/***************************************************************************
 *   Copyright (C) 2004 by Christoph Freundl                               *
 *   Christoph.Freundl@informatik.uni-erlangen.de                          *
 *                                                                         *
 *   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 SDLWIDGETS_GRAPHICS_H
#define SDLWIDGETS_GRAPHICS_H

#include <SDL.h>

namespace SDLwidgets {

class Graphics {
public:
	static void putPixel( SDL_Surface* surface, int x, int y,
	                      Uint32 pixelValue ) {
		/* Copied from the SDL manual */
		int bpp = surface->format->BytesPerPixel;
		/* Here p is the address to the pixel we want to set */
		Uint8* p = static_cast<Uint8*>( surface->pixels )
			+ y * surface->pitch + x * bpp;
		
		switch ( bpp ) {
		case 1:
			*p = pixelValue;
			break;
		
		case 2:
			*( reinterpret_cast<Uint16*>( p ) ) = pixelValue;
			break;
		
		case 3:
			if( SDL_BYTEORDER == SDL_BIG_ENDIAN ) {
				p[0] = ( pixelValue >> 16 ) & 0xff;
				p[1] = ( pixelValue >> 8 ) & 0xff;
				p[2] = pixelValue & 0xff;
			} else {
				p[0] = pixelValue & 0xff;
				p[1] = ( pixelValue >> 8) & 0xff;
				p[2] = ( pixelValue >> 16) & 0xff;
			}
			break;
		
		case 4:
			*( reinterpret_cast<Uint32 *>( p ) ) = pixelValue;
			break;
		}
	}
	static void putPixel( SDL_Surface* surface, int x, int y,
	                      const SDL_Color* color ) {
		Uint32 pixelValue =
			SDL_MapRGB( surface->format, color->r, color->g, color->b );
		putPixel( surface, x, y, pixelValue );
	}
	static void drawLine( SDL_Surface* surface, int x0, int y0, int x1, int y1,
	                      const SDL_Color* color );
	static void fillRectAlpha( SDL_Surface* surface, SDL_Rect* rect,
	                           SDL_Color color, Uint8 alpha );
};

}

#endif // SDLWIDGETS_GRAPHICS_H