Remove redundant data from KItemListViewLayouter's ItemInfo struct

It is not necessary to save the position of each item as a QPointF
because all items in a row will have the same y-coordinate, and all
items in a column will have the same x-coordinate. Therefore, we can
reduce the number of doubles that we store from

(number of items) * 2

to

(number of rows) + (number of colums)

which is at least 50% less.

REVIEW: 114460

1 files changed, 3 insertions, 1 deletions

diff --git a/src/kitemviews/private/kitemlistviewlayouter.h b/src/kitemviews/private/kitemlistviewlayouter.h
index a3b0893a1..19b14796d 100644
--- a/src/kitemviews/private/kitemlistviewlayouter.h
+++ b/src/kitemviews/private/kitemlistviewlayouter.h
@@ -220,6 +220,9 @@ private:
     qreal m_xPosInc;
     int m_columnCount;
 
+    QVector<qreal> m_rowOffsets;
+    QVector<qreal> m_columnOffsets;
+
     // Stores all item indexes that are the first item of a group.
     // Assures fast access for KItemListViewLayouter::isFirstGroupItem().
     QSet<int> m_groupItemIndexes;
@@ -227,7 +230,6 @@ private:
     qreal m_groupHeaderMargin;
 
     struct ItemInfo {
-        QPointF pos;
         int column;
         int row;
     };