scpalette.cpp

Source code for EMFexplorer 1.0

/*
*	This file is part of the EMFexplorer projet.
*	Copyright (C) 2004 Smith Charles.
*
*	This library is free software; you can redistribute it and/or
*	modify it under the terms of the GNU Lesser General Public
*	License as published by the Free Software Foundation; either
*	version 2.1 of the License, or (at your option) any later version.
*
*   This library is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
*   Lesser General Public License for more details.
*
*   You should have received a copy of the GNU Lesser General Public
*   License along with this library; if not, write to the Free Software
*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
*
*	Extension: for commercial use, apply the Equity Public License, which
*	adds to the normal terms of the GLPL a condition of donation to the author.
*   If you are interested in support for this source code,
*   contact Smith Charles <[e-mail]> for more information.
*/


#include "stdafx.h"
#include "SCPalette.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

// Create a copy of the current system palette.
HPALETTE SCGetSystemPalette()
{
	HDC hDC;
	HPALETTE hPal;
	LPLOGPALETTE lpLogPal;
	
	// Get a DC for the desktop.
	hDC = GetDC(NULL);
	
	// Check to see if you are a running in a palette-based video mode.
	if (!(GetDeviceCaps(hDC, RASTERCAPS) & RC_PALETTE))
	{
		ReleaseDC(NULL, hDC);
		return NULL;
	}
	
	// Allocate memory for the palette.
	lpLogPal = (LPLOGPALETTE)GlobalAlloc(GPTR, sizeof(LOGPALETTE) + 256 *
		sizeof(PALETTEENTRY));
	if (!lpLogPal)
	{
		TRACE(_T("SCGetSystemPalette.GlobalAlloc->NULL"));
		return NULL;
	}

	// Initialize.
	lpLogPal->palVersion = 0x300;
	lpLogPal->palNumEntries = 256;
	
	// Copy the current system palette into the logical palette.
	::GetSystemPaletteEntries(hDC, 0, 256,
		(LPPALETTEENTRY)(lpLogPal->palPalEntry));
	
	// Create the palette.
	hPal = CreatePalette(lpLogPal);
	
	// Clean up.
	GlobalFree(lpLogPal);
	ReleaseDC(NULL, hDC);
	
	return hPal;
}

// Create a copy of an enhanced metafile palette.
HPALETTE SCGetEMFPalette(HENHMETAFILE  hEmf)
{
	// Get the number of palette entries
	UINT uEntries = 0;
	uEntries = GetEnhMetaFilePaletteEntries(hEmf, 0, NULL);
	if (!uEntries)
		return NULL;
	
	// Create the logical palette based on the entries
	// Allocate memory for the palette.
	LPLOGPALETTE lpLogPal;
	lpLogPal = (LPLOGPALETTE)GlobalAlloc(GPTR, sizeof(LOGPALETTE) + uEntries *
		sizeof(PALETTEENTRY));
	if (!lpLogPal)
		return NULL;
	
	// Initialize.
	lpLogPal->palVersion = 0x300;
	lpLogPal->palNumEntries = uEntries;
	
	// Copy the EMF palette into the logical palette.
	if (GetEnhMetaFilePaletteEntries(hEmf, uEntries, (LPPALETTEENTRY)(lpLogPal->palPalEntry))==GDI_ERROR)
		return NULL;
	
	// Create the palette.
	HPALETTE hPal = CreatePalette(lpLogPal);
	
	// Clean up.
	GlobalFree(lpLogPal);
	
	return hPal;
}