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How Can I Optimize Bitmap-to-BitmapSource Conversion in WPF for High Frame Rates?
How Can I Optimize Bitmap-to-BitmapSource Conversion in WPF for High Frame Rates?
Jan 11, 2025 am 11:02 AM
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:
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;
}
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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