Palette.h

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/*
Copyright (C) 2003-2004 The Pentagram Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifndef PALETTE_H
#define PALETTE_H

class IDataSource;

namespace Pentagram
{

enum PalTransforms {
        // Normal untransformed palette
        Transform_None          = 0,

        // O[i] = I[r]*0.375 + I[g]*0.5 + I[b]*0.125;
        Transform_Greyscale     = 1,

        // O[r] = 0;
        Transform_NoRed         = 2,

        // O[i] = (I[i] + Grey)*0.25 + 0.1875;
        Transform_RainStorm     = 3,

        // O[r] = (I[r] + Grey)*0.5 + 0.1875;
        // O[g] = I[g]*0.5 + Grey*0.25;
        // O[b] = I[b]*0.5;
        Transform_FireStorm     = 4,

        // O[i] = I[i]*2 -Grey;
        Transform_Saturate      = 5,

        // O[g] = I[r]; O[b] = I[g]; O[r] = I[b];
        Transform_GBR           = 6,

        // O[b] = I[r]; O[r] = I[g]; O[g] = I[b];
        Transform_BRG           = 7
};

struct Palette
{
        void load(IDataSource& ds, IDataSource& xformds);
        void load(IDataSource& ds);

        // 256 rgb entries
        uint8 palette[768];

        // Untransformed native format palette. Created by the RenderSurface
        uint32 native_untransformed[256];

        // Transformed native format palette. Created by the RenderSurface
        uint32 native[256];

        // Untransformed XFORM ARGB palette
        uint32 xform_untransformed[256];

        // Transformed XFORM ARGB palette. Created by the RenderSurface
        uint32 xform[256];

        // Colour transformation matrix (for fades, hue shifts)
        // Applied by the RenderSurface (fixed -4.11)
        // R = R*matrix[0] + G*matrix[1] + B*matrix[2]  + matrix[3];
        // G = R*matrix[4] + G*matrix[5] + B*matrix[6]  + matrix[7];
        // B = R*matrix[8] + G*matrix[9] + B*matrix[10] + matrix[11];
        // A = A;
        sint16 matrix[12];

        // The current palette transform
        PalTransforms transform;
};

}

#endif

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