1 files changed, 16 insertions, 16 deletions
diff --git a/include/mbgl/style/layers/raster_layer.hpp b/include/mbgl/style/layers/raster_layer.hpp
index f4736c9dcd..bdd9857c39 100644
--- a/include/mbgl/style/layers/raster_layer.hpp
+++ b/include/mbgl/style/layers/raster_layer.hpp
@@ -25,50 +25,50 @@ public:
     // Paint properties
 
     static PropertyValue<float> getDefaultRasterOpacity();
-    PropertyValue<float> getRasterOpacity() const;
-    void setRasterOpacity(PropertyValue<float>);
+    const PropertyValue<float>& getRasterOpacity() const;
+    void setRasterOpacity(const PropertyValue<float>&);
     void setRasterOpacityTransition(const TransitionOptions&);
     TransitionOptions getRasterOpacityTransition() const;
 
     static PropertyValue<float> getDefaultRasterHueRotate();
-    PropertyValue<float> getRasterHueRotate() const;
-    void setRasterHueRotate(PropertyValue<float>);
+    const PropertyValue<float>& getRasterHueRotate() const;
+    void setRasterHueRotate(const PropertyValue<float>&);
     void setRasterHueRotateTransition(const TransitionOptions&);
     TransitionOptions getRasterHueRotateTransition() const;
 
     static PropertyValue<float> getDefaultRasterBrightnessMin();
-    PropertyValue<float> getRasterBrightnessMin() const;
-    void setRasterBrightnessMin(PropertyValue<float>);
+    const PropertyValue<float>& getRasterBrightnessMin() const;
+    void setRasterBrightnessMin(const PropertyValue<float>&);
     void setRasterBrightnessMinTransition(const TransitionOptions&);
     TransitionOptions getRasterBrightnessMinTransition() const;
 
     static PropertyValue<float> getDefaultRasterBrightnessMax();
-    PropertyValue<float> getRasterBrightnessMax() const;
-    void setRasterBrightnessMax(PropertyValue<float>);
+    const PropertyValue<float>& getRasterBrightnessMax() const;
+    void setRasterBrightnessMax(const PropertyValue<float>&);
     void setRasterBrightnessMaxTransition(const TransitionOptions&);
     TransitionOptions getRasterBrightnessMaxTransition() const;
 
     static PropertyValue<float> getDefaultRasterSaturation();
-    PropertyValue<float> getRasterSaturation() const;
-    void setRasterSaturation(PropertyValue<float>);
+    const PropertyValue<float>& getRasterSaturation() const;
+    void setRasterSaturation(const PropertyValue<float>&);
     void setRasterSaturationTransition(const TransitionOptions&);
     TransitionOptions getRasterSaturationTransition() const;
 
     static PropertyValue<float> getDefaultRasterContrast();
-    PropertyValue<float> getRasterContrast() const;
-    void setRasterContrast(PropertyValue<float>);
+    const PropertyValue<float>& getRasterContrast() const;
+    void setRasterContrast(const PropertyValue<float>&);
     void setRasterContrastTransition(const TransitionOptions&);
     TransitionOptions getRasterContrastTransition() const;
 
     static PropertyValue<RasterResamplingType> getDefaultRasterResampling();
-    PropertyValue<RasterResamplingType> getRasterResampling() const;
-    void setRasterResampling(PropertyValue<RasterResamplingType>);
+    const PropertyValue<RasterResamplingType>& getRasterResampling() const;
+    void setRasterResampling(const PropertyValue<RasterResamplingType>&);
     void setRasterResamplingTransition(const TransitionOptions&);
     TransitionOptions getRasterResamplingTransition() const;
 
     static PropertyValue<float> getDefaultRasterFadeDuration();
-    PropertyValue<float> getRasterFadeDuration() const;
-    void setRasterFadeDuration(PropertyValue<float>);
+    const PropertyValue<float>& getRasterFadeDuration() const;
+    void setRasterFadeDuration(const PropertyValue<float>&);
     void setRasterFadeDurationTransition(const TransitionOptions&);
     TransitionOptions getRasterFadeDurationTransition() const;