SetBoundsRect function (wingdi.h)
The SetBoundsRect function controls the accumulation of bounding rectangle information for the specified device context. The system can maintain a bounding rectangle for all drawing operations. An application can examine and set this rectangle. The drawing boundaries are useful for invalidating bitmap caches.
UINT SetBoundsRect(
[in] HDC hdc,
[in] const RECT *lprect,
[in] UINT flags
);
[in] hdc
A handle to the device context for which to accumulate bounding rectangles.
[in] lprect
A pointer to a RECT structure used to set the bounding rectangle. Rectangle dimensions are in logical coordinates. This parameter can be NULL.
[in] flags
Specifies how the new rectangle will be combined with the accumulated rectangle. This parameter can be one of more of the following values.
If the function succeeds, the return value specifies the previous state of the bounding rectangle. This state can be a combination of the following values.
Value | Meaning |
---|---|
DCB_DISABLE | Boundary accumulation is off. |
DCB_ENABLE | Boundary accumulation is on. DCB_ENABLE and DCB_DISABLE are mutually exclusive. |
DCB_RESET | Bounding rectangle is empty. |
DCB_SET | Bounding rectangle is not empty. DCB_SET and DCB_RESET are mutually exclusive. |
If the function fails, the return value is zero.
The DCB_SET value is a combination of the bit values DCB_ACCUMULATE and DCB_RESET. Applications that check the DCB_RESET bit to determine whether the bounding rectangle is empty must also check the DCB_ACCUMULATE bit. The bounding rectangle is empty only if the DCB_RESET bit is 1 and the DCB_ACCUMULATE bit is 0.
Requirement | Value |
---|---|
Minimum supported client | Windows 2000 Professional [desktop apps only] |
Minimum supported server | Windows 2000 Server [desktop apps only] |
Target Platform | Windows |
Header | wingdi.h (include Windows.h) |
Library | Gdi32.lib |
DLL | Gdi32.dll |