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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| gdi32.lib
| Header File
| wingdi.h
| Unicode
| No
| Platform Notes
| Windows 95: int == 16 bits
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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
| );
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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
GetDeviceCaps, RealizePalette
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