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/*
* Copyright � 2006-2016 SplinterGU (Fenix/Bennugd)
* Copyright � 2002-2006 Fenix Team (Fenix)
* Copyright � 1999-2002 Jos� Luis Cebri�n Pag�e (Fenix)
*
* This file is part of Bennu - Game Development
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
*
*/
#include "librender.h"
#include "fmath.h"
/* --------------------------------------------------------------------------- */
//uint8_t zonearray[ 128 / 8 ];
#ifdef __USE_BIT_MASK
static uint32_t zonearray[ /* DIRTYROWS * */ DIRTYCOLS ];
#else
static uint32_t zonearray[ DIRTYROWS ][ DIRTYCOLS ];
#endif
/* --------------------------------------------------------------------------- */
void gr_rects_clear()
{
memset( zonearray, 0, sizeof( zonearray ) );
}
/* --------------------------------------------------------------------------- */
/*
* FUNCTION : gr_mark_rect
*
* Updates the given rectangle as a dirty zone at the 128-bits array
*
* PARAMS :
* x, y Top-left coordinate
* width Width in pixels
* height Height in pixels
*
* RETURN VALUE :
* None
*/
void gr_mark_rect( int x, int y, int width, int height )
{
#ifdef __USE_BIT_MASK
int cx, cy;
int w, h;
int iy, lx, ly;
w = scr_width / DIRTYCOLS;
h = scr_height / DIRTYROWS;
width = ABS( width ) - 1;
height = ABS( height ) - 1;
x = MIN( x, x + width );
y = MIN( y, y + height );
iy = MAX( y / h, 0 );
lx = MIN(( x + width ) / w, DIRTYCOLS - 1 );
ly = MIN(( y + height ) / h, DIRTYROWS - 1 );
for ( cx = MAX( x / w, 0 ); cx <= lx; cx++ )
for ( cy = iy; cy <= ly; cy++ )
zonearray[ cx ] |= ( 1 << cy );
#else
int cx, cy;
int w, h;
int iy, lx, ly;
w = scr_width / DIRTYCOLS;
h = scr_height / DIRTYROWS;
if ( w * DIRTYCOLS != scr_width ) w++;
if ( h * DIRTYROWS != scr_height ) h++;
width = ABS( width ) - 1;
height = ABS( height ) - 1;
x = MIN( x, x + width );
y = MIN( y, y + height );
iy = MAX( y / h, 0 );
lx = MIN(( x + width ) / w, DIRTYCOLS - 1 );
ly = MIN(( y + height ) / h, DIRTYROWS - 1 );
for ( cx = MAX( x / w, 0 ); cx <= lx; cx++ )
for ( cy = iy; cy <= ly; cy++ )
zonearray[ cy ][ cx ] = 1;
#endif
}
/* --------------------------------------------------------------------------- */
/*
* FUNCTION : gr_mark_rects
*
* Given a 128-bits array of dirty screen zones, create an array of SDL_Rect regions
*
* PARAMS :
* zonearray Pointer to a 128-bits array with dirty screen zones = 1
* rects Pointer to a 128 REGION array
*
* RETURN VALUE :
* Number of rects filled
*/
int gr_mark_rects( REGION * rects )
{
int count = 0, x, y;
int w, h, cw, ch, x2;
w = scr_width / DIRTYCOLS;
h = scr_height / DIRTYROWS;
if ( w * DIRTYCOLS != scr_width ) w++;
if ( h * DIRTYROWS != scr_height ) h++;
for ( x = 0; x < DIRTYCOLS; x++ )
{
#ifdef __USE_BIT_MASK
if ( zonearray[ x ] )
{
for ( y = 0; y < DIRTYROWS; y++ )
{
if ( zonearray[ x ] & ( 1 << y ) )
{
zonearray[ x ] &= ~( 1 << y );
for ( cw = x + 1; ( cw < DIRTYCOLS ) && ( zonearray[ cw ] & ( 1 << y ) ); cw++ )
zonearray[ cw ] &= ~( 1 << y );
for ( ch = y + 1; ch < DIRTYROWS; ch++ )
{
/* Si hay algun hueco en el ancho de las siguiente lineas, corto aca,
y deja esta linea para otra recta */
for ( x2 = x; ( x2 < cw ) && ( zonearray[ x2 ] & ( 1 << ch ) ); x2++ );
if ( x2 < cw ) break;
/* Limpio bitmap de la recta actual */
for ( x2 = x; x2 < cw; x2++ )
zonearray[ x2 ] &= ~( 1 << ch );
}
rects[ count ].x = w * x;
rects[ count ].y = h * y;
rects[ count ].x2 = w * cw - 1 /* + rects[ count ].x */;
rects[ count ].y2 = h * ch - 1 /* + rects[ count ].y */;
count++;
}
}
}
#else
for ( y = 0; y < DIRTYROWS; y++ )
{
if ( zonearray[ y ][ x ] )
{
zonearray[ y ][ x ] = 0;
for ( cw = x + 1; ( cw < DIRTYCOLS ) && ( zonearray[ y ][ cw ] ); cw++ ) zonearray[ y ][ cw ] = 0;
for ( ch = y + 1; ch < DIRTYROWS; ch++ )
{
/* Si hay algun hueco en el ancho de las siguiente lineas, corto aca,
y deja esta linea para otra recta */
for ( x2 = x; ( x2 < cw ) && ( zonearray[ ch ][ x2 ] ); x2++ );
if ( x2 < cw ) break;
/* Limpio bitmap de la recta actual */
for ( x2 = x; x2 < cw; x2++ ) zonearray[ ch ][ x2 ] = 0;
}
rects[ count ].x = w * x;
rects[ count ].y = h * y;
rects[ count ].x2 = MIN( w * cw - 1, scr_width - 1 );
rects[ count ].y2 = MIN( h * ch - 1, scr_height - 1 );
count++;
}
}
#endif
}
return count;
}
/* --------------------------------------------------------------------------- */
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