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kc3-lang/ftgl/include/FTFont.h
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Author :
sammy
Date : 2008-04-13 21:14:44
Hash : d6a2d851
Message : * Merged trunk commits [664], [665], [666], [667], [669], [670], [671], [672] and [684], by patrick and henry: + Added FTLayout.h, FTSimpleLayout.h and FTSimpleLayout.cpp to implement a framework for layout managers and an implementation of a simple layout manager. + Updated FTGLDemo to use the new FTSimpleLayout. Changes include: - Added a font origin to specify the location to render the font. - The default text is now blatantly plagarized from the back cover of the OGL red book. - The font size is much smaller. - Font metrics are rendered differently depending on the current layout manager. - The FTSimpleLayout alignment mode is now output with other font information. - The space bar no longer cycles through the fonts. The cursor up/down keys do. - The cursor left/right keys increment/decrement the size of the current font. - The page up/page down keys cycle through the layout managers. - The home/end keys increment and decrement the line length of a simple layout - The tab key cycles through the alignment modes of a simple layout. + Fixed a bug where the trackball rotation was applied after translation. + Minor reformatting and enabled texture fonts to be selected + Un-inlined private methods...because they are called by other private inlined methods + Minor formatting changes + Adding FTLayout
- include/FTFont.h
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/* * FTGL - OpenGL font library * * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * Alternatively, you can redistribute and/or modify this software 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. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef __FTFont__ #define __FTFont__ #include <ft2build.h> #include FT_FREETYPE_H #ifdef __cplusplus #include "FTFace.h" #include "FTGL.h" class FTGlyphContainer; class FTGlyph; class FTLayout; /** * FTFont is the public interface for the FTGL library. * * Specific font classes are derived from this class. It uses the helper * classes FTFace and FTSize to access the Freetype library. This class * is abstract and deriving classes must implement the protected * <code>MakeGlyph</code> function to create glyphs of the * appropriate type. * * It is good practice after using these functions to test the error * code returned. <code>FT_Error Error()</code>. Check the freetype file fterrdef.h * for error definitions. * * @see FTFace * @see FTSize * @see FTGlyphContainer * @see FTGlyph */ class FTGL_EXPORT FTFont { public: /** * Open and read a font file. Sets Error flag. * * @param fontFilePath font file path. */ FTFont( const char* fontFilePath); /** * Open and read a font from a buffer in memory. Sets Error flag. * The buffer is owned by the client and is NOT copied by FTGL. The * pointer must be valid while using FTGL. * * @param pBufferBytes the in-memory buffer * @param bufferSizeInBytes the length of the buffer in bytes */ FTFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes); /** * Destructor */ virtual ~FTFont(); /** * Attach auxilliary file to font e.g font metrics. * * Note: not all font formats implement this function. * * @param fontFilePath auxilliary font file path. * @return <code>true</code> if file has been attached * successfully. */ bool Attach( const char* fontFilePath); /** * Attach auxilliary data to font e.g font metrics, from memory * * Note: not all font formats implement this function. * * @param pBufferBytes the in-memory buffer * @param bufferSizeInBytes the length of the buffer in bytes * @return <code>true</code> if file has been attached * successfully. */ bool Attach( const unsigned char *pBufferBytes, size_t bufferSizeInBytes); /** * Set the character map for the face. * * @param encoding Freetype enumerate for char map code. * @return <code>true</code> if charmap was valid and * set correctly */ bool CharMap( FT_Encoding encoding ); /** * Get the number of character maps in this face. * * @return character map count. */ unsigned int CharMapCount(); /** * Get a list of character maps in this face. * * @return pointer to the first encoding. */ FT_Encoding* CharMapList(); /** * Set the char size for the current face. * * @param size the face size in points (1/72 inch) * @param res the resolution of the target device. * @return <code>true</code> if size was set correctly */ virtual bool FaceSize( const unsigned int size, const unsigned int res = 72); /** * Get the current face size in points. * * @return face size */ unsigned int FaceSize() const; /** * Set the extrusion distance for the font. Only implemented by * FTGLExtrdFont * * @param depth The extrusion distance. */ virtual void Depth( float depth){} /** * Enable or disable the use of Display Lists inside FTGL * * @param useList <code>true</code> turns ON display lists. * <code>false</code> turns OFF display lists. */ void UseDisplayList( bool useList); /** * Get the global ascender height for the face. * * @return Ascender height */ float Ascender() const; /** * Gets the global descender height for the face. * * @return Descender height */ float Descender() const; /** * Gets the line spacing for the font. * * @return Line height */ float LineHeight() const; /** * Get the bounding box for a string. * * @param String a char buffer * @param StartIdx The index of the first character of String * to check. * @param EndIdx The index of the last character of String to * check. If < 0 then characters will be parsed * until a '\0' is encountered. * @param llx lower left near x coord * @param lly lower left near y coord * @param llz lower left near z coord * @param urx upper right far x coord * @param ury upper right far y coord * @param urz upper right far z coord */ void BBox(const char *String,const int StartIdx,const int EndIdx, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz); /** * Get the bounding box for a string. * * @param String a wchar_t buffer * @param StartIdx The index of the first character of String * to check. * @param EndIdx The index of the last character of String * to check. If < 0 then characters will * be parsed until a '\0' is encountered. * @param llx lower left near x coord * @param lly lower left near y coord * @param llz lower left near z coord * @param urx upper right far x coord * @param ury upper right far y coord * @param urz upper right far z coord */ void BBox(const wchar_t *String,const int StartIdx,const int EndIdx, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz); /** * Get the bounding box for a string. * * @param string a char string * @param llx lower left near x coord * @param lly lower left near y coord * @param llz lower left near z coord * @param urx upper right far x coord * @param ury upper right far y coord * @param urz upper right far z coord */ void BBox( const char* string, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz) { BBox(string,0,-1,llx,lly,llz,urx,ury,urz); } /** * Get the bounding box for a string. * * @param string a wchar_t string * @param llx lower left near x coord * @param lly lower left near y coord * @param llz lower left near z coord * @param urx upper right far x coord * @param ury upper right far y coord * @param urz upper right far z coord */ void BBox( const wchar_t* string, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz) { BBox(string,0,-1,llx,lly,llz,urx,ury,urz); } /** * Get the advance width for a string. * * @param string a wchar_t string * @return advance width */ float Advance( const wchar_t* string); /** * Get the advance width for a string. * * @param string a char string * @return advance width */ float Advance( const char* string); /** * Render a string of characters * * @param string 'C' style string to be output. */ virtual void Render( const char* string ); /** * Render a string of characters * * @param string wchar_t string to be output. */ virtual void Render( const wchar_t* string ); /** * Queries the Font for errors. * * @return The current error code. */ FT_Error Error() const { return err;} protected: /** * Construct a glyph of the correct type. * * Clients must overide the function and return their specialised * FTGlyph. * * @param g The glyph index NOT the char code. * @return An FT****Glyph or <code>null</code> on failure. */ virtual FTGlyph* MakeGlyph( unsigned int g) = 0; /** * Current face object */ FTFace face; /** * Current size object */ FTSize charSize; /** * Flag to enable or disable the use of Display Lists inside FTGL * <code>true</code> turns ON display lists. * <code>false</code> turns OFF display lists. */ bool useDisplayLists; /** * Current error code. Zero means no error. */ FT_Error err; private: /** * Render a character. * This function does an implicit conversion on its arguments. * * @param chr current character * @param nextChr next character * @param origin The position of the origin of the character. * After rendering the point referenced by origin * will be incremented by the kerning advance of * char and nextChr. */ void DoRender(const unsigned int chr, const unsigned int nextChr, FTPoint &origin); /** * Check that the glyph at <code>chr</code> exist. If not load it. * * @param chr character index * @return <code>true</code> if the glyph can be created. */ bool CheckGlyph( const unsigned int chr); /** * An object that holds a list of glyphs */ FTGlyphContainer* glyphList; /** * Current pen or cursor position; */ FTPoint pen; /* Allow FTLayout classes to access DoRender and CheckGlyph */ friend class FTLayout; }; #endif //__cplusplus #ifdef __cplusplus extern "C" { namespace C { #endif typedef struct FTGLfont FTGLfont; FTGL_EXPORT int ftglAttachFile (FTGLfont*, const char*); FTGL_EXPORT int ftglAttachData (FTGLfont*, const unsigned char *, size_t); FTGL_EXPORT int ftglCharMap (FTGLfont*, FT_Encoding); FTGL_EXPORT unsigned int ftglCharMapCount (FTGLfont*); FTGL_EXPORT FT_Encoding* CharMapList (FTGLfont*); FTGL_EXPORT int ftglSetFaceSize (FTGLfont*, unsigned int); FTGL_EXPORT int ftglSetFaceSizeRes (FTGLfont*, unsigned int, unsigned int); FTGL_EXPORT unsigned int ftglGetFaceSize (FTGLfont*); FTGL_EXPORT void ftglSetDepth (FTGLfont*, float); FTGL_EXPORT void ftglUseDisplayList (FTGLfont*, int); FTGL_EXPORT float ftglAscender (FTGLfont*); FTGL_EXPORT float ftglDescender (FTGLfont*); FTGL_EXPORT float ftglLineHeight (FTGLfont*); FTGL_EXPORT void ftglBBox (FTGLfont*, const char *, float[]); FTGL_EXPORT float ftglAdvance (FTGLfont*, const char *); FTGL_EXPORT void ftglRender (FTGLfont*, const char *); FTGL_EXPORT FT_Error ftglError (FTGLfont*); #ifdef __cplusplus } } #endif #endif // __FTFont__