/***************************************************************************
 *   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.             *
 ***************************************************************************/

#include "graphics.h"

namespace SDLwidgets {

void Graphics::drawLine( SDL_Surface* surface, int x0, int y0, int x1, int y1,
                         const SDL_Color* color ) {
	SDL_PixelFormat* format = surface->format;
	Uint32 pixelColor = SDL_MapRGB( format, color->r, color->g, color->b );
	
	// special cases
	if ( x0 == x1 ) {
		for ( int y = y0; y <= y1; y++ ) {
			putPixel( surface, x0, y, pixelColor );
		}
	}
	else if ( y0 == y1 ) {
		for ( int x = x0; x <= x1; x++ ) {
			putPixel( surface, x, y0, pixelColor );
		}
	}
}

void Graphics::fillRectAlpha( SDL_Surface* surface, SDL_Rect* rect,
                              SDL_Color color, Uint8 alpha ) {
	SDL_Surface* rectSurface =
		SDL_CreateRGBSurface( SDL_SWSURFACE | SDL_SRCALPHA,
		                      rect->w, rect->h, surface->format->BitsPerPixel,
		                      surface->format->Rmask, surface->format->Gmask,
		                      surface->format->Bmask, surface->format->Amask );
	Uint32 colorValue =
		SDL_MapRGB( rectSurface->format, color.r, color.g, color.b );
	SDL_FillRect( rectSurface, 0, colorValue );
	SDL_SetAlpha( rectSurface, SDL_SRCALPHA | SDL_RLEACCEL, alpha );
	SDL_BlitSurface( rectSurface, 0, surface, rect );
	SDL_FreeSurface( rectSurface );
}

}