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RLE (Run-Length-Encoding) compression routine in MFC for 256 color bitmap

By , 9 Dec 2002
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Sample Image - RLEBmp.gif

Introduction

This is a RLE compression routine written in MFC. I wrote this because I could not find handy code for such thing.

RLE compression is useful when saving SIMPLE Windows bitmap. Especially my implementation is rather stupid and not optimized. Therefore, if the source bitmap is complex (like the one in the demo app window shown above), you could even get a bigger bitmap file after compression. Smile | :)

The compression routine is wrapped in an MFC bitmap control class, CDVDBitmapControl, which you can put in a dialog conveniently. The usage is easy:

  1. Add a static control (say IDC_STATIC_BITMAP) in the dialog for the bitmap control
  2. Add a #include "DVDBitmapControl.h" in the header file of your dialog
  3. Add a member variable (say m_bmp) of type CDVDBitmapControl in your dialog class.
  4. In OnInitDialog(), add this line: m_bmp.SubclassDlgItem( IDC_STATIC_BITMAP, this);
  5. Call m_bmp.LoadBitmapFile(CString) to load bitmap into control
  6. Call m_bmp.SaveBitmapFile(CString) to save bitmap into 8-bit RLE bitmap

If you need only the compression code, you can extract the CDVDBitmapControl::CompressInRLE8() and CDVDBitmapControl::EndOfLine() routines from DVDBitmapControl.cpp. It is quite straight forward to use them (with some substitutions for bitmap width, bitmap height in code).

I did not write the decompression part because Windows API LoadImage() already does it.

PS: in the demo app, if the loaded bitmap is not in 256 color, [Save] will not work.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Seth Chou

Taiwan Taiwan
No Biography provided

Comments and Discussions

 
QuestionWorks when nothing else does PinmemberRikTheVeggie2-Nov-11 5:48 
Generali need a code source for rle Pinmemberivanny30-Nov-06 5:04 
GeneralRe: i need a code source for rle Pinmemberindrauday10-Apr-09 22:51 
GeneralHelp!!! PinmemberLerka14-Jan-04 8:56 
GeneralRe: Help!!! Pinmemberycl9-Mar-04 18:10 
GeneralAVI RLE compressors PinmemberJohn Ulvr6-Mar-03 11:32 
GeneralPack them in PNG instead PinsussKochise10-Dec-02 22:23 
GeneralA template-based version Pinmembercompiler10-Dec-02 9:28 
GeneralBe careful! PinsussAnonymous10-Dec-02 2:35 
GeneralRe: Be careful! PinmemberSeth Chou11-Dec-02 2:11 
GeneralRe: Be careful! PinsussKochise11-Dec-02 6:22 
GeneralRe: Be careful! PinsussKochise13-Dec-02 0:06 
Generala problem for every student Pinmembermarc12310-Dec-02 1:21 

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