PixelFarm.DrawingGL.GLBitmap.Dispose C# (CSharp) Method

        public override void Dispose()
        {
            GL.DeleteTextures(1, ref textureId);
        }

 public void DrawString(char[] text, int startAt, int len, double x, double y)
 {
     if (this.UseSubPixelRendering)
     {
         //1. clear prev drawing result
         _aggPainter.Clear(Drawing.Color.FromArgb(0, 0, 0, 0));
         //aggPainter.Clear(Drawing.Color.White);
         //aggPainter.Clear(Drawing.Color.FromArgb(0, 0, 0, 0));
         //2. print text span into Agg Canvas
         textPrinter.DrawString(text, startAt, len, 0, 0);
         //3.copy to gl bitmap
         byte[] buffer = PixelFarm.Agg.ActualImage.GetBuffer(actualImage);
         //------------------------------------------------------
         GLBitmap glBmp = new GLBitmap(bmpWidth, bmpHeight, buffer, true);
         glBmp.IsInvert = false;
         //TODO: review font height
         canvas.DrawGlyphImageWithSubPixelRenderingTechnique(glBmp, (float)x, (float)y + 40);
         glBmp.Dispose();
     }
     else
     {
         //1. clear prev drawing result
         _aggPainter.Clear(Drawing.Color.FromArgb(0, 0, 0, 0));
         //2. print text span into Agg Canvas
         textPrinter.DrawString(text, startAt, len, 0, 0);
         //3.copy to gl bitmap
         byte[] buffer = PixelFarm.Agg.ActualImage.GetBuffer(actualImage);
         //------------------------------------------------------
         GLBitmap glBmp = new GLBitmap(bmpWidth, bmpHeight, buffer, true);
         glBmp.IsInvert = false;
         //TODO: review font height
         canvas.DrawGlyphImage(glBmp, (float)x, (float)y + 40);
         glBmp.Dispose();
     }
 }