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-.TH "qvfb" "1" "3.0.3" "Troll Tech AS, Norway." ""
-.SH "NAME"
-.LP
-qvfb \- Virtual framebuffer for Qt
-.SH "DESCRIPTION"
-.LP
-The virtual framebuffer allows Qt/Embedded programs to be
-developed on your desktop machine, without switching
-between consoles and X11.
-
-Start a Qt/Embedded master application (i.e., construct
-QApplication with QApplication::GuiServer flag or use the
-\-qws command line parameter). You will need to specify to
-the server that you wish to use the virtual framebuffer
-driver, e.g.:
-
- widgets \-qws \-display QVFb:0
-
-You may prefer to set the QWS_DISPLAY environment
-variable to be QVFb:0.
-
-qvfb supports the following command line options:
-
- \-width width: the width of the virtual framebuffer
- (default: 240).
- \-height height: the height of the virtual framebuffer
- (default: 320).
- \-depth depth: the depth of the virtual framebuffer (1, 8
- or 32; default: 8).
- \-nocursor: do not display the X11 cursor in the
- framebuffer window.
- \-qwsdisplay :id the Qt/Embedded display id to provide
- (default: 0).
-
- Virtual Framebuffer Design
-
-The virtual framebuffer emulates a framebuffer using a
-shared memory region (the virtual frame buffer) and a
-utility to display the framebuffer in a window (qvfb).
-The regions of the display that have changed are updated
-periodically, so you will see discrete snapshots of the
-framebuffer rather than each individual drawing
-operation. For this reason drawing problems such as
-flickering may not be apparent until the program is run
-using a real framebuffer.
-
-The target refresh rate can be set via the "View|Refresh
-Rate" menu item. This will cause qvfb to check for
-updated regions more tquickly. The rate is a target only.
-If little drawing is being done, the framebuffer will not
-show any updates between drawing events. If an
-application is displaying an animation the updates will
-be frequent, and the application and qvfb will compete
-for processor time.
-
-Mouse and keyboard events are passed to the Qt/Embedded
-master process via named pipes.
-
-The virtual framebuffer is a development tool only. No
-security issues have been considered in the virtual
-framebuffer design. It should be avoided in a production
-environment; QT_NO_QWS_VFB should always be defined in
-production libraries.
-.SH "AUTHORS"
-.LP
-TrollTech <http://www.trolltech.com/>