tr2/shell: reload background image on aspect change

Resolves #2832.

docs/tr2/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## [Unreleased](https://github.com/LostArtefacts/TRX/compare/tr2-1.0...develop) - ××××-××-××
 - fixed the selected keyboard/controller layout not being saved (#2830, regression from 1.0)
 - fixed toggling the PSX FOV option not having an immediate effect (#2831, regression from 1.0)
+- fixed changing the aspect ratio not updating the current background image (#2832, regression from 1.0)
 
 ## [1.0](https://github.com/LostArtefacts/TRX/compare/tr2-0.10...tr2-1.0) - 2025-04-23
 - added support for The Golden Mask (#1621)

src/libtrx/game/output/background.c

@@ -2,6 +2,7 @@
 
 #include "debug.h"
 #include "filesystem.h"
+#include "game/output/common.h"
 #include "game/viewport.h"
 #include "log.h"
 #include "memory.h"
@@ -198,6 +199,18 @@ bool Output_LoadBackgroundFromFile(const char *const path)
     return result;
 }
 
+void Output_ReloadBackgroundImage(void)
+{
+    if (m_LastPath == nullptr) {
+        return;
+    }
+
+    char *prev = Memory_DupStr(m_LastPath);
+    Output_UnloadBackground();
+    Output_LoadBackgroundFromFile(prev);
+    Memory_FreePointer(&prev);
+}
+
 char *Output_GetLastBackgroundPath(void)
 {
     return m_LastPath;

src/libtrx/include/libtrx/game/output/background.h

@@ -3,6 +3,7 @@
 #include "../../engine/image.h"
 
 bool Output_LoadBackgroundFromFile(const char *path);
+void Output_ReloadBackgroundImage(void);
 
 extern bool Output_LoadBackgroundFromImage(const IMAGE *image);
 extern void Output_LoadBackgroundFromObject(void);

src/tr2/game/shell/common.c

@@ -427,6 +427,10 @@ static void M_HandleConfigChange(const EVENT *const event, void *const data)
         || CHANGED(visuals.water_color.r)) {
         Output_ApplyLevelSettings();
     }
+
+    if (CHANGED(rendering.aspect_mode)) {
+        Output_ReloadBackgroundImage();
+    }
 }
 
 // TODO: refactor the hell out of me