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https://github.com/libretro/scummvm.git
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80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001/2002 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include <stdafx.h>
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#include "codec1.h"
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#include "chunk.h"
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#include "blitter.h"
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Codec1Decoder::~Codec1Decoder() {
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}
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bool Codec1Decoder::decode(Blitter & dst, Chunk & src) {
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byte val;
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int32 size_line;
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int32 code, length;
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int32 h, height = getRect().height();
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for(h = 0; h < height; h++) {
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size_line = src.getWord(); // size of compressed line !
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#ifdef DEBUG_CODEC1
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debug(7, "codec1 : h == %d, size_line == %d", h, size_line);
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#endif
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while(size_line > 0) {
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code = src.getByte();
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size_line --;
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length = (code >> 1) + 1;
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#ifdef DEBUG_CODEC1
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debug(7, "codec1 : length == %d", length);
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#endif
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if(code & 1) {
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val = src.getByte();
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size_line --;
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if(val)
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dst.put(val, length);
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else
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dst.advance(length);
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#ifdef DEBUG_CODEC1
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debug(7, "codec1 : blitting %d times %d", length, val);
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#endif
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} else {
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size_line -= length;
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#ifdef DEBUG_CODEC1
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debug(7, "codec1 : blitting %d entries", length);
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#endif
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while(length--) {
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val = src.getByte();
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if(val)
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dst.put(val);
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else dst.advance();
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}
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}
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}
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}
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#ifdef DEBUG_CODEC1
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if(!src.eof()) {
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int32 len = src.getSize() - src.tell();
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debug(7, "codec1: remaining length after decode == %d", len);
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}
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#endif
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return true;
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}
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