How Can I Speed Up Bitmap to BitmapSource Conversion in WPF for a More Fluent UI?

Optimizing Bitmap to BitmapSource Conversion for Responsive WPF UIs

Frequent image updates in WPF applications demand efficient Bitmap to BitmapSource conversion. The standard CreateBitmapSourceFromHBitmap method often introduces considerable CPU overhead.

Performance Issues with the Standard Approach

The performance bottleneck stems from CreateBitmapSourceFromHBitmap's multi-step process: creating an intermediate HBitmap, copying pixel data, and finally converting to a BitmapSource. Each step contributes to significant performance penalties.

A Superior Conversion Technique

A more efficient solution utilizes the Convert method, bypassing the performance-draining steps of the standard approach. This method operates as follows:

The Convert method:

1. Bitmap Locking: Secures exclusive access to the Bitmap's pixel data.
2. BitmapSource Creation: Directly creates a BitmapSource from the locked pixel data.
3. Pixel Format Matching: Ensures the BitmapSource's PixelFormat aligns with the Bitmap's PixelFormat.
4. Bitmap Unlocking: Releases the lock on the Bitmap, allowing other processes to access it.

By eliminating the intermediate HBitmap and associated data copying, Convert offers substantial performance gains.

Implementing the Optimized Method

To integrate this improved method, simply replace your existing conversion code with:

<code class="language-csharp">var bitmapSource = System.Windows.Media.Imaging.Convert(bmp);</code>

Summary

Employing the Convert method significantly reduces CPU usage during frequent Bitmap to BitmapSource conversions. This optimization leads to a more responsive and fluid user experience in your WPF application.

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