DD_SURFACE_GLOBAL

typedef struct _DD_SURFACE_GLOBAL{
    DWORD                dwBlockSizeY;
    union {
        DWORD            dwBlockSizeX;
        DWORD            dwUserMemSize;
    };
    FLATPTR              fpVidMem;
    LONG                 lPitch;
    LONG                 yHint;
    LONG                 xHint;
    DWORD                wHeight;
    DWORD                wWidth;
    DWORD                dwReserved1;
    DDPIXELFORMAT        ddpfSurface;
} DD_SURFACE_GLOBAL;

The DD_SURFACE_GLOBAL structure contains surface-related data that applies globally to all duplicate surface objects.

Members

dwBlockSizeY

Location in which the driver returns the height, in scanlines, of the off-screen memory block that it wants DirectDraw to allocate. The driver should set this value when it returns DDHAL_PLEASEALLOC_BLOCKSIZE in fpVidMem.

dwBlockSizeX

Location in which the driver returns the size in bytes of the width of the off-screen memory block that it wants DirectDraw to allocate. The driver should set this value when it returns DDHAL_PLEASEALLOC_BLOCKSIZE in fpVidMem.

dwUserMemSize

Location in which the driver returns the size in bytes of the memory block that it wants DirectDraw to allocate in user-mode system memory. The driver should set this value when it returns DDHAL_PLEASEALLOC_USERMEM in fpVidMem.

fpVidMem

If the driver allocates the memory block, it should return the offset into video memory in this field. If the driver wants DirectDraw to do the memory allocation, it can instead return one of the following values in this field from its CreateSurface routine:

Value	Meaning
DDHAL_PLEASEALLOC_BLOCKSIZE	Driver wants DirectDraw to allocate a memory block of size dwBlockSizeX in off-screen memory.
DDHAL_PLEASEALLOC_USERMEM	Driver wants DirectDraw to allocate a memory block of size dwBlockSizeX in user-mode memory.

lPitch

Specifies the pitch of the surface; that is, the distance to the start of the next line. This is also known as the stride of the surface.

yHint

Specifies the y-coordinate of the surface. This field is a 2D Cartesian coordinate specified in device space.

xHint

Specifies the x-coordinate of the surface. This field is a 2D Cartesian coordinate specified in device space.

wHeight

Specifies the height of the surface.

wWidth

Specifies the width of the surface.

dwReserved1

Reserved for use by the display driver.

ddpfSurface

Pointer to the DDPIXELFORMAT structure that describes the pixel format of the surface.