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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001/2002 The ScummVM project
*
* 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.
*
* $Header$
*
*/
#include <stdafx.h>
#include "blitter.h"
#include "chunk.h"
#include <assert.h>
#include <string.h> // for memcpy
#ifndef min
#define min(x, y) ((x) > (y) ? (y) : (x))
#endif
Blitter::Blitter(char * ptr, const Point & dstsize, const Rect & src) :
_ptr(ptr),
_clip(dstsize),
_src(src),
_cur(src.left(), src.top()),
_outside(false) {
#ifdef DEBUG_CLIPPER
_clipped = 0;
_clippedBlock = 0;
#endif
assert(_ptr);
assert(_clip.getX() > 0 && _clip.getY() > 0);
assert(_src.width() > 0 && _src.height() > 0);
assert(_src.left() < _clip.getX() && _src.right() <= _clip.getX());
assert(_src.top() < _clip.getY() && _src.bottom() <= _clip.getY());
_offset = _ptr + _clip.getX() * _cur.getY() + _cur.getX();
}
Blitter::~Blitter() {
#ifdef DEBUG_CLIPPER
if(_clipped || _clippedBlock) {
debug(3, "blitter clipped %d pixels and %d blocks", _clipped, _clippedBlock);
}
#endif
}
void Blitter::advance(int x, int y) {
if(y != 0) {
_cur.set(_src.left() + x, _cur.getY() + y);
} else {
_cur.getX() += x;
if(_cur.getX() >= _src.right()) {
_cur.set(_src.left(), _cur.getY()+1);
}
}
_offset = _ptr + _clip.getX() * _cur.getY() + _cur.getX();
_outside = ! _src.isInside(_cur);
}
void Blitter::advanceBlock(int x, int y) {
advance(x*4, y*4);
}
void Blitter::put(char data) {
if(!_outside) {
*_offset = data;
advance();
}
#ifdef DEBUG_CLIPPER
else _clipped ++;
#endif
}
void Blitter::put(char data, unsigned int len) {
while(len) {
if(_outside) {
#ifdef DEBUG_CLIPPER
_clipped += len;
#endif
break;
}
int l = min((int)len, min(_clip.getX() - _cur.getX(), _src.right() - _cur.getX()));
len -= l;
memset(_offset, data, l);
advance(l);
}
}
void Blitter::blit(char * ptr, unsigned int len) {
while(len) {
if(_outside) {
#ifdef DEBUG_CLIPPER
_clipped += len;
#endif
break;
}
int l = min((int)len, min(_clip.getX() - _cur.getX(), _src.right() - _cur.getX()));
len -= l;
memcpy(_offset, ptr, l);
ptr += l;
advance(l);
}
}
void Blitter::blit(Chunk & src, unsigned int len) {
while(len) {
if(_outside) {
#ifdef DEBUG_CLIPPER
_clipped += len;
#endif
break;
}
int l = min((int)len, min(_clip.getX() -_cur.getX(), _src.right() - _cur.getX()));
len -= l;
src.read(_offset, l);
advance(l);
}
}
void Blitter::putBlock(unsigned int data) {
if(_cur.getX() + 3 < _src.right() && _cur.getY() + 3 < _src.bottom()) { // This is clipping
assert((_clip.getX() & 3) == 0);
unsigned int * dst = (unsigned int *)_offset;
int line_size = _clip.getX() >> 2;
*dst = data; dst += line_size;
*dst = data; dst += line_size;
*dst = data; dst += line_size;
*dst = data;
#ifdef DEBUG_CLIPPER
} else {
_clippedBlock ++;
#endif
}
advanceBlock();
}
void Blitter::putBlock(unsigned int d1, unsigned int d2, unsigned int d3, unsigned int d4) {
if(_cur.getX() + 3 < _src.right() && _cur.getY() + 3 < _src.bottom()) { // This is clipping
assert((_clip.getX() & 3) == 0);
unsigned int * dst = (unsigned int *)_offset;
int line_size = _clip.getX() >> 2;
*dst = d4; dst += line_size;
*dst = d3; dst += line_size;
*dst = d2; dst += line_size;
*dst = d1;
#ifdef DEBUG_CLIPPER
} else {
_clippedBlock ++;
#endif
}
advanceBlock();
}
void Blitter::putBlock(unsigned char * data) {
if(_cur.getX() + 3 < _src.right() && _cur.getY() + 3 < _src.bottom()) { // This is clipping
assert((_clip.getX() & 3) == 0);
unsigned int * dst = (unsigned int *)_offset;
int line_size = _clip.getX() >> 2;
unsigned int * src = (unsigned int *)data;
*dst = *src++; dst += line_size;
*dst = *src++; dst += line_size;
*dst = *src++; dst += line_size;
*dst = *src++;
#ifdef DEBUG_CLIPPER
} else {
_clippedBlock ++;
#endif
}
advanceBlock();
}
void Blitter::putBlock(Chunk & src) {
if(_cur.getX() + 3 < _src.right() && _cur.getY() + 3 < _src.bottom()) { // This is clipping
assert((_clip.getX() & 3) == 0);
unsigned int * dst = (unsigned int *)_offset;
int line_size = _clip.getX() >> 2;
*dst = src.getDword(); dst += line_size;
*dst = src.getDword(); dst += line_size;
*dst = src.getDword(); dst += line_size;
*dst = src.getDword();
#ifdef DEBUG_CLIPPER
} else {
_clippedBlock ++;
#endif
}
advanceBlock();
}
void Blitter::blockCopy(int offset) {
if(_cur.getX() + 3 < _src.right() && _cur.getY() + 3 < _src.bottom()) {// This is clipping
char * dst = _offset;
*((unsigned int *)dst) = *((unsigned int *)(dst + offset));
dst += _clip.getX();
*((unsigned int *)dst) = *((unsigned int *)(dst + offset));
dst += _clip.getX();
*((unsigned int *)dst) = *((unsigned int *)(dst + offset));
dst += _clip.getX();
*((unsigned int *)dst) = *((unsigned int *)(dst + offset));
#ifdef DEBUG_CLIPPER
} else {
_clippedBlock ++;
#endif
}
advanceBlock();
}
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