GOB: Implement GCT drawing

5 files changed, 476 insertions, 0 deletions

diff --git a/engines/gob/module.mk b/engines/gob/module.mk
index 1b3f400684..15351848de 100644
--- a/engines/gob/module.mk
+++ b/engines/gob/module.mk
@@ -80,6 +80,7 @@ MODULE_OBJS := \
 	detection/detection.o \
 	pregob/pregob.o \
 	pregob/txtfile.o \
+	pregob/gctfile.o \
 	pregob/onceupon/onceupon.o \
 	pregob/onceupon/abracadabra.o \
 	pregob/onceupon/babayaga.o \
diff --git a/engines/gob/pregob/gctfile.cpp b/engines/gob/pregob/gctfile.cpp
new file mode 100644
index 0000000000..08c32cda76
--- /dev/null
+++ b/engines/gob/pregob/gctfile.cpp
@@ -0,0 +1,306 @@
+/* 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/random.h"
+#include "common/stream.h"
+
+#include "gob/surface.h"
+#include "gob/video.h"
+
+#include "gob/pregob/gctfile.h"
+
+namespace Gob {
+
+GCTFile::Chunk::Chunk() : type(kChunkTypeNone) {
+}
+
+
+GCTFile::GCTFile(Common::SeekableReadStream &gct, Common::RandomSource &rnd) : _rnd(&rnd),
+	_areaLeft(0), _areaTop(0), _areaRight(0), _areaBottom(0), _currentItem(0xFFFF) {
+
+	load(gct);
+}
+
+GCTFile::~GCTFile() {
+}
+
+void GCTFile::load(Common::SeekableReadStream &gct) {
+	gct.skip(4); // Required buffer size
+	gct.skip(2); // Unknown
+
+	// Read the selector and line counts for each item
+	const uint16 itemCount = gct.readUint16LE();
+	_items.resize(itemCount);
+
+	for (Items::iterator i = _items.begin(); i != _items.end(); ++i) {
+		const uint16 selector  = gct.readUint16LE();
+		const uint16 lineCount = gct.readUint16LE();
+
+		i->selector = selector;
+		i->lines.resize(lineCount);
+	}
+
+	// Read all item lines
+	for (Items::iterator i = _items.begin(); i != _items.end(); ++i) {
+		for (Lines::iterator l = i->lines.begin(); l != i->lines.end(); ++l) {
+			const uint16 lineSize = gct.readUint16LE();
+
+			readLine(gct, *l, lineSize);
+		}
+	}
+
+	if (gct.err())
+		error("GCTFile::load(): Failed reading GCT");
+}
+
+void GCTFile::readLine(Common::SeekableReadStream &gct, Line &line, uint16 lineSize) const {
+	line.chunks.push_back(Chunk());
+
+	while (lineSize > 0) {
+		byte c = gct.readByte();
+		lineSize--;
+
+		if (c == 0) {
+			// Command byte
+
+			if (lineSize == 0)
+				break;
+
+			byte cmd = gct.readByte();
+			lineSize--;
+
+			// Line end command
+			if (cmd == 0)
+				break;
+
+			// Item reference command
+			if (cmd == 1) {
+				if (lineSize < 2) {
+					warning("GCTFile::readLine(): Item reference command is missing parameters");
+					break;
+				}
+
+				const uint32 itemRef = gct.readUint16LE();
+				lineSize -= 2;
+
+				line.chunks.push_back(Chunk());
+				line.chunks.back().type = kChunkTypeItem;
+				line.chunks.back().item = itemRef;
+
+				line.chunks.push_back(Chunk());
+				continue;
+			}
+
+			warning("GCTFile::readLine(): Invalid command 0x%02X", cmd);
+			break;
+		}
+
+		// Text
+		line.chunks.back().type = kChunkTypeString;
+		line.chunks.back().text += (char)c;
+	}
+
+	// Skip bytes we didn't read (because of errors)
+	gct.skip(lineSize);
+
+	// Remove empty chunks from the end of the list
+	while (!line.chunks.empty() && (line.chunks.back().type == kChunkTypeNone))
+		line.chunks.pop_back();
+}
+
+uint16 GCTFile::getLineCount(uint item) const {
+	if (item >= _items.size())
+		return 0;
+
+	return _items[item].lines.size();
+}
+
+void GCTFile::selectLine(uint item, uint16 line) {
+	if ((item >= _items.size()) && (item != kSelectorAll) && (item != kSelectorRandom))
+		return;
+
+	_items[item].selector = line;
+}
+
+void GCTFile::setText(uint item, uint16 line, const Common::String &text) {
+	if ((item >= _items.size()) || (line >= _items[item].lines.size()))
+		return;
+
+	_items[item].lines[line].chunks.clear();
+	_items[item].lines[line].chunks.push_back(Chunk());
+
+	_items[item].lines[line].chunks.back().type = kChunkTypeString;
+	_items[item].lines[line].chunks.back().text = text;
+}
+
+void GCTFile::setText(uint item, const Common::String &text) {
+	if (item >= _items.size())
+		return;
+
+	_items[item].selector = 0;
+
+	_items[item].lines.resize(1);
+
+	setText(item, 0, text);
+}
+
+void GCTFile::reset() {
+	_currentItem = 0xFFFF;
+	_currentText.clear();
+}
+
+Common::String GCTFile::getLineText(const Line &line) const {
+	Common::String text;
+
+	// Go over all chunks in this line
+	for (Chunks::const_iterator c = line.chunks.begin(); c != line.chunks.end(); ++c) {
+		// A chunk is either a direct string, or a reference to another item
+
+		if        (c->type == kChunkTypeItem) {
+			Common::List<Common::String> lines;
+
+			getItemText(c->item, lines);
+			if (lines.empty())
+				continue;
+
+			if (lines.size() > 1)
+				warning("GCTFile::getLineText(): Referenced item has multiple lines");
+
+			text += lines.front();
+		} else if (c->type == kChunkTypeString)
+			text += c->text;
+	}
+
+	return text;
+}
+
+void GCTFile::getItemText(uint item, Common::List<Common::String> &text) const {
+	text.clear();
+
+	if ((item >= _items.size()) || _items[item].lines.empty())
+		return;
+
+	uint16 line = _items[item].selector;
+
+	// Draw all lines
+	if (line == kSelectorAll) {
+		for (Lines::const_iterator l = _items[item].lines.begin(); l != _items[item].lines.end(); ++l)
+			text.push_back(getLineText(*l));
+
+		return;
+	}
+
+	// Draw random line
+	if (line == kSelectorRandom)
+		line = _rnd->getRandomNumber(_items[item].lines.size() - 1);
+
+	if (line >= _items[item].lines.size())
+		return;
+
+	text.push_back(getLineText(_items[item].lines[line]));
+}
+
+void GCTFile::setArea(int16 left, int16 top, int16 right, int16 bottom) {
+	trashBuffer();
+
+	_hasArea = false;
+
+	const int16 width  = right  - left + 1;
+	const int16 height = bottom - top  + 1;
+	if ((width <= 0) || (height <= 0))
+		return;
+
+	_areaLeft   = left;
+	_areaTop    = top;
+	_areaRight  = right;
+	_areaBottom = bottom;
+
+	_hasArea = true;
+
+	resizeBuffer(width, height);
+}
+
+bool GCTFile::clear(Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom) {
+	return restoreScreen(dest, left, top, right, bottom);
+}
+
+bool GCTFile::fill(Surface &dest, uint8 color, int16 &left, int16 &top, int16 &right, int16 &bottom) {
+	left   = _areaLeft;
+	top    = _areaTop;
+	right  = _areaRight;
+	bottom = _areaBottom;
+
+	if (!hasSavedBackground())
+		saveScreen(dest, left, top, right, bottom);
+
+	dest.fillRect(left, top, right, bottom, color);
+
+	return true;
+}
+
+bool GCTFile::finished() const {
+	return (_currentItem != 0xFFFF) && _currentText.empty();
+}
+
+bool GCTFile::draw(Surface &dest, uint16 item, const Font &font, uint8 color,
+                   int16 &left, int16 &top, int16 &right, int16 &bottom) {
+
+	if ((item >= _items.size()) || !_hasArea)
+		return false;
+
+	left   = _areaLeft;
+	top    = _areaTop;
+	right  = _areaRight;
+	bottom = _areaBottom;
+
+	const int16 width  = right  - left + 1;
+	const int16 height = bottom - top  + 1;
+
+	const uint lineCount = height / font.getCharHeight();
+	if (lineCount == 0)
+		return false;
+
+	if (!hasSavedBackground())
+		saveScreen(dest, left, top, right, bottom);
+
+	if (item != _currentItem) {
+		_currentItem = item;
+
+		getItemText(_currentItem, _currentText);
+	}
+
+	if (_currentText.empty())
+		return false;
+
+	int16 y = top;
+	for (uint i = 0; (i < lineCount) && !_currentText.empty(); i++, y += font.getCharHeight()) {
+		const Common::String &line = _currentText.front();
+		const int16 x = left + ((width - (line.size() * font.getCharWidth())) / 2);
+
+		font.drawString(line, x, y, color, 0, true, dest);
+		_currentText.pop_front();
+	}
+
+	return true;
+}
+
+} // End of namespace Gob
diff --git a/engines/gob/pregob/gctfile.h b/engines/gob/pregob/gctfile.h
new file mode 100644
index 0000000000..ed6351b7a8
--- /dev/null
+++ b/engines/gob/pregob/gctfile.h
@@ -0,0 +1,149 @@
+/* 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.
+ *
+ */
+
+#ifndef GOB_PREGOB_GCTFILE_H
+#define GOB_PREGOB_GCTFILE_H
+
+#include "common/str.h"
+#include "common/array.h"
+#include "common/list.h"
+
+#include "gob/backbuffer.h"
+
+namespace Common {
+	class RandomSource;
+	class SeekableReadStream;
+}
+
+namespace Gob {
+
+class Surface;
+class Font;
+
+class GCTFile : public BackBuffer {
+public:
+	static const uint16 kSelectorAll    = 0xFFFE; ///< Print all lines.
+	static const uint16 kSelectorRandom = 0xFFFF; ///< Print a random line.
+
+
+	GCTFile(Common::SeekableReadStream &gct, Common::RandomSource &rnd);
+	~GCTFile();
+
+	/** Return the number of lines in an item. */
+	uint16 getLineCount(uint item) const;
+
+	/** Set the area the text will be printed in. */
+	void setArea(int16 left, int16 top, int16 right, int16 bottom);
+
+	/** Set which line of this item should be printed. */
+	void selectLine(uint item, uint16 line);
+
+	/** Change the text of an items' line. */
+	void setText(uint item, uint16 line, const Common::String &text);
+	/** Change the item into one one line and set that line's text. */
+	void setText(uint item, const Common::String &text);
+
+	/** Reset the item drawing state. */
+	void reset();
+
+	/** Clear the drawn text, restoring the original content. */
+	bool clear(Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom);
+
+	/** Fill the text area with a color. */
+	bool fill(Surface &dest, uint8 color, int16 &left, int16 &top, int16 &right, int16 &bottom);
+
+	/** Draw an item onto the surface, until all text has been drawn or the area is filled. */
+	bool draw(Surface &dest, uint16 item, const Font &font, uint8 color,
+	          int16 &left, int16 &top, int16 &right, int16 &bottom);
+
+	/** Did we draw all text? */
+	bool finished() const;
+
+private:
+	/** The type of a chunk. */
+	enum ChunkType {
+		kChunkTypeNone   = 0, ///< Do nothing.
+		kChunkTypeString    , ///< A direct string.
+		kChunkTypeItem        ///< A reference to an item to print instead.
+	};
+
+	/** A chunk in an item text line. */
+	struct Chunk {
+		ChunkType type; ///< The type of the chunk.
+
+		Common::String text; ///< Text to print.
+
+		int item; ///< Item to print instead.
+
+		Chunk();
+	};
+
+	typedef Common::List<Chunk> Chunks;
+
+	/** A line in an item. */
+	struct Line {
+		Chunks chunks; ///< The chunks that make up the line.
+	};
+
+	typedef Common::Array<Line> Lines;
+
+	/** A GCT item. */
+	struct Item {
+		Lines  lines;    ///< The text lines in the item
+		uint16 selector; ///< Which line to print.
+	};
+
+	typedef Common::Array<Item> Items;
+
+
+	Common::RandomSource *_rnd;
+
+	Items _items; ///< All GCT items.
+
+	// The area on which to print
+	bool  _hasArea;
+	int16 _areaLeft;
+	int16 _areaTop;
+	int16 _areaRight;
+	int16 _areaBottom;
+
+	/** Index of the current item we're drawing. */
+	uint16 _currentItem;
+	/** Text left to draw. */
+	Common::List<Common::String> _currentText;
+
+
+	// -- Loading helpers --
+
+	void load(Common::SeekableReadStream &gct);
+	void readLine(Common::SeekableReadStream &gct, Line &line, uint16 lineSize) const;
+
+
+	// -- Draw helpers --
+
+	Common::String getLineText(const Line &line) const;
+	void getItemText(uint item, Common::List<Common::String> &text) const;
+};
+
+} // End of namespace Gob
+
+#endif // GOB_PREGOB_GCTFILE_H
diff --git a/engines/gob/pregob/pregob.cpp b/engines/gob/pregob/pregob.cpp
index 4ee5430de7..033eea89f2 100644
--- a/engines/gob/pregob/pregob.cpp
+++ b/engines/gob/pregob/pregob.cpp
@@ -35,6 +35,7 @@
 #include "gob/sound/sound.h"
 
 #include "gob/pregob/pregob.h"
+#include "gob/pregob/gctfile.h"
 
 
 namespace Gob {
@@ -341,4 +342,16 @@ TXTFile *PreGob::loadTXT(const Common::String &txtFile, TXTFile::Format format)
 void PreGob::fixTXTStrings(TXTFile &txt) const {
 }
 
+GCTFile *PreGob::loadGCT(const Common::String &gctFile) const {
+	Common::SeekableReadStream *gctStream = _vm->_dataIO->getFile(gctFile);
+	if (!gctStream)
+		error("PreGob::loadGCT(): Failed to open \"%s\"", gctFile.c_str());
+
+	GCTFile *gct = new GCTFile(*gctStream, _vm->_rnd);
+
+	delete gctStream;
+
+	return gct;
+}
+
 } // End of namespace Gob
diff --git a/engines/gob/pregob/pregob.h b/engines/gob/pregob/pregob.h
index f1728036ab..686727b08b 100644
--- a/engines/gob/pregob/pregob.h
+++ b/engines/gob/pregob/pregob.h
@@ -38,6 +38,8 @@ namespace Gob {
 class GobEngine;
 class Surface;
 
+class GCTFile;
+
 class PreGob {
 public:
 	PreGob(GobEngine *vm);
@@ -164,6 +166,11 @@ protected:
 	virtual void fixTXTStrings(TXTFile &txt) const;
 
 
+	// -- GCT helpers --
+
+	GCTFile *loadGCT(const Common::String &gctFile) const;
+
+
 	GobEngine *_vm;
 
 private: