/// <summary>
/// Setup constructor
/// </summary>
/// <param name="fontData">Font data</param>
public OpenGlFont( FontData fontData )
{
m_RenderState = Graphics.Factory.CreateRenderState( );
m_RenderState.DepthTest = false;
m_RenderState.Blend = true;
m_RenderState.SourceBlend = BlendFactor.SrcAlpha;
m_RenderState.DestinationBlend = BlendFactor.OneMinusSrcAlpha;
m_RenderState.FaceRenderMode = PolygonRenderMode.Fill;
m_RenderState.Enable2dTextures = true;
m_RenderState.Lighting = false;
Setup( fontData.Font, fontData.Characters );
}
/// <summary>
/// Builds this font from a System.Drawing.Font object
/// </summary>
/// <param name="font">Font to build from</param>
/// <param name="characters">Set of characters to build the font texture from</param>
/// <returns>Returns this</returns>
public void Setup( Font font, FontData.CharacterSet characters )
{
Bitmap img = BuildFontImage( font, characters );
img.Save( string.Format( "{0}{1}.png", font.Name, font.Size ), ImageFormat.Png );
m_FontTextureSampler = Graphics.Factory.CreateTexture2dSampler( );
m_FontTextureSampler.Texture = Graphics.Factory.CreateTexture2d( );
m_FontTextureSampler.Texture.Create( img, false );
m_FontTextureSampler.Mode = TextureMode.Modulate;
m_FontTextureSampler.MinFilter = TextureFilter.NearestTexel;
m_FontTextureSampler.MagFilter = TextureFilter.NearestTexel;
}
/// <summary>
/// Builds an image from this font
/// </summary>
private Bitmap BuildFontImage( Font font, FontData.CharacterSet characterSet )
{
string chars = new string( characterSet.Chars );
System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage( new Bitmap( 1, 1 ) );
Size charSetSize = MeasureString( graphics, chars, font );
graphics.Dispose( );
m_MaxHeight = charSetSize.Height;
// HACK: Add a fair bit of padding to width and height when calculating required area
int area = ( charSetSize.Width + 1 ) * ( charSetSize.Height + 1 );
int size = 128;
for ( ; ( size * size ) < area; size *= 2 ) { }
// Set up new image and graphics object to render to it
Bitmap img = new Bitmap( size, size, PixelFormat.Format32bppArgb );
graphics = System.Drawing.Graphics.FromImage( img );
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
StringFormat format = new StringFormat( StringFormatFlags.FitBlackBox );
format.Alignment = StringAlignment.Near;
int x = 0;
int y = 0;
for ( int charIndex = 0; charIndex < chars.Length; ++charIndex )
{
string charStr = chars.Substring( charIndex, 1 );
SizeF charSize = graphics.MeasureString( charStr, font );
int charWidth = ( int )charSize.Width;
if ( ( x + charWidth ) >= size )
{
x = 0;
y += ( charSetSize.Height );
}
if ( chars[ charIndex ] < 256 )
{
int xPadding = ( int )( font.Size / 3 );
int yPadding = 0;
m_CharacterData[ chars[ charIndex ] ] = new CharacterData
(
checked( ( short )( x + xPadding ) ),
checked( ( short )( y + yPadding ) ),
checked( ( byte )( charSize.Width - xPadding * 2 ) ),
checked( ( byte )( charSize.Height - yPadding * 2 ) )
);
}
else
{
throw new ApplicationException( "not handling non-ascii characters yet, sorry" );
}
graphics.DrawString( charStr, font, Brushes.White, x, y, format );
x += charWidth;
}
graphics.Dispose( );
FillBmpAlpha( img );
return img;
}
