GetDeviceGammaRamp

Overview

Group

Quick Info

Windows NT
No
Win95
Yes
Win32s
No
Import Library
gdi32.lib
Header File
wingdi.h
Unicode
No
Platform Notes
None

The GetDeviceGammaRamp function retrieves the gamma ramp on direct color display boards.

BOOL GetDeviceGammaRamp(

HDC hdc,
LPVOID lpRamp
);

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 lookup 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.