WPF, Image Control, bitmap 수정 및 업데이트하기

 

# xaml 

<Grid Background="Black">         <Image x:Name="DrawCanvas" Width="100" Height="100"/>     </Grid>

 

# 비트맵 변경

public void init(int w, int h)         {             DrawCanvas.Width = w;             DrawCanvas.Height = h;         }         public void DrawColorCanvas2(int x, int y, int color)         {             int bitmapWidth = (int)DrawCanvas.Width;             int bitmapHeight = (int)DrawCanvas.Height;             if (_writeableBitmap == null)             {                 _writeableBitmap = new WriteableBitmap(bitmapWidth, bitmapHeight, 96, 96, PixelFormats.Bgra32, null);                 int length = _writeableBitmap.BackBufferStride * bitmapHeight;                 byte[] buffer = new byte[length];                 _writeableBitmap.WritePixels(new Int32Rect(0, 0, (int)_writeableBitmap.Width, (int)_writeableBitmap.Height), buffer, _writeableBitmap.BackBufferStride, 0);                 DrawCanvas.Source = _writeableBitmap;             }             try             {                 // Reserve the back buffer for updates.                 _writeableBitmap.Lock();                 // Compute the pixel's color.                 int color_data = 0;                 color_data |= color << 0;   // B                 color_data |= color << 8;   // G                 color_data |= color << 16;  // R                 color_data |= 0xff << 24;   // A                  unsafe                 {                     int length = _writeableBitmap.BackBufferStride * bitmapHeight;                     //for (int y = 0; y < bitmapHeight; y++)                     {                         //for (int x = 0; x < bitmapWidth; x++)                         {                             int i = (y * _writeableBitmap.BackBufferStride) + (x * 4);                             IntPtr pBackBuffer = _writeableBitmap.BackBuffer;                             // Find the address of the pixel to draw.                             pBackBuffer += y * _writeableBitmap.BackBufferStride;                             pBackBuffer += x * 4;                             // Assign the color data to the pixel.                             *((int*)pBackBuffer) = color_data;                         }                     }                 }                 // Specify the area of the bitmap that changed.                 _writeableBitmap.AddDirtyRect(new Int32Rect(x, y, 1, 1));             }             finally             {                 // Release the back buffer and make it available for display.                 _writeableBitmap.Unlock();             }         }

 

# 테스트

public void Test()         {             int bitmapWidth = (int)DrawCanvas.Width;             int bitmapHeight = (int)DrawCanvas.Height;             for (int y = 0; y < bitmapHeight; y++)             {                 for (int x = 0; x < bitmapWidth; x++)                 {                     DrawColorCanvas2(x, y, 0, false);                 }             }             // 화면 업데이트             System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke(                             System.Windows.Threading.DispatcherPriority.Background                            , new System.Threading.ThreadStart(delegate { }));         }