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| <div class="section" id="frame-buffer-drivers"> |
| <h1>Frame Buffer Drivers<a class="headerlink" href="#frame-buffer-drivers" title="Permalink to this headline">ΒΆ</a></h1> |
| <ul> |
| <li><p><code class="docutils literal notranslate"><span class="pre">include/nuttx/video/fb.h</span></code>. All structures and APIs |
| needed to work with frame buffer drivers are provided in this |
| header file.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">fb_vtable_s</span></code>. Each frame buffer device driver |
| must implement an instance of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">fb_vtable_s</span></code>. That |
| structure defines a call table with the following methods:</p> |
| <p>Get information about the video controller configuration and |
| the configuration of each color plane.</p> |
| <p>The following are provided only if the video hardware supports |
| RGB color mapping:</p> |
| <p>The following are provided only if the video hardware supports |
| a hardware cursor:</p> |
| </li> |
| <li><p><strong>Binding Frame Buffer Drivers</strong>. Frame buffer drivers are not |
| normally directly accessed by user code, but are usually bound |
| to another, higher level device driver. In general, the binding |
| sequence is:</p> |
| <ol class="arabic simple"> |
| <li><p>Get an instance of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">fb_vtable_s</span></code> from the |
| hardware-specific frame buffer device driver, and</p></li> |
| <li><p>Provide that instance to the initialization method of the |
| higher level device driver.</p></li> |
| </ol> |
| </li> |
| <li><p><strong>Examples</strong>: <code class="docutils literal notranslate"><span class="pre">arch/sim/src/up_framebuffer.c</span></code>. See also the |
| usage of the frame buffer driver in the <code class="docutils literal notranslate"><span class="pre">graphics/</span></code> |
| directory.</p></li> |
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