Add Mohawk engine code. Part 1/3: main code.

svn-id: r46727

1 files changed, 159 insertions, 0 deletions

diff --git a/engines/mohawk/bitmap.h b/engines/mohawk/bitmap.h
new file mode 100644
index 0000000000..18c51bc478
--- /dev/null
+++ b/engines/mohawk/bitmap.h
@@ -0,0 +1,159 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef MOHAWK_BITMAP_H
+#define MOHAWK_BITMAP_H
+
+#include "mohawk/graphics.h"
+
+#include "common/scummsys.h"
+#include "common/stream.h"
+#include "graphics/surface.h"
+
+namespace Mohawk {
+
+class ImageData;
+
+enum BitmapFormat {
+	kBitsPerPixel1 = 0x0000,
+	kBitsPerPixel4 = 0x0001,
+	kBitsPerPixel8 = 0x0002,
+	kBitsPerPixel16 = 0x0003,
+	kBitsPerPixel24 = 0x0004,
+	kBitsPerPixelMask = 0x0007,
+	kBitmapHasCLUT = 0x0008,
+	kDrawMASK = 0x00f0,
+	kDrawRaw = 0x0000,
+	kDrawRLE8 = 0x0010,
+	kDrawMSRLE8 = 0x0020,
+	kDrawRLE = 0x0030,
+	kPackMASK = 0x0f00,
+	kPackNone = 0x0000,
+	kPackLZ = 0x0100,
+	kPackLZ1 = 0x0200,
+	kPackRiven = 0x0400,
+	kPackXDec = 0x0f00,
+	kFlagMASK = 0xf000,
+	kFlag16_80X86 = 0x1000, // 16 bit pixel data has been converted to 80X86 format
+	kFlag24_MAC = 0x1000 // 24 bit pixel data has been converted to MAC 32 bit format
+};
+
+struct BitmapHeader {
+	uint16 width;
+	uint16 height;
+	int16 bytesPerRow;
+	uint16 format;
+
+	struct ColorTable {
+		uint16 tableSize;
+		byte rgbBits;
+		byte colorCount;
+		byte* palette;   // In 8bpp only
+	} colorTable;
+};
+
+class MohawkBitmap {
+public:
+	MohawkBitmap();
+	virtual ~MohawkBitmap();
+
+	virtual ImageData *decodeImage(Common::SeekableReadStream *stream);
+
+	// Unpack Functions
+	void unpackRaw();
+	void unpackLZ();
+	void unpackLZ1();
+	void unpackRiven();
+
+	// Draw Functions
+	void drawRaw();
+	void drawRLE8();
+	void drawRLE();
+	
+protected:
+	BitmapHeader _header;
+	byte getBitsPerPixel();
+
+	// The actual LZ decoder
+	static Common::SeekableReadStream *decompressLZ(Common::SeekableReadStream *stream, uint32 uncompressedSize);
+
+private:
+	Common::SeekableReadStream *_data;
+	Graphics::Surface *_surface;
+
+	const char *getPackName();
+	void unpackImage();
+	const char *getDrawName();
+	void drawImage();
+
+	// Riven Decoding
+	void handleRivenSubcommandStream(byte count, byte *&dst);
+};
+
+// Myst uses a different image format than that of other Mohawk games.
+// It essentially uses a Windows bitmap with the LZ encoding from the
+// Mohawk Bitmap format.
+class MystBitmap : public MohawkBitmap {
+public:
+	MystBitmap() : MohawkBitmap() {}
+	~MystBitmap() {}
+
+	ImageData *decodeImage(Common::SeekableReadStream *stream);
+
+private:	
+	struct BitmapHeader {
+		uint16 type;
+		uint32 size;
+		uint16 res1;
+		uint16 res2;
+		uint32 imageOffset;
+	} _header;
+
+	struct InfoHeader {
+		uint32 size;
+		uint32 width;
+		uint32 height;
+		uint16 planes;
+		uint16 bitsPerPixel;
+		uint32 compression;
+		uint32 imageSize;
+		uint32 pixelsPerMeterX;
+		uint32 pixelsPerMeterY;
+		uint32 colorsUsed;
+		uint32 colorsImportant;
+	} _info;
+};
+
+class OldMohawkBitmap : public MohawkBitmap {
+public:
+	OldMohawkBitmap() : MohawkBitmap() {}
+	~OldMohawkBitmap() {}
+
+	ImageData *decodeImage(Common::SeekableReadStream *stream);
+};
+
+} // End of namespace Mohawk
+
+#endif