[Wayland-bugs] [Bug 93094] Color buffer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93094

            Bug ID: 93094
           Summary: Color buffer
           Product: Wayland
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: wayland
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: phizhed at gmail.com

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.

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