How Can I Optimize Bitmap-to-BitmapSource Conversion in WPF for High Frame Rates?

Boosting WPF Bitmap-to-BitmapSource Conversion for Smooth High-Frame-Rate Image Display

Maintaining smooth image display on WPF's Image control at high refresh rates (e.g., 30Hz) necessitates efficient conversion from System.Drawing.Bitmap to System.Windows.Media.Imaging.BitmapSource. The common CreateBitmapSourceFromHBitmap method can be computationally expensive, leading to high CPU usage and impacting performance.

Enhanced Conversion for Improved Performance

For superior performance, a more direct approach is recommended. This involves locking the bitmap's bits and directly accessing its pixel data. Precise specification of the PixelFormat during conversion further enhances speed. The following code exemplifies this optimized method:

<code class="language-csharp">public static BitmapSource Convert(System.Drawing.Bitmap bitmap)
{
    var bitmapData = bitmap.LockBits(
        new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height),
        System.Drawing.Imaging.ImageLockMode.ReadOnly, bitmap.PixelFormat);

    var bitmapSource = BitmapSource.Create(
        bitmapData.Width, bitmapData.Height,
        bitmap.HorizontalResolution, bitmap.VerticalResolution,
        PixelFormats.Bgr24, null,
        bitmapData.Scan0, bitmapData.Stride * bitmapData.Height, bitmapData.Stride);

    bitmap.UnlockBits(bitmapData);

    return bitmapSource;
}</code>

This optimized conversion typically achieves speeds at least four times faster than CreateBitmapSourceFromHBitmap.

Achieving 30Hz and Beyond: Holistic Optimization

While this improved conversion significantly reduces CPU load, reaching and sustaining 30Hz (or higher) might demand further application-level optimizations. Image size, processing stages, and hardware limitations all play a role. Thorough application profiling to pinpoint bottlenecks is crucial for maximizing performance at high frame rates.

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