Initial commit

engines/cryomni3d/image/hnm.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 "cryomni3d/image/hnm.h"
+
+#include "common/stream.h"
+#include "common/substream.h"
+#include "common/textconsole.h"
+#include "graphics/pixelformat.h"
+#include "graphics/surface.h"
+#include "image/codecs/codec.h"
+
+#include "image/codecs/hnm.h"
+
+namespace Image {
+
+HNMFileDecoder::HNMFileDecoder(const Graphics::PixelFormat &format) :
+	_format(format), _surface(nullptr), _codec(nullptr) {
+}
+
+HNMFileDecoder::~HNMFileDecoder() {
+	destroy();
+}
+
+void HNMFileDecoder::destroy() {
+	delete _codec;
+	_codec = nullptr;
+	_surface = nullptr;
+}
+
+bool HNMFileDecoder::loadStream(Common::SeekableReadStream &stream) {
+	destroy();
+
+	uint32 tag = stream.readUint32BE();
+
+	/* Only HNM6 for HNM images */
+	if (tag != MKTAG('H', 'N', 'M', '6')) {
+		return false;
+	}
+
+	//uint16 ukn = stream.readUint16BE();
+	//byte audioflags = stream.readByte();
+	//byte bpp = stream.readByte();
+	stream.skip(4);
+	uint16 width = stream.readUint16LE();
+	uint16 height = stream.readUint16LE();
+	//uint32 filesize = stream.readUint32LE();
+	//uint32 numframes = stream.readUint32LE();
+	//uint32 ukn2 = stream.readUint32LE();
+	//uint16 speed = stream.readUint16LE();
+	//uint16 maxbuffer = stream.readUint16LE();
+	//uint32 buffer_size = stream.readUint32LE();
+	//byte unknownStr[16];
+	//byte copyright[16];
+	//stream.read(unknownStr, sizeof(unknownStr));
+	//stream.read(copyright, sizeof(copyright));
+
+	stream.skip(52);
+
+	if (width == 0 || height == 0) {
+		return false;
+	}
+
+	// Read frame header
+	uint32 frameSize = stream.readUint32LE();
+	if (frameSize < 12) {
+		return false;
+	}
+	frameSize -= 4;
+
+	// Read chunk header
+	uint32 chunkSize = stream.readUint32LE();
+	uint16 chunkTag = stream.readUint16BE();
+	//uint16 chunkUkn = stream.readUint16LE();
+	stream.skip(2);
+
+	if (frameSize < chunkSize ||
+	        chunkSize < 8 + 24) {
+		return false;
+	}
+
+	bool warp;
+	if (chunkTag == MKTAG16('I', 'W')) {
+		warp = true;
+	} else if (chunkTag == MKTAG16('I', 'X')) {
+		warp = false;
+	} else {
+		return false;
+	}
+
+	// buffer_size is not reliable on IW and we already have the real size of the image source
+	_codec = createHNM6Decoder(width, height, _format, chunkSize, false);
+	_codec->setWarpMode(warp);
+	_surface = _codec->decodeFrame(stream);
+	return true;
+}
+
+} // End of namespace Image