SetDeviceGammaRamp
The SetDeviceGammaRamp
function sets the gamma ramp on direct color display boards.
BOOL SetDeviceGammaRamp(
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HDC hdc, |
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LPVOID lpRamp |
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); |
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Parameters
hdc
Handle to the
device context.
lpRamp
Pointer to a
set of three arrays of 256-byte elements. These arrays are the mapping between
color values in the frame buffer and DAC values. The first array is red, the
next is green, and the final one is blue.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero.
Remarks
Direct color
display modes do not use color look-up tables. The direct color modes are
usually 16-, 24-, or 32-bit. Not all direct color video boards support loadable
gamma ramps. This function succeeds only for those drivers that support
loadable gamma ramps in hardware.
See Also