QBitmap(3qt)QBitmap(3qt)NAME
QBitmap - Monochrome (1 bit depth) pixmaps
#include <qbitmap.h>
Inherits QPixmap.
Public Members
QBitmap ()
QBitmap ( int w, int h, bool clear = FALSE,
QPixmap::Optimization = QPixmap::DefaultOptim )
QBitmap ( const QSize &, bool clear = FALSE,
QPixmap::Optimization = QPixmap::DefaultOptim )
QBitmap ( int w, int h, const uchar * bits, bool
isXbitmap=FALSE )
QBitmap ( const QSize &, const uchar * bits, bool
isXbitmap=FALSE )
QBitmap ( const QBitmap & )
QBitmap ( const QString & fileName, const char * format=0
)
QBitmap& operator= ( const QBitmap & )
QBitmap& operator= ( const QPixmap & )
QBitmap& operator= ( const QImage & )
QBitmap xForm ( const QWMatrix & ) const
DESCRIPTION
The QBitmap class provides monochrome (1 bit depth)
pixmaps.
The QBitmap class is a monochrome off-screen paint device,
used mainly for creating custom QCursor and QBrush
objects, in QPixmap::setMask() and for QRegion.
A QBitmap is a QPixmap with a QPixmap::depth() of 1. If a
pixmap with a depth greater than 1 is assigned to a
bitmap, the bitmap will be automatically dithered. A
QBitmap is guaranteed to always have the depth 1, unless
it is QPixmap::isNull() (has depth 0).
When drawing in a QBitmap (or QPixmap with depth 1), we
recommend using the QColor objects Qt::color0 and
Qt::color1. Painting with color0 sets the bitmap bits to
0, and painting with color1 sets the bits to 1. For a
bitmap, 0-bits indicate background (or white) and 1-bits
indicate foreground (or black). Using the black and white
QColor objects make no sense, because the QColor::pixel()
value is not necessarily 0 for black and 1 for white.
Just like the QPixmap class, QBitmap is optimized by the
use of implicit sharing, so it is very efficient to pass
QBitmap objects as arguments.
See also QPixmap, QPainter::drawPixmap(), bitBlt() and
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QBitmap(3qt)QBitmap(3qt)
Shared Classes
Examples: cursor/cursor.cpp
MEMBER FUNCTION DOCUMENTATIONQBitmap::QBitmap ()
Constructs a null bitmap.
See also QPixmap::isNull().
QBitmap::QBitmap ( const QString & fileName, const char *
format=0 )
Constructs a pixmap from the file fileName. If the file
does not exist, or is of an unknown format, the pixmap
becomes a null pixmap.
The parameters are passed on to QPixmap::load(). Dithering
will be performed if the file format uses more than 1 bit
per pixel.
See also QPixmap::isNull(), QPixmap::load(),
QPixmap::loadFromData(), QPixmap::save() and
QPixmap::imageFormat().
QBitmap::QBitmap ( const QBitmap & bitmap )
Constructs a bitmap which is a copy of bitmap.
QBitmap::QBitmap ( int w, int h, bool clear = FALSE,
QPixmap::Optimization optimization = QPixmap::DefaultOptim
)
Constructs a bitmap with w width and h height.
The contents of the bitmap is uninitialized if clear is
FALSE, otherwise it is filled with pixel value 0 (the
QColor Qt::color0).
The optional optimization argument specifies the
optimization setting for the bitmap. The default
optimization should be used in most cases. Games and other
pixmap-intensive applications may benefit from setting
this argument.
See also QPixmap::setOptimization() and
QPixmap::setDefaultOptimization().
QBitmap::QBitmap ( int w, int h, const uchar * bits, bool
isXbitmap=FALSE )
Constructs a bitmap with w width and h height and sets the
contents to bits.
The isXbitmap should be TRUE if bits was generated by the
X11 bitmap program. The X bitmap bit order is little
endian. The QImage documentation discusses bit order of
monochrome images.
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QBitmap(3qt)QBitmap(3qt)
Example (creates an arrow bitmap):
uchar arrow_bits[] = { 0x3f, 0x1f, 0x0f, 0x1f, 0x3b, 0x71, 0xe0, 0xc0 };
QBitmap bm( 8, 8, arrow_bits, TRUE );
QBitmap::QBitmap ( const QSize & size, bool clear = FALSE,
QPixmap::Optimization optimization = QPixmap::DefaultOptim
)
This is an overloaded member function, provided for
convenience. It differs from the above function only in
what argument(s) it accepts.
QBitmap::QBitmap ( const QSize & size, const uchar * bits, bool
isXbitmap=FALSE )
This is an overloaded member function, provided for
convenience. It differs from the above function only in
what argument(s) it accepts.
QBitmap & QBitmap::operator= ( const QImage & image )
Converts the image image to a bitmap and assigns the
result to this bitmap. Returns a reference to the bitmap.
Dithering will be performed if the image has a
QImage::depth() greater than 1.
QBitmap & QBitmap::operator= ( const QPixmap & pixmap )
Assigns the pixmap pixmap to this bitmap and returns a
reference to this bitmap.
Dithering will be performed if the pixmap has a
QPixmap::depth() greater than 1.
QBitmap & QBitmap::operator= ( const QBitmap & bitmap )
Assigns the bitmap bitmap to this bitmap and returns a
reference to this bitmap.
QBitmap QBitmap::xForm ( const QWMatrix & matrix ) const
Returns a transformed copy of this bitmap, using matrix.
This function does exactly the same as QPixmap::xForm(),
except that it returns a QBitmap instead of a QPixmap.
See also QPixmap::xForm().
SEE ALSO
http://doc.trolltech.com/qbitmap.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
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QBitmap(3qt)QBitmap(3qt)AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports
make our job much simpler. Thank you.
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Please include the name of the manual page (qbitmap.3qt)
and the Qt version (2.3.1).
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