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/* -*- C++ -*- */
/*
GAV - Gpl Arcade Volleyball
Copyright (C) 2002
GAV team (http://sourceforge.net/projects/gav/)
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.
*/
#include "FrameSeq.h"
#define max(x, y) ((x)>(y)?(x):(y))
#define min(x, y) ((x)<(y)?(x):(y))
void FrameSeq::blit(int idx, SDL_Surface * dest, SDL_Rect * rect) {
SDL_Rect r;
r.x = (idx % _nframes) * _width;
r.y = 0;
r.w = _width;
r.h = _surface->h;
SDL_BlitSurface(_surface, &r, dest, rect);
}
Uint16 CreateHicolorPixel(SDL_PixelFormat *fmt, Uint8 red,
Uint8 green, Uint8 blue) {
return( ((red >> fmt->Rloss) << fmt->Rshift) +
((green >> fmt->Gloss) << fmt->Gshift) +
((blue >> fmt->Bloss) << fmt->Bshift) );
}
bool
FrameSeq::collidesWith(FrameSeq *fs, int idx1, int idx2, SDL_Rect * rect1,
SDL_Rect * rect2) {
int xmin = max(rect1->x, rect2->x);
int xmax = min(rect1->x + _width, rect2->x + fs->_width);
int ymin = max(rect1->y, rect2->y);
int ymax = min(rect1->y + _height, rect2->y + fs->_height);
if ( (xmin > xmax) || (ymin > ymax) ) return(false);
Uint16 *pix1 = (Uint16 *) _surface->pixels;
Uint16 *pix2 = (Uint16 *) fs->_surface->pixels;
Uint16 empty_pixel = CreateHicolorPixel(screen->format, 0, 0, 0);
int sp1 = (_surface->pitch / 2);
int sp2 = (fs->_surface->pitch / 2);
int xdisp1 = ((idx1 % _nframes) * _width);
int xdisp2 = ((idx2 % fs->_nframes) * fs->_width);
while ( ymin <= ymax ) {
int xrun = xmin;
while ( xrun <= xmax ) {
int p1off = sp1 * (ymin - rect1->y) + xdisp1 + (xrun - rect1->x);
int p2off = sp2 * (ymin - rect2->y) + xdisp2 + (xrun - rect2->x);
if ( ( pix1[p1off] != empty_pixel ) &&
( pix2[p2off] != empty_pixel) )
return(true);
xrun++;
}
ymin++;
}
return(false);
}
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