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graphics:  nx_openwindow() and nxtk_openwindow() now accept an addtional 'flag' parameter.  This argument is not used at present but will, eventually enable a RAM backed, per-window framebuffer.

    graphics/Kconfig:  Add configuration to support a rambacked framebuffer. Current marked as EXPERIMENTAL because this is a work in progress.
This commit is contained in:
Gregory Nutt
2019-03-13 12:34:13 -06:00
parent 0454ae2a10
commit 8a46b1f488
13 changed files with 128 additions and 112 deletions
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Documentation/NXGraphicsSubsystem.html
+25 -4
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@@ -12,7 +12,7 @@
<h1><big><font color="#3c34ec">
<i>NX Graphics Subsystem</i>
</font></big></h1>
<p>Last Updated: March 10, 2019</p>
<p>Last Updated: March 13, 2019</p>
</td>
</tr>
</table>
@@ -1348,7 +1348,7 @@ int nx_eventnotify(NXHANDLE handle, int signo);
#include &lt;nuttx/nx/nxglib.h&gt;
#include &lt;nuttx/nx/nx.h&gt;
NXWINDOW nx_openwindow(NXHANDLE handle,
NXWINDOW nx_openwindow(NXHANDLE handle, uint8_t flags,
FAR const struct nx_callback_s *cb,
FAR void *arg);
</pre></ul>
@@ -1360,6 +1360,10 @@ NXWINDOW nx_openwindow(NXHANDLE handle,
<ul><dl>
<dt><code>handle</code>
<dd>The handle returned by <a href="#nxconnectinstance"><code>nx_connect()</code></a>.
<dt><code>flags</code>
<dd>Optional flags.
Must be zero unless <code>CONFIG_NX_RAMBACKED</code> is enabled.
In that case, it may be zero or <code>NXBE_WINDOW_RAMBACKED</code>.
<dt><code>cb</code>
<dd>Callbacks used to process window events
<dt><code>arg</code>
@@ -2073,7 +2077,7 @@ typedef FAR void *NXTKWINDOW;
#include &lt;nuttx/nx/nx.h&gt;
#include &lt;nuttx/nx/nxtk.h&gt;
NXTKWINDOW nxtk_openwindow(NXHANDLE handle,
NXTKWINDOW nxtk_openwindow(NXHANDLE handle, uint8_t flags,
FAR const struct nx_callback_s *cb,
FAR void *arg);
</pre></ul>
@@ -2085,6 +2089,10 @@ NXTKWINDOW nxtk_openwindow(NXHANDLE handle,
<dl>
<dt><code>handle</code>
<dd>The handle returned by <a href="#nxconnectinstance"><code>nx_connect()</code></a>.
<dt><code>flags</code>
<dd>Optional flags.
Must be zero unless <code>CONFIG_NX_RAMBACKED</code> is enabled.
In that case, it may be zero or <code>NXBE_WINDOW_RAMBACKED</code>.
<dt><code>cb</code>
<dd>Callbacks used to process window events
<dt><code>arg</code>
@@ -3243,7 +3251,20 @@ int nxf_convert_32bpp(FAR uint32_t *dest, uint16_t height,
<ul>
<dl>
<dt><code>CONFIG_NX</code>
Enables overall support for graphics library and NX
<dd>Enables overall support for graphics library and NX
<dt><code>CONFIG_NX_RAMBACKED</code>
<dd>Enables RAM backed window support.
If this option is selected, then windows may be optionally created with a RAM frambuffer backing up the window content.
Rending into the window will result in rending into the backup framebuffer, then updating the physical display from the framebuffer.
<p>
The advantage of this option is that the application that manages window will no longer receive redraw() callbacks.
Those calls normally occur, for example, when a window "above" moves exposing a portion of the window below.
If this option is selected, then the system will redraw the exposed portion of the window from the backup framebuffer without intervention of the window applications.
This greatly reduces the complexity of the application and performance of the window at the expense of increased memory usage.
</p>
<p>
Redraw requests in other cases are also suppressed: Changes to window position, size, etc.
</p>
</dl>
</ul>