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277 lines
8 KiB
C
277 lines
8 KiB
C
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#ifndef __FTFont__
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#define __FTFont__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include "FTFace.h"
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#include "FTGL.h"
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class FTGlyphContainer;
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class FTGlyph;
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/**
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* FTFont is the public interface for the FTGL library.
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*
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* Specific font classes are derived from this class. It uses the helper
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* classes FTFace and FTSize to access the Freetype library. This class
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* is abstract and deriving classes must implement the protected
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* <code>MakeGlyph</code> function to create glyphs of the
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* appropriate type.
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*
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* It is good practice after using these functions to test the error
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* code returned. <code>FT_Error Error()</code>. Check the freetype file fterrdef.h
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* for error definitions.
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*
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* @see FTFace
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* @see FTSize
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* @see FTGlyphContainer
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* @see FTGlyph
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*/
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class FTGL_EXPORT FTFont
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{
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public:
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/**
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* Open and read a font file. Sets Error flag.
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*
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* @param fontFilePath font file path.
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*/
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FTFont( const char* fontFilePath);
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/**
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* Open and read a font from a buffer in memory. Sets Error flag.
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* The buffer is owned by the client and is NOT copied by FTGL. The
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* pointer must be valid while using FTGL.
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*
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* @param pBufferBytes the in-memory buffer
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* @param bufferSizeInBytes the length of the buffer in bytes
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*/
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FTFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes);
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/**
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* Destructor
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*/
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virtual ~FTFont();
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/**
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* Attach auxilliary file to font e.g font metrics.
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*
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* Note: not all font formats implement this function.
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*
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* @param fontFilePath auxilliary font file path.
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* @return <code>true</code> if file has been attached
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* successfully.
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*/
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bool Attach( const char* fontFilePath);
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/**
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* Attach auxilliary data to font e.g font metrics, from memory
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*
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* Note: not all font formats implement this function.
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*
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* @param pBufferBytes the in-memory buffer
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* @param bufferSizeInBytes the length of the buffer in bytes
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* @return <code>true</code> if file has been attached
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* successfully.
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*/
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bool Attach( const unsigned char *pBufferBytes, size_t bufferSizeInBytes);
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/**
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* Set the character map for the face.
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*
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* @param encoding Freetype enumerate for char map code.
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* @return <code>true</code> if charmap was valid and
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* set correctly
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*/
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bool CharMap( FT_Encoding encoding );
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/**
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* Get the number of character maps in this face.
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*
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* @return character map count.
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*/
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unsigned int CharMapCount();
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/**
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* Get a list of character maps in this face.
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*
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* @return pointer to the first encoding.
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*/
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FT_Encoding* CharMapList();
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/**
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* Set the char size for the current face.
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*
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* @param size the face size in points (1/72 inch)
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* @param res the resolution of the target device.
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* @return <code>true</code> if size was set correctly
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*/
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virtual bool FaceSize( const unsigned int size, const unsigned int res = 72);
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/**
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* Get the current face size in points.
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*
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* @return face size
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*/
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unsigned int FaceSize() const;
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/**
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* Set the extrusion distance for the font. Only implemented by
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* FTGLExtrdFont
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*
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* @param depth The extrusion distance.
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*/
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virtual void Depth( float depth){}
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/**
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* Enable or disable the use of Display Lists inside FTGL
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*
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* @param useList <code>true</code> turns ON display lists.
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* <code>false</code> turns OFF display lists.
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*/
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void UseDisplayList( bool useList);
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/**
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* Get the global ascender height for the face.
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*
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* @return Ascender height
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*/
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float Ascender() const;
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/**
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* Gets the global descender height for the face.
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*
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* @return Descender height
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*/
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float Descender() const;
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/**
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* Gets the line spacing for the font.
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*
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* @return Line height
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*/
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float LineHeight() const;
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/**
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* Get the bounding box for a string.
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*
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* @param string a char string
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* @param llx lower left near x coord
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* @param lly lower left near y coord
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* @param llz lower left near z coord
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* @param urx upper right far x coord
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* @param ury upper right far y coord
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* @param urz upper right far z coord
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*/
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void BBox( const char* string, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz);
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/**
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* Get the bounding box for a string.
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*
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* @param string a wchar_t string
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* @param llx lower left near x coord
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* @param lly lower left near y coord
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* @param llz lower left near z coord
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* @param urx upper right far x coord
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* @param ury upper right far y coord
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* @param urz upper right far z coord
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*/
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void BBox( const wchar_t* string, float& llx, float& lly, float& llz, float& urx, float& ury, float& urz);
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/**
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* Get the advance width for a string.
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*
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* @param string a wchar_t string
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* @return advance width
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*/
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float Advance( const wchar_t* string);
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/**
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* Get the advance width for a string.
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*
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* @param string a char string
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* @return advance width
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*/
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float Advance( const char* string);
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/**
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* Render a string of characters
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*
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* @param string 'C' style string to be output.
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*/
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virtual void Render( const char* string );
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/**
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* Render a string of characters
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*
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* @param string wchar_t string to be output.
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*/
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virtual void Render( const wchar_t* string );
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/**
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* Queries the Font for errors.
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*
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* @return The current error code.
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*/
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FT_Error Error() const { return err;}
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protected:
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/**
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* Construct a glyph of the correct type.
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*
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* Clients must overide the function and return their specialised
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* FTGlyph.
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*
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* @param g The glyph index NOT the char code.
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* @return An FT****Glyph or <code>null</code> on failure.
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*/
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virtual FTGlyph* MakeGlyph( unsigned int g) = 0;
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/**
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* Current face object
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*/
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FTFace face;
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/**
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* Current size object
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*/
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FTSize charSize;
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/**
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* Flag to enable or disable the use of Display Lists inside FTGL
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* <code>true</code> turns ON display lists.
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* <code>false</code> turns OFF display lists.
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*/
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bool useDisplayLists;
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/**
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* Current error code. Zero means no error.
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*/
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FT_Error err;
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private:
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/**
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* Check that the glyph at <code>chr</code> exist. If not load it.
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*
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* @param chr character index
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* @return <code>true</code> if the glyph can be created.
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*/
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inline bool CheckGlyph( const unsigned int chr);
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/**
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* An object that holds a list of glyphs
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*/
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FTGlyphContainer* glyphList;
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/**
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* Current pen or cursor position;
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*/
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FTPoint pen;
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};
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#endif // __FTFont__
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