Performs a bit block transfer (bitblt). This method does not support z-buffering or alpha blending during bitblt operations.
HRESULT Blt( [in] LPRECT lpDestRect, [in] LPDIRECTDRAWSURFACE7 lpDDSrcSurface, [in] LPRECT lpSrcRect, [in] DWORD dwFlags, [in] LPDDBLTFX lpDDBltFx );
- lpDestRect [in]
A pointer to a RECT structure that defines the upper-left and lower-right points of the rectangle to bitblt to on the destination surface. If this parameter is NULL, the entire destination surface is used.
- lpDDSrcSurface [in]
A pointer to the IDirectDrawSurface7 interface for the DirectDrawSurface object that is the source of the bitblt.
- lpSrcRect [in]
A pointer to a RECT structure that defines the upper-left and lower-right points of the rectangle to bitblt from on the source surface. If this parameter is NULL, the entire source surface is used.
- dwFlags [in]
A combination of flags that determine the valid members of the associated DDBLTFX structure, specify color-key information, or request special behavior from the method. The following flags are defined:
Uses the dwFillColor member of the DDBLTFX structure as the RGB color that fills the destination rectangle on the destination surface.
Uses the dwDDFX member of the DDBLTFX structure to specify the effects to use for this bitblt.
Uses the dwDDROP member of the DDBLTFX structure to specify the raster operations (ROPS) that are not part of the Win32 API.
Uses the dwFillDepth member of the DDBLTFX structure as the depth value with which to fill the destination rectangle on the destination z-buffer surface.
Uses the ddckDestColorkey member of the DDBLTFX structure as the color key for the destination surface.
Uses the ddckSrcColorkey member of the DDBLTFX structure as the color key for the source surface.
Uses the dwROP member of the DDBLTFX structure for the ROP for this bitblt. These ROPs are the same as those defined in the Win32 API.
Uses the dwRotationAngle member of the DDBLTFX structure as the rotation angle (specified in 1/100s of a degree) for the surface.
Color key flags
Uses the color key that is associated with the destination surface.
Uses the color key that is associated with the source surface.
Performs this bitblt asynchronously through the first in, first out (FIFO) hardware in the order received. If no room is available in the FIFO hardware, the call fails.
Returns without bitbltting and also returns DDERR_WASSTILLDRAWING if the bitbltter is busy.
Postpones the DDERR_WASSTILLDRAWING return value if the bitbltter is busy, and returns as soon as the bitblt can be set up or another error occurs.
Obsolete and unsupported flags
- lpDDBltFx [in]
A pointer to the DDBLTFX structure for the bitblt.
If the method succeeds, the return value is DD_OK.
If it fails, the method can return one of the following error values:
Blt can perform synchronous or asynchronous bitblts (the latter is the default behavior). These bitblts can occur from display memory to display memory, from display memory to system memory, from system memory to display memory, or from system memory to system memory. The bitblts can be performed by using source color keys and destination color keys. Arbitrary stretching or shrinking is performed if the source and destination rectangles are not the same size.
Typically, Blt returns immediately with an error if the bitbltter is busy and the bitblt could not be set up. Specify the DDBLT_WAIT flag to request a synchronous bitblt. When you include the DDBLT_WAIT flag, Blt waits until the bitblt can be set up or another error occurs before it returns.
RECT structures are defined so that the right and bottom members are exclusive—therefore, right minus left equals the width of the rectangle, not 1 less than the width.