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FastPixel - A much faster alternative to Bitmap.SetPixel

, 15 Aug 2006
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Ever wanted something faster than SetPixel? Well, you've found it.

Sample Image - screenShot.jpg

Introduction

I have been working on some graphics code lately, and have been quite irritated with SetPixel and its performance overheads. There is an alternative though: lock the bitmap and interact directly with an array of bytes each representing R, G, or B (and sometimes A, depending on whether it's an alpha bitmap or not).

Usage

Dim fp As New FastPixel(image)
fp.Lock()
fp.SetPixel(x, y, Color.Green)
fp.Unlock(True)

What I've learnt

  • Using Bitmap.Width or Bitmap.Height during an intense operation is very slow, because GdipGetImageWidth (or GdipGetImageHeight) is used to retrieve the value, and it isn't cached.
  • Using this class introduces speeds over 20 times faster than using SetPixel, on average.

Conclusion

Use the class!

Sorry about the length of this article, but there isn't much to explain. It's quite basic, and I just wanted to get it out there so people could use it :>

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

AndrewVos
Software Developer
United Kingdom United Kingdom
No Biography provided

Comments and Discussions

 
GeneralVery usefull piece of code Pinmembernmajor21-Apr-08 23:26 
QuestionWould like to use Fast Pixel but...why do I get this error? Pinmemberled1-Apr-08 12:23 
GeneralGreat code... but there may be an issue PinmemberStimphy17-Jan-07 8:36 
GeneralCounterpart code in MFC/GDI... [modified] PinmemberJun Du6-Jan-07 2:28 
GeneralA C# code translation of this utility Pinmemberratamoa19-Oct-06 10:43 
GeneralRe: A C# code translation of this utility PinstaffChristian Graus19-Oct-06 10:55 
GeneralRe: A C# code translation of this utility PinmemberAndrewVos19-Oct-06 23:31 
GeneralRe: A C# code translation of this utility PinmemberAndrewVos19-Oct-06 23:40 
Question1 bit conversion? Pinmemberbeckerben23-Aug-06 2:59 
AnswerRe: 1 bit conversion? [modified] PinmemberAlex@UEA24-Aug-06 0:04 
GeneralRe: 1 bit conversion? PinmemberAlex@UEA24-Aug-06 0:19 
GeneralRe: 1 bit conversion? Pinmemberbeckerben24-Aug-06 2:00 
GeneralRe: 1 bit conversion? PinmemberAlex@UEA24-Aug-06 3:43 
GeneralCorrection [modified] PinmemberAlex Fr16-Aug-06 3:55 
GeneralRe: Correction PinmemberAndrewVos16-Aug-06 6:01 
GeneralRe: Correction PinmemberAlex Fr16-Aug-06 6:32 
GeneralEasy of use Pinmembernorm .net15-Aug-06 23:17 
GeneralRe: Easy of use PinmemberAndrewVos16-Aug-06 0:25 
GeneralRe: Ease of use PinmemberDustin Metzgar16-Aug-06 2:46 
GeneralRe: Ease of use Pinmemberanomaly25-Oct-06 20:06 
GeneralRe: Easy of use Pinmemberaxelriet16-Aug-06 0:46 
GeneralRe: Easy of use Pinmembernorm .net16-Aug-06 0:54 

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