gls_unicode_font_base.h

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/*! \file
  \brief  The disti::GlsUnicodeFontBase class and related classes.

  \par Copyright Information

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*/
#ifndef _GLS_UNICODE_FONT_BASE_H
#define _GLS_UNICODE_FONT_BASE_H

#include "gls_font_base.h"

namespace disti
{
// forward ref
class GlsUnicodeFontDBUFReader;

//===========================================================================
/**
* The GlsUnicodeFontBase class provides a specific unicode font face for use within the GL 
* Studio.  The font face is determined at construction time by the 
* parameters passed in by the creator of the GlsFontBase instance.  Specific
* instances should be wrapped in a singelton object wrapper, as there is
* no reason to have more than one instance of the exact same face (meaning
* font family, style, and point size.)
*
* Once instanced, a GlsFontRenderer object can be used to render characters in
* Open GL at specific locations and with several different text effects.
* 
* \sa GlsFontRenderer
*/
//===========================================================================
class GlsUnicodeFontBase : public GlsFontBase
{
public:
    /** char index associated with absent glyph */
    static const unsigned short NO_GLYPH;

    //-----------------------------------------------------------------------
    /// Attributes of the specific font
    //-----------------------------------------------------------------------
    struct FontAttrUnicode_t : public FontAttr_t
    {
        unsigned int numberOfTextures;            /** the number of textures used to generate font */
        unsigned int glyphCount;                  /** the number of glyphs rendered for the font */
        unsigned int maxNumberOfGlyphsPerTexture; /** The maximum number of glyphs per texture for the first n textures.
                                                      This does not take into consideration the last texture which
                                                      may contain less than the standard number of glyphs per
                                                      texture */

        /** Default constructor to initialize font data to known values */
        FontAttrUnicode_t()
            : numberOfTextures( 1 )
            , glyphCount( 0 )
            , maxNumberOfGlyphsPerTexture( 1 )
        {
        }
    };

    //-----------------------------------------------------------------------
    /// Character attributes. One item for each character in the set.
    //-----------------------------------------------------------------------
    struct CharAttrUnicode_t : public CharAttr_t
    {
        unsigned int textureIndex; /**< Index of the texture that contains the glyph */
        unsigned int glyphIndex;   /**< Index of the glyph. This is needed since glyphs are not assumed to be contiguous */

        /** Default constructor to initialize character attribute data to known values */
        CharAttrUnicode_t()
            : textureIndex( 0 )
            , glyphIndex( 0 )
        {
        }

        CharAttrUnicode_t(
            GLfloat      w,
            GLfloat      h,
            GLfloat      vTexX1,
            GLfloat      vTexX2,
            GLfloat      fTexX1,
            GLfloat      fTexX2,
            GLfloat      vTexY1,
            GLfloat      vTexY2,
            GLfloat      fTexY1,
            GLfloat      fTexY2,
            GLfloat      horiBearingX_,
            GLfloat      horiBearingY_,
            GLfloat      horiAdvance_,
            GLfloat      vertBearingX_,
            GLfloat      vertBearingY_,
            GLfloat      vertAdvance_,
            unsigned int textureIndex_,
            unsigned int glyphIndex_ )
            : CharAttr_t( w, h, vTexX1, vTexX2, fTexX1, fTexX2, vTexY1, vTexY2, fTexY1, fTexY2,
                  horiBearingX_, horiBearingY_, horiAdvance_, vertBearingX_, vertBearingY_, vertAdvance_ )
            , textureIndex( textureIndex_ )
            , glyphIndex( glyphIndex_ )
        {
        }
    };

    typedef std::vector<CharAttrUnicode_t> AttrContUnicode_t;

    typedef std::vector<Image*> ImageVector_t;

    /** Class Constructor
      * \param dbufReader reader to read BUF data from
      */
    GLS_EXPORT GlsUnicodeFontBase( GlsUnicodeFontDBUFReader& dbufReader );

    /** Determine if font was instantiated correctly
      * \return true if valid else false
      */
    GLS_EXPORT bool IsValid( void ) const;

    /** get the font textures associated with the unicode font
      * \return the font textures associated with the unicode font
      */
    GLS_EXPORT ImageVector_t FontTextures( void ) const;

    /** get the unicode character attribute for the given char
      * \param c The character to retrieve attributes for.
      * \returns The attributes for the character else char attributes for first character
      *         in font if char is not in range for this font
      */
    GLS_EXPORT const CharAttrUnicode_t& CharAttrUnicode( Char_t c ) const;

    /** Get the font texture for the font texture containing the given glyph
      * \param c The character to retrieve attributes for.
      * \return the font texture for the font texture containing the given glyph,
      *         else font texture for first glyph in font if glyph is not in the font
      */
    GLS_EXPORT Image* FontTextureForChar( Char_t c ) const;

protected:
    /** 
    * Class Destructor. This is protected so that no one can delete a font
    * except via the font manager GlsFontMan.
    * It is not vitual because we want to avoid calling destructors on unloaded font code, 
    * and it is not needed.
    */
    GLS_EXPORT ~GlsUnicodeFontBase();

    friend class GlsFontMan;

    FontAttrUnicode_t _fontAttrUnicode; /**< unicode font attributes */
    AttrContUnicode_t _charAttrUnicode; /**< unicode char attributes */
    ImageVector_t     _fontTextures;    /**< font textures */
    bool              _isValid;         /**< true if font is valid else false */

    unsigned int    _charAttributeIndexLUTSize; /**< number of entries in the _charAttributeIndexLUT = ( lastChar - firstChar ) + 1 ) */
    unsigned short* _charAttributeIndexLUT;     /**< look up table from glyph index ( minus _fontAttributes.firstChar )
                                                     * to _charAttrUnicode array index else entry has NO_GLYPH to indicate that the given
                                                     * glyph is not in the font ( NOTE : array is _charAttributeIndexLUT long ) */

private:
    //-----------------------------------------------------------------------
    // Prevent copies
    //-----------------------------------------------------------------------
    GlsUnicodeFontBase( const GlsUnicodeFontBase& );
    GlsUnicodeFontBase& operator=( const GlsUnicodeFontBase& );

}; // end class GlsUnicodeFontBase

/** helper class for reading a binary unicode font (DBUF) */
class GlsUnicodeFontDBUFReader
{
public:
    /** ctor -- construct from inline data (optionally compressed)
      * \param inlineDBUFData inline DBUF data to read
      * \param lineLength length of lines in inline data
      * \param totalInlineSize total number of bytes (not including NULL terminators) of inline data
      * \param isCompressed true if dbuf data is zlib compressed else false
      * \param uncompressedSize uncompressed size of data if isCompressed else ignored
      */
    GLS_EXPORT GlsUnicodeFontDBUFReader( const unsigned char* const* inlineDBUFData, const unsigned int lineLength,
        const unsigned int totalInlineSize, const bool isCompressed, unsigned long uncompressedSize );

    /** ctor -- construct from noninline data (not compressed)
      * \param dbufData DBUF data to read
      * \param dbufDataLength number of bytes of data in dbufData
      */
    GLS_EXPORT GlsUnicodeFontDBUFReader( const unsigned char* const dbufData, const unsigned int dbufDataLength );

    /** dtor */
    GLS_EXPORT ~GlsUnicodeFontDBUFReader();

    /** Get the GlsFontBase::FontAttr_t associated with the unicode font
      * \return the GlsFontBase::FontAttr_t associated with the unicode font
      */
    GLS_EXPORT GlsFontBase::FontAttr_t GetGlsFontBaseFontAttributes( void );

    /** Get the GlsFontBase::AttrCont_t associated with the unicode font
      * \return the GlsFontBase::AttrCont_t associated with the unicode font
      */
    GLS_EXPORT GlsFontBase::AttrCont_t GetGlsFontBaseCharAttributes( void );

    /** Get the first image associated with the unicode font (suitable for use by GlsFontBase)
      * \return the first image associated with the unicode font (suitable for use by GlsFontBase)
      * \note will increase usage count on texture by one so caller should call DeleteUsage when texture is no longer needed
      */
    GLS_EXPORT Image* GetGlsFontBaseTexture( void );

    /** Get the GlsUnicodeFontBase::FontAttrUnicode_t associated with the unicode font
      * \return the GlsFontBase::FontAttrUnicode_t associated with the unicode font
      */
    GLS_EXPORT GlsUnicodeFontBase::FontAttrUnicode_t GetGlsUnicodeFontBaseFontAttributes( void );

    /** Get the GlsUnicodeFontBase::AttrContUnicode_t associated with the unicode font
      * \return the GlsFontBase::AttrContUnicode_t associated with the unicode font
      */
    GLS_EXPORT GlsUnicodeFontBase::AttrContUnicode_t GetGlsUnicodeFontBaseCharAttributes( void );

    /** Get the textures associated with the unicode font
      * \return the textures associated with the unicode font
      * \note each texture will have its usage count increased by one so caller should call DeleteUsage on each texture
      *       when they are no longer needed
      */
    GLS_EXPORT std::vector<Image*> GetGlsUnicodeFontBaseTextures( void );

    /** Determine if a valid DBUF was read
      * \return true if a valid DBUF was read else false
      */
    GLS_EXPORT bool IsValid( void ) const;

    /** Get an error message if !IsValid()
      * \return an error message if !IsValid()
      */
    GLS_EXPORT std::string GetErrorMsg( void ) const;

protected:
    /** initialize the reader from the given DBUF data
      * \param dbufData DBUF data to read
      * \param dbufDataLength number of bytes of data in dbufData
      */
    GLS_EXPORT void InitializeFromDBUF( const unsigned char* const dbufData, const unsigned int dbufDataLength );

    bool        _isValid; /**< true if a valid DBUF was read else false */
    std::string _errMsg;  /**< error message if !IsValid() */

    GlsUnicodeFontBase::FontAttrUnicode_t _fontAttrUnicode; /**< unicode font attributes read from DBUF data */
    GlsUnicodeFontBase::AttrContUnicode_t _charAttrUnicode; /**< unicode char attributes read from DBUF data */
    std::vector<Image*>                   _fontTextures;    /**< font textures read from DBUF data */

private:
    //-----------------------------------------------------------------------
    // Prevent copies
    //-----------------------------------------------------------------------
    GlsUnicodeFontDBUFReader( const GlsUnicodeFontDBUFReader& src );
    GlsUnicodeFontDBUFReader& operator=( const GlsUnicodeFontDBUFReader& ths );
};

} // end namespace disti

#endif