load(fileName, format, colorModeToFlags(mode)); } /*! Use the loadFromData() function that takes a Qt::ImageConversionFlag instead. */ bool QPixmap::loadFromData(const uchar *buf, uint len, const char *format, ColorMode mode) { return loadFromData(buf, len, format, colorModeToFlags(mode)); } /*! Use the static fromImage() function instead. */ bool QPixmap::convertFromImage(const QImage &image, ColorMode mode) { if (data->type == BitmapType) *this = QBitmap::fromImage(image, colorModeToFlags(mode)); else *this = fromImage(image, colorModeToFlags(mode)); return !isNull(); } #endif /***************************************************************************** QPixmap stream functions *****************************************************************************/ #if !defined(QT_NO_DATASTREAM) /*! \relates QPixmap Writes the given \a pixmap to the the given \a stream as a PNG image. Note that writing the stream to a file will not produce a valid image file. \sa QPixmap::save(), {Format of the QDataStream Operators} */ QDataStream &operator<<(QDataStream &stream, const QPixmap &pixmap) { return stream << pixmap.toImage(); } /*! \relates QPixmap Reads an image from the given \a stream into the given \a pixmap. \sa QPixmap::load(), {Format of the QDataStream Operators} */ QDataStream &operator>>(QDataStream &stream, QPixmap &pixmap) { QImage image; stream >> image; if (image.isNull()) { pixmap = QPixmap(); } else if (image.depth() == 1) { pixmap = QBitmap::fromImage(image); } else { pixmap = QPixmap::fromImage(image); } return stream; } #endif //QT_NO_DATASTREAM #ifdef QT3_SUPPORT Q_GUI_EXPORT void copyBlt(QPixmap *dst, int dx, int dy, const QPixmap *src, int sx, int sy, int sw, int sh) { Q_ASSERT_X(dst, "::copyBlt", "Destination pixmap must be non-null"); Q_ASSERT_X(src, "::copyBlt", "Source pixmap must be non-null"); if (src->hasAlphaChannel()) { if (dst->paintEngine()->hasFeature(QPaintEngine::PorterDuff)) { QPainter p(dst); p.setCompositionMode(QPainter::CompositionMode_Source); p.drawPixmap(dx, dy, *src, sx, sy, sw, sh); } else { QImage image = dst->toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied); QPainter p(&image); p.setCompositionMode(QPainter::CompositionMode_Source); p.drawPixmap(dx, dy, *src, sx, sy, sw, sh); p.end(); *dst = QPixmap::fromImage(image); } } else { QPainter p(dst); p.drawPixmap(dx, dy, *src, sx, sy, sw, sh); } } #endif /*! \internal */ bool QPixmap::isDetached() const { return data->count == 1; } void QPixmap::deref() { if(data && data->deref()) { // Destroy image if last ref if (qt_pixmap_cleanup_hook_64) qt_pixmap_cleanup_hook_64(cacheKey()); delete data; data = 0; } } /*! \fn QImage QPixmap::convertToImage() const Use the toImage() function instead. */ /*! \fn bool QPixmap::convertFromImage(const QImage &image, Qt::ImageConversionFlags flags) Use the static fromImage() function instead. */ /*! \fn QPixmap QPixmap::xForm(const QMatrix &matrix) const Use transformed() instead. */ /*! \fn QPixmap QPixmap::scaled(int width, int height, Qt::AspectRatioMode aspectRatioMode, Qt::TransformationMode transformMode) const \overload Returns a copy of the pixmap scaled to a rectangle with the given \a width and \a height according to the given \a aspectRatioMode and \a transformMode. If either the \a width or the \a height is zero or negative, this function returns a null pixmap. */ /*! \fn QPixmap QPixmap::scaled(const QSize &size, Qt::AspectRatioMode aspectRatioMode, Qt::TransformationMode transformMode) const Scales the pixmap to the given \a size, using the aspect ratio and transformation modes specified by \a aspectRatioMode and \a transformMode. \image qimage-scaling.png \list \i If \a aspectRatioMode is Qt::IgnoreAspectRatio, the pixmap is scaled to \a size. \i If \a aspectRatioMode is Qt::KeepAspectRatio, the pixmap is scaled to a rectangle as large as possible inside \a size, preserving the aspect ratio. \i If \a aspectRatioMode is Qt::KeepAspectRatioByExpanding, the pixmap is scaled to a rectangle as small as possible outside \a size, preserving the aspect ratio. \endlist If the given \a size is empty, this function returns a null pixmap. \sa isNull(), {QPixmap#Pixmap Transformations}{Pixmap Transformations} */ QPixmap QPixmap::scaled(const QSize& s, Qt::AspectRatioMode aspectMode, Qt::TransformationMode mode) const { if (isNull()) { qWarning("QPixmap::scaled: Pixmap is a null pixmap"); return QPixmap(); } if (s.isEmpty()) return QPixmap(); QSize newSize = size(); newSize.scale(s, aspectMode); if (newSize == size()) return copy(); QPixmap pix; QTransform wm; wm.scale((double)newSize.width() / width(), (double)newSize.height() / height()); pix = transformed(wm, mode); return pix; } /*! \fn QPixmap QPixmap::scaledToWidth(int width, Qt::TransformationMode mode) const Returns a scaled copy of the image. The returned image is scaled to the given \a width using the specified transformation \a mode. The height of the pixmap is automatically calculated so that the aspect ratio of the pixmap is preserved. If \a width is 0 or negative, a null pixmap is returned. \sa isNull(), {QPixmap#Pixmap Transformations}{Pixmap Transformations} */ QPixmap QPixmap::scaledToWidth(int w, Qt::TransformationMode mode) const { if (isNull()) { qWarning("QPixmap::scaleWidth: Pixmap is a null pixmap"); return copy(); } if (w <= 0) return QPixmap(); QTransform wm; double factor = (double) w / width(); wm.scale(factor, factor); return transformed(wm, mode); } /*! \fn QPixmap QPixmap::scaledToHeight(int height, Qt::TransformationMode mode) const Returns a scaled copy of the image. The returned image is scaled to the given \a height using the specified transformation \a mode. The width of the pixmap is automatically calculated so that the aspect ratio of the pixmap is preserved. If \a height is 0 or negative, a null pixmap is returned. \sa isNull(), {QPixmap#Pixmap Transformations}{Pixmap Transformations} */ QPixmap QPixmap::scaledToHeight(int h, Qt::TransformationMode mode) const { if (isNull()) { qWarning("QPixmap::scaleHeight: Pixmap is a null pixmap"); return copy(); } if (h <= 0) return QPixmap(); QTransform wm; double factor = (double) h / height(); wm.scale(factor, factor); return transformed(wm, mode); } /*! \class QPixmap \brief The QPixmap class is an off-screen image representation that can be used as a paint device. \ingroup multimedia \ingroup shared \mainclass Qt provides four classes for handling image data: QImage, QPixmap, QBitmap and QPicture. QImage is designed and optimized for I/O, and for direct pixel access and manipulation, while QPixmap is designed and optimized for showing images on screen. QBitmap is only a convenience class that inherits QPixmap, ensuring a depth of 1. The isQBitmap() function returns true if a QPixmap object is really a bitmap, otherwise returns false. Finally, the QPicture class is a paint device that records and replays QPainter commands. A QPixmap can easily be displayed on the screen using QLabel or one of QAbstractButton's subclasses (such as QPushButton and QToolButton). QLabel has a pixmap property, whereas QAbstractButton has an icon property. And because QPixmap is a QPaintDevice subclass, QPainter can be used to draw directly onto pixmaps. In addition to the ordinary constructors, a QPixmap can be constructed using the static grabWidget() and grabWindow() functions which creates a QPixmap and paints the given widget, or window, in it. Note that the pixel data in a pixmap is internal and is managed by the underlying window system. Pixels can only be accessed through QPainter functions or by converting the QPixmap to a QImage. Depending on the system, QPixmap is stored using a RGB32 or a premultiplied alpha format. If the image has an alpha channel, and if the system allows, the preferred format is premultiplied alpha. Note also that QPixmap, unlike QImage, may be hardware dependent. On X11 and Mac, a QPixmap is stored on the server side while a QImage is stored on the client side (on Windows, these two classes have an equivalent internal representation, i.e. both QImage and QPixmap are stored on the client side and don't use any GDI resources). There are functions to convert between QImage and QPixmap. Typically, the QImage class is used to load an image file, optionally manipulating the image data, before the QImage object is converted into a QPixmap to be shown on screen. Alternatively, if no manipulation is desired, the image file can be loaded directly into a QPixmap. On Windows, the QPixmap class also supports conversion between \c HBITMAP and QPixmap. QPixmap provides a collection of functions that can be used to obtain a variety of information about the pixmap. In addition, there are several functions that enables transformation of the pixmap. QPixmap objects can be passed around by value since the QPixmap class uses implicit data sharing. For more information, see the \l {Implicit Data Sharing} documentation. QPixmap objects can also be streamed. \tableofcontents \section1 Reading and Writing Image Files QPixmap provides several ways of reading an image file: The file can be loaded when constructing the QPixmap object, or by using the load() or loadFromData() functions later on. When loading an image, the file name can either refer to an actual file on disk or to one of the application's embedded resources. See \l{The Qt Resource System} overview for details on how to embed images and other resource files in the application's executable. Simply call the save() function to save a QPixmap object. The complete list of supported file formats are available through the QImageReader::supportedImageFormats() and QImageWriter::supportedImageFormats() functions. New file formats can be added as plugins. By default, Qt supports the following formats: \table \header \o Format \o Description \o Qt's support \row \o BMP \o Windows Bitmap \o Read/write \row \o GIF \o Graphic Interchange Format (optional) \o Read \row \o JPG \o Joint Photographic Experts Group \o Read/write \row \o JPEG \o Joint Photographic Experts Group \o Read/write \row \o PNG \o Portable Network Graphics \o Read/write \row \o PBM \o Portable Bitmap \o Read \row \o PGM \o Portable Graymap \o Read \row \o PPM \o Portable Pixmap \o Read/write \row \o XBM \o X11 Bitmap \o Read/write \row \o XPM \o X11 Pixmap \o Read/write \endtable (To configure Qt with GIF support, pass \c -qt-gif to the \c configure script or check the appropriate option in the graphical installer.) \section1 Pixmap Information QPixmap provides a collection of functions that can be used to obtain a variety of information about the pixmap: \table \header \o \o Available Functions \row \o Geometry \o The size(), width() and height() functions provide information about the pixmap's size. The rect() function returns the image's enclosing rectangle. \row \o Alpha component \o The hasAlphaChannel() returns true if the pixmap has a format that respects the alpha channel, otherwise returns false, while the hasAlpha() function returns true if the pixmap has an alpha channel \e or a mask (otherwise false). The alphaChannel() function returns the alpha channel as a new QPixmap object, while the mask() function returns the mask as a QBitmap object. The alpha channel and mask can be set using the setAlphaChannel() and setMask() functions, respectively. \row \o Low-level information \o The depth() function returns the depth of the pixmap. The defaultDepth() function returns the default depth, i.e. the depth used by the application on the given screen. The cacheKey() function returns a number that uniquely identifies the contents of the QPixmap object. The x11Info() function returns information about the configuration of the X display used to display the widget. The x11PictureHandle() function returns the X11 Picture handle of the pixmap for XRender support. Note that the two latter functions are only available on x11. \endtable \section1 Pixmap Conversion A QPixmap object can be converted into a QImage using the toImage() function. Likewise, a QImage can be converted into a QPixmap using the fromImage(). If this is too expensive an operation, you can use QBitmap::fromImage() instead. In addition, on Windows, the QPixmap class supports conversion to and from HBitmap: the toWinHBITMAP() function creates a HBITMAP equivalent to the QPixmap, based on the given HBitmapFormat, and returns the HBITMAP handle. The fromWinHBITMAP() function returns a QPixmap that is equivalent to the given bitmap which has the specified format. \section1 Pixmap Transformations QPixmap supports a number of functions for creating a new pixmap that is a transformed version of the original: The createHeuristicMask() function creates and returns a 1-bpp heuristic mask (i.e. a QBitmap) for this pixmap. It works by selecting a color from one of the corners and then chipping away pixels of that color, starting at all the edges. The createMaskFromColor() function creates and returns a mask (i.e. a QBitmap) for the pixmap based on a given color. The scaled(), scaledToWidth() and scaledToHeight() functions return scaled copies of the pixmap, while the copy() function creates a QPixmap that is a plain copy of the original one. The transformed() function returns a copy of the pixmap that is transformed with the given transformation matrix and transformation mode: Internally, the transformation matrix is adjusted to compensate for unwanted translation, i.e. transformed() returns the smallest pixmap containing all transformed points of the original pixmap. The static trueMatrix() function returns the actual matrix used for transforming the pixmap. There are also functions for changing attributes of a pixmap. in-place: The fill() function fills the entire image with the given color, the setMask() function sets a mask bitmap, and the setAlphaChannel() function sets the pixmap's alpha channel. \sa QBitmap, QImage, QImageReader, QImageWriter */ /*! \typedef QPixmap::DataPtr \internal */ /*! \fn DataPtr &QPixmap::data_ptr() \internal */