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BitBlt info  Overview  Group

The BitBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

BOOL BitBlt(

    HDC hdcDest,

// handle to destination device context

    int nXDest,

// x-coordinate of destination rectangle’s upper-left corner

    int nYDest,

// y-coordinate of destination rectangle’s upper-left corner

    int nWidth,

// width of destination rectangle

    int nHeight,

// height of destination rectangle

    HDC hdcSrc,

// handle to source device context

    int nXSrc,

// x-coordinate of source rectangle’s upper-left corner

    int nYSrc,

// y-coordinate of source rectangle’s upper-left corner

    DWORD dwRop 

// raster operation code

   );

Parameters

hdcDest
Identifies the destination device context.
nXDest
Specifies the logical x-coordinate of the upper-left corner of the destination rectangle.
nYDest
Specifies the logical y-coordinate of the upper-left corner of the destination rectangle.
nWidth
Specifies the logical width of the source and destination rectangles.
nHeight
Specifies the logical height of the source and the destination rectangles.
hdcSrc
Identifies the source device context.
nXSrc
Specifies the logical x-coordinate of the upper-left corner of the source rectangle.
nYSrc
Specifies the logical y-coordinate of the upper-left corner of the source rectangle.
dwRop
Specifies a raster-operation code. These codes define how the color data for the source rectangle is to be combined with the color data for the destination rectangle to achieve the final color.

The following list shows some common raster operation codes:

Value

Description

BLACKNESS

Fills the destination rectangle using the color associated with index 0 in the physical palette. (This color is black for the default physical palette.)

DSTINVERT

Inverts the destination rectangle.

MERGECOPY

Merges the colors of the source rectangle with the specified pattern by using the Boolean AND operator.

MERGEPAINT

Merges the colors of the inverted source rectangle with the colors of the destination rectangle by using the Boolean OR operator.

NOTSRCCOPY

Copies the inverted source rectangle to the destination.

NOTSRCERASE

Combines the colors of the source and destination rectangles by using the Boolean OR operator and then inverts the resultant color.

PATCOPY

Copies the specified pattern into the destination bitmap.

PATINVERT

Combines the colors of the specified pattern with the colors of the destination rectangle by using the Boolean XOR operator.

PATPAINT

Combines the colors of the pattern with the colors of the inverted source rectangle by using the Boolean OR operator. The result of this operation is combined with the colors of the destination rectangle by using the Boolean OR operator.

SRCAND

Combines the colors of the source and destination rectangles by using the Boolean AND operator.

SRCCOPY

Copies the source rectangle directly to the destination rectangle.

SRCERASE

Combines the inverted colors of the destination rectangle with the colors of the source rectangle by using the Boolean AND operator.

SRCINVERT

Combines the colors of the source and destination rectangles by using the Boolean XOR operator.

SRCPAINT

Combines the colors of the source and destination rectangles by using the Boolean OR operator.

WHITENESS

Fills the destination rectangle using the color associated with index 1 in the physical palette. (This color is white for the default physical palette.)

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

If a rotation or shear transformation is in effect in the source device context, BitBlt returns an error. If other transformations exist in the source device context (and a matching transformation is not in effect in the destination device context), the rectangle in the destination device context is stretched, compressed, or rotated as necessary.

If the color formats of the source and destination device contexts do not match, the BitBlt function converts the source color format to match the destination format.

When an enhanced metafile is being recorded, an error occurs if the source device context identifies an enhanced-metafile device context.

Not all devices support the BitBlt function. For more information, see the RC_BITBLT raster capability entry in GetDeviceCaps.

BitBlt returns an error if the source and destination device contexts represent different devices.

See Also

GetDeviceCaps, MaskBlt, PlgBlt, StretchBlt

See also:


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