README
^^^^^^
This directory contains tiny graphics support for NuttX. The contents of this directory
are only build if CONFIG_NXGRAPHICS is defined in the NuttX configuration file.
Roadmap
^^^^^^^
This directory holds NuttX graphic packages. Not all of these packages are implemented
at the present, but here is the longer term roadmap:
NXWIDGETS - I had originally planned a high level, C++, object-oriented library for
object-oriented access to graphics widgets. However, because C++ compilers
are not available for some of the targets supported by NuttX, I have
decided to implement the entire solution in C -- that makes the solution
much uglier, but works fine on all platforms.
NXTOOLKIT - A set of C graphics tools that provide higher-level window drawing
operations. The toolkit can be used for window-oriented graphics
without NXWIDGETS and is built on top of NX.
NX - The tiny NuttX windowing system. This includes both a small-footprint,
single user implementaton (NXSU as described below) and a somewhat
larger multi-user implentation (NXMU as described below). Both
conform to the same APIs as defined in include/nuttx/nx.h and, hence,
are more-or-less interchangable. NX can be used without NXWIDGETS
and without NXTOOLKIT for raw access to window memory.
NXGLIB - Low level graphics utilities and direct framebuffer rendering logic.
NX is build on NXGLIB.
Related Header Files
^^^^^^^^^^^^^^^^^^^^
include/nuttx/nxglib.h -- Describes the NXGLIB C interfaces
include/nuttx/nx.h -- Describes the NX C interfaces
include/nutt/nxtk.h -- Describe the NXTOOLKIT C interfaces
include/nuttx/nxwidgets.h -- Will describe the NXWIDGETS classes (no longer planned)
Directories:
^^^^^^^^^^^^
graphics/nxglib
The NuttX tiny graphics library. The directory contains generic utilities
support operations on primitive graphics objects and logic to rasterize directly
into a framebuffer. It has no concept of windows (other than the one, framebuffer
window).
graphics/nxbe
This is the "back-end" of a tiny windowing system. It can be used with either of
two front-ends to complete a windowing system (see nxmu and nxsu below). It
contains most of the important window management logic: clipping, window controls,
window drawing, etc.
graphics/nxsu
This is the NX single user "front end". When combined with the generic "back-end"
(nxbe), it implements a single thread, single user windowing system. The files
in this directory present the window APIs described in include/nuttx/nx.h. The
single user front-end is selected when CONFIG_NX_MULTIUSER is not defined in the
NuttX configuration file.
graphics/nxsu
This is the NX multi user "front end". When combined with the generic "back-end"
(nxbe), it implements a multi-threaded, multi-user windowing system. The files
in this directory present the window APIs described in include/nuttx/nx.h. The
multi-user front end includes a graphics server that executes on its own thread;
multiple graphics clients then communicate with the server via a POSIX message
queue to serialize window operations from many threads. The multi-user front-end
is selected when CONFIG_NX_MULTIUSER is defined in the NuttX configuration file.
graphics/nxtoolkit
This is where the NXTOOLKIT implementation resides. This toolkit is built on
top of NX and works with either the single-user or multi-user NX version. See
include/nuttx/nxtk.h
graphics/nxwidgets
At one time, I planned to put NXWIDGETS implementation here, but not anymore.
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