Implement OpenVG buffer scrolling and enable it on Symbian.

Add support for accelerated scrolling in the "direct" window surface
implementation. Using vgCopyPixels(), the already rasterized content on
the surface can be shifted to a new location such that only a portion
of the suqsequent frame needs to be repainted instead of the entire
frame.

This only works when the "preserved" EGL swap behavior is enabled and
the impact on performance is highly dependant on the specific hardware
platform in use.

Task-number: QT-2972
Reviewed-by: Rhys Weatherley

0 files changed, 0 insertions, 0 deletions