Information pertaining to PutImage and GetImage.

typedef struct _IMAGEPACK {
  ULONG         ulLength;    /*  Length of IMAGEPACK data structure, in bytes. */
  ULONG         ulFlags;     /*  Image pack flag. */
  ULONG         ulHandle;    /*  Unique ID returned by VRAMREGISTEROUT. */
  ULONG         ulID;        /*  Unique buffer ID. */
  ULONG         ulCmdMask;   /*  Specific changes since the last frame. */
  PIMAGEBUF     pPutBuf;     /*  Used as source image in PutImage command. */
  PIMAGEBUF     pGetBuf;     /*  Used as destination image in GetImage command. */
  POINTL        ptlDstOrg;   /*  Destination origin (origin at upper left). */
  ULONG         ulDstXext;   /*  Destination X extent. */
  ULONG         ulDstYext;   /*  Destination Y extent. */
  POINTL        ptlSrcOrg;   /*  Offset into the source image. */
  ULONG         ulSrcXext;   /*  Source X extent. */
  ULONG         ulSrcYext;   /*  Source Y extent. */
  ULONG         cVisRects;   /*  Number of output visible rectangles. */
  PRECTL        prctlVis;    /*  Pointer to array of visible regions. */
  POINTL        ptlWBOrg;    /*  Origin of off-screen VRAM work buffer. */
  ULONG         cWBBytes;    /*  Number of bytes in the work buffer. */
  PBYTE         pVirtVRAM;   /*  A 32-bit virtual pointer to the start of VRAM. */
  ULONG         ulGrafXPar;  /*  Transparent color for overlay type devices. */
} IMAGEPACK;

typedef   IMAGEPACK   * PIMAGEPACK ;