track dirty areas for Skia drawing

Updates to the screen in raster mode aren't _that_ slow, in fact
it seems using SkRegion can make things slower because of manipulating
the region, but with SkIRect this could sometimes help a bit.
It also appears that StretchDIBits() that is used by the Windows
raster code doesn't work correctly if only a subset of the y-axis
range is specified, which reduces the usefulness.

Change-Id: Ia93d2b60f2c62461e4c2c81210ab1d5d652a2cfb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104047
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

0 files changed, 0 insertions, 0 deletions