UpdateColors
The UpdateColors
function updates the client area of the specified device context by remapping
the current colors in the client area to the currently realized logical
palette.
BOOL UpdateColors(
|
HDC hdc |
// handle of device
context |
|
); |
|
Parameters
hdc
Identifies
the device context.
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
An
application can determine whether a device supports palette operations by
calling the GetDeviceCaps
function and specifying the RASTERCAPS constant.
An inactive
window with a realized logical palette may call UpdateColors as an
alternative to redrawing its client area when the system palette changes.
The UpdateColors
function typically updates a client area faster than redrawing the area.
However, because UpdateColors performs the color translation based on
the color of each pixel before the system palette changed, each call to this
function results in the loss of some color accuracy.
This function
must be called soon after a WM_PALETTECHANGED message is received.
See Also