254 lines
9.9 KiB
C++
254 lines
9.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGTEXT_FONT
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#define OSGTEXT_FONT 1
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#include <string>
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#include <istream>
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#include <osg/TexEnv>
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#include <osgText/Glyph>
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#include <osgDB/Options>
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#include <OpenThreads/Mutex>
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namespace osgText {
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// forward declare Font
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class Font;
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/** Read a font from specified file. The filename may contain a path.
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* It will search for the font file in the following places in this order:
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* - In the current directory
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* - All paths defined in OSG_FILE_PATH or OSGFILEPATH environment variable
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* - Filename with path stripped: In the current directory
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* - Filename with path stripped: All paths defined in OSG_FILE_PATH or OSGFILEPATH
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*
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* Then the file will be searched in OS specific directories in the following order:
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* - Again in the current directory
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* - Windows: In C:/winnt/fonts
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* - Windows: In C:/windows/fonts
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* - Windows: In the fonts directory of the windows install directory
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* - Other OS: In /usr/share/fonts/ttf
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* - Other OS: In /usr/share/fonts/ttf/western
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* - Other OS: In /usr/share/fonts/ttf/decoratives
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*
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* If the given file could not be found, the path part will be stripped and
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* the file will be searched again in the OS specific directories.
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*/
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extern OSGTEXT_EXPORT Font* readFontFile(const std::string& filename, const osgDB::Options* userOptions = 0);
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/** read a font from specified stream.*/
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extern OSGTEXT_EXPORT Font* readFontStream(std::istream& stream, const osgDB::Options* userOptions = 0);
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extern OSGTEXT_EXPORT osg::ref_ptr<Font> readRefFontFile(const std::string& filename, const osgDB::Options* userOptions = 0);
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extern OSGTEXT_EXPORT osg::ref_ptr<Font> readRefFontStream(std::istream& stream, const osgDB::Options* userOptions = 0);
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extern OSGTEXT_EXPORT std::string findFontFile(const std::string& str);
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/** Pure virtual base class for fonts.
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* Concrete implementation are the DefaultFont found in src/osgText/DefaultFont.cpp
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* and FreeTypeFont found in src/osgPlugins/freetype/FreeTypeFont.cpp*/
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class OSGTEXT_EXPORT Font : public osg::Object
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{
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// declare the interface to a font.
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public:
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// forward declare nested classes.
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class FontImplementation;
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public:
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Font(FontImplementation* implementation=0);
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virtual osg::Object* cloneType() const { return 0; } // cloneType() not appropriate
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virtual osg::Object* clone(const osg::CopyOp&) const { return 0; } // clone() not appropriate
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Font*>(obj)!=NULL; }
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virtual const char* className() const { return "Font"; }
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virtual const char* libraryName() const { return "osgText"; }
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virtual std::string getFileName() const;
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static osg::ref_ptr<Font>& getDefaultFont();
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void setTexEnv(osg::TexEnv* texenv) { if (texenv) _texenv = texenv; }
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inline osg::TexEnv* getTexEnv() { return _texenv.get(); }
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inline const osg::TexEnv* getTexEnv() const { return _texenv.get(); }
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void setStateSet(osg::StateSet* stateset) { _stateset = stateset; }
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osg::StateSet* getStateSet() { return _stateset.get(); }
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const osg::StateSet* getStateSet() const { return _stateset.get(); }
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/** Get a kerning (adjustment of spacing of two adjacent character) for specified charcodes, w.r.t the current font size hint.*/
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virtual osg::Vec2 getKerning(unsigned int leftcharcode,unsigned int rightcharcode, KerningType kerningType);
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/** Get a Glyph for specified charcode, and the font size nearest to the current font size hint.*/
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virtual Glyph* getGlyph(const FontResolution& fontSize, unsigned int charcode);
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/** Get a Glyph3D for specified charcode.*/
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virtual Glyph3D* getGlyph3D(unsigned int charcode);
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/** Return true if this font provides vertical alignments and spacing or glyphs.*/
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virtual bool hasVertical() const;
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/** Get the ascender and descender sizes of the font where supported by the FontImplementation,
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* return true on success, return false when not supported.*/
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virtual bool getVerticalSize(float& ascender, float& descender) const { return _implementation ? _implementation->getVerticalSize(ascender, descender) : false; }
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/** Set the margin around each glyph,
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* to ensure that texture filtering doesn't bleed adjacent glyph's into each other.
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* Default margin is 1 texels.*/
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void setGlyphImageMargin(unsigned int margin);
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unsigned int getGlyphImageMargin() const;
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/** Set the margin ratio around each glyph, relative to the glyph's size.
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* to ensure that texture filtering doesn't bleed adjacent glyph's into each other.
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* Default margin is 0.05.*/
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void setGlyphImageMarginRatio(float margin);
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float getGlyphImageMarginRatio() const;
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/** Set the size of texture to create to store the glyph images when rendering.
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* Note, this doesn't affect already created Texture Glhph's.*/
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void setTextureSizeHint(unsigned int width,unsigned int height);
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unsigned int getTextureWidthHint() const;
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unsigned int getTextureHeightHint() const;
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/** Set the minification texture filter to use when creating the texture to store the glyph images when rendering.
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* Note, this doesn't affect already created Texture Glhph's.*/
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void setMinFilterHint(osg::Texture::FilterMode mode);
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osg::Texture::FilterMode getMinFilterHint() const;
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/** Set the magnification texture filter to use when creating the texture to store the glyph images when rendering.
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* Note, this doesn't affect already created Texture Glhph's.*/
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void setMagFilterHint(osg::Texture::FilterMode mode);
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osg::Texture::FilterMode getMagFilterHint() const;
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unsigned int getFontDepth() const { return _depth; }
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void setNumberCurveSamples(unsigned int numSamples) { _numCurveSamples = numSamples; }
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unsigned int getNumberCurveSamples() const { return _numCurveSamples; }
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// make Text a friend to allow it add and remove its entry in the Font's _textList.
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friend class FontImplementation;
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void setImplementation(FontImplementation* implementation);
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FontImplementation* getImplementation();
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const FontImplementation* getImplementation() const;
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/** Set whether to use a mutex to ensure ref() and unref() are thread safe.*/
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virtual void setThreadSafeRefUnref(bool threadSafe);
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/** Resize any per context GLObject buffers to specified size. */
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virtual void resizeGLObjectBuffers(unsigned int maxSize);
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/** If State is non-zero, this function releases OpenGL objects for
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* the specified graphics context. Otherwise, releases OpenGL objexts
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* for all graphics contexts. */
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virtual void releaseGLObjects(osg::State* state=0) const;
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typedef OpenThreads::Mutex FontMutex;
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typedef std::vector< osg::ref_ptr<GlyphTexture> > GlyphTextureList;
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GlyphTextureList& getGlyphTextureList() { return _glyphTextureList; }
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protected:
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virtual ~Font();
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void addGlyph(const FontResolution& fontRes, unsigned int charcode, Glyph* glyph);
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typedef std::vector< osg::ref_ptr<osg::StateSet> > StateSetList;
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typedef std::map< unsigned int, osg::ref_ptr<Glyph> > GlyphMap;
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typedef std::map< unsigned int, osg::ref_ptr<Glyph3D> > Glyph3DMap;
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typedef std::map< FontResolution, GlyphMap > FontSizeGlyphMap;
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mutable OpenThreads::Mutex _glyphMapMutex;
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osg::ref_ptr<osg::TexEnv> _texenv;
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osg::ref_ptr<osg::StateSet> _stateset;
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FontSizeGlyphMap _sizeGlyphMap;
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GlyphTextureList _glyphTextureList;
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Glyph3DMap _glyph3DMap;
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// current active size of font
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FontResolution _fontSize;
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unsigned int _margin;
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float _marginRatio;
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unsigned int _textureWidthHint;
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unsigned int _textureHeightHint;
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osg::Texture::FilterMode _minFilterHint;
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osg::Texture::FilterMode _magFilterHint;
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unsigned int _depth;
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unsigned int _numCurveSamples;
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osg::ref_ptr<FontImplementation> _implementation;
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// declare the nested classes.
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public:
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class FontImplementation : public osg::Referenced
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{
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public:
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FontImplementation():
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osg::Referenced(true),
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_facade(0) {}
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virtual std::string getFileName() const = 0;
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virtual bool supportsMultipleFontResolutions() const = 0;
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/** Get a Glyph for specified charcode, and the font size nearest to the current font size hint.*/
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virtual Glyph* getGlyph(const FontResolution& fontRes, unsigned int charcode) = 0;
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/** Get a Glyph3D for specified charcode.*/
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virtual Glyph3D* getGlyph3D(unsigned int charcode) = 0;
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/** Get a kerning (adjustment of spacing of two adjacent character) for specified charcodes, w.r.t the current font size hint.*/
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virtual osg::Vec2 getKerning(unsigned int leftcharcode,unsigned int rightcharcode, KerningType kerningType) = 0;
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/** Return true if this font provides vertical alignments and spacing or glyphs.*/
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virtual bool hasVertical() const = 0;
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void addGlyph(const FontResolution& fontRes, unsigned int charcode, Glyph* glyph)
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{
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_facade->addGlyph(fontRes, charcode, glyph);
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}
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Font* _facade;
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virtual bool getVerticalSize(float & /*ascender*/, float & /*descender*/) const { return false; }
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};
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};
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}
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#endif
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