How Can I Speed Up Bitmap to BitmapSource Conversion in WPF for Efficient Image Display?

Optimizing Bitmap to BitmapSource Conversion in WPF for Smooth Image Display

Problem:

WPF applications displaying images at 30Hz using CreateBitmapSourceFromHBitmap often experience high CPU usage (around 80%), impacting performance. This is due to the inherent slowness of the conversion process.

Root Cause:

The CreateBitmapSourceFromHBitmap method is inefficient for high-frequency image updates.

Improved Solution:

A significantly faster approach involves direct memory access and explicit PixelFormat specification:

<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 method directly accesses the bitmap's pixel data, specifying the PixelFormats.Bgr24 format, thereby bypassing the performance bottleneck of CreateBitmapSourceFromHBitmap and resulting in substantial CPU usage reduction, ensuring smoother image display at the desired frame rate.

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