コード例 #1
0
float Axis::ApplyFlingCurveToVelocity(float aVelocity) const {
  float newVelocity = aVelocity;
  if (gfxPrefs::APZMaxVelocity() > 0.0f) {
    bool velocityIsNegative = (newVelocity < 0);
    newVelocity = fabs(newVelocity);

    float maxVelocity = ToLocalVelocity(gfxPrefs::APZMaxVelocity());
    newVelocity = std::min(newVelocity, maxVelocity);

    if (gfxPrefs::APZCurveThreshold() > 0.0f && gfxPrefs::APZCurveThreshold() < gfxPrefs::APZMaxVelocity()) {
      float curveThreshold = ToLocalVelocity(gfxPrefs::APZCurveThreshold());
      if (newVelocity > curveThreshold) {
        // here, 0 < curveThreshold < newVelocity <= maxVelocity, so we apply the curve
        float scale = maxVelocity - curveThreshold;
        float funcInput = (newVelocity - curveThreshold) / scale;
        float funcOutput =
          gVelocityCurveFunction->GetValue(funcInput,
            ComputedTimingFunction::BeforeFlag::Unset);
        float curvedVelocity = (funcOutput * scale) + curveThreshold;
        AXIS_LOG("%p|%s curving up velocity from %f to %f\n",
          mAsyncPanZoomController, Name(), newVelocity, curvedVelocity);
        newVelocity = curvedVelocity;
      }
    }

    if (velocityIsNegative) {
      newVelocity = -newVelocity;
    }
  }

  return newVelocity;
}
コード例 #2
0
ファイル: Axis.cpp プロジェクト: cbradley857/gecko-dev
void Axis::UpdateWithTouchAtDevicePoint(ParentLayerCoord aPos, ParentLayerCoord aAdditionalDelta, uint32_t aTimestampMs) {
  // mVelocityQueue is controller-thread only
  APZThreadUtils::AssertOnControllerThread();

  if (aTimestampMs <= mVelocitySampleTimeMs + MIN_VELOCITY_SAMPLE_TIME_MS) {
    // See also the comment on MIN_VELOCITY_SAMPLE_TIME_MS.
    // We still update mPos so that the positioning is correct (and we don't run
    // into problems like bug 1042734) but the velocity will remain where it was.
    // In particular we don't update either mVelocitySampleTimeMs or
    // mVelocitySamplePos so that eventually when we do get an event with the
    // required time delta we use the corresponding distance delta as well.
    AXIS_LOG("%p|%s skipping velocity computation for small time delta %dms\n",
        mAsyncPanZoomController, Name(), (aTimestampMs - mVelocitySampleTimeMs));
    mPos = aPos;
    return;
  }

  float newVelocity = mAxisLocked ? 0.0f : (float)(mVelocitySamplePos - aPos + aAdditionalDelta) / (float)(aTimestampMs - mVelocitySampleTimeMs);
  if (gfxPrefs::APZMaxVelocity() > 0.0f) {
    bool velocityIsNegative = (newVelocity < 0);
    newVelocity = fabs(newVelocity);

    float maxVelocity = ToLocalVelocity(gfxPrefs::APZMaxVelocity());
    newVelocity = std::min(newVelocity, maxVelocity);

    if (gfxPrefs::APZCurveThreshold() > 0.0f && gfxPrefs::APZCurveThreshold() < gfxPrefs::APZMaxVelocity()) {
      float curveThreshold = ToLocalVelocity(gfxPrefs::APZCurveThreshold());
      if (newVelocity > curveThreshold) {
        // here, 0 < curveThreshold < newVelocity <= maxVelocity, so we apply the curve
        float scale = maxVelocity - curveThreshold;
        float funcInput = (newVelocity - curveThreshold) / scale;
        float funcOutput = gVelocityCurveFunction->GetValue(funcInput);
        float curvedVelocity = (funcOutput * scale) + curveThreshold;
        AXIS_LOG("%p|%s curving up velocity from %f to %f\n",
          mAsyncPanZoomController, Name(), newVelocity, curvedVelocity);
        newVelocity = curvedVelocity;
      }
    }

    if (velocityIsNegative) {
      newVelocity = -newVelocity;
    }
  }

  AXIS_LOG("%p|%s updating velocity to %f with touch\n",
    mAsyncPanZoomController, Name(), newVelocity);
  mVelocity = newVelocity;
  mPos = aPos;
  mVelocitySampleTimeMs = aTimestampMs;
  mVelocitySamplePos = aPos;

  // Limit queue size pased on pref
  mVelocityQueue.AppendElement(std::make_pair(aTimestampMs, mVelocity));
  if (mVelocityQueue.Length() > gfxPrefs::APZMaxVelocityQueueSize()) {
    mVelocityQueue.RemoveElementAt(0);
  }
}
コード例 #3
0
ファイル: Axis.cpp プロジェクト: RobertJGabriel/Waterfox
void Axis::UpdateWithTouchAtDevicePoint(ParentLayerCoord aPos, uint32_t aTimestampMs) {
  // mVelocityQueue is controller-thread only
  APZThreadUtils::AssertOnControllerThread();

  if (aTimestampMs == mPosTimeMs) {
    // This could be a duplicate event, or it could be a legitimate event
    // on some platforms that generate events really fast. As a compromise
    // update mPos so we don't run into problems like bug 1042734, even though
    // that means the velocity will be stale. Better than doing a divide-by-zero.
    mPos = aPos;
    return;
  }

  float newVelocity = mAxisLocked ? 0.0f : (float)(mPos - aPos) / (float)(aTimestampMs - mPosTimeMs);
  if (gfxPrefs::APZMaxVelocity() > 0.0f) {
    bool velocityIsNegative = (newVelocity < 0);
    newVelocity = fabs(newVelocity);

    float maxVelocity = ToLocalVelocity(gfxPrefs::APZMaxVelocity());
    newVelocity = std::min(newVelocity, maxVelocity);

    if (gfxPrefs::APZCurveThreshold() > 0.0f && gfxPrefs::APZCurveThreshold() < gfxPrefs::APZMaxVelocity()) {
      float curveThreshold = ToLocalVelocity(gfxPrefs::APZCurveThreshold());
      if (newVelocity > curveThreshold) {
        // here, 0 < curveThreshold < newVelocity <= maxVelocity, so we apply the curve
        float scale = maxVelocity - curveThreshold;
        float funcInput = (newVelocity - curveThreshold) / scale;
        float funcOutput = gVelocityCurveFunction->GetValue(funcInput);
        float curvedVelocity = (funcOutput * scale) + curveThreshold;
        AXIS_LOG("%p|%s curving up velocity from %f to %f\n",
          mAsyncPanZoomController, Name(), newVelocity, curvedVelocity);
        newVelocity = curvedVelocity;
      }
    }

    if (velocityIsNegative) {
      newVelocity = -newVelocity;
    }
  }

  AXIS_LOG("%p|%s updating velocity to %f with touch\n",
    mAsyncPanZoomController, Name(), newVelocity);
  mVelocity = newVelocity;
  mPos = aPos;
  mPosTimeMs = aTimestampMs;

  // Limit queue size pased on pref
  mVelocityQueue.AppendElement(std::make_pair(aTimestampMs, mVelocity));
  if (mVelocityQueue.Length() > gfxPrefs::APZMaxVelocityQueueSize()) {
    mVelocityQueue.RemoveElementAt(0);
  }
}