diff --git a/libs/image/kis_strokes_queue.cpp b/libs/image/kis_strokes_queue.cpp
index f679d50..fa2a941 100644
--- a/libs/image/kis_strokes_queue.cpp
+++ b/libs/image/kis_strokes_queue.cpp
@@ -200,10 +200,30 @@ KisStrokeId KisStrokesQueue::startStroke(KisStrokeStrategy *strokeStrategy)
m_d->cancelForgettableStrokes();
+ /**
+ * Debugging random non-lod strokes when you expected them to be LoD. When you see a "slow" stroke, check the last debugging line (it appears once per stroke
+ *
+ * Possibilities:
+ *
+ * * If m_d->desiredLevelOfDetail is zero, then some GUI signal has reset the LoD with image->setDesiredLevelOfDetail. That usually happens during zoom
+ *
+ * * [MOST PROBABLE CAUSE] m_d->canUseLodN() --- then there is some slow non-lod stroke is still running and therefore the LoD is not available (this is by design, it can be fixed but needs work)
+ *
+ * * lodBuddyStrategy is null --- the stroke doesn't support lod
+ *
+ * * m_d->lodNNeedsSynchronization --- can only cause a delay before starting a LoD stroke
+ */
+
+ qDebug() << ppVar(m_d->desiredLevelOfDetail) << ppVar(m_d->canUseLodN()) << ppVar(m_d->lodNNeedsSynchronization);
+
+ bool strokeSupportsLod = false;
+
+
if (m_d->desiredLevelOfDetail &&
m_d->canUseLodN() &&
(lodBuddyStrategy =
- strokeStrategy->createLodClone(m_d->desiredLevelOfDetail))) {
+ strokeStrategy->createLodClone(m_d->desiredLevelOfDetail)) &&
+ (strokeSupportsLod = lodBuddyStrategy)) {
if (m_d->lodNNeedsSynchronization) {
m_d->startLod0ToNStroke(m_d->desiredLevelOfDetail, false);
@@ -232,6 +252,18 @@ KisStrokeId KisStrokesQueue::startStroke(KisStrokeStrategy *strokeStrategy)
}
} else {
+ if (m_d->desiredLevelOfDetail &&
+ strokeSupportsLod &&
+ !m_d->canUseLodN()) {
+
+ qDebug() << "Failed to start a LodN stroke although the strategy supports it!";
+ qDebug() << "Dump of currently running strokes:";
+
+ Q_FOREACH (KisStrokeSP stroke, m_d->strokesQueue) {
+ qDebug() << ppVar(stroke->name()) << ppVar(stroke->type());
+ }
+ }
+
stroke = KisStrokeSP(new KisStroke(strokeStrategy, KisStroke::LEGACY, 0));
m_d->strokesQueue.enqueue(stroke);
}