## Presentation Device Driver Reference for OS/2

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### GreUpdateColors - Syntax

Simulation support:

This function is simulated by a handling routine in Revision 2.0 (or later) of the graphics engine.

Description

GreUpdateColors causes a pel-by-pel remapping of the Device Context's visible area on the screen.

This function can be hooked by the presentation driver.

    #define INCL_GRE_PALETTE

    #include <os2.h>

    HDC      hdc;        /*  Device context handle. */

    PVOID    pInstance;  /*  Pointer to instance data. */

    ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreUpdateColor. */

    BOOL     rc;         /*  Return codes. */

    rc = GreUpdateColors(hdc, pInstance, lFunction);