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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 "codec1.h"
#include "chunk.h"
#include "blitter.h"
Codec1Decoder::~Codec1Decoder() {
}
bool Codec1Decoder::decode(Blitter & dst, Chunk & src) {
byte val;
int32 size_line;
int32 code, length;
int32 h, height = getRect().height();
for(h = 0; h < height; h++) {
size_line = src.getWord(); // size of compressed line !
#ifdef DEBUG_CODEC1
debug(7, "codec1 : h == %d, size_line == %d", h, size_line);
#endif
while(size_line > 0) {
code = src.getByte();
size_line --;
length = (code >> 1) + 1;
#ifdef DEBUG_CODEC1
debug(7, "codec1 : length == %d", length);
#endif
if(code & 1) {
val = src.getByte();
size_line --;
if(val)
dst.put(val, length);
else
dst.advance(length);
#ifdef DEBUG_CODEC1
debug(7, "codec1 : blitting %d times %d", length, val);
#endif
} else {
size_line -= length;
#ifdef DEBUG_CODEC1
debug(7, "codec1 : blitting %d entries", length);
#endif
while(length--) {
val = src.getByte();
if(val)
dst.put(val);
else dst.advance();
}
}
}
}
#ifdef DEBUG_CODEC1
if(!src.eof()) {
int32 len = src.getSize() - src.tell();
debug(7, "codec1: remaining length after decode == %d", len);
}
#endif
return true;
}
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