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Remove the intermediate pixmap in the backing store and draw directly to
the window swap chain. This is faster and reduces memory pressure on the
graphics card.
In case of native child widgets we need to read back the back buffer,
which incurs an extra copy in this case.
In an artificial benchmark drawing animated full screen
gradients as fast as possible this patch increases performance by 42% on
my current machine from 480fps to around 680fps, i.e. the time for
actually getting the pixels to the screen is now lower.
Change-Id: Ifbeda0e199afec03cecfe76337679a9e9d082bdd
Reviewed-by: Risto Avila <risto.avila@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
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By only starting/ending drawing once in the backing store, we can avoid
multiple start/ends and thus flushes of the direct2d device context. This
can potentially be much faster with some drivers when many widgets that
draw to the same backing store need to redraw. Because starts/ends of
QWindowsDirect2DDeviceContext are already refcounted this works out of the
box.
Change-Id: Ib48edceef6a1041ae0509587c77ac0caa8b29fc6
Reviewed-by: Risto Avila <risto.avila@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
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Add a per-window swap chain to a QPlatformWindow subclass instead of tying
it to the backing store. This is needed to support native widgets (as
opposed to alien widgets).
Change the backing store to draw to an intermediate pixmap and flush to
the requested window by using the per-window swap chain. This also opens
the door for faster window presentation later on by using the swap chain
more intelligently.
Also add a changelog entry for the direct2d plugin, which was omitted
earlier.
[ChangeLog][QtGui][Windows]
Introduce experimental direct2d platform plugin for Windows. This plugin
shares most code with the current windows plugin, but substitutes a
direct2d-based paint engine for window backing stores and pixmaps.
Change-Id: I5f54e7e4c1fb15b1639bd26b712fb40ac141e4ac
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
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This is an alternative plugin for the windows platform. It shares most
code with the current windows plugin, but substitutes a direct2d-based
paint engine for window backing stores and pixmaps.
Change-Id: I78fafd9c5871fa090b49436f5b40ec80f8789f8b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
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