Pointer to information needed by the graphics engine that represents the device's physical surface.

typedef struct _DEVICESURFACE {
  ULONG            ulLength;                                                        /*  Length of the DEVICESURFACE data structure. */
  BMAPINFO         SurfaceBmapInfo;                                                 /*  Information for rastering to a linear address. */
  ULONG            ulDSFlgs;                                                        /*  Flags for rendering of rasterized data. */
  ULONG            ulStyleRatio;                                                    /*  Default style ratio used by the current device. */
  BMAPINFO         abmapinfoDefPattern[DEFAULT_PATTERNS_NUMBER];  /*  Set of default patterns. */
  PVOID            pHWPalette;                                                      /*  Default hardware palette for the current device. */
  DITHERMATRIX     DitherMatrix;                                                    /*  Default to generic dither support. */
  PFN              pfnDevLockDC;                                                    /*  Default pointer to device-specific information. */
  PFN              pfnDevUnLockDC;                                                  /*  Default pointer to release DC lock. */
  PFN              pfnBitBlt;                                                       /*  Pointer defaults to SOFTDRAW's handling of the SDBitBlt function. */
  PFN              pfnLine;                                                         /*  Pointer defaults to SOFTDRAW's handling of the SDLINE function. */
  PFN              pfnReserved;                                                     /*  Reserved by system. */
  PFN              pfnLockPhysDev;                                                  /*  Prevents access to physical device. */
  PFN              pfnUnLockPhysDev;                                                /*  Releases the physical device. */
  ULONG            ulReserved[5];                                 /*  Reserved by system. */
  ULONG            ulCapsCnt;                                                       /*  Size in ULONGs of the DevCaps field. */
  ULONG            DevCaps[CAPS_MAX_CAPS + 1];               /*  The device capabilities array in OS/2 2.0 and prev
ious versions. */
} DEVICESURFACE;

typedef   DEVICESURFACE   * PDEVICESURFACE ;