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Bug 976035: Cap max fling velocity at pref'd limit. r=kats

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This commit is contained in:
Ben Kelly 2014-02-24 16:08:31 -05:00
parent 0b86e5b513
commit a9244e29c6
1 changed files with 10 additions and 0 deletions
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10
gfx/layers/ipc/Axis.cpp
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@ -47,12 +47,19 @@ static float gFlingStoppedThreshold = 0.01f;
*/
static uint32_t gMaxVelocityQueueSize = 5;
/**
* Maximum velocity in pixels per millisecond. Velocity will be capped at this
* value if a faster fling occurs. Negative values indicate unlimited velocity.
*/
static float gMaxVelocity = -1.0f;
static void ReadAxisPrefs()
{
Preferences::AddFloatVarCache(&gMaxEventAcceleration, "apz.max_event_acceleration", gMaxEventAcceleration);
Preferences::AddFloatVarCache(&gFlingFriction, "apz.fling_friction", gFlingFriction);
Preferences::AddFloatVarCache(&gFlingStoppedThreshold, "apz.fling_stopped_threshold", gFlingStoppedThreshold);
Preferences::AddUintVarCache(&gMaxVelocityQueueSize, "apz.max_velocity_queue_size", gMaxVelocityQueueSize);
Preferences::AddFloatVarCache(&gMaxVelocity, "apz.max_velocity_pixels_per_ms", gMaxVelocity);
}
class ReadAxisPref MOZ_FINAL : public nsRunnable {
@ -90,6 +97,9 @@ Axis::Axis(AsyncPanZoomController* aAsyncPanZoomController)
void Axis::UpdateWithTouchAtDevicePoint(int32_t aPos, const TimeDuration& aTimeDelta) {
float newVelocity = mAxisLocked ? 0 : (mPos - aPos) / aTimeDelta.ToMilliseconds();
if (gMaxVelocity > 0.0f) {
newVelocity = std::min(newVelocity, gMaxVelocity);
}
mVelocity = newVelocity;
mPos = aPos;