Implement proper font handling

1 files changed, 140 insertions, 0 deletions

diff --git a/src/fontengine.h b/src/fontengine.h
new file mode 100644
index 000000000..6a5339770
--- /dev/null
+++ b/src/fontengine.h
@@ -0,0 +1,140 @@
+/*
+Minetest
+Copyright (C) 2010-2014 sapier <sapier at gmx dot net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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 __FONTENGINE_H__
+#define __FONTENGINE_H__
+
+#include <map>
+#include <vector>
+#include "IGUIFont.h"
+#include "IGUISkin.h"
+#include "IGUIEnvironment.h"
+#include "settings.h"
+
+#define FONT_SIZE_UNSPECIFIED 0xFFFFFFFF
+
+enum FontMode {
+	FM_Standard = 0,
+	FM_Mono,
+	FM_Fallback,
+	FM_Simple,
+	FM_SimpleMono,
+	FM_MaxMode,
+	FM_Unspecified
+};
+
+class FontEngine
+{
+public:
+
+	FontEngine(Settings* main_settings, gui::IGUIEnvironment* env);
+
+	~FontEngine();
+
+	/** get Font */
+	irr::gui::IGUIFont* getFont(unsigned int font_size=FONT_SIZE_UNSPECIFIED,
+			FontMode mode=FM_Unspecified);
+
+	/** get text height for a specific font */
+	unsigned int getTextHeight(unsigned int font_size=FONT_SIZE_UNSPECIFIED,
+			FontMode mode=FM_Unspecified);
+
+	/** get text width if a text for a specific font */
+	unsigned int getTextWidth(const std::string& text,
+			unsigned int font_size=FONT_SIZE_UNSPECIFIED,
+			FontMode mode=FM_Unspecified)
+	{
+		return getTextWidth(narrow_to_wide(text));
+	}
+
+	/** get text width if a text for a specific font */
+	unsigned int getTextWidth(const std::wstring& text,
+			unsigned int font_size=FONT_SIZE_UNSPECIFIED,
+			FontMode mode=FM_Unspecified);
+
+	/** get line height for a specific font (including empty room between lines) */
+	unsigned int getLineHeight(unsigned int font_size=FONT_SIZE_UNSPECIFIED,
+			FontMode mode=FM_Unspecified);
+
+	/** get default font size */
+	unsigned int getDefaultFontSize();
+
+	/** initialize font engine */
+	void initialize(Settings* main_settings, gui::IGUIEnvironment* env);
+
+	/** update internal parameters from settings */
+	void readSettings();
+
+private:
+	/** disable copy constructor */
+	FontEngine() :
+		m_settings(NULL),
+		m_env(NULL),
+		m_font_cache(),
+		m_default_size(),
+		m_currentMode(FM_Standard),
+		m_lastMode(),
+		m_lastSize(0),
+		m_lastFont(NULL)
+	{};
+
+	/** update content of font cache in case of a setting change made it invalid */
+	void updateFontCache();
+
+	/** initialize a new font */
+	void initFont(unsigned int basesize, FontMode mode=FM_Unspecified);
+
+	/** initialize a font without freetype */
+	void initSimpleFont(unsigned int basesize, FontMode mode);
+
+	/** update current minetest skin with font changes */
+	void updateSkin();
+
+	/** clean cache */
+	void cleanCache();
+
+	/** pointer to settings for registering callbacks or reading config */
+	Settings* m_settings;
+
+	/** pointer to irrlicht gui environment */
+	gui::IGUIEnvironment* m_env;
+
+	/** internal storage for caching fonts of different size */
+	std::map<unsigned int, irr::gui::IGUIFont*> m_font_cache[FM_MaxMode];
+
+	/** default font size to use */
+	unsigned int m_default_size[FM_MaxMode];
+
+	/** current font engine mode */
+	FontMode m_currentMode;
+
+	/** font mode of last request */
+	FontMode m_lastMode;
+
+	/** size of last request */
+	unsigned int m_lastSize;
+
+	/** last font returned */
+	irr::gui::IGUIFont* m_lastFont;
+
+};
+
+/** interface to access main font engine*/
+extern FontEngine* glb_fontengine;
+
+#endif