find unused tiles

include/ui/tileseteditor.h

@@ -77,6 +77,7 @@ private slots:
 
     void on_actionShow_Unused_toggled(bool checked);
     void on_actionShow_Counts_toggled(bool checked);
+    void on_actionShow_UnusedTiles_toggled(bool checked);
 
     void on_actionUndo_triggered();
 
@@ -123,6 +124,7 @@ private:
     void saveMetatileLabel();
     void closeEvent(QCloseEvent*);
     void countMetatileUsage();
+    void countTileUsage();
 
     Ui::TilesetEditor *ui;
     History<MetatileHistoryItem*> metatileHistory;

include/ui/tileseteditormetatileselector.h

@@ -17,7 +17,6 @@ public:
     void updateSelectedMetatile();
     QPoint getMetatileIdCoordsOnWidget(uint16_t metatileId);
 
-    // 
     QVector<uint16_t> usedMetatiles;
     bool selectorShowUnused = false;
     bool selectorShowCounts = false;

include/ui/tileseteditortileselector.h

@@ -31,6 +31,9 @@ public:
     QImage buildPrimaryTilesIndexedImage();
     QImage buildSecondaryTilesIndexedImage();
 
+    QVector<uint16_t> usedTiles;
+    bool showUnused = false;
+
 protected:
     void mousePressEvent(QGraphicsSceneMouseEvent*);
     void mouseMoveEvent(QGraphicsSceneMouseEvent*);
@@ -59,6 +62,8 @@ private:
     QList<QRgb> getCurPaletteTable();
     QList<Tile> buildSelectedTiles(int, int, QList<Tile>);
 
+    void drawUnused();
+
 signals:
     void hoveredTileChanged(uint16_t);
     void hoveredTileCleared();