effect.h

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/*
 * RVE: Realtime Video Effects
 * Copyright (C) 2002 Jonas Jensen <jbj@knef.dk>
 * 
 * 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 _EFFECT_H
#define _EFFECT_H

#include <stdexcept>
#include <memory>
#include <vector>

#include "animation.h"
#include "bitmap.h"
#include "lib.h"
#include "rve.h"

class Effect {
public:
    Effect(): _maxtime(0) { _fps = global_fps; }
    virtual ~Effect() {}

    virtual void run() = 0;

    int get_time() const { return _maxtime; }
    void set_time(int maxtime) { _maxtime = maxtime; }
    int get_fps() const { return _fps; }
    void set_fps(int fps) { _fps = fps; }

protected:
    void animate(int from, int to, int maxtime = 0);

    virtual void step(int value) = 0;

    int _maxtime, _fps;
    int _oldval;
};

class Effect_move_animation: public Effect {
public:
    virtual void run();
    void param(int x1, int y1, int x2, int y2, Animation &anim, int alpha = 0) {
        _x1 = x1; _y1 = y1; _x2 = x2; _y2 = y2;
        _anim = &anim;
        _alpha = alpha;
    }

protected:
    virtual void step(int value);
    
    int _x1, _y1, _x2, _y2;
    int _distance, _alpha;
    Animation *_anim;
};

class Effect_move: public Effect {
public:
    virtual void run();
    void param(int x1, int y1, int x2, int y2, const Bitmap &bitmap) {
        _x1 = x1; _y1 = y1; _x2 = x2; _y2 = y2;
        _orig_bitmap.reset(bitmap.clone());
    }

protected:
    virtual void step(int value);
    
    int _x1, _y1, _x2, _y2;
    int _distance, _left, _top;
    std::auto_ptr<Bitmap> _orig_bitmap;
    std::auto_ptr<Bitmap> _used_bitmap;
};

class Effect_changealpha: public Effect {
public:
    void param(int from, int to, int width, int height, int xpos, int ypos) {
        _from = from; _to = to;
        _width = width; _height = height; _xpos = xpos; _ypos = ypos;
    }

protected:
    int _from, _to;
    int _width, _height, _xpos, _ypos;
};

class Effect_fade: public Effect_changealpha {
public:
    virtual void run() { animate(_from, _to); }

protected:
    virtual void step(int value) {
        set_alpha(_width, _height, _xpos, _ypos, value);
    }
};

class Effect_tile: public Effect_changealpha {
public:
    virtual void run();

protected:
    virtual void step(int value);

    int _length, _per_row, _numtiles;
    std::vector<int> _sequence;
};

class Effect_counter: public Effect {
public:
    Effect_counter(): _text(NULL) {}
    
    virtual void run();

    void param(int xpos, int ypos, int from, int digits, int groupspacing = 5,
            RGBA *background = NULL, int marginx = 0, int marginy = 0,
            int shift = 0, int digitsize = 0, char *text = NULL) {
        _xpos = xpos; _ypos = ypos; _from = from; _text = text;
        _anim.param(_fps, from, digits, groupspacing, background, marginx, 
                marginy, shift, digitsize);
    }

protected:
    virtual void step(int value);
    void Effect_counter::anim_part(int state, int frames);

    int _xpos, _ypos, _from;
    char *_text;

    int _state, _xfrom, _textxfrom, _textx, _texty, _countery, _canvasy;
    RollCount _anim;
    RGBA _textbm, _canvas;

    static const int _speed = 20;
};

class Effect_movebars: public Effect {
public:
    class Bar {
    public:
        int oldheight, newheight, xpos;
    };

    virtual void run();
    void param(std::vector<Bar> &bars, int barypos, int barwidth,
            int barheight, int valpha, int halpha) {
        _bars = &bars;
        _barypos = barypos; _barwidth = barwidth; _barheight = barheight;
        _valpha = valpha; _halpha = halpha;
    }

protected:
    virtual void step(int value);

    std::vector<Bar> *_bars;
    int _barypos, _barwidth, _barheight;
    int _valpha, _halpha;
    int _maxdelta;
};

#endif

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