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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Color buffer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93094">93094</a>
</td>
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<th>Summary</th>
<td>Color buffer
</td>
</tr>
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<th>Product</th>
<td>Wayland
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>wayland
</td>
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<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>phizhed@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Create a simple X application, fill color to empty window, then change the
window size - the color is redrawn. Chaotic drive the cursor and see the CPU
load. The same situation with empty windows when using toolkits - frequent
redrawing.
I propose to create a wayland protocol extension, which you can get the colored
wl_buffer desired size and then work with him as with the original wl_buffer.
The compositor is anyway responsible for the rendering of client buffers and
nothing prevents to fill a buffer the color chosen by the client.
So, we have 5 full-screen clients who want to fill their surfaces is black
color. Assume that the screen resolution 1920x1080, format argb8888. Each
client will create a shared memory file is size 1920*1080*4 = 8294400 B ~= 8
MB. Because clients 5, the total cost 35 MB of memory.
However, using this protocol extension would expend a total memory of 8 MB. In
addition, the compositor can fill the buffer using a variety of optimizations -
the scope for compositor developers.</pre>
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</p>
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