GreDeviceAnimatePalette

GreDeviceAnimatePalette is the presentation driver version of GreAnimatePalette. It is called to process an application's GreAnimatePalette request. The purpose of this function is to modify the RGB values in the hardware palette rapidly and make the changes apparent immediately. Changes are reflected immediately for each logical palette entry that is marked as PC-RESERVED and is associated with a hardware slot. The RGB value on the logical application's palette, as well as the hardware palette itself, are updated.

This function can be hooked by the presentation driver.


 * Simulation support: This function is simulated by a handling routine in Revision 2.0 (or higher) of the graphics engine.

Syntax
GreDeviceAnimatePalette(hdc, hdevpal, ulFormat, ulStart, cclr, pclr, pInstance, lFunction);

Parameters

 * hdc (HDC) - input
 * Device context handle.


 * hdevpal (ULONG) - input
 * Device palette handle.


 * ulFormat (ULONG) - input
 * Specifies the entry format. Must be LCOLF_CONSECRGB.


 * ulStart (ULONG) - input
 * Starting index, that is, the first palette entry to change.


 * cclr (ULONG) - input
 * Count of the palette entries to change.


 * pclr (PULONG) - input
 * Pointer to table of new RGB2 palette entries.


 * pInstance (PVOID) - input
 * Pointer to instance data.


 * lFunction (ULONG) - input
 * High-order WORD=flags; low-order WORD=NGreDeviceAnimatePalette.

Returns

 * rc (ULONG) - returns
 * Return codes.


 * PAL-ERROR Error Count of the hardware palette slots changed.


 * Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:


 * PMERR_PALETTE_BUSY
 * PMERR_INV_IN_AREA
 * PMERR_INV_IN_PATH.

Sample

 * 1) define INCL_GRE_PALETTE
 * 2) include 

HDC      hdc;        /*  Device context handle. */ ULONG    hdevpal;    /*  Device palette handle. */ ULONG    ulFormat;   /*  Specifies the entry format. Must be LCOLF_CONSECRGB. */ ULONG    ulStart;    /*  Starting index, that is, the first palette entry to change. */ ULONG    cclr;       /*  Count of the palette entries to change. */ PULONG   pclr;       /*  Pointer to table of new RGB2 palette entries. */ PVOID    pInstance;  /*  Pointer to instance data. */ ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreDeviceAnimatePalette. */ ULONG    rc;         /*  Return codes. */

rc = GreDeviceAnimatePalette(hdc, hdevpal,      ulFormat, ulStart, cclr, pclr, pInstance,       lFunction);

Remarks
This function modifies the colors in a palette. Changes are reflected immediately for each animated index that has a hardware slot.