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Move the NX components out of libc and into its own library, libnx

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Gregory Nutt
2013-12-28 08:40:03 -06:00
parent 0b0d1b3f59
commit 54046a0775
2 changed files with 21 additions and 3 deletions
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Documentation/NXGraphicsSubsystem.html
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@@ -12,7 +12,7 @@
<h1><big><font color="#3c34ec">
<i>NX Graphics Subsystem</i>
</font></big></h1>
<p>Last Updated: May 7, 2012</p>
<p>Last Updated: December 28, 2013</p>
</td>
</tr>
</table>
@@ -3144,9 +3144,20 @@ int nxf_convert_32bpp(FAR uint32_t *dest, uint16_t height,
</tr>
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<p>
The graphics capability consist both of components internal to the RTOS and of user-callable interfaces.
In the NuttX kernel mode build there are some components of the graphics subsystem are callable in user mode and other components that are internal to the RTOS.
The directory <code>nuttx/graphics</code> contains only those components that are internal to the RTOS.
User callable functions must be part of a library that can be linked against user applications.
This user callable interfaces are provided in sub-directories under <code>nuttx/libnx</code>.
<p>
<ul>
<dl>
<dt><code>graphics/nxglib</code>
<dt><code>libnx/nx</code>
<dd>Common callable interfaces that are, logically, part of both nxmu and nxsu.
<dt><code>graphics/nxglib</code> and <code>libnx/nxglib</code>
<dd>The NuttX tiny graphics library.
The directory contains generic utilities support operations on primitive graphics objects
and logic to rasterize directly into a framebuffer or through an LCD driver interface.
@@ -3168,7 +3179,12 @@ int nxf_convert_32bpp(FAR uint32_t *dest, uint16_t height,
The single user front-end is selected when <code>CONFIG_NX_MULTIUSER</code> is not
defined in the NuttX configuration file.
<dt><code>graphics/nxsu</code>
<blockquote>
NOTE: There is no nxsu sub-directory in nuttx/libnx.
That is because this separation of interfaces is only required in the kernel build mode and only the multi-user interfaces can be used with the kernel build.
</blockquote>
<dt><code>graphics/nxmu</code> and <code>libnx/nxmu</code>
<dd>This is the NX multi user <i>front end</i>.
When combined with the generic <i>back-end</i> (<code>nxbe</code>), it implements a
multi-threaded, multi-user windowing system.