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Inline bitmap, Data URL and RLE compressed data in JavaScript

Posted on 2007-04-11
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Last Modified: 2013-11-19
Hi experts,

I have a RLE compressed bitmap encoded in base64, and I would like to use inline bitmap (data URL) to display this picture in FireFox. It looks like fire fox can't display my bitmap, does anyone know why?

My code that displays the bitmap is:

function display(base64str)
{
   var pic = document.createElement('img');
   pic.src = 'data:image/bmp;base64,' + base64str;
  var div = document.getElementById("mydiv");
  div.appendChild(pic);
}

I tried with none RLE compressed bitmap and it works fine.  So I am wondering if RLE is even supported in data URL kind of usage.
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Question by:gzjimfan
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Expert Comment

by:NickVd
ID: 18893250
Is there reason why you're using a bmp file instead of a gif or a jpeg?

Try data:image/gif;base64 or data:image/jpeg;base64 instead of data:image/bmp;base64

Also, make sure than your encoded string is not corrupt.
0
 

Author Comment

by:gzjimfan
ID: 18893364
The target I am working on is running on an embedded platform which does not support bitmap to jpeg/gif compression (or I would have to port code to do that), that's why I am using RLE to do it because it's much simpler. I think the base64 encoded data is OK because using the same code to encode the none-RLE compressed data can get a proper picture display.

If there's no other way to display encoded RLE bitmap I will need to look into solutions to compress jpeg images on the embedded platform.

Thanks for your response.
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Expert Comment

by:NickVd
ID: 18893431
Ah..

Well since you're on an embedded system, I don't know how much help I can be other than suggesting you talk with the manufacturer.

Good luck! :)
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Author Comment

by:gzjimfan
ID: 18893450
:) I am the manufacturer (designer that develops the embedded device).

If you know a free piece of source code that compresses JPEG from bitmap in C/C++, please let me know..
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Expert Comment

by:NickVd
ID: 18893599
image magick (though I'm not 100% on the language)
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Accepted Solution

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NickVd earned 500 total points
ID: 18893604
Sorry, thought I linked... http://www.imagemagick.org/script/index.php
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