feat(ui): implement CSimpleFrame_SetBackdropColor

src/ui/CBackdropGenerator.cpp

@@ -383,3 +383,11 @@ void CBackdropGenerator::SetOutput(CSimpleFrame* frame) {
         bottomRightTexture->SetBlendMode(this->m_blend);
     }
 }
+
+void CBackdropGenerator::SetVertexColor(const CImVector& color) {
+    this->m_color = color;
+
+    if (this->m_backgroundTexture) {
+        this->m_backgroundTexture->SetVertexColor(this->m_color);
+    }
+}

src/ui/CBackdropGenerator.hpp

@@ -44,6 +44,7 @@ class CBackdropGenerator {
         void LoadXML(XMLNode* node, CStatus* status);
         void SetBorderVertexColor(const CImVector& borderColor);
         void SetOutput(CSimpleFrame* frame);
+        void SetVertexColor(const CImVector& color);
 };
 
 #endif

src/ui/CSimpleFrameScript.cpp

@@ -1,5 +1,6 @@
 #include "ui/CSimpleFrameScript.hpp"
 #include "gx/Coordinate.hpp"
+#include "ui/CBackdropGenerator.hpp"
 #include "ui/CSimpleFrame.hpp"
 #include "ui/FrameScript.hpp"
 #include "util/Lua.hpp"
@@ -460,7 +461,17 @@ int32_t CSimpleFrame_GetBackdropColor(lua_State* L) {
 }
 
 int32_t CSimpleFrame_SetBackdropColor(lua_State* L) {
-    WHOA_UNIMPLEMENTED(0);
+    auto type = CSimpleFrame::GetObjectType();
+    auto frame = static_cast<CSimpleFrame*>(FrameScript_GetObjectThis(L, type));
+
+    CImVector color = { 0x00 };
+    FrameScript_GetColor(L, 2, color);
+
+    if (frame->m_backdrop) {
+        frame->m_backdrop->SetVertexColor(color);
+    }
+
+    return 0;
 }
 
 int32_t CSimpleFrame_GetBackdropBorderColor(lua_State* L) {