chore: remove notion of default background in render, each screen needs it's own independent render

src/WallpaperEngine/Application/CWallpaperApplication.cpp

@@ -157,18 +157,19 @@ void CWallpaperApplication::setupContainer (CCombinedContainer& container, const
 }
 
 void CWallpaperApplication::loadBackgrounds () {
-    for (const auto& [background, path] : this->m_context.settings.general.screenBackgrounds) {
-        // ignore the screen settings if there was no background specified
-        // the default will be used
-        if (path.empty ())
-            continue;
-
-        this->m_backgrounds [background] = this->loadBackground (path);
+    // load default background if specified
+    if (!this->m_context.settings.general.defaultBackground.empty()) {
+        this->m_defaultBackground = this->loadBackground (this->m_context.settings.general.defaultBackground);
     }
 
-    // load the default project if required
-    if (!this->m_context.settings.general.defaultBackground.empty ())
-        this->m_defaultBackground = this->loadBackground (this->m_context.settings.general.defaultBackground);
+    for (const auto& [background, path] : this->m_context.settings.general.screenBackgrounds) {
+        // screens with no background should use the default
+        if (path.empty ()) {
+            this->m_backgrounds [background] = this->m_defaultBackground;
+        } else {
+            this->m_backgrounds [background] = this->loadBackground (path);
+        }
+    }
 }
 
 Core::CProject* CWallpaperApplication::loadBackground (const std::string& bg) {
@@ -292,17 +293,14 @@ void CWallpaperApplication::show () {
     // initialize render context
     context = new WallpaperEngine::Render::CRenderContext (*videoDriver, *inputContext, *this);
 
+    // create a new background for each screen
+
     // set all the specific wallpapers required
-    for (const auto& [background, info] : this->m_backgrounds)
+    for (const auto& [background, info] : this->m_backgrounds) {
         context->setWallpaper (background, WallpaperEngine::Render::CWallpaper::fromWallpaper (
                                                info->getWallpaper (), *context, *audioContext, browserContext,
                                                this->m_context.settings.general.screenScalings [background]));
-
-    // set the default rendering wallpaper if available
-    if (this->m_defaultBackground != nullptr)
-        context->setDefaultWallpaper (WallpaperEngine::Render::CWallpaper::fromWallpaper (
-            this->m_defaultBackground->getWallpaper (), *context, *audioContext, browserContext,
-            this->m_context.settings.render.window.scalingMode));
+    }
 
     // wallpapers are setup, free browsesr context if possible
     if (!this->browserContext.isUsed()) {

src/WallpaperEngine/Render/CRenderContext.cpp

@@ -10,7 +10,6 @@
 namespace WallpaperEngine::Render {
 CRenderContext::CRenderContext (Drivers::CVideoDriver& driver, Input::CInputContext& input,
                                 CWallpaperApplication& app) :
-    m_defaultWallpaper (nullptr),
     m_driver (driver),
     m_app (app),
     m_input (input),
@@ -31,8 +30,6 @@ void CRenderContext::render (Drivers::Output::COutputViewport* viewport) {
     // render the background
     if (ref != this->m_wallpapers.end ())
         ref->second->render (viewport->viewport, this->getOutput ().renderVFlip ());
-    else
-        this->m_defaultWallpaper->render (viewport->viewport, this->getOutput ().renderVFlip ());
 
 #if !NDEBUG
     glPopDebugGroup ();
@@ -41,10 +38,6 @@ void CRenderContext::render (Drivers::Output::COutputViewport* viewport) {
     viewport->swapOutput ();
 }
 
-void CRenderContext::setDefaultWallpaper (CWallpaper* wallpaper) {
-    this->m_defaultWallpaper = wallpaper;
-}
-
 void CRenderContext::setWallpaper (const std::string& display, CWallpaper* wallpaper) {
     this->m_wallpapers.insert_or_assign (display, wallpaper);
 }

src/WallpaperEngine/Render/CRenderContext.h

@@ -34,7 +34,6 @@ class CRenderContext {
     CRenderContext (Drivers::CVideoDriver& driver, Input::CInputContext& input, CWallpaperApplication& app);
 
     void render (Drivers::Output::COutputViewport* viewport);
-    void setDefaultWallpaper (CWallpaper* wallpaper);
     void setWallpaper (const std::string& display, CWallpaper* wallpaper);
     [[nodiscard]] Input::CInputContext& getInputContext () const;
     [[nodiscard]] const CWallpaperApplication& getApp () const;
@@ -47,8 +46,6 @@ class CRenderContext {
     Drivers::CVideoDriver& m_driver;
     /** Maps screen -> wallpaper list */
     std::map<std::string, CWallpaper*> m_wallpapers;
-    /** Default wallpaper to use */
-    CWallpaper* m_defaultWallpaper;
     /** Input context for interactions */
     Input::CInputContext& m_input;
     /** App that holds the render context */