Main Page | File List | File Members

FTPixmapGlyph.cpp

Go to the documentation of this file.
00001 #include    "FTPixmapGlyph.h"
00002 
00003 FTPixmapGlyph::FTPixmapGlyph( FT_Glyph glyph)
00004 :   FTGlyph( glyph),
00005     destWidth(0),
00006     destHeight(0),
00007     data(0)
00008 {
00009     // This function will always fail if the glyph's format isn't scalable????
00010     err = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_normal, 0, 1);
00011     if( err || ft_glyph_format_bitmap != glyph->format)
00012     {
00013         return;
00014     }
00015 
00016     FT_BitmapGlyph  bitmap = (FT_BitmapGlyph)glyph;
00017     FT_Bitmap*      source = &bitmap->bitmap;
00018 
00019     //check the pixel mode
00020     //ft_pixel_mode_grays
00021         
00022     int srcWidth = source->width;
00023     int srcHeight = source->rows;
00024     
00025    // FIXME What about dest alignment?
00026     destWidth = srcWidth;
00027     destHeight = srcHeight;
00028     
00029     if( destWidth && destHeight)
00030     {
00031         data = new unsigned char[destWidth * destHeight * 4];
00032     
00033         // Get the current glColor.
00034         float ftglColour[4];
00035         glGetFloatv( GL_CURRENT_COLOR, ftglColour);
00036 
00037         unsigned char redComponent =   static_cast<unsigned char>( ftglColour[0] * 255.0f);
00038         unsigned char greenComponent = static_cast<unsigned char>( ftglColour[1] * 255.0f);
00039         unsigned char blueComponent =  static_cast<unsigned char>( ftglColour[2] * 255.0f);
00040 
00041         unsigned char* src = source->buffer;
00042 
00043         unsigned char* dest = data + ((destHeight - 1) * destWidth) * 4;
00044         size_t destStep = destWidth * 4 * 2;
00045 
00046         if( ftglColour[3] == 1.0f)
00047         {
00048             for( int y = 0; y < srcHeight; ++y)
00049             {
00050                 for( int x = 0; x < srcWidth; ++x)
00051                 {
00052                     *dest++ = redComponent;
00053                     *dest++ = greenComponent;
00054                     *dest++ = blueComponent;
00055                     *dest++ = *src++;
00056                 }
00057                 dest -= destStep;
00058             }
00059         }
00060         else
00061         {
00062             for( int y = 0; y < srcHeight; ++y)
00063             {
00064                 for( int x = 0; x < srcWidth; ++x)
00065                 {
00066                     *dest++ = redComponent;
00067                     *dest++ = greenComponent;
00068                     *dest++ = blueComponent;
00069                     *dest++ = static_cast<unsigned char>(ftglColour[3] * *src++);
00070                 }
00071                 dest -= destStep;
00072             }
00073         }
00074 
00075         destHeight = srcHeight;
00076     }
00077 
00078     pos.x = bitmap->left;
00079     pos.y = srcHeight - bitmap->top;
00080     
00081     // Is this the right place to do this?
00082     FT_Done_Glyph( glyph );
00083 }
00084 
00085 
00086 FTPixmapGlyph::~FTPixmapGlyph()
00087 {
00088     delete [] data;
00089 }
00090 
00091 
00092 float FTPixmapGlyph::Render( const FTPoint& pen)
00093 {
00094     if( data)
00095     {
00096         // Move the glyph origin
00097         glBitmap( 0, 0, 0.0f, 0.0f, pen.x + pos.x, pen.y - pos.y, (const GLubyte*)0);
00098 
00099         glPixelStorei( GL_UNPACK_ROW_LENGTH, 0);
00100 
00101         glDrawPixels( destWidth, destHeight, GL_RGBA, GL_UNSIGNED_BYTE, (const GLvoid*)data);
00102         
00103         // Restore the glyph origin
00104         glBitmap( 0, 0, 0.0f, 0.0f, -pen.x - pos.x, -pen.y + pos.y, (const GLubyte*)0);
00105     }
00106 
00107     return advance;
00108 }

Generated on Mon Mar 8 18:45:41 2004 for FTGL by doxygen 1.3.5