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kc3-lang/ftgl/include/FTFont.h
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- include/FTFont.h
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#ifndef __FTFont__ #define __FTFont__ #include <ft2build.h> #include FT_FREETYPE_H #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> * * @see FTFace * @see FTSize * @see FTGlyphContainer * @see FTGlyph */ class FTGL_EXPORT FTFont { public: /** * Open and read a font file. Sets Error flag. * * @param fontname font file name. */ FTFont( const char* fontname); /** * Open and read a font from a buffer in memory. Sets Error flag. * * @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 filename auxilliary font file name. * @return <code>true</code> if file has been attached * successfully. */ bool Attach( const char* filename); /** * 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 ); /** * 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 d The extrusion distance. */ virtual void Depth( float d){} /** * 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; /** * 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. */ inline virtual FTGlyph* MakeGlyph( unsigned int g) = 0; /** * Current face object */ FTFace face; /** * Current size object */ FTSize charSize; /** * Current error code. Zero means no error. */ FT_Error err; private: /** * Render a character. * This function does an implicit conversion on it's 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 */ void 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 // __FTFont__