Initial commit

engines/gob/image/brc.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "brc.h"
+
+#include "common/stream.h"
+#include "common/textconsole.h"
+
+namespace Image {
+
+BRCDecoder::BRCDecoder(): _palette(0), _format(2, 5, 5, 5, 0, 10, 5, 0, 0) {
+}
+
+
+BRCDecoder::~BRCDecoder() {
+	destroy();
+}
+
+void BRCDecoder::destroy() {
+	_surface.free();
+}
+
+void BRCDecoder::readRawChunk(Common::SeekableReadStream &stream, uint16 *&dest) {
+	byte chunkSize = stream.readByte();
+	for (byte i = 0; i < chunkSize; i++) {
+		*dest++ = stream.readUint16LE();
+	}
+}
+
+void BRCDecoder::readRLEChunk(Common::SeekableReadStream &stream, uint16 *&dest) {
+	byte chunkSize = stream.readByte();
+	for (byte i = 0; i < chunkSize; i++) {
+		byte runLength = stream.readByte();
+		uint16 pixel = stream.readUint16LE();
+		for (byte j = 0; j < runLength; j++)
+			*dest++ = pixel;
+	}
+}
+
+void BRCDecoder::readRawChunkColumnWise(Common::SeekableReadStream &stream, uint16 *&dest, uint16 *&destColumnStart, uint32 &remainingHeight) {
+	byte chunkSize = stream.readByte();
+	for (byte i = 0; i < chunkSize; i++) {
+		uint16 pixel = stream.readUint16LE();
+		*dest = pixel;
+		remainingHeight--;
+		if (remainingHeight == 0) {
+			++destColumnStart;
+			dest = destColumnStart;
+			remainingHeight = _surface.h;
+		} else {
+			dest += _surface.w;
+		}
+	}
+}
+
+void BRCDecoder::readRLEChunkColumnWise(Common::SeekableReadStream &stream, uint16 *&dest, uint16 *&destColumnStart, uint32 &remainingHeight) {
+	byte chunkSize = stream.readByte();
+	for (byte i = 0; i < chunkSize; i++) {
+		byte runLength = stream.readByte();
+		uint16 pixel = stream.readUint16LE();
+		for (byte j = 0; j < runLength; j++) {
+			*dest = pixel;
+			remainingHeight--;
+			if (remainingHeight == 0) {
+				++destColumnStart;
+				dest = destColumnStart;
+				remainingHeight = _surface.h;
+			} else {
+				dest += _surface.w;
+			}
+		}
+	}
+}
+
+void BRCDecoder::loadBRCData(Common::SeekableReadStream &stream, uint32 nbrOfChunks, bool firstChunkIsRLE) {
+	uint16 *dest = (uint16*) _surface.getBasePtr(0, 0);
+	if (firstChunkIsRLE) {
+		for (uint32 i = 0; i < nbrOfChunks; i++) {
+			readRLEChunk(stream, dest);
+			readRawChunk(stream, dest);
+		}
+	} else {
+		for (uint32 i = 0; i < nbrOfChunks; i++) {
+			readRawChunk(stream, dest);
+			readRLEChunk(stream, dest);
+		}
+	}
+}
+void BRCDecoder::loadBRCDataColumnWise(Common::SeekableReadStream &stream, uint32 nbrOfChunks, bool firstChunkIsRLE) {
+	uint16 *dest = (uint16*) _surface.getBasePtr(0, 0);
+	uint16 *destColumnStart = dest;
+	uint32 remainingHeight = _surface.h;
+	if (firstChunkIsRLE) {
+		for (uint32 i = 0; i < nbrOfChunks; i++) {
+			readRLEChunkColumnWise(stream, dest, destColumnStart, remainingHeight);
+			readRawChunkColumnWise(stream, dest, destColumnStart, remainingHeight);
+		}
+	} else {
+		for (uint32 i = 0; i < nbrOfChunks; i++) {
+			readRawChunkColumnWise(stream, dest, destColumnStart, remainingHeight);
+			readRLEChunkColumnWise(stream, dest, destColumnStart, remainingHeight);
+		}
+	}
+}
+
+bool BRCDecoder::loadStream(Common::SeekableReadStream &stream) {
+	destroy();
+
+	uint32 fileType = stream.readUint32BE();
+
+	if (fileType != MKTAG('B', 'R', 'C', '\0')) {
+		warning("Missing BRC header");
+		return false;
+	}
+
+	stream.skip(8); // unknown
+	stream.readUint32LE(); // data size
+
+	uint32 width = stream.readUint32LE();
+	uint32 height = stream.readUint32LE();
+
+	if (width == 0 || height == 0)
+		return false;
+
+	uint32 bpp = stream.readUint32LE();
+	if (bpp != 2) {
+		warning("Unsupported bpp (%d) for BRCDecoder", bpp);
+		return false;
+	}
+
+	_surface.create(width, height, _format);
+
+	uint32 flags = stream.readUint32LE();
+	uint32 headerSize = stream.readUint32LE();
+	uint32 nbrOfChunks = stream.readUint32LE();
+
+	bool columnWise = !(flags & 0x10);
+	bool firstChunkIsRLE = flags & 2;
+
+	stream.seek(headerSize, SEEK_SET);
+	if (columnWise)
+		loadBRCDataColumnWise(stream, nbrOfChunks, firstChunkIsRLE);
+	else
+		loadBRCData(stream, nbrOfChunks, firstChunkIsRLE);
+
+	return true;
+}
+
+
+} // End of namespace Image