DDBLTFX

The DDBLTFX structure passes raster operations, effects, and override information to the IDirectDrawSurface3::Blt method. This structure is also part of the DDBLTBATCH structure used with the IDirectDrawSurface3::BltBatch method.

typedef struct _DDBLTFX{­

DWORD dwSize;

DWORD dwDDFX;

DWORD dwROP;

DWORD dwDDROP;

DWORD dwRotationAngle;

DWORD dwZBufferOpCode;

DWORD dwZBufferLow;

DWORD dwZBufferHigh;

DWORD dwZBufferBaseDest;

DWORD dwZDestConstBitDepth;

union

{­

DWORD dwZDestConst;

LPDIRECTDRAWSURFACE lpDDSZBufferDest;

};

DWORD dwZSrcConstBitDepth;

union

{­

DWORD dwZSrcConst;

LPDIRECTDRAWSURFACE lpDDSZBufferSrc;

};

DWORD dwAlphaEdgeBlendBitDepth;

DWORD dwAlphaEdgeBlend;

DWORD dwReserved;

DWORD dwAlphaDestConstBitDepth;

union

{­

DWORD dwAlphaDestConst;

LPDIRECTDRAWSURFACE lpDDSAlphaDest;

};

DWORD dwAlphaSrcConstBitDepth;

union

{­

DWORD dwAlphaSrcConst;

LPDIRECTDRAWSURFACE lpDDSAlphaSrc;

};

union

{­

DWORD dwFillColor;

DWORD dwFillDepth;

DWORD dwFillPixel;

LPDIRECTDRAWSURFACE lpDDSPattern;

};

DDCOLORKEY ddckDestColorkey;

DDCOLORKEY ddckSrcColorkey;

} DDBLTFX,FAR* LPDDBLTFX;

Members

dwSize

Size of the structure, in bytes. This member must be initialized before the structure is used.

dwDDFX

Type of FX operations.

DDBLTFX_ARITHSTRETCHY
	Uses arithmetic stretching along the y-axis for this blit.
DDBLTFX_MIRRORLEFTRIGHT
	Turns the surface on its y-axis. This blit mirrors the surface from left to right.
DDBLTFX_MIRRORUPDOWN
	Turns the surface on its x-axis. This blit mirrors the surface from top to bottom.
DDBLTFX_NOTEARING
	Schedules this blit to avoid tearing.
DDBLTFX_ROTATE180
	Rotates the surface 180 degrees clockwise during this blit.
DDBLTFX_ROTATE270
	Rotates the surface 270 degrees clockwise during this blit.
DDBLTFX_ROTATE90
	Rotates the surface 90 degrees clockwise during this blit.
DDBLTFX_ZBUFFERBASEDEST
	Adds the dwZBufferBaseDest member to each of the source z-values before comparing them with the destination z-values during this z-blit.
DDBLTFX_ZBUFFERRANGE
	Uses the dwZBufferLow and dwZBufferHigh members as range values to specify limits to the bits copied from a source surface during this z-blit.

dwROP

Win32 raster operations. You can retrieve a list of supported raster operations by calling the IDirectDraw2::GetCaps method.

dwDDROP

DirectDraw raster operations.

dwRotationAngle

Rotation angle for the blit.

dwZBufferOpCode

Z-buffer compares.

dwZBufferLow

Low limit of a z-buffer.

dwZBufferHigh

High limit of a z-buffer.

dwZBufferBaseDest

Destination base value of a z-buffer.

dwZDestConstBitDepth

Bit depth of the destination z-constant.

dwZDestConst

Constant used as the z-buffer destination.

lpDDSZBufferDest

Surface used as the z-buffer destination.

dwZSrcConstBitDepth

Bit depth of the source z-constant.

dwZSrcConst

Constant used as the z-buffer source.

lpDDSZBufferSrc

Surface used as the z-buffer source.

dwAlphaEdgeBlendBitDepth

Bit depth of the constant for an alpha edge blend.

dwAlphaEdgeBlend

Alpha constant used for edge blending.

dwReserved

Reserved for future use.

dwAlphaDestConstBitDepth

Bit depth of the destination alpha constant.

dwAlphaDestConst

Constant used as the alpha channel destination.

lpDDSAlphaDest

Surface used as the alpha channel destination.

dwAlphaSrcConstBitDepth

Bit depth of the source alpha constant.

dwAlphaSrcConst

Constant used as the alpha channel source.

lpDDSAlphaSrc

Surface used as the alpha channel source.

dwFillColor

Color used to fill a surface when DDBLT_COLORFILL is specified. This value must be a pixel appropriate to the pixel format of the destination surface. For a palettized surface it would be a palette index, and for a 16-bit RGB surface it would be a 16-bit pixel value.

dwFillDepth

Depth value for the z-buffer.

dwFillPixel

Pixel value for RGBA or RGBZ fills. Applications that use RGBZ fills should use this member, not dwFillColor or dwFillDepth.

lpDDSPattern

Surface to use as a pattern. The pattern can be used in certain blit operations that combine a source and a destination.

ddckDestColorkey

Destination color key override.

ddckSrcColorkey

Source color key override.