FTFont.cxx

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#include    "FTFace.h"
#include    "FTFont.h"
#include    "FTGlyphContainer.h"
#include    "FTBBox.h"


FTFont::FTFont( const char* fontFilePath)
:   face( fontFilePath),
    useDisplayLists(true),
    preRenderCalled(false),
    glyphList(0)
{
    err = face.Error();
    if( err == 0)
    {
        glyphList = new FTGlyphContainer( &face);
    }
}


FTFont::FTFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes)
:   face( pBufferBytes, bufferSizeInBytes),
    glyphList(0)
{
    err = face.Error();
    if( err == 0)
    {
        glyphList = new FTGlyphContainer( &face);
    }
}


FTFont::~FTFont()
{
    delete glyphList;
}


bool FTFont::Attach( const char* fontFilePath)
{
    if( face.Attach( fontFilePath))
    {
        err = 0;
        return true;
    }
    else
    {
        err = face.Error();
        return false;
    }
}


bool FTFont::Attach( const unsigned char *pBufferBytes, size_t bufferSizeInBytes)
{
    if( face.Attach( pBufferBytes, bufferSizeInBytes))
    {
        err = 0;
        return true;
    }
    else
    {
        err = face.Error();
        return false;
    }
}


bool FTFont::FaceSize( const unsigned int size, const unsigned int res )
{
    charSize = face.Size( size, res);
    err = face.Error();
    
    if( err != 0)
    {
        return false;
    }
    
    if( glyphList != NULL)
    {
        delete glyphList;
    }
    
    glyphList = new FTGlyphContainer( &face);
    return true;
}


unsigned int FTFont::FaceSize() const
{
    return charSize.CharSize();
}


bool FTFont::CharMap( FT_Encoding encoding)
{
    bool result = glyphList->CharMap( encoding);
    err = glyphList->Error();
    return result;
}


unsigned int FTFont::CharMapCount()
{
    return face.CharMapCount();
}


FT_Encoding* FTFont::CharMapList()
{
    return face.CharMapList();
}


void FTFont::UseDisplayList( bool useList)
{
    useDisplayLists = useList;
}

float FTFont::Ascender() const
{
    return charSize.Ascender();
}


float FTFont::Descender() const
{
    return charSize.Descender();
}

float FTFont::LineHeight() const
{
    return charSize.Height();
}

void FTFont::BBox( const char* string,
                   float& llx, float& lly, float& llz, float& urx, float& ury, float& urz)
{
    FTBBox totalBBox;

    if((NULL != string) && ('\0' != *string))
    {
        const unsigned char* c = (unsigned char*)string;
        float advance = 0;

        if(CheckGlyph( *c))
        {
            totalBBox = glyphList->BBox( *c);
            advance = glyphList->Advance( *c, *(c + 1));
        }
                
        while( *++c)
        {
            if(CheckGlyph( *c))
            {
                FTBBox tempBBox = glyphList->BBox( *c);
                tempBBox.Move( FTPoint( advance, 0.0f, 0.0f));
                totalBBox += tempBBox;
                advance += glyphList->Advance( *c, *(c + 1));
            }
        }
    }

    llx = totalBBox.lowerX;
    lly = totalBBox.lowerY;
    llz = totalBBox.lowerZ;
    urx = totalBBox.upperX;
    ury = totalBBox.upperY;
    urz = totalBBox.upperZ;
}


void FTFont::BBox( const wchar_t* string,
                   float& llx, float& lly, float& llz, float& urx, float& ury, float& urz)
{
    FTBBox totalBBox;

    if((NULL != string) && ('\0' != *string))
    {
        const wchar_t* c = string;
        float advance = 0;

        if(CheckGlyph( *c))
        {
            totalBBox = glyphList->BBox( *c);
            advance = glyphList->Advance( *c, *(c + 1));
        }
        
        while( *++c)
        {
            if(CheckGlyph( *c))
            {
                FTBBox tempBBox = glyphList->BBox( *c);
                tempBBox.Move( FTPoint( advance, 0.0f, 0.0f));
                totalBBox += tempBBox;
                advance += glyphList->Advance( *c, *(c + 1));
            }
        }
    }

    llx = totalBBox.lowerX;
    lly = totalBBox.lowerY;
    llz = totalBBox.lowerZ;
    urx = totalBBox.upperX;
    ury = totalBBox.upperY;
    urz = totalBBox.upperZ;
}


float FTFont::Advance( const wchar_t* string)
{
    const wchar_t* c = string;
    float width = 0.0f;

    while( *c)
    {
        if(CheckGlyph( *c))
        {
            width += glyphList->Advance( *c, *(c + 1));
        }
        ++c;
    }
    
    return width;
}


float FTFont::Advance( const char* string)
{
    const unsigned char* c = (unsigned char*)string;
    float width = 0.0f;

    while( *c)
    {
        if(CheckGlyph( *c))
        {
            width += glyphList->Advance( *c, *(c + 1));
        }
        ++c;
    }
    
    return width;
}


void FTFont::Render( const char* string )
{
    bool pre_post = ! preRenderCalled;
    if (pre_post) PreRender();

    const unsigned char* c = (unsigned char*)string;
    pen.X(0); pen.Y(0);

    while( *c)
    {
        if(CheckGlyph( *c))
        {
            pen = glyphList->Render( *c, *(c + 1), pen);
        }
        ++c;
    }

    if (pre_post) PostRender();
}


void FTFont::Render( const char* string, float w_max, float w_fade )
{
    bool pre_post = ! preRenderCalled;
    if (pre_post) PreRender();

    float col[4];
    glGetFloatv(GL_CURRENT_COLOR, col);
    float alpha_fac = col[3] / (w_max - w_fade);
    float w = 0;

    const unsigned char* c = (unsigned char*)string;
    pen.X(0); pen.Y(0);

    while( *c)
    {
        if(CheckGlyph( *c))
        {
            pen = glyphList->Render( *c, *(c + 1), pen);
            w += pen.X();
            if(w > w_max)
                break;
            if(w > w_fade)
            {
                col[3] = alpha_fac * (w_max - w);
                glColor4fv(col);
            }
        }
        ++c;
    }

    if (pre_post) PostRender();
}


void FTFont::Render( const wchar_t* string )
{
    bool pre_post = ! preRenderCalled;
    if (pre_post) PreRender();

    const wchar_t* c = string;
    pen.X(0); pen.Y(0);

    while( *c)
    {
        if(CheckGlyph( *c))
        {
            pen = glyphList->Render( *c, *(c + 1), pen);
        }
        ++c;
    }

    if (pre_post) PostRender();
}


bool FTFont::CheckGlyph( const unsigned int characterCode)
{
    if( NULL == glyphList->Glyph( characterCode))
    {
        unsigned int glyphIndex = glyphList->FontIndex( characterCode);
        FTGlyph* tempGlyph = MakeGlyph( glyphIndex);
        if( NULL == tempGlyph)
        {
            if( 0 == err)
            {
                err = 0x13;
            }
            
            return false;
        }
        glyphList->Add( tempGlyph, characterCode);
    }
    
    return true;
}

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