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/*
* This file is part of the Advance project.
*
* Copyright (C) 2002, 2003 Andrea Mazzoleni
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __SCROLL_H
#define __SCROLL_H
typedef struct adv_scroll_coord_struct {
int x;
int y;
} adv_scroll_coord;
typedef struct adv_scroll_info_struct {
adv_scroll_coord* map; /**< Vector of scrolling shift. */
unsigned mac; /**< Space used in the vector. */
unsigned max; /**< Space allocated in the vector. */
int x; /**< Start position of the first image in the scroll buffer. */
int y;
unsigned width; /**< Additional size of the scroll buffer. */
unsigned height;
} adv_scroll_info;
typedef struct adv_scroll_struct {
adv_scroll_info* info; /**< Scrolling information. */
unsigned char* pre_ptr; /**< Previous image. */
unsigned char* cur_ptr; /**< Current image. */
int range_dx; /**< Horizontal range to search. */
int range_dy; /**< Vertical range to search. */
int range_limit; /**< Sum range to search. */
} adv_scroll;
adv_scroll* scroll_init(int dx, int dy, int limit);
void scroll_done(adv_scroll* scroll);
void scroll_analyze(adv_scroll* scroll, unsigned pix_width, unsigned pix_height, unsigned pix_pixel, unsigned char* pix_ptr, unsigned pix_scanline);
void scroll_last_get(adv_scroll* scroll, int* x, int* y);
adv_scroll_info* scroll_info_init(adv_scroll* scroll);
void scroll_info_done(adv_scroll_info* info);
#endif
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