


How Can I Speed Up Bitmap Manipulation in C# Beyond `SetPixel` and `GetPixel`?
Optimizing C# Bitmap Manipulation: Alternatives to Slow SetPixel
and GetPixel
Introduction
The built-in GetPixel
and SetPixel
methods in C# for bitmap manipulation are notoriously slow, especially when dealing with larger images. This article presents superior alternatives for significantly enhanced performance.
High-Performance Alternatives
Three primary methods offer substantial speed improvements over the standard functions:
-
DirectBitmap Class: This custom class provides direct, unmanaged access to bitmap data, eliminating the overhead of locking and copying. It offers
GetPixel
andSetPixel
methods for intuitive pixel manipulation. -
LockBits Method: This built-in method locks a section of the bitmap in memory for direct access to its raw data. While faster than
SetPixel
/GetPixel
, it requires explicit locking and unlocking, introducing a small performance cost. -
Unsafe Code Blocks: This approach utilizes unsafe pointers for direct memory manipulation. While potentially the fastest, it demands careful handling to prevent memory corruption; this method is best suited for experienced developers.
Performance Benchmarks
Performance varies depending on image size and the specific operation. Generally, DirectBitmap
surpasses LockBits
and dramatically outperforms SetPixel
/GetPixel
for larger bitmaps. The following table illustrates the performance differences:
Method | 4x4 | 16x16 | 64x64 | 256x256 | 1024x1024 | 4096x4096 |
---|---|---|---|---|---|---|
DirectBitmap | 2 | 28 | 668 | 8219 | 178639 | |
LockBits | 2 | 3 | 33 | 670 | 9612 | 197115 |
SetPixel | 45 | 371 | 5920 | 97477 | 1563171 | 25811013 |
Code Sample: DirectBitmap
The DirectBitmap
class simplifies pixel access:
public void SetPixel(int x, int y, Color colour) public Color GetPixel(int x, int y)
Usage example:
var dbm = new DirectBitmap(width, height); dbm.SetPixel(x, y, Color.Red); Color c = dbm.GetPixel(x, y);
Conclusion
For optimal performance with large bitmaps, the DirectBitmap
class provides a compelling solution, offering significant speed improvements over traditional methods. LockBits
presents a balanced compromise between speed and ease of use, while unsafe code, though potentially fastest, demands careful implementation.
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