2 files changed, 183 insertions, 0 deletions
diff --git a/graphics/video/codecs/msrle.cpp b/graphics/video/codecs/msrle.cpp
new file mode 100644
index 0000000000..64099430d3
--- /dev/null
+++ b/graphics/video/codecs/msrle.cpp
@@ -0,0 +1,133 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+// Based off ffmpeg's msrledec.c
+
+#include "graphics/video/codecs/msrle.h"
+
+namespace Graphics {
+
+MSRLEDecoder::MSRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel) {
+	_surface = new Graphics::Surface();
+	_surface->create(width, height, 1);
+	_bitsPerPixel = bitsPerPixel;
+}
+
+MSRLEDecoder::~MSRLEDecoder() {
+	_surface->free();
+	delete _surface;
+}
+
+Surface *MSRLEDecoder::decodeImage(Common::SeekableReadStream *stream) {
+	if (_bitsPerPixel == 8) {
+		decode8(stream);
+	} else
+		error("Unhandled %d bit Microsoft RLE encoding", _bitsPerPixel);
+
+	return _surface;
+}
+
+void MSRLEDecoder::decode8(Common::SeekableReadStream *stream) {
+
+	int x = 0;
+	int y = _surface->h - 1;
+
+	byte *data = (byte *) _surface->pixels;
+	uint16 width  = _surface->w;
+	uint16 height = _surface->h;
+
+	byte *output     = data + ((height - 1) * width);
+	byte *output_end = data + ((height)     * width);
+
+	while (!stream->eos()) {
+		byte count = stream->readByte();
+		byte value = stream->readByte();
+
+		if (count == 0) {
+			if (value == 0) {
+				// End of line
+
+				x = 0;
+				y--;
+				output = data + (y * width);
+
+				if (y < 0) {
+					warning("Next line is beyond picture bounds");
+					return;
+				}
+
+			} else if (value == 1) {
+				// End of image
+
+				return;
+			} else if (value == 2) {
+				// Skip
+
+				count = stream->readByte();
+				value = stream->readByte();
+
+				y -= value;
+				x += count;
+
+				if (y < 0) {
+					warning("Skip beyond picture bounds");
+					return;
+				}
+
+				output = data + ((y * width) + x);
+
+			} else {
+				// Copy data
+
+				if (output + value > output_end) {
+					stream->skip(value);
+					continue;
+				}
+
+				for (int i = 0; i < value; i++)
+					*output++ = stream->readByte();
+
+				if (value & 1)
+					stream->skip(1);
+
+				x += value;
+			}
+
+		} else {
+			// Run data
+
+			if (output + count > output_end)
+				continue;
+
+			for (int i = 0; i < count; i++, x++)
+				*output++ = value;
+		}
+
+	}
+
+	warning("No end-of-picture code");
+}
+
+} // End of namespace Graphics
diff --git a/graphics/video/codecs/msrle.h b/graphics/video/codecs/msrle.h
new file mode 100644
index 0000000000..634fe754ba
--- /dev/null
+++ b/graphics/video/codecs/msrle.h
@@ -0,0 +1,50 @@
+/* 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 GRAPHICS_MSRLE_H
+#define GRAPHICS_MSRLE_H
+
+#include "graphics/video/codecs/codec.h"
+
+namespace Graphics {
+
+class MSRLEDecoder : public Codec {
+public:
+	MSRLEDecoder(uint16 width, uint16 height, byte bitsPerPixel);
+	~MSRLEDecoder();
+
+	Surface *decodeImage(Common::SeekableReadStream *stream);
+
+private:
+	byte _bitsPerPixel;
+
+	Surface *_surface;
+
+	void decode8(Common::SeekableReadStream *stream);
+};
+
+} // End of namespace Graphics
+
+#endif