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100 lines
2.9 KiB
100 lines
2.9 KiB
/******************************Module*Header*******************************\
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* Module Name: palddi.cxx
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*
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* provides driver callbacks for palette management.
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*
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* Created: 06-Dec-1990 11:16:58
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* Author: Patrick Haluptzok patrickh
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*
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* Copyright (c) 1990 Microsoft Corporation
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\**************************************************************************/
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#include "precomp.hxx"
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/******************************Public*Routine******************************\
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* EngCreatePalette
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*
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* This is the engine entry point for device drivers to create palettes.
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*
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* History:
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* 05-Feb-1991 -by- Patrick Haluptzok patrickh
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* Wrote it.
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\**************************************************************************/
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HPALETTE EngCreatePalette(
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ULONG iMode,
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ULONG cColors,
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PULONG pulColors,
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FLONG flRed,
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FLONG flGre,
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FLONG flBlu)
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{
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HPALETTE hpal = (HPALETTE) 0;
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PALMEMOBJ pal;
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// If PAL_BITFIELDS, check to see if we can substitute one of the
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// special cases PAL_RGB or PAL_BGR.
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if ( (iMode == PAL_BITFIELDS) && (flGre == 0x0000ff00) &&
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( ((flRed == 0x000000ff) && (flBlu == 0x00ff0000)) ||
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((flRed == 0x00ff0000) && (flBlu == 0x000000ff)) ) )
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{
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iMode = (flRed == 0x000000ff) ? PAL_RGB : PAL_BGR;
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}
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// We default to assuming it's fixed palette and then at EngAssociate
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// time we look at his pdev and decide if this guy is more capable
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// than that and set the palette up accordingly.
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if (pal.bCreatePalette(iMode, cColors, pulColors,
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flRed, flGre, flBlu, PAL_FIXED))
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{
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pal.vKeepIt();
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hpal = (HPALETTE)pal.hpal();
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pal.ppalSet(NULL); // Leave a reference count of 1 so that we
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// can do vUnrefPalette() in EngDeletePalette
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}
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return(hpal);
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}
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/******************************Public*Routine******************************\
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* EngDeletePalette
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*
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* Driver entry point for deleting palettes it has created
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*
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* History:
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* 05-Feb-1991 -by- Patrick Haluptzok patrickh
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* Wrote it.
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\**************************************************************************/
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BOOL EngDeletePalette(HPALETTE hpal)
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{
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BOOL b = FALSE;
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EPALOBJ palobj(hpal);
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if (palobj.bValid())
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{
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// First, undo the alt-lock we just did by invoking EPALOBJ:
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DEC_SHARE_REF_CNT(palobj.ppalGet());
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// Device dependent bitmaps for RGB colour depths have their palettes
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// pointing to the surface's primary palette. With dynamic colour
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// depth changing, we want to keep those palette references around
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// even after the primary surface is deleted.
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//
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// This means that during the dynamic mode change, the palette should
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// not be deleted when the old instance of the driver asks it to be
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// deleted, but instead when the last bitmap referencing the palette
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// is deleted. Having everyone use 'vUnrefPalette' makes this Just
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// Work.
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palobj.vUnrefPalette();
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b = TRUE;
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}
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return(b);
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}
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