ntgdi.h

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#ifndef _NTGDI_H
#define _NTGDI_H

#define GDI_MAX_HANDLE_COUNT 0x4000

#define GDI_HANDLE_INDEX_SHIFT 0
#define GDI_HANDLE_INDEX_BITS 16
#define GDI_HANDLE_INDEX_MASK 0xffff

#define GDI_HANDLE_TYPE_SHIFT 16
#define GDI_HANDLE_TYPE_BITS 5
#define GDI_HANDLE_TYPE_MASK 0x1f

#define GDI_HANDLE_ALTTYPE_SHIFT 21
#define GDI_HANDLE_ALTTYPE_BITS 2
#define GDI_HANDLE_ALTTYPE_MASK 0x3

#define GDI_HANDLE_STOCK_SHIFT 23
#define GDI_HANDLE_STOCK_BITS 1
#define GDI_HANDLE_STOCK_MASK 0x1

#define GDI_HANDLE_UNIQUE_SHIFT 24
#define GDI_HANDLE_UNIQUE_BITS 8
#define GDI_HANDLE_UNIQUE_MASK 0xff

#define GDI_HANDLE_INDEX(Handle) ((ULONG)(Handle) & GDI_HANDLE_INDEX_MASK)
#define GDI_HANDLE_TYPE(Handle) (((ULONG)(Handle) >> GDI_HANDLE_TYPE_SHIFT) & GDI_HANDLE_TYPE_MASK)
#define GDI_HANDLE_ALTTYPE(Handle) (((ULONG)(Handle) >> GDI_HANDLE_ALTTYPE_SHIFT) & GDI_HANDLE_ALTTYPE_MASK)
#define GDI_HANDLE_STOCK(Handle) (((ULONG)(Handle) >> GDI_HANDLE_STOCK_SHIFT)) & GDI_HANDLE_STOCK_MASK)

#define GDI_MAKE_HANDLE(Index, Unique) ((ULONG)(((ULONG)(Unique) << GDI_HANDLE_INDEX_BITS) | (ULONG)(Index)))

// GDI server-side types

#define GDI_DEF_TYPE 0 // invalid handle
#define GDI_DC_TYPE 1
#define GDI_DD_DIRECTDRAW_TYPE 2
#define GDI_DD_SURFACE_TYPE 3
#define GDI_RGN_TYPE 4
#define GDI_SURF_TYPE 5
#define GDI_CLIENTOBJ_TYPE 6
#define GDI_PATH_TYPE 7
#define GDI_PAL_TYPE 8
#define GDI_ICMLCS_TYPE 9
#define GDI_LFONT_TYPE 10
#define GDI_RFONT_TYPE 11
#define GDI_PFE_TYPE 12
#define GDI_PFT_TYPE 13
#define GDI_ICMCXF_TYPE 14
#define GDI_ICMDLL_TYPE 15
#define GDI_BRUSH_TYPE 16
#define GDI_PFF_TYPE 17 // unused
#define GDI_CACHE_TYPE 18 // unused
#define GDI_SPACE_TYPE 19
#define GDI_DBRUSH_TYPE 20 // unused
#define GDI_META_TYPE 21
#define GDI_EFSTATE_TYPE 22
#define GDI_BMFD_TYPE 23 // unused
#define GDI_VTFD_TYPE 24 // unused
#define GDI_TTFD_TYPE 25 // unused
#define GDI_RC_TYPE 26 // unused
#define GDI_TEMP_TYPE 27 // unused
#define GDI_DRVOBJ_TYPE 28
#define GDI_DCIOBJ_TYPE 29 // unused
#define GDI_SPOOL_TYPE 30

// GDI client-side types

#define GDI_CLIENT_TYPE_FROM_HANDLE(Handle) ((ULONG)(Handle) & ((GDI_HANDLE_ALTTYPE_MASK << GDI_HANDLE_ALTTYPE_SHIFT) | \
    (GDI_HANDLE_TYPE_MASK << GDI_HANDLE_TYPE_SHIFT)))
#define GDI_CLIENT_TYPE_FROM_UNIQUE(Unique) GDI_CLIENT_TYPE_FROM_HANDLE((ULONG)(Unique) << 16)

#define GDI_ALTTYPE_1 (1 << GDI_HANDLE_ALTTYPE_SHIFT)
#define GDI_ALTTYPE_2 (2 << GDI_HANDLE_ALTTYPE_SHIFT)
#define GDI_ALTTYPE_3 (3 << GDI_HANDLE_ALTTYPE_SHIFT)

#define GDI_CLIENT_BITMAP_TYPE (GDI_SURF_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_BRUSH_TYPE (GDI_BRUSH_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_CLIENTOBJ_TYPE (GDI_CLIENTOBJ_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_DC_TYPE (GDI_DC_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_FONT_TYPE (GDI_LFONT_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_PALETTE_TYPE (GDI_PAL_TYPE << GDI_HANDLE_TYPE_SHIFT)
#define GDI_CLIENT_REGION_TYPE (GDI_RGN_TYPE << GDI_HANDLE_TYPE_SHIFT)

#define GDI_CLIENT_ALTDC_TYPE (GDI_CLIENT_DC_TYPE | GDI_ALTTYPE_1)
#define GDI_CLIENT_DIBSECTION_TYPE (GDI_CLIENT_BITMAP_TYPE | GDI_ALTTYPE_1)
#define GDI_CLIENT_EXTPEN_TYPE (GDI_CLIENT_BRUSH_TYPE | GDI_ALTTYPE_2)
#define GDI_CLIENT_METADC16_TYPE (GDI_CLIENT_CLIENTOBJ_TYPE | GDI_ALTTYPE_3)
#define GDI_CLIENT_METAFILE_TYPE (GDI_CLIENT_CLIENTOBJ_TYPE | GDI_ALTTYPE_2)
#define GDI_CLIENT_METAFILE16_TYPE (GDI_CLIENT_CLIENTOBJ_TYPE | GDI_ALTTYPE_1)
#define GDI_CLIENT_PEN_TYPE (GDI_CLIENT_BRUSH_TYPE | GDI_ALTTYPE_1)

typedef struct _GDI_HANDLE_ENTRY
{
    union
    {
        PVOID Object;
        PVOID NextFree;
    };
    union
    {
        struct
        {
            USHORT ProcessId;
            USHORT Lock : 1;
            USHORT Count : 15;
        };
        ULONG Value;
    } Owner;
    USHORT Unique;
    UCHAR Type;
    UCHAR Flags;
    PVOID UserPointer;
} GDI_HANDLE_ENTRY, *PGDI_HANDLE_ENTRY;

typedef struct _GDI_SHARED_MEMORY
{
    GDI_HANDLE_ENTRY Handles[GDI_MAX_HANDLE_COUNT];
} GDI_SHARED_MEMORY, *PGDI_SHARED_MEMORY;

#endif