Some GDI fixes

src/common/platform/kernel_mapped.hpp

@@ -289,7 +289,7 @@ typedef struct _PEB64
     ULONG MaximumNumberOfHeaps;
     std::uint64_t** ProcessHeaps; // PHEAP
 
-    std::uint64_t* GdiSharedHandleTable; // PGDI_SHARED_MEMORY
+    std::uint64_t GdiSharedHandleTable; // PGDI_SHARED_MEMORY
     std::uint64_t* ProcessStarterHelper;
     ULONG GdiDCAttributeList;
 

src/common/platform/process.hpp

@@ -846,8 +846,13 @@ struct GDI_HANDLE_ENTRY64
 struct GDI_SHARED_MEMORY64
 {
     GDI_HANDLE_ENTRY64 Handles[GDI_MAX_HANDLE_COUNT];
+    char pad[0xC8];
+    uint64_t Objects[0x20];
+    uint64_t Data[0x200]; // ?
 };
 
+static_assert(offsetof(GDI_SHARED_MEMORY64, Objects) == 0x1800B0);
+
 struct CLIENT_ID64
 {
     DWORD64 UniqueProcess;