direct2d: Optimize dashed line drawing

This introduces a combined brush/dash pattern which can be used to
perform faster dashed straight-line drawing. The dash pattern is
prerendered to a tiled bitmap brush, resulting in a significant speedup
for lines with many elements.

As the result of non-rectilinear lines may lose quality compared to the
native dashed renderer, the slow/high quality codepath can be activated
by setting the QPainter::HighQualityAntialiasing render hint.

Task-number: QTBUG-40604
Change-Id: I771e9a81c042b4d8b6891dc9280932696e5a0694
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Louai Al-Khanji <louai.al-khanji@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

0 files changed, 0 insertions, 0 deletions