** Changed in: oxide
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1552161
Title:
Using ui::TouchEvent makes scroll / pinch gestures coarse
Status in Oxide:
Fix Released
Bug description:
The lifetime of a touch event in Oxide before we pass it to Chromium
is:
QTouchEvent -> ui::TouchEvent -> ui::MotionEvent.
Touch co-ordinates are in device independent pixels, and Qt provides
these as floats. The constructor for ui::TouchEvent requires us to
round the co-ordinates to the nearest integer because it takes a
gfx::Point.
This causes a problem - it means that the smallest touch point
movement is 1 device-independent pixel, which could be 2 or 3 physical
pixels depending on the device scale. This makes scrolling and pinch-
zooming appear coarse compared to Chrome/Android (where it's possible
to scroll by single physical pixels).
As ui::MotionEvent works with floats, I suggest we just cut out the
middleman here and stop using ui::TouchEvent entirely.
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