Update background with luma and chroma ref for L C curves Color and Light

rtgui/diagonalcurveeditorsubgroup.cc

@@ -399,6 +399,25 @@ DiagonalCurveEditor* DiagonalCurveEditorSubGroup::addCurve(Glib::ustring curveLa
     return newCE;
 }
 
+
+void DiagonalCurveEditorSubGroup::updateLocallabBackground(CurveEditor* ce)
+{
+    if (ce == parent->displayedCurve) {
+        paramCurve->updateLocallabBackground(ce->locallabRef);
+        customCurve->updateLocallabBackground(ce->locallabRef);
+        NURBSCurve->updateLocallabBackground(ce->locallabRef);
+    }
+}
+
+void DiagonalCurveEditorSubGroup::restoreLocallabBackground()
+{
+    if (parent->displayedCurve) {
+         paramCurve->updateLocallabBackground(parent->displayedCurve->locallabRef);
+         customCurve->updateLocallabBackground(parent->displayedCurve->locallabRef);
+         NURBSCurve->updateLocallabBackground(parent->displayedCurve->locallabRef);
+    }
+}
+
 /*
  * Switch off the edit button
  */

rtgui/diagonalcurveeditorsubgroup.h

@@ -95,6 +95,7 @@ public:
     void pipetteDrag(EditDataProvider *provider, int modifierKey) override;
     void showCoordinateAdjuster(CoordinateProvider *provider) override;
     void stopNumericalAdjustment() override;
+    void updateLocallabBackground(CurveEditor* ce) override;    
 
     bool curveReset (CurveEditor *ce) override;
 
@@ -102,6 +103,7 @@ protected:
     void storeCurveValues (CurveEditor* ce, const std::vector<double>& p) override;
     void storeDisplayedCurve () override;
     void restoreDisplayedHistogram () override;
+    void restoreLocallabBackground() override;
     void savePressed ();
     void loadPressed ();
     void copyPressed ();

rtgui/locallabtools.cc

@@ -1873,6 +1873,11 @@ void LocallabColor::updateMaskBackground(const double normChromar, const double
         HHshape->updateLocallabBackground(normHuer);
         CHshape->updateLocallabBackground(normHuer);
         LHshape->updateLocallabBackground(normHuer);
+        llshape->updateLocallabBackground(normLumar);
+        ccshape->updateLocallabBackground(normChromar);
+        clshape->updateLocallabBackground(normLumar);
+        lcshape->updateLocallabBackground(normChromar);
+        
         return false;
     }
     );

rtgui/mydiagonalcurve.cc

@@ -39,7 +39,9 @@ MyDiagonalCurve::MyDiagonalCurve () :
     ugpX(0.0),
     ugpY(0.0),
     activeParam(-1),
-    bghistvalid(false)
+    bghistvalid(false),
+    locallabRef(0.0)
+
 {
 
     grab_point = -1;
@@ -129,6 +131,36 @@ std::vector<double> MyDiagonalCurve::get_vector (int veclen)
     return vector;
 }
 
+void MyDiagonalCurve::updateLocallabBackground(double ref)
+{
+    locallabRef = ref;
+
+     mcih->pending++;
+
+     idle_register.add(
+        [this]() -> bool
+        {
+            if (mcih->destroyed) {
+                if (mcih->pending == 1) {
+                    delete mcih;
+                } else {
+                    --mcih->pending;
+                }
+
+                 return false;
+            }
+
+             mcih->clearPixmap();
+            mcih->myCurve->queue_draw();
+
+             --mcih->pending;
+
+             return false;
+        }
+    );
+}
+
+
 void MyDiagonalCurve::get_LUT (LUTf &lut)
 {
 
@@ -260,6 +292,20 @@ void MyDiagonalCurve::draw (int handle)
 
     cr->set_line_width (1.0 * s);
 
+    // Draw Locallab reference value in the background
+    if (locallabRef > 0.0) {
+        cr->set_line_width(1.0);
+        cr->move_to(double(graphX + 1), double(graphY - 1));
+        c = style->get_color(state);
+        cr->set_source_rgba(c.get_red(), c.get_green(), c.get_blue(), 0.2);
+        cr->line_to(double(graphX + 1), double(graphY - 1) -  double(graphH - 2));
+        cr->line_to(double(graphX) + 1.5 + locallabRef*double(graphW -2), double(graphY - 1) - double(graphH - 2));
+        cr->line_to(double(graphX) + 1.5 + locallabRef*double(graphW -2), double(graphY - 1));
+        cr->close_path();
+        cr->fill();
+        cr->stroke();
+    }
+
     // draw the left colored bar
     if (leftBar) {
         // first the background

rtgui/mydiagonalcurve.h

@@ -62,6 +62,7 @@ protected:
     int activeParam;
     unsigned int* bghist;   // histogram values
     bool bghistvalid;
+    double locallabRef; // Locallab reference value to display in the background
 
     void draw (int handle);
     void interpolate ();
@@ -91,6 +92,7 @@ public:
     bool pipetteButton1Pressed(EditDataProvider *provider, int modifierKey) override;
     void pipetteButton1Released(EditDataProvider *provider) override;
     void pipetteDrag(EditDataProvider *provider, int modifierKey) override;
+    void updateLocallabBackground(double ref);
 
     void setPos(double pos, int chanIdx) override;
     void stopNumericalAdjustment() override;