Refactor RectBase to allow blit to RenderTarget

include/JUI/Base/RectBase.hpp

@@ -15,6 +15,7 @@
 #include <Event.h>
 
 #include <Color4.hpp>
+#include "JGL/types/RenderTarget.h"
 
 namespace JUI
 {
@@ -77,5 +78,7 @@ namespace JUI
         Color4 border_color = {192, 192, 192, 0};
         bool clips_descendants = false; // Controls if child objects can render outside of their parent's rectangle bounds.
         float corner_rounding_radius = 0.f; // Curves the rectangle corners by N degrees.
+        void Draw(JGL::RenderTarget *canvas, const Color4 &bgColor, const Color4 &borderColor, const Vector2 &abs_pos,
+                  const Vector2 &abs_size);
     };
 }

src/JUI/Base/RectBase.cpp

@@ -35,7 +35,12 @@ namespace JUI {
 
     void RectBase::Draw(const Color4& bgColor, const Color4& borderColor, const Vector2 &abs_pos, const Vector2 &abs_size) {
 
-        J2D::Begin();
+        Draw(nullptr, bgColor, borderColor, abs_pos, abs_size);
+    }
+
+    void RectBase::Draw(JGL::RenderTarget* canvas, const Color4& bgColor, const Color4& borderColor, const Vector2 &abs_pos, const Vector2 &abs_size) {
+
+        J2D::Begin(canvas, false);
 
         // Background rect
         if (corner_rounding_radius > 0)