/*
 * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

#ifndef AWT_PALETTE_H
#define AWT_PALETTE_H

#include "awt_Win32GraphicsDevice.h"

#define CMAPSIZE        256     // number of colors to use in default cmap

#define GS_NOTGRAY      0       // screen is not grayscale
#define GS_INDEXGRAY    1       // screen is 8-bit indexed with several
                                //  gray colormap entries
#define GS_STATICGRAY   2       // screen is 8-bit with 256 gray values
                                // from 0 to 255 (no index table used)
#define GS_NONLINGRAY   3       /* screen is 8-bit with 256 gray values
                                   in non-monotonic order */

class AwtWin32GraphicsDevice;

class AwtPalette {

public:
    HPALETTE                Select(HDC hDC);

    void                    Realize(HDC hDC);

    HPALETTE                GetPalette() { return logicalPalette; }

                            AwtPalette(AwtWin32GraphicsDevice *device);

    static int              FetchPaletteEntries(HDC hDC, PALETTEENTRY* pPalEntries);
    int                     GetGSType(PALETTEENTRY* pPalEntries);

    BOOL                    Update();
    void                    UpdateLogical();

    unsigned int            *GetSystemEntries() {return systemEntries; }
    unsigned int            *GetLogicalEntries() {return logicalEntries; }
    unsigned char           *GetSystemInverseLUT() { return systemInverseLUT; }

private:
    unsigned int            logicalEntries[256];
    unsigned int            systemEntries[256];
    PALETTEENTRY            systemEntriesWin32[256];  // cached to eliminate
                                              // copying it when unnec.
    int                     numSystemEntries;
    HPALETTE                logicalPalette;

    AwtWin32GraphicsDevice  *device;
    unsigned char           *systemInverseLUT;

    /**
     * This custom palette is derived from the IE palette.
     * Previously, we used a custom palette that used a patented
     * algorithm for getting an evently distributed color space.
     * But given the realites of desktop and web graphics, it seems
     * more important to use a more standard palette, especially one
     * that agrees with the predominant browser.  The browser uses
     * a slightly modified 6x6x6 colorcube plus a gray ramp plus a
     * few other colors.  We still flash with Netscape, but we end
     * up using a very similar palette (Netscape uses a 6x6x6 color
     * cube as well); the entries are just in different places (thus
     * the flash).
     * Another possible solution to use a standard palette would be
     * to use the CreateHalftonePalette() call of win32.  This gives
     * us the IE palette on win98, but totally different palettes on
     * different versions of Windows.  We should at least use the same
     * colors on different flavors of the same platform...
     * The values coded below should be used for entries 10 through
     * 245 of our custom palette.  Entries 0-9 and 246-255 should be
     * retrieved from the current system palette, to ensure that we
     * are working well with the current desktop palette.
     *
     * The palette is initialized in awt_CustomPaletteDef.h
     */
    static PALETTEENTRY     customPalette[236];
};



#endif AWT_PALETTE_H