AlbedoDatabaseGenerator.Database.Entry.GenerateThumbnail C# (CSharp) Метод

            public unsafe void GenerateThumbnail( bool _ForceRegenerate )
            {
                if ( m_Thumbnail != null && !_ForceRegenerate )
                    return;	// Already generated

                if ( m_Manifest == null )
                    throw new Exception( "Invalid manifest to load textures from!" );

                // Attempt to load an existing thumbnail
                FileInfo	FileName = ThumbnailFileName;
                if ( FileName.Exists )
                {
                    if ( !_ForceRegenerate )
                    {	// It does!
                        m_Thumbnail = Bitmap.FromFile( FileName.FullName ) as Bitmap;
                        return;
                    }

                    // Erase existing thumbnail
                    if ( m_Thumbnail != null )
                        m_Thumbnail.Dispose();

                    FileName.Delete();
                }

                // Make sure the textures are ready
                m_Manifest.LoadTextures();

                Bitmap		Source = m_Manifest.m_Texture;
                BitmapData	LockedBitmap = Source.LockBits( new Rectangle( 0, 0, Source.Width, Source.Height ), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb );

                int			TargetHeight = THUMBNAIL_WIDTH * Source.Height / Source.Width;
                Bitmap		Target = new Bitmap( THUMBNAIL_WIDTH, TargetHeight, PixelFormat.Format32bppArgb );
                BitmapData	LockedBitmap2 = Target.LockBits( new Rectangle( 0, 0, Target.Width, Target.Height ), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb );

                for ( int Y=0; Y < TargetHeight; Y++ )
                {
                    byte*	pScanlineSource = (byte*) LockedBitmap.Scan0.ToPointer() + (Y * Source.Height / TargetHeight) * LockedBitmap.Stride;
                    byte*	pScanlineTarget = (byte*) LockedBitmap2.Scan0.ToPointer() + Y * LockedBitmap2.Stride;
                    for ( int X=0; X < THUMBNAIL_WIDTH; X++ )
                    {
                        byte*	pPixelSource = pScanlineSource + (X * Source.Width / THUMBNAIL_WIDTH) * 4;
                        *pScanlineTarget++ = *pPixelSource++;
                        *pScanlineTarget++ = *pPixelSource++;
                        *pScanlineTarget++ = *pPixelSource++;
                        *pScanlineTarget++ = *pPixelSource++;
                    }
                }

                Target.UnlockBits( LockedBitmap2 );
                Source.UnlockBits( LockedBitmap );

                // We have a new thumbnail!
                m_Thumbnail = Target;
                m_Thumbnail.Save( FileName.FullName, ImageFormat.Jpeg );
                m_Thumbnail.Dispose();
                m_Thumbnail = null;
            }