NAME
display-tile - Divide display into tiles similar to a video wall
SYNOPSIS
display-tile : [ [-usedb] | [-nodb] ]
<offset-x>,<offset-y>,<size-x>,<size-y>,<child-target-spec>
...
DESCRIPTION
Emulates one big target, where one or more areas are mapped to
different child visuals.
OPTIONS
For each tile (i.e. child visual or mapped area), the following must be
specified:
offset-x, offset-y
coordinates (within the parent visual) of the top-left corner of
the child visual
size-x, size-y
width and height of the child visual
:p‘child-target-spec‘
a target spec. Since target specs can (and often do) contain
colons, it needs to be enclosed in parentheses.
The following options apply to the whole display-tile:
-usedb Enables DirectBuffer emulation. This is the default mode.
The contents of each mapped area is blitted from the
DirectBuffer into their respective child visuals at regular
intervals or when the visual is flushed. DirectBuffer emulation
works regardless of whether the child visuals support
DirectBuffer or not.
-nodb Disables DirectBuffer emulation. LibGGI primitives are passed
to each of the child visuals with the necessary clipping and
translation. Thus, if a child visual underlying a mapped area
supports acceleration, then the operation on that area will be
accelerated.
FEATURES
· DirectBuffer support depends on the -usedb and -nodb options.
· Accelerated in no-DB mode if the underlying target is, otherwise
unaccelerated.
Tip: display-tile can be used to emulate DirectBuffer for
obstinate applications that cannot run without it, by specifying
one tile which maps the whole screen.