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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* $URL$
* $Id$
*/
/*
* Bitmap decoder used in engines:
* - parallaction
* - saga
*/
#ifndef GRAPHICS_IFF_H
#define GRAPHICS_IFF_H
#include "common/stream.h"
namespace Graphics {
struct Surface;
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));
}
void load(Common::ReadStream *stream);
};
struct ILBMDecoder {
/**
* ILBM header data, necessary for loadBitmap()
*/
Graphics::BMHD _header;
/**
* Available decoding modes for loadBitmap().
*/
enum {
ILBM_UNPACK_PLANES = 0xFF, ///< Decode all bitplanes, and map 1 pixel to 1 byte.
ILBM_PACK_PLANES = 0x100, ///< Request unpacking, used as a mask with below options.
ILBM_1_PLANES = 1, ///< Decode only the first bitplane, don't pack.
ILBM_1_PACK_PLANES = ILBM_1_PLANES | ILBM_PACK_PLANES, ///< Decode only the first bitplane, pack 8 pixels in 1 byte.
ILBM_2_PLANES = 2, ///< Decode first 2 bitplanes, don't pack.
ILBM_2_PACK_PLANES = ILBM_2_PLANES | ILBM_PACK_PLANES, ///< Decode first 2 bitplanes, pack 4 pixels in 1 byte.
ILBM_3_PLANES = 3, ///< Decode first 3 bitplanes, don't pack.
ILBM_4_PLANES = 4, ///< Decode first 4 bitplanes, don't pack.
ILBM_4_PACK_PLANES = ILBM_4_PLANES | ILBM_PACK_PLANES, ///< Decode first 4 bitplanes, pack 2 pixels in 1 byte.
ILBM_5_PLANES = 5, ///< Decode first 5 bitplanes, don't pack.
ILBM_8_PLANES = 8 ///< Decode all 8 bitplanes.
};
/**
* Fills the _header member from the given stream.
*/
void loadHeader(Common::ReadStream *stream);
/**
* Loads and unpacks the ILBM bitmap data from the stream into the buffer.
* The functions assumes the buffer is large enough to contain all data.
* The caller controls how data should be packed by choosing mode from
* the enum above.
*/
void loadBitmap(uint32 mode, byte *buffer, Common::ReadStream *stream);
/**
* Converts from bitplanar to chunky representation. Intended for internal
* usage, but you can be (ab)use it from client code if you know what you
* are doing.
*/
void planarToChunky(byte *out, uint32 width, byte *in, uint32 planeWidth, uint32 nPlanes, bool packPlanes);
};
/**
* Handles PBM subtype of IFF FORM files
*/
void decodePBM(Common::ReadStream &input, Surface &surface, byte *colors);
/**
* Decode a given PackBits encoded stream.
*
* PackBits is an RLE compression algorithm introduced by Apple. It is also
* used to encode ILBM and PBM subtypes of IFF files, and some flavours of
* TIFF.
*
* As there is no compression across row boundaries in the above formats,
* read() will extract a *new* line on each call, discarding any alignment
* or padding.
*/
class PackBitsReadStream : public Common::ReadStream {
protected:
Common::ReadStream *_input;
public:
PackBitsReadStream(Common::ReadStream &input);
~PackBitsReadStream();
virtual bool eos() const;
uint32 read(void *dataPtr, uint32 dataSize);
};
} // End of namespace Graphics
#endif
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