tdf#153306 prevent subpixel shifting of X coordinate HEADmaster

HACK: for some unknown reason, if the X coordinate of the
path's bounds is more than 1024, SkBlendMode::kExclusion will
shift by about a half a pixel to the right with Skia/Metal on
a Retina display. Weirdly, if the same polygon is repeatedly
drawn, the total shift is cumulative so if the drawn polygon
is more than a few pixels wide, the blinking cursor in Writer
will exhibit this bug but only for one thin vertical slice at
a time. Apparently, shifting drawing a very tiny amount to
the left seems to be enough to quell this runaway cumulative
X coordinate shift.

Change-Id: Ic1ac8a390df51c4aa1cc3183590dce72059af6b6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166766
Reviewed-by: Patrick Luby <guibomacdev@gmail.com>
Tested-by: Jenkins

0 files changed, 0 insertions, 0 deletions