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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| gdi32.lib
| Header File
| wingdi.h
| Unicode
| No
| Platform Notes
| Windows 95: 16-bit coordinates only
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MaskBlt
The MaskBlt function combines the color data for the source and destination bitmaps using
the specified mask and raster operation.
BOOL MaskBlt(
HDC hdcDest,
| // handle of destination device context
| int nXDest,
| // x-coord. of upper-left corner of destination rectangle
| int nYDest,
| // y-coord. of upper-left corner of destination rectangle
| int nWidth,
| // width of source and destination rectangles
| int nHeight,
| // height of source and destination rectangles
| HDC hdcSrc,
| // handle of source device context
| int nXSrc,
| // x-coord. of upper-left corner of source rectangle
| int nYSrc,
| // y-coord. of upper-left corner of source rectangle
| HBITMAP hbmMask,
| // handle of monochrome bit mask
| int xMask,
| // horizontal pixel offset into the mask bitmap
| int yMask,
| // vertical pixel offset into the mask bitmap
| DWORD dwRop
| // raster operation code
| );
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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 width, in logical units, of the destination rectangle and source
bitmap.
nHeight
Specifies the height, in logical units, of the destination rectangle and
source bitmap.
hdcSrc
Identifies the device context from which the bitmap is to be copied. It must
be zero if the dwRop parameter specifies a raster operation that does not include a source.
nXSrc
Specifies the logical x-coordinate of the upper-left corner of the source
bitmap.
nYSrc
Specifies the logical y-coordinate of the upper-left corner of the source
bitmap.
hbmMask
Identifies the monochrome mask bitmap combined with the color bitmap in the
source device context.
xMask
Specifies the horizontal pixel offset for the mask bitmap specified by the hbmMask parameter.
yMask
Specifies the vertical pixel offset for the mask bitmap specified by the hbmMask parameter.
dwRop
Specifies both foreground and background ternary raster operation codes that
the function uses to control the combination of source and destination data. The
background raster operation code is stored in the high-order byte of the
high-order word of this value; the foreground raster operation code is stored in the
low-order byte of the high-order word of this value; the low-order word of
this value is ignored, and should be zero. The macro MAKEROP4 creates such combinations of foreground and background raster operation
codes.
For a discussion of foreground and background in the context of this function,
see the following Remarks section.
For a list of common raster operation codes, see the BitBlt function.
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
A value of 1 in the mask specified by hbmMask indicates that the foreground raster operation code specified by dwRop should be applied at that location. A value of 0 in the mask indicates that
the background raster operation code specified by dwRop should be applied at that location.
If the raster operations require a source, the mask rectangle must cover the
source rectangle. If it does not, the function will fail. If the raster
operations do not require a source, the mask rectangle must cover the destination
rectangle. If it does not, the function will fail.
If a rotation or shear transformation is in effect for the source device
context when this function is called, an error occurs. However, other types of
transformation are allowed.
If the color formats of the source, pattern, and destination bitmaps differ,
this function converts the pattern or source format, or both, to match the
destination format.
If the mask bitmap is not a monochrome bitmap, an error occurs.
When an enhanced metafile is being recorded, an error occurs (and the function
returns FALSE) if the source device context identifies an enhanced-metafile
device context.
Not all devices support the MaskBlt function. An application should call the GetDeviceCaps function to determine whether a device supports this function.
If no mask bitmap is supplied, this function behaves exactly like BitBlt, using the foreground raster operation code.
The pixel offsets in the mask bitmap map to the point (0,0) in the source
device context's bitmap. This is useful in cases where a mask bitmap contains a set
of masks; an application can easily apply any one of them to a mask-block
transfer task by adjusting the pixel offsets and rectangle sizes sent to MaskBlt.
See Also
BitBlt, GetDeviceCaps, PlgBlt, StretchBlt
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