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/*******************************************************************************
* colour.h
*
* This module contains all defines, typedefs, and prototypes for COLOUR.CPP.
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/source/backend/colour/colour.h $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
/* NOTE: FRAME.H contains other colour stuff. */
#ifndef COLOUR_H
#define COLOUR_H
namespace pov
{
/*****************************************************************************
* Global preprocessor defines
******************************************************************************/
#define RED2GRAY 0.297
#define GREEN2GRAY 0.589
#define BLUE2GRAY 0.114
#define GREY_SCALE3(CR,CG,CB) (RED2GRAY*(CR) + GREEN2GRAY*(CG) + BLUE2GRAY*(CB))
#define GREY_SCALE(C) GREY_SCALE3((C)[pRED],(C)[pGREEN],(C)[pBLUE])
/*****************************************************************************
* Global typedefs
******************************************************************************/
/*****************************************************************************
* Global variables
******************************************************************************/
/*****************************************************************************
* Global functions
******************************************************************************/
COLOUR *Create_Colour (void);
COLOUR *Copy_Colour (const COLOUR Old);
BLEND_MAP_ENTRY *Create_BMap_Entries (int Map_Size);
BLEND_MAP_ENTRY *Copy_BMap_Entries (const BLEND_MAP_ENTRY *Old, int Map_Size, int Type);
BLEND_MAP *Create_Blend_Map (void);
BLEND_MAP *Copy_Blend_Map (BLEND_MAP *Old);
DBL Colour_Distance_RGBT (const Colour& colour1, const Colour& colour2);
void Destroy_Blend_Map (BLEND_MAP *BMap);
/*****************************************************************************
* Inline functions
******************************************************************************/
}
#endif
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