Make Element::IsReplaced virtual

This way, we no longer have to get the intrinsic dimensions just to determine whether the element is replaced. This can save some time e.g. from an image being loaded to retrieve its dimensions.

Include/RmlUi/Core/Element.h

@@ -180,7 +180,7 @@ public:
 	virtual bool GetIntrinsicDimensions(Vector2f& dimensions, float& ratio);
 	/// Returns true if the element is replaced, thereby handling its own rendering.
 	/// @return True if the element is a replaced element.
-	bool IsReplaced();
+	virtual bool IsReplaced();
 
 	/// Checks if a given point in screen coordinates lies within the bordered area of this element.
 	/// @param[in] point The point to test.

Include/RmlUi/Lottie/ElementLottie.h

@@ -50,6 +50,9 @@ public:
 	/// Returns the element's inherent size.
 	bool GetIntrinsicDimensions(Vector2f& dimensions, float& ratio) override;
 
+	/// Returns true if the element is replaced.
+	bool IsReplaced() override;
+
 	/// Loads the current source file if needed. This normally happens automatically during layouting.
 	void EnsureSourceLoaded();
 

Include/RmlUi/SVG/ElementSVG.h

@@ -47,6 +47,9 @@ public:
 	/// Returns the element's inherent size.
 	bool GetIntrinsicDimensions(Vector2f& dimensions, float& ratio) override;
 
+	/// Returns true if the element is replaced.
+	bool IsReplaced() override;
+
 	/// Loads the current source file if needed. This normally happens automatically during layouting.
 	void EnsureSourceLoaded();
 

Source/Core/Elements/ElementImage.cpp

@@ -93,6 +93,12 @@ bool ElementImage::GetIntrinsicDimensions(Vector2f& _dimensions, float& _ratio)
 
 	return true;
 }
+
+bool ElementImage::IsReplaced()
+{
+	return true;
+}
+
 void ElementImage::EnsureSourceLoaded()
 {
 	if (texture_dirty)

Source/Core/Elements/ElementImage.h

@@ -74,6 +74,9 @@ public:
 	/// Returns the element's inherent size.
 	bool GetIntrinsicDimensions(Vector2f& dimensions, float& ratio) override;
 
+	/// Returns true if the element is replaced.
+	bool IsReplaced() override;
+
 	/// Loads the current source file if needed. This normally happens automatically during layouting.
 	void EnsureSourceLoaded();
 

Source/Lottie/ElementLottie.cpp

@@ -56,6 +56,11 @@ bool ElementLottie::GetIntrinsicDimensions(Vector2f& dimensions, float& ratio)
 	return true;
 }
 
+bool ElementLottie::IsReplaced()
+{
+	return true;
+}
+
 void ElementLottie::EnsureSourceLoaded()
 {
 	if (animation_dirty)

Source/SVG/ElementSVG.cpp

@@ -61,6 +61,11 @@ bool ElementSVG::GetIntrinsicDimensions(Vector2f& dimensions, float& ratio)
 	return true;
 }
 
+bool ElementSVG::IsReplaced()
+{
+	return true;
+}
+
 void ElementSVG::EnsureSourceLoaded()
 {
 	UpdateCachedData();