directfbrc (5) - Linux Man Pages
directfbrc: DirectFB configuration file
directfbrc - DirectFB configuration file
The directfbrc file is a configuration file read by all DirectFB applications on startup. There are two of these: a system-wide one stored in /etc/directfbrc and a per-user $HOME/.directfbrc which may override system settings.
Further customization is available per executable (basename of argv): /etc/directfbrc.$0 and a per-user $HOME/.directfbrc.$0
After config files, the environment variable DFBARGS is parsed.
The same parameters that can be used in the directfbrc file can be passed via this variable or on the command-line by prefixing them with --dfb: separated each with a comma.
The directfbrc file contains one parameter per line. Comments are introduced by a hash sign (#), and continue until the end of the line. Blank lines are ignored.
Most parameters are switches that turn certain features on or off. These switches have a no- variant that disables the feature. This man-page describes the positive variant and will also note which setting is the compiled-in default.
The following parameters may be specified in the directfbrc file:
Specifies the graphics system to use. The default is to use the Linux
frame buffer (fbdev) but you can also run DirectFB applications on
SDL (sdl). Other systems might be added in the future.
Opens the given frame buffer device instead of /dev/fb0.
Specify the bus location of the card. The option is only used if DirectFB
doesn't have sysfs support and if unspecified 1:0:0 will be assumed.
Use this option if the driver fails to detect (or incorrectly detects) your card.
Sets the default screen resolution. If unspecified DirectFB will use
the first mode from
Some frame buffer devices (namely vesafb) don't support mode switches
and can only be used in the resolution that is set on boot time.
Scale the window to this size for 'force-windowed' apps.
Sets the default pixel depth in bits per pixel. If unspecified
DirectFB will use the depth specified in the first mode from
DirectFB supports color depths of 8, 15, 16, 24 and 32. Which values
are available depends on the frame buffer device you are using. Some
frame buffer devices (namely vesafb) don't support mode switches at
all and can only be used in the pixel depth that is set at boot time.
Sets the default pixel format. This is similar to the depth parameter
described above but allows more fine-grained control. Possible values
for pixelformat are LUT8, RGB332, RGB16, RGB24 and RGB32. Some drivers
may also support the more exotic pixel formats A8, ALUT44, ARGB, ARGB1555,
I420, UYVY, YUY2 and YV12.
Selects the multi application world which is joined or created.
Starting with zero, negative values force creation of a new
world using the lowest unused session number. This will override
the environment variable "DIRECTFB_SESSION".
Always enter as a slave, waiting for the master, if not there.
Select the remote session to connect to.
Uses the given directory (tmpfs mount point) for creation of the
shared memory file in multi application mode. This option is only
useful if the automatic detection fails or if non-tmpfs storage
Group that owns shared memory files.
With this option the probing of memcpy() routines can be skipped,
saving a lot of startup time. Pass "help" for a list of possible
Selects which layer is the "primary layer", default is the first.
Check 'dfbinfo' for a list of layers supported by your hardware.
Tell application only about the primary layer.
Suppresses console output from DirectFB. Only error messages will be
Enables the output of the DirectFB banner at startup. This is on by
Enables debug output. This is on by default but you won't see any
debug output unless you compiled DirectFB with debugging support.
Enable memory allocation tracking.
Enable shared memory allocation tracking.
Enable stack trace support. This is on by default but you won't see any
trcae output unless you compiled DirectFB with trace support.
Write all messages to the specified file.
Send all messages via UDP to the specified host and port.
Abort on NONE, ASSERT (default) or ASSUME (incl. assert)
Forces the primary surface to be a window. This allows to run
applications that were written to do full-screen access in a window.
Forces the primary surface to be the background surface of the desktop.
Turns hardware acceleration on. By default hardware acceleration is
auto-detected. If you disable hardware acceleration, the driver for
your graphics card will still be loaded and used to access additional
display layers (if there are any), but all graphics operations will
be performed by the software renderer.
This option allows to disable software fallbacks.
Turns DMA acceleration on, if supported by the driver. By default
DMA acceleration is off.
Flushes all disk buffers before initializing DirectFB. This can be
useful if you working with experimental device drivers and expect
crashes. The default is not to sync.
The no-mmx options allows to disable the use of MMX routines even if
support for MMX was detected. By default MMX is used if is available
and support for MMX was compiled in.
Turns AGP memory support on. The option enables DirectFB using the AGP
memory to extend the amount of video memory available. You can specify
the AGP mode to use (e.g. 1, 2, 4, 8 or 0 to disable agp). By default
AGP memory support is off.
Free sysmem instance on xfer to video memory.
Specify the font format to use. Possible values are A1, A8, ARGB, ARGB1555,
ARGB2554, ARGB4444, AiRGB. The default font format is A8 because it is the
only format that ensures high quality, fast rendering and low memory consumption
at the same time. Use this option only if your fonts looks strange or if
font rendering is too slow.
By default DirectFB installs a signal handler for a number of signals
that cause an application to exit. This signal handler tries to
deinitialize the DirectFB engine before quitting the application.
Use this option to enable/disable this feature.
As described with the
option, DirectFB installs a signal handler for a number of signals.
By using this option you may specify a list of signals that shouldn't
be handled this way.
By default DirectFB checks if the application has released all allocated
resources on exit. If it didn't, it will clean up after the application.
This option allows to switch this feature on or off.
This option activates blocking of all signals, useful for DirectFB daemons
(a DirectFB master application that does nothing except being the master).
By default DirectFB allocates a new virtual terminal and switches to
Use given VT instead of current/new one.
Allow to switch virtual terminals using <Ctrl>+<Alt>+<F?>. This is an
experimental feature that is usually disabled; use at your own risk.
Puts the virtual terminal into graphics mode. This has the advantage
that kernel messages won't show up on your screen while the DirectFB
application is running.
Use VT handling code at all?
Specify the serial mouse device.
Enables using GPM as mouse input repeater.
Usually DirectFB compresses mouse motion events. This means that
subsequent mouse motions are delivered to the application as a single
mouse motion event. This leads to a more responsive but less exact
Specifies the mouse protocol to use. The following
protocols are supported:
MS Two button mouse using the Microsoft mouse protocol.
MS3 Three button mouse using an extended Microsoft mouse protocol.
MouseMan Three button mouse using a different extension to the Microsoft mouse protocol introduced by Logitech.
MouseSystems The most commonly used protocol for three button mice.
PS/2 Two/three button mice of the PS/2 series.
IMPS/2 Two/three button USB mice with scrolling wheel using the Microsoft Intellimouse protocol.
The different protocols for serial mice are described in more detail in mouse(4).
Swaps left and right mouse buttons. Useful for left-handers.
Map the CapsLock key to Meta. Useful for users of the builtin WM
without a Meta key on the keyboard (e.g. Window key).
Ignore all non-IR Linux Input devices.
Grab Linux Input devices. When a device is grabbed only DirectFB
will receive events from it. The default is to not grab.
By default DirectFB shows a mouse cursor when an application makes use
of windows. This option allows to switch the cursor off permanently.
Applications cannot enable it explicitly.
Specify the window manager to use.
Completely disables background handling. Doesn't make much sense since
the mouse and moving windows will leave ugly traces on the background.
Controls the color of the background. The color is specified in
hexadecimal notation. The alpha value defaults to full opacity and may
be omitted. For example to choose a bright magenta background, you'd
Fills the background with the given image from file. The image is stretched
to fit to the screen dimensions.
but tiles the image to fit to the screen dimensions instead of
By default DirectFB windows may be translucent. If you disable this
feature, windows are forced to be either fully opaque or fully
transparent. This is useful if your graphics card doesn't support
Enables window decorations if supported by the window manager.
Limits the amount of Video RAM used by DirectFB. The amount of Video
RAM is specified in Kilobytes.
Limits the amount if AGP memory used by DirectFB. The amount of AGP
memory is specified in Kilobytes.
If specified DirectFB will dump the screen contents in PPM format
into this directory when the <Print> key gets pressed.
Suppress loading of this module. The module name is the filename
without the libdirectfb_ prefix and without extension (for
example keyboard to disable loading of the keyboard input
Some older Matrox G400 cards have SGRAM and a number of graphics
operations are considerably faster on these cards if this feature
is enabled. Don't try to enable it if your card doesn't have SGRAM!
Otherwise you'd have to reboot.
If you have a dual head G400/G450/G550 you can use this option to
enable additional layers using the second head.
Controls the signal produced by the TV output of Matrox cards.
Matrox cable type (default=composite).
Use this device for the H3600 TS driver.
Use this device for the MuTouch driver.
Use this device for the PenMount driver.
Use these devices for the Linux Input driver.
Use these devices for the tslib driver.
Override the hardware revision number used by the Unichrome driver.
Redirect videolayer to pixelpipe B.
Allows to control where window surfaces are stored. Supported values
for <policy> are:
auto DirectFB decides depending on hardware capabilities. This is the default.
videohigh Swapping system/video with high priority.
videolow Swapping system/video with low priority.
systemonly Window surfaces are stored in system memory.
videoonly Window surfaces are stored in video memory.
Allows to control the desktop buffer mode. Whenever a window is moved,
opened, closed, resized or its contents change DirectFB recomposites
the window stack at the affected region. This is done by blitting the
windows together that are visible within that region. Opaque windows
are blitted directly while translucent windows are blitted using alpha
blending or color keying. If there's a back buffer the recomposition is
not visible since only the final result is copied into the front
buffer. Without a back buffer each step of the recomposition is visible.
This causes noticeable flicker unless all windows are opaque.
Supported values for <mode> are:
auto DirectFB decides depending on hardware capabilities. This is the default. DirectFB chooses a back buffer in video memory if the hardware supports simple blitting (copying from back to front buffer). If there's no acceleration at all the back buffer is allocated in system memory since that gives much better performance for alpha blended recomposition in software and avoids reading from the video memory when the result is copied to the front buffer.
backsystem The back buffer is allocated in system memory. This is the recommend choice if your hardware supports simple blitting but no alpha blending and you are going to have many alpha blended windows.
backvideo Front and back buffer are allocated in video memory. It's not required to set this mode explicitly because the 'auto' mode chooses it if blits are accelerated. Without accelerated blits this mode is not recommended.
triple Like backvideo except the surface is triple buffered.
frontonly There is no back buffer. This is the best choice if you are using opaque windows only and don't use any color keying.
windows Special mode with window buffers directly displayed. This mode requires special hardware support.
Wait for the vertical retrace after flipping. The default is to wait
before doing the flip.
Disables polling for vertical retrace.
Here are some examples that demonstrates how the parameters described above are passed to DirectFB application on the command-line.
- df_neo --dfb:no-hardware
- Starts df_neo without hardware acceleration.
- df_neo --dfb:help
Lists the DirectFB options that can be passed to df_neo.
The canonical place to find informations about DirectFB is at http://www.directfb.org/. Here you can find the FAQ, tutorials, mailing list archives, the CVS tree and can download the latest version of the DirectFB library as well as a number of applications.
- system-wide DirectFB configuration file
- per-user DirectFB configuration file
frame buffer modes file