1 files changed, 139 insertions, 0 deletions
diff --git a/graphics/iff.h b/graphics/iff.h
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--- /dev/null
+++ b/graphics/iff.h
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+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 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_IFF_H
+#define GRAPHICS_IFF_H
+
+#include "common/iff_container.h"
+
+namespace Graphics {
+
+class 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));
+	}
+};
+
+
+//	handles ILBM subtype of IFF FORM files
+//
+class ILBMDecoder : public Common::IFFParser {
+
+protected:
+	void readBMHD(Common::IFFChunk &chunk);
+	void readCMAP(Common::IFFChunk &chunk);
+	void readBODY(Common::IFFChunk &chunk);
+
+	BMHD 	_bitmapHeader;
+	uint32 	_colorCount;
+
+	Surface *_surface;
+	byte    **_colors;
+
+	void fillPlane(byte *out, byte* buf, uint32 width, uint32 plane);
+
+public:
+	ILBMDecoder(Common::ReadStream &input, Surface &surface, byte *&colors);
+	virtual ~ILBMDecoder() { }
+	void decode();
+};
+
+
+//	handles PBM subtype of IFF FORM files
+//
+class PBMDecoder : public Common::IFFParser {
+
+protected:
+	void readBMHD(Common::IFFChunk &chunk);
+	void readCMAP(Common::IFFChunk &chunk);
+	void readBODY(Common::IFFChunk &chunk);
+
+	BMHD 	_bitmapHeader;
+	uint32 	_colorCount;
+
+	Surface *_surface;
+	byte    **_colors;
+
+public:
+	PBMDecoder(Common::ReadStream &input, Surface &surface, byte *&colors);
+	virtual ~PBMDecoder() { }
+	void decode();
+};
+
+/*
+	TODO: rename this routine to decodePBM, and update the SAGA code that's
+	using it. The routine has already been implemented using the above PBMDecoder.
+*/
+void decodeILBM(Common::ReadStream &input, Surface &surface, byte *&colors);
+
+
+/*
+	PackBits is a RLE compression algorithm introduced
+	by Apple. It is also used to encode ILBM and PBM
+	subtypes of IFF files, and some flavours of TIFF.
+
+	The following implementation uses a static storage
+	and is buffered, that means you can't destroy the
+	input stream before you are done with it.
+*/
+class PackBitsReadStream : public Common::ReadStream {
+
+protected:
+	Common::ReadStream *_input;
+
+	byte	_storage[257];
+	byte	*_wStoragePos;
+	byte	*_rStoragePos;
+
+	int32	_outSize;
+	byte*	_out;
+	int32	_fed;
+	int32	_unpacked;
+
+	void store(byte b);
+	void feed();
+	void unpack();
+
+public:
+	PackBitsReadStream(Common::ReadStream &input);
+	~PackBitsReadStream();
+
+	virtual bool eos() const;
+	uint32 read(void *dataPtr, uint32 dataSize);
+};
+
+}
+
+#endif