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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| gdi32.lib
| Header File
| wingdi.h
| Unicode
| No
| Platform Notes
| Windows 95: 16-bit coordinates only
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ExtSelectClipRgn
The ExtSelectClipRgn function combines the specified region with the current clipping region by
using the specified mode.
int ExtSelectClipRgn(
HDC hdc,
| // handle to device context
| HRGN hrgn,
| // handle to region
| int fnMode
| // region-selection mode
| );
|
|
Parameters
hdc
Identifies the device context.
hrgn
Identifies the region to be selected. This handle can only be NULL when the
RGN_COPY mode is specified.
fnMode
Specifies the operation to be performed. It must be one of the following
values:
Value
| Meaning
| RGN_AND
| The new clipping region combines the overlapping areas of the current clipping
region and the region identified by hrgn.
| RGN_COPY
| The new clipping region is a copy of the region identified by hrgn. This is identical to SelectClipRgn. If the region identified by hrgn is NULL, the new clipping region is the default clipping region (the default
clipping region is a null region).
| RGN_DIFF
| The new clipping region combines the areas of the current clipping region with
those areas excluded from the region identified by hrgn.
| RGN_OR
| The new clipping region combines the current clipping region and the region
identified by hrgn.
| RGN_XOR
| The new clipping region combines the current clipping region and the region
identified by hrgn but excludes any overlapping areas.
|
Return Values
If the function succeeds, the return value specifies the new clipping region's
complexity and can be any one of the following values:
Value
| Meaning
| NULLREGION
| Region is empty.
| SIMPLEREGION
| Region is a single rectangle.
| COMPLEXREGION
| Region is more than one rectangle.
| ERROR
| An error occurred.
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Remarks
If an error occurs when this function is called, the previous clipping region
for the specified device context is not affected.
The ExtSelectClipRgn function assumes that the coordinates for the specified region are specified
in device units.
Only a copy of the region identified by the hrgn parameter is used. The region itself can be reused after this call or it can
be deleted.
See Also
SelectClipRgn
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