[Libreoffice-bugs] [Bug 114012] High CPU usage when deleting some text with backspace

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=114012

--- Comment #1 from Telesto <telesto at surfxs.nl> ---
Created attachment 137946
  --> https://bugs.documentfoundation.org/attachment.cgi?id=137946&action=edit
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author  Miklos Vajna <vmiklos at collabora.co.uk>  2015-08-07 14:35:11 (GMT)
committer       Miklos Vajna <vmiklos at collabora.co.uk>  2015-08-07 14:35:23
(GMT)
commit  c64a7ce1fcd1e30956a77530d0b76ad493841024 (patch)
tree    723796de700b511614ffeb9c36b12284fa5d3255
parent  a6c7a0bf105c399d087e2d9f843dbd9b175fdf42 (diff)
Resolves: tdf#92982 vcl rendercontext: handle buffered paint of vcl::Cursor
Instead of painting on the vcl::Window directly, take a
PaintBufferGuard, and use the vcl::RenderContext of it, that may be
either the vcl::Window or the toplevel frame's buffer.

Trigger the paint of the buffer by informing the guard what area was
painted. In case of direct painting, both the ctor and the dtor of the
guard is a NOP.

This means that finally we can also assert Invert() calls on the output
device, so that direct paint can't happen when double-buffering.

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