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(
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HDC hdcDest, |
// handle to destination device context |
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int nXDest, |
// x-coordinate of destination rectangle’s upper-left corner |
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int nYDest, |
// y-coordinate of destination rectangle’s upper-left corner |
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int nWidth, |
// width of destination rectangle |
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int nHeight, |
// height of destination rectangle |
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HDC hdcSrc, |
// handle to source device context |
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int nXSrc, |
// x-coordinate of source rectangle’s upper-left corner |
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int nYSrc, |
// y-coordinate of source rectangle’s upper-left corner |
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DWORD dwRop |
// raster operation code |
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); |
The following list shows some common raster operation codes:
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Value |
Description |
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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.) |
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DSTINVERT |
Inverts the destination rectangle. |
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MERGECOPY |
Merges the colors of the source rectangle with the specified pattern by using the Boolean AND operator. |
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MERGEPAINT |
Merges the colors of the inverted source rectangle with the colors of the destination rectangle by using the Boolean OR operator. |
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NOTSRCCOPY |
Copies the inverted source rectangle to the destination. |
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NOTSRCERASE |
Combines the colors of the source and destination rectangles by using the Boolean OR operator and then inverts the resultant color. |
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PATCOPY |
Copies the specified pattern into the destination bitmap. |
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PATINVERT |
Combines the colors of the specified pattern with the colors of the destination rectangle by using the Boolean XOR operator. |
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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. |
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SRCAND |
Combines the colors of the source and destination rectangles by using the Boolean AND operator. |
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SRCCOPY |
Copies the source rectangle directly to the destination rectangle. |
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SRCERASE |
Combines the inverted colors of the destination rectangle with the colors of the source rectangle by using the Boolean AND operator. |
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SRCINVERT |
Combines the colors of the source and destination rectangles by using the Boolean XOR operator. |
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SRCPAINT |
Combines the colors of the source and destination rectangles by using the Boolean OR operator. |
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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.) |
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.
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.