/*
  Copyright (C) 2009 Facundo Domínguez 

  This file is part of Spacejunk.

  Spacejunk 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 3 of the License, or
  (at your option) any later version.

  Foobar 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "fade.h"
#include "graphic.h"
#include "sge.h"


bool Fade::step() {
    switch (mode) {
    case IN:
        if (fade_in(delta,Graphic::ticks()-inittime)) {
            light_fade_end();
            mode=NONE;
            return false;
        }
        break;
    case OUT:
        if (fade_out(delta,Graphic::ticks()-inittime)) {
            dark_fade_end();
            mode=NONE;
            return false;
        }
        break;
    default:
        return false;
    }
    return true;
};

void Fade::setMode(FadeMode fm,int delta) {
    mode=fm;
    inittime=Graphic::ticks();
    this->delta=delta;
    switch (mode) {
    case IN:
        dark_fade_end();
        break;
    case OUT:
    case NONE:
        ;
    }
};

void Fade::dark_fade_end() {
    SDL_Surface * screen=Graphic::getScreen();
    if (screen->format->palette) {
        memset(mycolors, 0, sizeof(mycolors));
        SDL_SetPalette(screen, SDL_PHYSPAL, mycolors, 0, screen->format->palette->ncolors);
    } else {
        fade(0);
    }
}

void Fade::light_fade_end() {
    SDL_Surface * screen=Graphic::getScreen();
    if (screen->format->palette) {
        SDL_SetPalette(screen, SDL_PHYSPAL, screen->format->palette->colors, 0, screen->format->palette->ncolors);
    }
}

void Fade::fade(float f) {
    SDL_Surface * screen=Graphic::getScreen();

    if (screen->format->palette) {
        memcpy(mycolors,screen->format->palette->colors, screen->format->palette->ncolors*sizeof(SDL_Color));
        for (int i=0;i<screen->format->palette->ncolors;i++) {
            mycolors[i].r=Uint8(mycolors[i].r*f);
            mycolors[i].g=Uint8(mycolors[i].g*f);
            mycolors[i].b=Uint8(mycolors[i].b*f);
        }
        SDL_SetPalette(screen,SDL_PHYSPAL,mycolors,0,screen->format->palette->ncolors);
    } else {
        sge_FilledRectAlpha(screen,0,0,screen->w-1,screen->h-1,SDL_MapRGB(screen->format,0,0,0), Uint16((1-f)*255));
    }
}

bool Fade::fade_in(int max,int delta) {
    if (delta<=max) {
        fade(float(delta)/max);
        return false;
    } else return true;
}


bool Fade::fade_out(int max,int delta) {
    if (delta<=max) {
        fade(float(max-delta)/max);
        return false;
    } else return true;
}