The QBitmap class provides monochrome (1-bit depth) pixmaps.
.PP
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.
.PP
A QBitmap is a QPixmap with a depth of 1. If a pixmap with a depth greater than 1 is assigned to a bitmap, the bitmap will be dithered automatically. A QBitmap is guaranteed to always have the depth 1, unless it is QPixmap::isNull() which has depth 0.
.PP
When drawing in a QBitmap (or QPixmap with depth 1), we recommend using the QColor objects \fCQt::color0\fR and \fCQt::color1\fR. Painting with \fCcolor0\fR sets the bitmap bits to 0, and painting with \fCcolor1\fR sets the bits to 1. For a bitmap, 0-bits indicate background (or transparent) and 1-bits indicate foreground (or opaque). Using the \fCblack\fR and \fCwhite\fR QColor objects make no sense because the QColor::pixel() value is not necessarily 0 for black and 1 for white.
.PP
The QBitmap can be transformed (translated, scaled, sheared or rotated) using xForm().
.PP
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.
.PP
See also QPixmap, QPainter::drawPixmap(), bitBlt(), Shared Classes, Graphics Classes, Image Processing Classes, and Implicitly and Explicitly Shared Classes.
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QBitmap::QBitmap ()"
Constructs a null bitmap.
.PP
See also QPixmap::isNull().
.SH "QBitmap::QBitmap ( int w, int h, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )"
Constructs a bitmap with width \fIw\fR and height \fIh\fR.
.PP
The contents of the bitmap is uninitialized if \fIclear\fR is FALSE; otherwise it is filled with pixel value 0 (the QColor \fCQt::color0\fR).
.PP
The optional \fIoptimization\fR 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 QPixmap::Optimization.
.PP
See also QPixmap::setOptimization() and QPixmap::setDefaultOptimization().
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
Constructs a bitmap with the size \fIsize\fR.
.PP
The contents of the bitmap is uninitialized if \fIclear\fR is FALSE; otherwise it is filled with pixel value 0 (the QColor \fCQt::color0\fR).
.PP
The optional \fIoptimization\fR 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 QPixmap::Optimization.
.SH "QBitmap::QBitmap ( int w, int h, const uchar * bits, bool isXbitmap = FALSE )"
Constructs a bitmap with width \fIw\fR and height \fIh\fR and sets the contents to \fIbits\fR.
.PP
The \fIisXbitmap\fR flag should be TRUE if \fIbits\fR was generated by the X11 bitmap program. The X bitmap bit order is little endian. The QImage documentation discusses bit order of monochrome images.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
Constructs a bitmap with the size \fIsize\fR and sets the contents to \fIbits\fR.
.PP
The \fIisXbitmap\fR flag should be TRUE if \fIbits\fR was generated by the X11 bitmap program. The X bitmap bit order is little endian. The QImage documentation discusses bit order of monochrome images.
.SH "QBitmap::QBitmap ( const QBitmap & bitmap )"
Constructs a bitmap that is a copy of \fIbitmap\fR.
Constructs a bitmap from the file \fIfileName\fR. If the file does not exist or is of an unknown format, the bitmap becomes a null bitmap.
.PP
The parameters \fIfileName\fR and \fIformat\fR are passed on to QPixmap::load(). Dithering will be performed if the file format uses more than 1 bit per pixel.
.PP
See also QPixmap::isNull(), QPixmap::load(), QPixmap::loadFromData(), QPixmap::save(), and QPixmap::imageFormat().
