/***************************************************************************
 *   Copyright (c) 2017-2019 by the fifechan team                               *
 *   https://github.com/fifengine/fifechan                                 *
 *   This file is part of fifechan.                                        *
 *                                                                         *
 *   fifechan is free software; you can redistribute it and/or             *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
 *
 *
 * Per Larsson a.k.a finalman
 * Olof Naessén a.k.a jansem/yakslem
 *
 * Visit: http://guichan.sourceforge.net
 *
 * License: (BSD)
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Guichan nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * For comments regarding functions please see the header file.
 */

#include "fifechan/sdl/sdlimage.hpp"

#include "fifechan/exception.hpp"
#include "fifechan/sdl/sdlimageloader.hpp"
#include "fifechan/sdl/sdlpixel.hpp"

namespace fcn
{
	SDLImage::SDLImage(SDL_Surface* surface, bool autoFree)
	{
		mAutoFree = autoFree;
		mSurface = surface;
	}

	SDLImage::~SDLImage()
	{
		if (mAutoFree)
		{
			free();
		}
	}

	SDL_Surface* SDLImage::getSurface() const
	{
		return mSurface;
	}

	int SDLImage::getWidth() const
	{
		if (mSurface == NULL)
		{
			throw FCN_EXCEPTION("Trying to get the width of a non loaded image.");
		}

		return mSurface->w;
	}

	int SDLImage::getHeight() const
	{
		if (mSurface == NULL)
		{
			throw FCN_EXCEPTION("Trying to get the height of a non loaded image.");
		}

		return mSurface->h;
	}

	Color SDLImage::getPixel(int x, int y)
	{
		if (mSurface == NULL)
		{
			throw FCN_EXCEPTION("Trying to get a pixel from a non loaded image.");
		}

		return SDLgetPixel(mSurface, x, y);
	}

	void SDLImage::putPixel(int x, int y, const Color& color)
	{
		if (mSurface == NULL)
		{
			throw FCN_EXCEPTION("Trying to put a pixel in a non loaded image.");
		}

		SDLputPixel(mSurface, x, y, color);
	}

	void SDLImage::convertToDisplayFormat() {
		if (mSurface == NULL) {
			throw FCN_EXCEPTION("Trying to convert a non loaded image to display format.");
		}

		SDLImageLoader* loader = static_cast<SDLImageLoader*>(mImageLoader);
		const SDL_PixelFormat& format = loader->getSDLPixelFormat();

		int i;
		bool hasPink = false;
		bool hasAlpha = false;

		for (i = 0; i < mSurface->w * mSurface->h; ++i) {
			if (((unsigned int*)mSurface->pixels)[i] == SDL_MapRGB(mSurface->format,255,0,255))
			{
				hasPink = true;
				break;
			}
		}

		for (i = 0; i < mSurface->w * mSurface->h; ++i) {
			Uint8 r, g, b, a;

			SDL_GetRGBA(((unsigned int*)mSurface->pixels)[i], mSurface->format,
						&r, &g, &b, &a);

			if (a != 255)
			{
				hasAlpha = true;
				break;
			}
		}

		SDL_Surface* tmp = SDL_ConvertSurface(mSurface, &format, 0);
		SDL_FreeSurface(mSurface);
		mSurface = NULL;

		if (tmp == NULL) {
			throw FCN_EXCEPTION("Unable to convert image to display format.");
		}

		if (hasPink) {
			SDL_SetColorKey(tmp, SDL_TRUE, SDL_MapRGB(tmp->format,255,0,255));
		}
		if (hasAlpha) {
			// I'm not sure about this, maybe we should change
			// SDL_SetSurfaceBlendMode() instead e.g. to disable alpha blending
			// if hasAlpha is false.

			//SDL_SetAlpha(tmp, SDL_SRCALPHA, 255);
			SDL_SetSurfaceAlphaMod(tmp, 255);
		}

		mSurface = tmp;
	}

	void SDLImage::free()
	{
		SDL_FreeSurface(mSurface);
	}
}
