1 files changed, 256 insertions, 0 deletions
diff --git a/engines/supernova/graphics.cpp b/engines/supernova/graphics.cpp
new file mode 100644
index 0000000000..d7839c1dcb
--- /dev/null
+++ b/engines/supernova/graphics.cpp
@@ -0,0 +1,256 @@
+/* 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.
+ *
+ */
+
+#include "common/algorithm.h"
+#include "common/file.h"
+#include "common/stream.h"
+#include "common/system.h"
+#include "common/config-manager.h"
+#include "graphics/palette.h"
+#include "graphics/surface.h"
+
+#include "graphics.h"
+#include "msn_def.h"
+#include "supernova.h"
+
+namespace Supernova {
+
+MSNImageDecoder::MSNImageDecoder() {
+	_palette = nullptr;
+	_encodedImage = nullptr;
+	_filenumber = -1;
+	_pitch = 0;
+	_numSections = 0;
+	_numClickFields = 0;
+}
+
+MSNImageDecoder::~MSNImageDecoder() {
+	destroy();
+}
+
+bool MSNImageDecoder::init(int filenumber) {
+	Common::File file;
+	if (!file.open(Common::String::format("msn_data.%03d", filenumber))) {
+		warning("Image data file msn_data.%03d could not be read!", filenumber);
+		return false;
+	}
+
+	_filenumber = filenumber;
+	loadStream(file);
+
+	return true;
+}
+
+bool MSNImageDecoder::loadFromEngineDataFile() {
+	Common::String name;
+	if (_filenumber == 1)
+		name = "IMG1";
+	else if (_filenumber == 2)
+		name = "IMG2";
+	else
+		return false;
+
+	Common::String cur_lang = ConfMan.get("language");
+
+	// Note: we don't print any warning or errors here if we cannot find the file
+	// or the format is not as expected. We will get those warning when reading the
+	// strings anyway (actually the engine will even refuse to start).
+	Common::File f;
+	if (!f.open(SUPERNOVA_DAT))
+		return false;
+
+	char id[5], lang[5];
+	id[4] = lang[4] = '\0';
+	f.read(id, 3);
+	if (strncmp(id, "MSN", 3) != 0)
+		return false;
+	int version = f.readByte();
+	if (version != SUPERNOVA_DAT_VERSION)
+		return false;
+
+	while (!f.eos()) {
+		f.read(id, 4);
+		f.read(lang, 4);
+		uint32 size = f.readUint32LE();
+		if (f.eos())
+			break;
+		if (name == id && cur_lang == lang) {
+			return f.read(_encodedImage, size) == size;
+		} else
+			f.skip(size);
+	}
+
+	return false;
+}
+
+bool MSNImageDecoder::loadStream(Common::SeekableReadStream &stream) {
+	destroy();
+
+	uint size = 0;
+	size  = (stream.readUint16LE() + 0xF) >> 4;
+	size |= (stream.readUint16LE() & 0xF) << 12;
+	size += 0x70;    // zus_paragraph
+	size *= 16;      // a paragraph is 16 bytes
+	_encodedImage = new byte[size];
+
+	_palette = new byte[717];
+	g_system->getPaletteManager()->grabPalette(_palette, 16, 239);
+
+	byte pal_diff;
+	byte flag = stream.readByte();
+	if (flag == 0) {
+		pal_diff = 0;
+		_palette[141] = 0xE0;
+		_palette[142] = 0xE0;
+		_palette[143] = 0xE0;
+	} else {
+		pal_diff = 1;
+		for (int i = flag * 3; i != 0; --i) {
+			_palette[717 - i] = stream.readByte() << 2;
+		}
+	}
+
+	_numSections = stream.readByte();
+	for (uint i = 0; i < kMaxSections; ++i) {
+		_section[i].addressHigh = 0xff;
+		_section[i].addressLow = 0xffff;
+		_section[i].x2 = 0;
+		_section[i].next = 0;
+	}
+	for (int i = 0; i < _numSections; ++i) {
+		_section[i].x1 = stream.readUint16LE();
+		_section[i].x2 = stream.readUint16LE();
+		_section[i].y1 = stream.readByte();
+		_section[i].y2 = stream.readByte();
+		_section[i].next = stream.readByte();
+		_section[i].addressLow = stream.readUint16LE();
+		_section[i].addressHigh = stream.readByte();
+	}
+
+	_numClickFields = stream.readByte();
+	for (int i = 0; i < _numClickFields; ++i) {
+		_clickField[i].x1 = stream.readUint16LE();
+		_clickField[i].x2 = stream.readUint16LE();
+		_clickField[i].y1 = stream.readByte();
+		_clickField[i].y2 = stream.readByte();
+		_clickField[i].next = stream.readByte();
+	}
+	for (int i = _numClickFields; i < kMaxClickFields; ++i) {
+		_clickField[i].x1 = 0;
+		_clickField[i].x2 = 0;
+		_clickField[i].y1 = 0;
+		_clickField[i].y2 = 0;
+		_clickField[i].next = 0;
+	}
+
+	// Newspaper images may be in the engine data file. So first try to read
+	// it from there.
+	if (!loadFromEngineDataFile()) {
+		// Load the image from the stream
+		byte zwCodes[256] = {0};
+		byte numRepeat = stream.readByte();
+		byte numZw = stream.readByte();
+		stream.read(zwCodes, numZw);
+		numZw += numRepeat;
+
+		byte input = 0;
+		uint i = 0;
+
+		while (stream.read(&input, 1)) {
+			if (input < numRepeat) {
+				++input;
+				byte value = stream.readByte();
+				for (--value; input > 0; --input) {
+					_encodedImage[i++] = value;
+				}
+			} else if (input < numZw) {
+				input = zwCodes[input - numRepeat];
+				--input;
+				_encodedImage[i++] = input;
+				_encodedImage[i++] = input;
+			} else {
+				input -= pal_diff;
+				_encodedImage[i++] = input;
+			}
+		}
+	}
+
+	loadSections();
+
+	return true;
+}
+
+bool MSNImageDecoder::loadSections() {
+	bool isNewspaper = _filenumber == 1 || _filenumber == 2;
+	int imageWidth = isNewspaper ? 640 : 320;
+	int imageHeight = isNewspaper ? 480 : 200;
+	_pitch = imageWidth;
+
+	for (int section = 0; section < _numSections; ++section) {
+		Graphics::Surface *surface = new Graphics::Surface;
+		_sectionSurfaces.push_back(surface);
+
+		if (isNewspaper) {
+			surface->create(imageWidth, imageHeight, g_system->getScreenFormat());
+			byte *surfacePixels = static_cast<byte *>(surface->getPixels());
+			for (int i = 0; i < imageWidth * imageHeight / 8; ++i) {
+				*surfacePixels++ = (_encodedImage[i] & 0x80) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x40) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x20) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x10) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x08) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x04) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x02) ? kColorWhite63 : kColorBlack;
+				*surfacePixels++ = (_encodedImage[i] & 0x01) ? kColorWhite63 : kColorBlack;
+			}
+		} else {
+			uint32 offset = (_section[section].addressHigh << 16) + _section[section].addressLow;
+			if (offset == kInvalidAddress || _section[section].x2 == 0) {
+				return false;
+			}
+			int width = _section[section].x2 - _section[section].x1 + 1;
+			int height = _section[section].y2 - _section[section].y1 + 1;
+			surface->create(width, height, g_system->getScreenFormat());
+			byte *surfacePixels = static_cast<byte *>(surface->getPixels());
+			Common::copy(_encodedImage + offset, _encodedImage + offset + width * height, surfacePixels);
+		}
+	}
+
+	return true;
+}
+
+void MSNImageDecoder::destroy() {
+	if (_palette) {
+		delete[] _palette;
+		_palette = NULL;
+	}
+	if (_encodedImage) {
+		delete[] _encodedImage;
+		_encodedImage = NULL;
+	}
+	for (Common::Array<Graphics::Surface *>::iterator it = _sectionSurfaces.begin();
+	     it != _sectionSurfaces.end(); ++it) {
+		(*it)->free();
+	}
+}
+
+}