Fix ImageKnob for types that need full repaints

Signed-off-by: falkTX <falktx@falktx.com>

dgl/EventHandlers.hpp

@@ -112,7 +112,7 @@ public:
     float getValue() const noexcept;
 
     // NOTE: value is assumed to be scaled if using log
-    void setValue(float value, bool sendCallback = false) noexcept;
+    virtual bool setValue(float value, bool sendCallback = false) noexcept;
 
     // returns 0-1 ranged value, already with log scale as needed
     float getNormalizedValue() const noexcept;

dgl/ImageBaseWidgets.hpp

@@ -103,6 +103,7 @@ public:
     void setCallback(Callback* callback) noexcept;
     void setImageLayerCount(uint count) noexcept;
     void setRotationAngle(int angle);
+    bool setValue(float value, bool sendCallback = false) noexcept override;
 
 protected:
     void onDisplay() override;

dgl/src/EventHandlers.cpp

@@ -515,10 +515,10 @@ struct KnobEventHandler::PrivateData {
         maximum = max;
     }
 
-    void setValue(const float value2, const bool sendCallback)
+    bool setValue(const float value2, const bool sendCallback)
     {
         if (d_isEqual(value, value2))
-            return;
+            return false;
 
         valueTmp = value = value2;
         widget->repaint();
@@ -529,6 +529,8 @@ struct KnobEventHandler::PrivateData {
                 callback->knobValueChanged(widget, value);
             } DISTRHO_SAFE_EXCEPTION("KnobEventHandler::setValue");
         }
+
+        return true;
     }
 };
 
@@ -556,9 +558,9 @@ float KnobEventHandler::getValue() const noexcept
     return pData->value;
 }
 
-void KnobEventHandler::setValue(const float value, const bool sendCallback) noexcept
+bool KnobEventHandler::setValue(const float value, const bool sendCallback) noexcept
 {
-    pData->setValue(value, sendCallback);
+    return pData->setValue(value, sendCallback);
 }
 
 float KnobEventHandler::getNormalizedValue() const noexcept

dgl/src/ImageBaseWidgets.cpp

@@ -361,6 +361,20 @@ void ImageBaseKnob<ImageType>::setRotationAngle(int angle)
     pData->isReady = false;
 }
 
+template <class ImageType>
+bool ImageBaseKnob<ImageType>::setValue(float value, bool sendCallback) noexcept
+{
+    if (KnobEventHandler::setValue(value, sendCallback))
+    {
+        if (pData->rotationAngle == 0 || pData->alwaysRepaint)
+            pData->isReady = false;
+
+        return true;
+    }
+
+    return false;
+}
+
 template <class ImageType>
 bool ImageBaseKnob<ImageType>::onMouse(const MouseEvent& ev)
 {