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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*/
#ifndef GRAPHICS_ILBM_H
#define GRAPHICS_ILBM_H
namespace Graphics {
void decodeILBM(Common::ReadStream &input, Surface &surface, byte *&colors);
typedef uint32 IFF_ID;
struct Chunk {
IFF_ID id;
uint32 size;
uint32 bytesRead;
Common::ReadStream *_input;
Chunk(Common::ReadStream *input): _input(input) {
size = bytesRead = 0;
}
void incBytesRead(uint32 inc) {
bytesRead += inc;
if (bytesRead > size) {
error("Chunk overead");
}
}
void readHeader() {
id = _input->readUint32BE();
size = _input->readUint32BE();
bytesRead = 0;
}
bool eos() {
return (size - bytesRead) == 0;
}
void feed() {
if (size % 2) {
size++;
}
while (!_input->eos() && !eos()) {
readByte();
}
}
byte readByte() {
incBytesRead(1);
return _input->readByte();
}
int8 readSByte() {
incBytesRead(1);
return _input->readSByte();
}
uint16 readUint16() {
incBytesRead(2);
return _input->readUint16BE();
}
uint32 readUint32() {
incBytesRead(4);
return _input->readUint32BE();
}
int16 readSint16() {
return (int16)readUint16();
}
int32 readSint32() {
return (int32)readUint32();
}
};
struct BMHD {
uint16 width, height;
uint16 x, y;
byte depth;
byte masking;
byte pack;
byte flags;
uint16 transparentColor;
byte xAspect, yAspect;
uint16 pageWidth, pageHeight;
BMHD() {
memset(this, 0, sizeof(*this));
}
};
class IFFDecoder {
public:
IFFDecoder(Common::ReadStream &input);
virtual ~IFFDecoder() {}
virtual void decode(Surface &surface, byte *&colors);
protected:
Chunk _formChunk;
Chunk _chunk;
IFF_ID _typeId;
BMHD _bitmapHeader;
uint32 _colorCount;
Surface *_surface;
byte **_colors;
virtual bool isTypeSupported(IFF_ID type) = 0;
virtual void readBODY() = 0;
virtual void readBMHD();
virtual void readCMAP();
virtual void readCRNG();
};
class PBMDecoder : public IFFDecoder {
public:
PBMDecoder(Common::ReadStream &input) : IFFDecoder(input) {}
protected:
bool isTypeSupported(IFF_ID type);
void readBODY();
};
class ILBMDecoder : public IFFDecoder {
protected:
bool isTypeSupported(IFF_ID type);
void readBODY();
void readCRNG();
void expandLine(byte *buf, uint32 width);
void fillPlane(byte *out, byte* buf, uint32 width, uint32 plane);
public:
ILBMDecoder(Common::ReadStream &input);
~ILBMDecoder();
};
} // End of namespace Graphics
#endif
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