[Bug 77436] KDE Konsole very slow scrolling with TearFree and QT graphics system native

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77436

--- Comment #167 from Chris Wilson <chris at chris-wilson.co.uk> ---
I can't see anything else to squeeze out of masked glyphs. It basically
requires 3 passes: (1) clear temporary mask, (2) render glyphs to mask, (3)
composite mask onto dst.

That of course doesn't help your situation where konsole is able to queue up
rendering faster than can be processed by the GPU. So I tweaked the cheat:


commit a6ba93283b20a50ff36758624d2967562b7bdae9
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jun 27 13:42:37 2014 +0100

    sna/glyphs: Add DBG option for glyph tolerance

    And bump it to 3 so that glyph filtering doesn't force us to use the
    mask too often.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=77436
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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