You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
160 lines
7.8 KiB
160 lines
7.8 KiB
13 years ago
|
'\" t
|
||
|
|
.TH QBitmap 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
|
||
|
|
.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
|
||
|
|
.\" license file included in the distribution for a complete license
|
||
|
|
.\" statement.
|
||
|
|
.\"
|
||
|
|
.ad l
|
||
|
|
.nh
|
||
|
|
.SH NAME
|
||
|
|
QBitmap \- Monochrome (1-bit depth) pixmaps
|
||
|
|
.SH SYNOPSIS
|
||
|
|
\fC#include <qbitmap.h>\fR
|
||
|
|
.PP
|
||
|
|
Inherits QPixmap.
|
||
|
|
.PP
|
||
|
|
.SS "Public Members"
|
||
|
|
.in +1c
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ()"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( int w, int h, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( const QSize & size, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( int w, int h, const uchar * bits, bool isXbitmap = FALSE )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( const QSize & size, const uchar * bits, bool isXbitmap = FALSE )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( const QBitmap & bitmap )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "\fBQBitmap\fR ( const QString & fileName, const char * format = 0 )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "QBitmap & \fBoperator=\fR ( const QBitmap & bitmap )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "QBitmap & \fBoperator=\fR ( const QPixmap & pixmap )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "QBitmap & \fBoperator=\fR ( const QImage & image )"
|
||
|
|
.br
|
||
|
|
.ti -1c
|
||
|
|
.BI "QBitmap \fBxForm\fR ( const QWMatrix & matrix ) const"
|
||
|
|
.br
|
||
|
|
.in -1c
|
||
|
|
.SH DESCRIPTION
|
||
|
|
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().
|
||
|
|
.SH "QBitmap::QBitmap ( const QSize & size, bool clear = FALSE, QPixmap::Optimization optimization = QPixmap::DefaultOptim )"
|
||
|
|
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.
|
||
|
|
.PP
|
||
|
|
Example (creates an arrow bitmap):
|
||
|
|
.PP
|
||
|
|
.nf
|
||
|
|
.br
|
||
|
|
uchar arrow_bits[] = { 0x3f, 0x1f, 0x0f, 0x1f, 0x3b, 0x71, 0xe0, 0xc0 };
|
||
|
|
.br
|
||
|
|
QBitmap bm( 8, 8, arrow_bits, TRUE );
|
||
|
|
.br
|
||
|
|
.fi
|
||
|
|
.SH "QBitmap::QBitmap ( const QSize & size, const uchar * bits, bool isXbitmap = FALSE )"
|
||
|
|
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.
|
||
|
|
.SH "QBitmap::QBitmap ( const QString & fileName, const char * format = 0 )"
|
||
|
|
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().
|
||
|
|
.SH "QBitmap & QBitmap::operator= ( const QBitmap & bitmap )"
|
||
|
|
Assigns the bitmap \fIbitmap\fR to this bitmap and returns a reference to this bitmap.
|
||
|
|
.SH "QBitmap & QBitmap::operator= ( const QPixmap & pixmap )"
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
.PP
|
||
|
|
Assigns the pixmap \fIpixmap\fR to this bitmap and returns a reference to this bitmap.
|
||
|
|
.PP
|
||
|
|
Dithering will be performed if the pixmap has a QPixmap::depth() greater than 1.
|
||
|
|
.SH "QBitmap & QBitmap::operator= ( const QImage & image )"
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
.PP
|
||
|
|
Converts the image \fIimage\fR to a bitmap and assigns the result to this bitmap. Returns a reference to the bitmap.
|
||
|
|
.PP
|
||
|
|
Dithering will be performed if the image has a QImage::depth() greater than 1.
|
||
|
|
.SH "QBitmap QBitmap::xForm ( const QWMatrix & matrix ) const"
|
||
|
|
Returns a transformed copy of this bitmap by using \fImatrix\fR.
|
||
|
|
.PP
|
||
|
|
This function does exactly the same as QPixmap::xForm(), except that it returns a QBitmap instead of a QPixmap.
|
||
|
|
.PP
|
||
|
|
See also QPixmap::xForm().
|
||
|
|
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.BR http://doc.trolltech.com/qbitmap.html
|
||
|
|
.BR http://www.trolltech.com/faq/tech.html
|
||
|
|
.SH COPYRIGHT
|
||
|
|
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
|
||
|
|
license file included in the distribution for a complete license
|
||
|
|
statement.
|
||
|
|
.SH AUTHOR
|
||
|
|
Generated automatically from the source code.
|
||
|
|
.SH BUGS
|
||
|
|
If you find a bug in Qt, please report it as described in
|
||
|
|
.BR http://doc.trolltech.com/bughowto.html .
|
||
|
|
Good bug reports help us to help you. Thank you.
|
||
|
|
.P
|
||
|
|
The definitive Qt documentation is provided in HTML format; it is
|
||
|
|
located at $QTDIR/doc/html and can be read using Qt Assistant or with
|
||
|
|
a web browser. This man page is provided as a convenience for those
|
||
|
|
users who prefer man pages, although this format is not officially
|
||
|
|
supported by Trolltech.
|
||
|
|
.P
|
||
|
|
If you find errors in this manual page, please report them to
|
||
|
|
.BR qt-bugs@trolltech.com .
|
||
|
|
Please include the name of the manual page (qbitmap.3qt) and the Qt
|
||
|
|
version (3.3.8).
|