[Webkit-unassigned] [Bug 184879] New: [GTK][WPE] Upload Tile buffers to textures as soon as they are rendered instead of waiting for all the buffers to be rendered

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184879

            Bug ID: 184879
           Summary: [GTK][WPE] Upload Tile buffers to textures as soon as
                    they are rendered instead of waiting for all the
                    buffers to be rendered
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: magomez at igalia.com
                CC: bugs-noreply at webkitgtk.org

Currently all the tile buffers are rendered with cairo and, only after of them are rendered, they are uploaded to textures in the compositor thread. This causes that we have to wait for the upload of all the buffers before performing the composition, which can be a bottleneck. With this patch, the buffers are uploaded as soon as they are rendered, which means that when we want to perform the composition all the textures will be ready. The advantage of this is that we release the buffer memory faster, which will reduce the memory consumption during rendering, and we don't have to wait for the buffer upload before compositing, as we upload the buffers on idle cycles of the compositor thread. The disadvantage is that we increase the usage of video memory, because instead of having a texture front buffer and a normal buffer as the back buffer, we now have 2 textures as the front and back buffers of the tiles.

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