Solved

Inline bitmap, Data URL and RLE compressed data in JavaScript

Posted on 2007-04-11
8
486 Views
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.
0
Comment
Question by:gzjimfan
  • 4
  • 2
8 Comments
 
LVL 5

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.
0
 
LVL 5

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! :)
0
How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

 

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..
0
 
LVL 5

Expert Comment

by:NickVd
ID: 18893599
image magick (though I'm not 100% on the language)
0
 
LVL 5

Accepted Solution

by:
NickVd earned 500 total points
ID: 18893604
Sorry, thought I linked... http://www.imagemagick.org/script/index.php
0

Featured Post

Threat Intelligence Starter Resources

Integrating threat intelligence can be challenging, and not all companies are ready. These resources can help you build awareness and prepare for defense.

Join & Write a Comment

Preface This article introduces an authentication and authorization system for a website.  It is understood by the author and the project contributors that there is no such thing as a "one size fits all" system.  That being said, there is a certa‚Ķ
SASS allows you to treat your CSS code in a more OOP way. Let's have a look on how you can structure your code in order for it to be easily maintained and reused.
The viewer will learn how to count occurrences of each item in an array.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now