Updatet ui fixed bugs, improved performance, just everything

Autors:
@DerAnonymos
@AshBastian
@Sonaion

src/Tool/IntelliTool.cpp

@@ -24,10 +24,10 @@ void IntelliTool::onMouseRightReleased(int x, int y){
 }
 
 void IntelliTool::onMouseLeftPressed(int x, int y){
-		this->isDrawing=true;
-		//create drawing layer
-		this->createToolLayer();
-		Canvas->image->calculateVisiblity();
+        this->isDrawing=this->createToolLayer();
+        if(isDrawing){
+            Canvas->image->calculateVisiblity();
+        }
 }
 
 void IntelliTool::onMouseLeftReleased(int x, int y){
@@ -48,18 +48,23 @@ void IntelliTool::onWheelScrolled(int value){
 		//if needed for future general tasks implement in here
 }
 
-void IntelliTool::createToolLayer(){
-		Area->createTempTopLayer(Area->activeLayer);
-		this->activeLayer=&Area->layerBundle[static_cast<unsigned long long>(Area->activeLayer)];
-		this->Canvas=&Area->layerBundle[static_cast<unsigned long long>(Area->activeLayer+1)];
+bool IntelliTool::createToolLayer(){
+        if(Area->createTempTopLayer(Area->activeLayer)){
+            this->activeLayer=&Area->layerBundle[static_cast<unsigned long long>(Area->activeLayer)];
+            this->Canvas=&Area->layerBundle[static_cast<unsigned long long>(Area->activeLayer+1)];
+            return true;
+        }
+        return false;
 }
 
 void IntelliTool::mergeToolLayer(){
 		QColor clr_0;
 		QColor clr_1;
+        QImage updatedImage = activeLayer->image->getImageData();
+
 		for(int y=0; y<activeLayer->height; y++) {
-				for(int x=0; x<activeLayer->width; x++) {
-						clr_0=activeLayer->image->imageData.pixelColor(x,y);
+                for(int x=0; x<activeLayer->width; x++) {
+                        clr_0=updatedImage.pixelColor(x,y);
 						clr_1=Canvas->image->imageData.pixelColor(x,y);
 						float t = static_cast<float>(clr_1.alpha())/255.f;
 						int r =static_cast<int>(static_cast<float>(clr_1.red())*(t)+static_cast<float>(clr_0.red())*(1.f-t)+0.5f);
@@ -71,10 +76,11 @@ void IntelliTool::mergeToolLayer(){
 						clr_0.setBlue(b);
 						clr_0.setAlpha(a);
 
-						activeLayer->image->imageData.setPixelColor(x, y, clr_0);
+                        updatedImage.setPixelColor(x, y, clr_0);
 				}
 		}
-		Area->DumpyGui->UpdateGui();
+        activeLayer->image->setImageData(updatedImage);
+        Area->DummyGui->UpdateGui();
 }
 
 void IntelliTool::deleteToolLayer(){

src/Tool/IntelliTool.h

@@ -25,8 +25,9 @@ enum class Tooltype {
 private:
 /*!
  * \brief A function that creates a layer to draw on.
+ * \return Returns if a layer could be created
  */
-void createToolLayer();
+bool createToolLayer();
 
 /*!
  * \brief A function that merges the drawing- and the active- layer.

src/Tool/IntelliToolCircle.cpp

@@ -57,10 +57,12 @@ void IntelliToolCircle::onMouseRightReleased(int x, int y){
 
 void IntelliToolCircle::onMouseLeftPressed(int x, int y){
 		IntelliTool::onMouseLeftPressed(x,y);
-		this->centerPoint=QPoint(x,y);
-		int radius = 1;
-		drawCircle(radius);
-		Canvas->image->calculateVisiblity();
+        if(this->isDrawing){
+            this->centerPoint=QPoint(x,y);
+            int radius = 1;
+            drawCircle(radius);
+            Canvas->image->calculateVisiblity();
+        }
 }
 
 void IntelliToolCircle::onMouseLeftReleased(int x, int y){