add small scenery preview

src/object/ObjectRepository.cpp

@@ -668,7 +668,9 @@ extern "C"
     void * object_repository_load_object(const rct_object_entry * objectEntry)
     {
         IObjectRepository * objRepository = GetObjectRepository();
-        return (void *)objRepository->LoadObject(objectEntry);
+        Object * object = objRepository->LoadObject(objectEntry);
+        object->Load();
+        return (void *)object;
     }
 
     void object_repository_unload(size_t itemIndex)
@@ -791,7 +793,9 @@ extern "C"
 
     void object_delete(void * object)
     {
-        delete ((Object *)object);
+        Object * baseObject = (Object *)object;
+        baseObject->Unload();
+        delete baseObject;
     }
 
     const utf8 * object_get_description(const void * object)

src/object/SmallSceneryObject.cpp

@@ -15,6 +15,7 @@
 #pragma endregion
 
 #include "../core/IStream.hpp"
+#include "../core/Math.hpp"
 #include "../core/Memory.hpp"
 #include "SmallSceneryObject.h"
 
@@ -89,6 +90,58 @@ void SmallSceneryObject::Unload()
     gfx_object_free_images(_legacyType.image, GetImageTable()->GetCount());
 }
 
+void SmallSceneryObject::DrawPreview(rct_drawpixelinfo * dpi) const
+{
+    // rct_drawpixelinfo clipDPI;
+    // if (!clip_drawpixelinfo(&clipDPI, dpi, x - 56, y - 56, 112, 112)) {
+    //     return;
+    // }
+
+    uint32 flags = _legacyType.small_scenery.flags;
+    uint32 imageId = _legacyType.image;
+    if (flags & SMALL_SCENERY_FLAG_HAS_PRIMARY_COLOUR)
+    {
+        imageId |= 0x20D00000;
+        if (flags & SMALL_SCENERY_FLAG_HAS_SECONDARY_COLOUR)
+        {
+            imageId |= 0x92000000;
+        }
+    }
+
+    int x = dpi->width / 2;
+    int y = (dpi->height / 2) + (_legacyType.small_scenery.height / 2);
+    y = Math::Min(y, dpi->height - 16);
+
+    if ((flags & SMALL_SCENERY_FLAG_FULL_TILE) &&
+        (flags & SMALL_SCENERY_FLAG_VOFFSET_CENTRE))
+    {
+        y -= 12;
+    }
+
+    gfx_draw_sprite(dpi, imageId, x, y, 0);
+
+    if (_legacyType.small_scenery.flags & SMALL_SCENERY_FLAG_HAS_GLASS)
+    {
+        imageId = _legacyType.image + 0x44500004;
+        if (flags & SMALL_SCENERY_FLAG_HAS_SECONDARY_COLOUR)
+        {
+            imageId |= 0x92000000;
+        }
+        gfx_draw_sprite(dpi, imageId, x, y, 0);
+    }
+
+    if (flags & SMALL_SCENERY_FLAG_ANIMATED_FG)
+    {
+        imageId = _legacyType.image + 4;
+        if (flags & SMALL_SCENERY_FLAG_HAS_SECONDARY_COLOUR)
+        {
+            imageId |= 0x92000000;
+        }
+        gfx_draw_sprite(dpi, imageId, x, y, 0);
+    }
+}
+
+
 const utf8 * SmallSceneryObject::GetName() const
 {
     const utf8 * name = GetStringTable()->GetString(OBJ_STRING_ID_NAME);

src/object/SmallSceneryObject.h

@@ -40,6 +40,8 @@ public:
     void Load() override;
     void Unload() override;
 
+    void DrawPreview(rct_drawpixelinfo * dpi) const;
+
     const utf8 * GetName() const override;
 
 private: