Load background image using existing texture system

- Removed manual QImage loading and texture setup for background image in MapCanvas::initializeGL().
- Background image is now loaded via loadTexture() in initTextures(), using the same fallback mechanism as other modding assets.
- Renamed 'background.png' to 'background-image.png' for consistency and alignment with naming in mmapper2.qrc.

Author: Sunnyl75

src/display/Textures.cpp

@@ -255,6 +255,9 @@ void MapCanvas::initTextures()
     textures.room_needs_update = loadTexture(getPixmapFilenameRaw("room-needs-update.png"));
     textures.room_modified = loadTexture(getPixmapFilenameRaw("room-modified.png"));
 
+    textures.backgroundImage = loadTexture(getPixmapFilenameRaw("background-image.png"));
+
+
     {
         textures.for_each([this](SharedMMTexture &pTex) -> void {
             auto &tex = deref(pTex);

src/display/mapcanvas_gl.cpp

@@ -244,30 +244,6 @@ void MapCanvas::initializeGL()
     // REVISIT: should the font texture have the lowest ID?
     initTextures();
 
-    {
-        QImage image(":/pixmaps/arda-map.png");
-        image = image.mirrored();
-
-        if (!image.isNull()) {
-            // Load the image into the backgroundImage texture
-            m_textures.loadCustomTexture(
-                m_textures.backgroundImage,
-                "BackgroundImage", // Just a label
-                QOpenGLTexture::Target2D,
-                image);
-
-            // Register the texture properly with OpenGL
-            if (m_textures.backgroundImage) {
-                auto &tex = deref(m_textures.backgroundImage);
-                const auto id = allocateTextureId();
-                tex.setId(id);
-                m_opengl.setTextureLookup(id, m_textures.backgroundImage);
-            }
-        } else {
-            qWarning() << "Failed to load background image.";
-        }
-    }
-
     auto &font = getGLFont();
     font.setTextureId(allocateTextureId());
     font.init();
@@ -574,7 +550,9 @@ void MapCanvas::actuallyPaintGL()
     auto &gl = getOpenGL();
     gl.clear(Color{getConfig().canvas.backgroundColor});
 
-    if (m_textures.backgroundImage && m_textures.backgroundImage->getId() != INVALID_MM_TEXTURE_ID) {
+    if (getConfig().canvas.showBackgroundImage.get()
+        && m_textures.backgroundImage
+        && m_textures.backgroundImage->getId() != INVALID_MM_TEXTURE_ID) {
         const auto &tex = m_textures.backgroundImage;
 
         // Z is arbitrary since we don't rely on depth testing here

src/resources/mmapper2.qrc

@@ -1,5 +1,5 @@
-<!DOCTYPE RCC><RCC version="1.0">
-    <qresource>
+<RCC>
+    <qresource prefix="/">
         <file>LICENSE.GLM</file>
         <file>LICENSE.GPL2</file>
         <file>LICENSE.LGPL</file>
@@ -84,6 +84,7 @@
         <file>icons/viewmag+.png</file>
         <file>icons/viewmag-.png</file>
         <file>icons/viewmagfit.png</file>
+        <file>pixmaps/background-image.png</file>
         <file>pixmaps/char-arrows.png</file>
         <file>pixmaps/char-room-sel.png</file>
         <file>pixmaps/door-down.png</file>