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/* -*- C++ -*-
*
* DirtyRect.cpp - Invalid region on text_surface which should be updated
*
* Copyright (c) 2001-2012 Ogapee. All rights reserved.
*
* ogapee@aqua.dti2.ne.jp
*
* 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
*/
#include "DirtyRect.h"
DirtyRect::DirtyRect()
{
screen_width = screen_height = 0;
bounding_box.w = bounding_box.h = 0;
}
DirtyRect::DirtyRect( const DirtyRect &d )
{
screen_width = d.screen_width;
screen_height = d.screen_height;
bounding_box = d.bounding_box;
}
DirtyRect& DirtyRect::operator =( const DirtyRect &d )
{
screen_width = d.screen_width;
screen_height = d.screen_height;
bounding_box = d.bounding_box;
return *this;
}
DirtyRect::~DirtyRect()
{
}
void DirtyRect::setDimension(int w, int h)
{
screen_width = w;
screen_height = h;
}
void DirtyRect::add( SDL_Rect src )
{
//printf("add %d %d %d %d\n", src.x, src.y, src.w, src.h );
if ( src.w == 0 || src.h == 0 ) return;
if (src.x < 0){
if (src.w < -src.x) return;
src.w += src.x;
src.x = 0;
}
if (src.y < 0){
if (src.h < -src.y) return;
src.h += src.y;
src.y = 0;
}
if (src.x >= screen_width) return;
if (src.x+src.w >= screen_width)
src.w = screen_width-src.x;
if (src.y >= screen_height) return;
if (src.y+src.h >= screen_height)
src.h = screen_height-src.y;
bounding_box = calcBoundingBox( bounding_box, src );
}
SDL_Rect DirtyRect::calcBoundingBox( SDL_Rect src1, SDL_Rect &src2 )
{
if ( src2.w == 0 || src2.h == 0 ){
return src1;
}
if ( src1.w == 0 || src1.h == 0 ){
return src2;
}
if ( src1.x > src2.x ){
src1.w += src1.x - src2.x;
src1.x = src2.x;
}
if ( src1.y > src2.y ){
src1.h += src1.y - src2.y;
src1.y = src2.y;
}
if ( src1.x + src1.w < src2.x + src2.w ){
src1.w = src2.x + src2.w - src1.x;
}
if ( src1.y + src1.h < src2.y + src2.h ){
src1.h = src2.y + src2.h - src1.y;
}
return src1;
}
void DirtyRect::clear()
{
bounding_box.w = bounding_box.h = 0;
}
void DirtyRect::fill( int w, int h )
{
bounding_box.x = bounding_box.y = 0;
bounding_box.w = w;
bounding_box.h = h;
}
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